Difference between revisions of "Dataset Tutorial"

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This page describes a tutorial for using the Linked Earth wiki. The tutorial is structured in an incremental way, getting more complex as you progress. There are four main levels of difficulty, which allow you to perform different tasks in the Linked Earth wiki:
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This tutorial is meant to get you started with uploading and editing a dataset onto the LinkedEarth platform.  
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*Trivial level: how request an account and log in the wiki.
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*Basic annotation level: how to upload LiPD datasets and update basic metadata fields.
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*Advanced annotation level: how to create and reuse properties for annotation, including cases like dataset location annotation.
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*Advanced wiki functionality: create and edit wiki pages, special pages and uploading materials (pdfs, images).
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Finally, we list a set of best practices for creating wiki materials.
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After completing this tutorial, you will be able to:
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* Upload LiPD datasets and enter basic metadata for the record.
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*Annotate a dataset: Create and reuse properties for annotation.
  
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= Trivial level =
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When annotating a dataset, the LinkedEarth wiki follows some '''nomenclature rules''' that you can find on [[Best Practices | this page]].
  
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== Getting a Linked Earth wiki account ==
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= LiPD and LinkedEarth =
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To get an account in the Linked Earth wiki, fill in [http://linked.earth/?wpgform_qv=1002 the membership form].
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==Logging in the Wiki ==
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The [[LinkedEarth Ontology]] represents the backbone of the wiki. The ontology allows us to not only define terms commonly used to describe a paleoclimate dataset (e.g., variable, uncertainty, calibration) but also specify the relationship among these terms (e.g., a variable has uncertainty). As such, it allows us to make inferences, support complex queries, as well as perform quality control on the data. '''Remember that no formal knowledge about ontologies is required to use and contribute to the wiki!'''
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To log in, just click on the link at top right of the wiki and insert your user/password. Figure 1 indicates where the log in option is located with more detail.
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[[File:TutorialFig1.png|thumb|none|500px|Figure1: Log in form]]
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The LinkedEarth ontology was developed from the [[Linked Paleo Data]] (LiPD) format championed by Nick McKay and Julien Emile-Geay. Therefore, the wiki platform is currently optimized to accept data already in this format. To convert you dataset into a LiPD file, follow [[Creating a LiPD file | this guide]].
  
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= Basic annotation level =
 
 
== Uploading a LiPD file ==
 
== Uploading a LiPD file ==
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After logging in, use this link to update a LiPD file: [http://wiki.linked.earth/Special:WTLiPD http://wiki.linked.earth/Special:WTLiPD], a special page for managing datasets already in the LiPD format.
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You need to be '''logged in''' to upload a LiPD file, using this [[Special:WTLiPD | special page]] dedicated to the management of datasets already in the LiPD format. This page can be access directly from the left sidebar: [[Special:WTLiPD | Managing LiPD files]].  
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Select the browse button and choose the .lpd file you want to upload as shown in Figure 2:
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[[File:TutorialFig2.png|thumb|none|1000px|Figure2: Manage LiPD Data page]]
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Select the browse button and choose the .lpd file you want to upload as shown in Figure 1:
  
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The page will be created and your dataset will appear on the "Current LiPD Dataset list". By clicking on the dataset link, you will be able to see the automatically extracted metadata from the LiPD file, as shown in Figure 3.
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[[File:TutorialFig2.png|thumb|none|1000px|Figure1: Manage LiPD Data page]]
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Dataset pages will be automatically created from the content of the LiPD file and your dataset will appear at the top of the "Current LiPD Dataset list" on the [[Main Page]]. By clicking on the dataset link, you will be able to see the automatically extracted data and metadata from the LiPD file, as shown in Figure 2. New "crowd" properties will be automatically created from the LiPD file if these properties are not in the current ontology.  
  
 
[[File:TutorialFigure3.png|thumb|none|1000px|Figure2: Wiki page created automatically from the metadata of the LiPD dataset]]
 
[[File:TutorialFigure3.png|thumb|none|1000px|Figure2: Wiki page created automatically from the metadata of the LiPD dataset]]
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Congratulations! Your LiPD file has been successfully added to the Linked Earth wiki.
 
Congratulations! Your LiPD file has been successfully added to the Linked Earth wiki.
  
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'''Exercise: upload your own LiPD file through the "manage dataset" page in the wiki.'''
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== Annotating a LiPD file ==
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Once a LiPD file is uploaded, the metadata about that file is shown in a table-like manner on the page with two columns. The column on the left of each table contains the properties describing the LiPD file, while the column on the right states the value associated with each property. Figure 3 shows an example, where the "archive type" of CAN9Neukom2014 is "Tree". You can also click on the property to access its definition in the [[LinkedEarth Ontology]]. Properties followed by (L) indicates that they are part of the [[Linked Paleo Data | LiPD architecture]] and, therefore, cannot be directly edited by basic editors of the LinkedEarth community.  
  
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== Annotation of a LiPD file ==
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Please check that the metadata for your record is correct and edit it if appropriate. For instance, to add an investigator to the CAN9Neukom2014 dataset in Figure 2, click on its corresponding row as indicated in Figure 3. Then type the value of the property. In this example, we added "Daniel" as the investigator.
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Once a LiPD file is uploaded, the metadata about that file is shown in a table with two columns. The column on the left of each table contains the properties describing the LiPD file, while the column on the right states the value associated with each property. Figure 3 shows an example, where the "archive type" of CAN9Neukom2014 is "Tree".
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Now that the metadata about the file is published, we have to review whether it is correct or not, and edit it if appropriate. For example, the first thing we notice for the CAN9Neukom2014 dataset in Figure 3 is that there are no investigators associated with the dataset. In order to edit a property value (whether existing or not defined) we have to click on its corresponding row as indicated in Figure 4. For instance, in Figure 4 we can add "Daniel" as an investigator.
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[[File:TutorialFig4.png|thumb|none|1000px|Figure 3: Editing a property value for a LiPD file]]
  
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[[File:TutorialFig4.png|thumb|none|1000px|Figure 4: Editing a property value for a LiPD file]]
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All annotated values can be edited or removed. To remove "Daniel" from the investigators of the example dataset, click on the row and on the red cross button of the left as shown in Figure 4:
  
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Each annotated values can be edited or removed. If we want to remove "Daniel" from the investigators of the dataset, click on the row and on the red cross button of the left as shown in Figure 5:
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[[File:TutorialFig5.png|thumb|none|800px|Figure 4: Deleting a property from a dataset]]
  
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[[File:TutorialFig5.png|thumb|none|800px|Figure 5: Deleting a property from a dataset]]
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Each property/property value added to the page is tracked on the page history. The page history is accessible through the "View history" button at the top of any wiki page, allowing to monitor the edits done by other wiki users. Figure 5 illustrates the edits for the CAN9Neukom 2014 dataset: the latest change added a propertyValue adding "Daniel" as an investigator.
  
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Each property added to the page is tracked on the page history. The page history is accessible through the "View history" button at the top of any wiki page (see Figure 1 for more details). This way, everyone can check the edits done by other collaborators. Figure 6 illustrates the edits done to the CAN9Neukom 2014 dataset: the latest change added a propertyValue adding "Daniel" as an investigator.
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Anyone with basic editor privileges and logged into the wiki can edit property values. Don't worry, all changes are revertible and you will get an automatic email if anyone changes a page in your watchlist.  
  
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[[File:TutorialFig6.png|thumb|none|800px|Figure 6: History of the edits done to the CAN9Neukon2014 dataset]]
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[[File:TutorialFig6.png|thumb|none|800px|Figure 5: History of the edits done to the CAN9Neukon2014 dataset]]
  
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If there is a disagreement between two researchers, a discussion may be started on the "Discussion" page, as depicted on Figure 7.
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If there is a disagreement between two researchers, a discussion may be started on the "Discussion" page, as depicted on Figure 6. To learn more about how to contribute and edit discussion pages, follow this [[Discussion Page Tutorial | tutorial]].
  
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[[File:TutorialFig7.png|thumb|none|600px|Figure 7: Creating a discussion page on CAN9Neukon2014 dataset]]
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[[File:TutorialFig7.png|thumb|none|600px|Figure 6: Creating a discussion page on CAN9Neukon2014 dataset]]
  
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Each contribution deserves credit. The wiki pages of the Linked Earth wiki track the authors who have contributed automatically. Figure 8 shows the "Credit" table, at the bottom of the wiki page.
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Contributions is tracked automatically on the wiki and displayed in the "Credit" section, which can be found at the bottom of each wiki page.  
  
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[[File:TutorialFig8.png|thumb|none|600px|Figure 8: credits of the CAN9Neukon2014 dataset]]
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[[File:TutorialFig8.png|thumb|none|600px|Figure 7: credits of the CAN9Neukon2014 dataset]]
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==Dataset versioning==
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An important detail to pay attention to is the version of the dataset. In LiPD all the uploaded datasets should follow a x.y.z notation, where "x" refers to important changes in the dataset's metadata (e.g., the creation of a new age model using a different code), "y" refers to changes to the data following a publication (e.g., adding data further back in time without changing the model underlying the interpretation) and z refers to minor changes not associated with a publication (e.g., typos). For example, the first official release of a dataset would be 1.0.0. If I fix a small typo, I would create version 1.0.1.
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'''Exercise: Annotate the version of the dataset in the recently created page, following the x.y.z notation and using the property "datasetVersion".'''
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== Concept annotation in a LiPD file ==
 
== Concept annotation in a LiPD file ==
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As shown in Figure 4 and Figure 5, some of the annotated values like "Tree" already have links to other pages.  These pages can be further populated and annotated by domain experts. For example, Figure 9 shows the Tree definition made in the Linked Earth wiki, which was created as a stub. Domain experts can contribute to the page, gathering field knowledge.
 
  
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By linking to other existing pages we can connect different LiPD datasets (e.g., if two different datasets are of the same archive type, they will link to the same page).  
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As shown in Figures 3 and 4, some of the annotated values like "Tree" already have links to other pages.  These pages can be further populated and edited by domain experts. To do so click on the Edit tab at the top of the page as shown on Figure 8 for the "Tree" archive. The article was created as a stub, awaiting domain experts' contribution, further gathering field knowledge.  
  
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When a link appears in red, it means that the page has not been defined yet. Anyone can click on these red links to associate a new page with its documentation. An example can be seen on Figure 10.
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To learn more about Wiki editing, visit the [[Quick Guide to Editing Wiki Pages]].
  
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[[File:TutorialFig9.png|thumb|none|700px|Figure 9: Tree concept definition on the Linked Earth wiki]]
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By linking to other existing pages we can connect different LiPD datasets (e.g., if two different datasets are of the same archive type, they will link to the same page) and support queries. For instance, one can look for all the datasets on the LinkedEarth wiki using "Tree" as archives. 
  
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[[File:TutorialFig10.png|thumb|none|700px|Figure 10: Creating a page for an unexisting concept (highlighted in red)]]
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Red links means that the page does not yet exist. Editors can create the new page and edit its content. An example can be seen on Figure 9.
  
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'''Exercise: edit the page "Tree ring width", which does not have a definition at the moment, and add a test definition. Use this link as the "Archive Type" value on your uploaded LiPD dataset .'''
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[[File:TutorialFig9.png|thumb|none|700px|Figure 8: Tree concept definition on the Linked Earth wiki]]
  
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=Advanced annotation level=
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[[File:TutorialFig10.png|thumb|none|700px|Figure 9: Creating a page for an unexisting concept (highlighted in red)]]
  
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== Property annotation in a LiPD file ==
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=Annotate a dataset=
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Until now we have covered how to annotate property values and associate them to concepts and existing pages in the wiki. In this next step we will see how to create new properties on our LiPD datasets, i.e., adding new annotations to our dataset outside of the standard properties shown in Figure 3.
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The "Properties" box, placed under the "Standard Properties" table, allows users to edit and create new properties and values. An example is shown in Figure 11. By clicking on the "plus" sign in the title, a new row will appear on the table. The row has two fields, one for adding the property name we want to use to describe the dataset (e.g., title, description, name, etc.) and another row for inserting the property value.
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== Property annotation ==
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Until now we have covered how to annotate property values and associate them to concepts and existing pages in the wiki. In this next step we will see how to create new properties to describe a dataset, i.e., adding new annotations to our dataset outside of the standard properties shown in Figure 2.
  
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[[File:TutorialFig11.png|thumb|none|600px|Figure 11: adding a property for the LiPD file in Figure 3]]
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The "Properties" box, placed under the "Standard Properties" table, allows users to edit and create new properties and values. An example is shown in Figure 10. By clicking on the "plus" sign in the title, a new row will appear on the table. The row has two fields, one for adding the property name we want to use to describe the dataset (e.g., title, description, name, etc.) and another row for inserting the property value.
  
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Before adding a new property name, it is important to note that a similar property may already exist in the ontology to describe the result as we aim to do. For example, imagine that we want to add a "description" to the dataset. If we start typing the property, we see that it already exists, and we can select it for our purposes. Selecting existing properties is important, as it helps to structure and control the content uploaded to the wiki.
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[[File:TutorialFig11.png|thumb|none|600px|Figure 10: adding a property for the LiPD file in Figure 3]]
  
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'''Exercise: create a "title" property and use it to annotate your uploaded dataset. Check if the property already exists. If it doesn't, create it.'''
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Before adding a new property name, it is important to note that a similar property may already exist in the ontology to describe the same metadata. '''The properties are case-sensitive.''' For instance, imagine that we want to add a "description" to the dataset. If we start typing the property, we see that it already exists, and we can select it for our purposes. Selecting existing properties is important, as it helps to structure and control the content uploaded to the wiki.
  
 
== Adding location to a dataset ==
 
== Adding location to a dataset ==
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One of the requirements for your dataset to appear in a map is to add the coordinates where it was located. For that, you need to follow three main steps, as illustrated on Figure 24. The first step consists on linking the location used to collect the data. Any location is valid, from a single point (e.g., the dataset was collected from point x,y of mountain z) to a polyline (e.g., a river), or even a polygon (e.g., a mountain, a city or even a country). In the example, we are linking the dataset to the location "Central Andes composite 9", where the data was collected.
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The LinkedEarth wiki automatically add a new dataset to an existing query page, such as the one on our [[Main Page]], provided that the dataset contains a set of coordinates. To do so, first link the location used to collect the data as illustrated on Figure 11. Any location is valid, from a single point (in a xyz coordinate systems) to a polyline (e.g., a river), or even a polygon (e.g., a mountain, a city or even a country). In the example, we are linking the dataset to the location "Central Andes composite 9", where the data was collected.
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Once the location page has been created (step 1), we can annotate its name and its associated geometry with the property "hasGeometry" (step2). This is represented in this way because a location may change over time (e.g., a river could change its course), and hence the geometry would change without affecting the location itself.
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Finally in step 3 we add the coordinates to the Geometry (if the page doesn't exist already). For this we use the AsWKT property, which indicates to the system that the coordinates are in Well Known Text format (https://en.wikipedia.org/wiki/Well-known_text). Since in this case we are representing a point, we also add type "Point" as property for the geometry.
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[[File:TutorialFig24.png|thumb|none|700px|Figure 24: Steps for adding location to your dataset.]]
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== Adding and extending concepts (e.g., how do I refer to the instrument used in my lab?) ==
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Sometimes one may want to extend some of the concepts that already exist in the wiki. For example, imagine that I have measured a variable of a table (d18Og.rub-w) with the stable isotope ratio mass spectrometer instrument of my lab. If I state that the variable d18Og.rub-w was measured by a "stable isotope mass spectrometer instrument" (under the "instrument" category) I would be losing information: are all stable isotope mass spectrometer instruments the same?
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We need to state which stable isotope mass spectrometer was used. In this case, the one at my lab.
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Hence, we need to create the concept "StableIsotopeRatioMassSpectrometerOfMyLab", a special type of "Instrument" that allows creating new annotations on the data. Following the example shown in the previous section, we would need to create the StableIsotopeRatioMassSpectrometerOfMyLab page and annotate it with the category "StableIsotopeRatioMassSpectrometer". This category would become a new category in the wiki.
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'''Exercise: Use an instrument of your lab to describe a variable from a dataset. If the category of your instrument does not exist, create a new instrument category (e.g., stable isotope mass spectrometer). '''
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=Advanced wiki functionality=
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== Creating a personal page ==
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The Linked Earth wiki allows to create different types of pages. Personal pages are a special type of wiki pages, and we will use them to illustrate how to create a new wiki page in general. After logging in on the wiki, click on your name. You can find it on the top of any wiki page, as shown in Figure 12:
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[[File:TutorialFig12.png|thumb|none|400px|Figure 12: location of the personal page for a user]]
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Clicking your name will take you to a new page, which you can complete with your personal information, by clicking on any of the "edit options" in the page, as depicted in Figure 13:
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[[File:TutoroialFig13.png|thumb|none|600px|Figure 13: editing personal information on your wiki page]]
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And adding your personal information on the form (Figure 14):
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[[File:TutorialFig14.png|thumb|none|500px|Figure 14: form to fill with the user information]]
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After you are done, just hit the "Update" button at the bottom of the page (Figure 15):
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[[File:TutorialFig15.png|thumb|none|400px|Figure 15: editing your personal page on the form.]]
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'''Exercise: Create your personal page and add a personal website and an "about me" description.'''
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== Creating a new wiki page ==
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Just go to [http://organicdatacuration.org/le-beta/index.php/New_Page http://organicdatacuration.org/le-beta/index.php/New_Page]
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Replace "New Page" above to the name that you want for the page.
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Then, either select a category for this page (Figure 16):
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[[File:TutorialFig16.png|thumb|none|300px|Figure 16: Selecting a category for a new page]]
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or, just click on the "Create" link to create a page without any category (Figure 17)
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[[File:TutorialFig17.png|thumb|none|200px|Figure 17: create page button, located on the bottom right of the page]]
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== Deleting an existing wiki page ==
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Go to [http://www.organicdatascience.org/index.php/Name_of_Page http://www.organicdatascience.org/index.php/Name_of_Page]
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Replace "Name of Page" above to the name of the page to delete, as shown in Figure 18.
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[[File:TutorialFig18.png|thumb|none|300px|Figure 18: Wiki page option menu]]
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Then click on the "Delete" link, and delete the page. Figure 19 shows an example:
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[[File:TutorialFig19.png|thumb|none|500px|Figure 19: Deleting menu]]
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== Searching existing wiki pages==
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Before creating any page, it is recommended to search if they exist. Searching a page can be done by entering the terms on the search bar located on the top right of any page (see Figure 20).
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[[File:TutorialFig20.png|thumb|none|500px|Figure 20: Search bar for finding existing wiki pages]]
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Any page containing the word introduced in the search bar will be returned.
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== Renaming wiki pages ==
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Wiki pages may need to be renamed. For example, due to typos in the page name or community agreement. In order to rename an existing page without losing any of its contents, you should click on the "Move" button under the "More" menu on the top of the page. An example is shown in Figure 21.
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[[File:TutorialFig21.png|thumb|none|500px|Figure 21: Moving an existing wiki page]]
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By clicking on the Move button, the page showed in Figure Figure 22 will ask for the new page name, as well as a reason of the change.
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[[File:TutorialFig22.png|thumb|none|700px|Figure 22: Moving a wiki page form.]]
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After hitting the "Move page" button, your page will be renamed.
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== Uploading images and files ==
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If you want to add an image or document to your a wiki page, you just have to click on the "upload files" button that can be seen on the left of any wiki page (see Figure 23).
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[[File:TutorialFig23.png|thumb|none|700px|Figure 23: uploading an image or document to the Linked Earth wiki.]]
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Once the location page has been created, we can annotate its name and its associated geometry with the property "hasGeometry". This property takes into account the fact that a location may change over time (e.g., a river could change its course), and hence the geometry would change without affecting the location itself.
  
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After you are done selecting the document you want to upload, just hit the "Upload file" button at the bottom of the page. Now you may reference to this file using brackets (e.g., [ [ File:File.png ] ]). You can see the different options for showing files in this page: [https://www.mediawiki.org/wiki/Help:Images https://www.mediawiki.org/wiki/Help:Images]
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Finally, we add the coordinates to the Geometry (if the page doesn't exist already). For this we use the AsWKT property, which indicates to the system that the coordinates are in the [https://en.wikipedia.org/wiki/Well-known_text Well Known Text format]. Since in this case we are representing a point, we also add type "Point" as property for the geometry.  
  
  
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[[File:TutorialFig24.png|thumb|none|700px|Figure 11: Steps for adding location to your dataset.]]
  
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= Best practices =
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== See Also ==
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This section will cover naming convntions for instances, publications or versions in a dataset. This is currently under discussion.
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TBD
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* [[Quick Guide to Editing Wiki Pages]]
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* [[Discussion Page Tutorial]]
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* [[Best Practices]]
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* [[Creating a LiPD file]]

Latest revision as of 22:32, 3 May 2017

This tutorial is meant to get you started with uploading and editing a dataset onto the LinkedEarth platform.

After completing this tutorial, you will be able to:

  • Upload LiPD datasets and enter basic metadata for the record.
  • Annotate a dataset: Create and reuse properties for annotation.

When annotating a dataset, the LinkedEarth wiki follows some nomenclature rules that you can find on this page.

LiPD and LinkedEarth

The LinkedEarth Ontology represents the backbone of the wiki. The ontology allows us to not only define terms commonly used to describe a paleoclimate dataset (e.g., variable, uncertainty, calibration) but also specify the relationship among these terms (e.g., a variable has uncertainty). As such, it allows us to make inferences, support complex queries, as well as perform quality control on the data. Remember that no formal knowledge about ontologies is required to use and contribute to the wiki!

The LinkedEarth ontology was developed from the Linked Paleo Data (LiPD) format championed by Nick McKay and Julien Emile-Geay. Therefore, the wiki platform is currently optimized to accept data already in this format. To convert you dataset into a LiPD file, follow this guide.

Uploading a LiPD file

You need to be logged in to upload a LiPD file, using this special page dedicated to the management of datasets already in the LiPD format. This page can be access directly from the left sidebar: Managing LiPD files.

Select the browse button and choose the .lpd file you want to upload as shown in Figure 1:

Figure1: Manage LiPD Data page

Dataset pages will be automatically created from the content of the LiPD file and your dataset will appear at the top of the "Current LiPD Dataset list" on the Main Page. By clicking on the dataset link, you will be able to see the automatically extracted data and metadata from the LiPD file, as shown in Figure 2. New "crowd" properties will be automatically created from the LiPD file if these properties are not in the current ontology.

Figure2: Wiki page created automatically from the metadata of the LiPD dataset

Congratulations! Your LiPD file has been successfully added to the Linked Earth wiki.

Annotating a LiPD file

Once a LiPD file is uploaded, the metadata about that file is shown in a table-like manner on the page with two columns. The column on the left of each table contains the properties describing the LiPD file, while the column on the right states the value associated with each property. Figure 3 shows an example, where the "archive type" of CAN9Neukom2014 is "Tree". You can also click on the property to access its definition in the LinkedEarth Ontology. Properties followed by (L) indicates that they are part of the LiPD architecture and, therefore, cannot be directly edited by basic editors of the LinkedEarth community.

Please check that the metadata for your record is correct and edit it if appropriate. For instance, to add an investigator to the CAN9Neukom2014 dataset in Figure 2, click on its corresponding row as indicated in Figure 3. Then type the value of the property. In this example, we added "Daniel" as the investigator.

Figure 3: Editing a property value for a LiPD file

All annotated values can be edited or removed. To remove "Daniel" from the investigators of the example dataset, click on the row and on the red cross button of the left as shown in Figure 4:

Figure 4: Deleting a property from a dataset

Each property/property value added to the page is tracked on the page history. The page history is accessible through the "View history" button at the top of any wiki page, allowing to monitor the edits done by other wiki users. Figure 5 illustrates the edits for the CAN9Neukom 2014 dataset: the latest change added a propertyValue adding "Daniel" as an investigator.

Anyone with basic editor privileges and logged into the wiki can edit property values. Don't worry, all changes are revertible and you will get an automatic email if anyone changes a page in your watchlist.

Figure 5: History of the edits done to the CAN9Neukon2014 dataset

If there is a disagreement between two researchers, a discussion may be started on the "Discussion" page, as depicted on Figure 6. To learn more about how to contribute and edit discussion pages, follow this tutorial.

Figure 6: Creating a discussion page on CAN9Neukon2014 dataset

Contributions is tracked automatically on the wiki and displayed in the "Credit" section, which can be found at the bottom of each wiki page.

Figure 7: credits of the CAN9Neukon2014 dataset

Concept annotation in a LiPD file

As shown in Figures 3 and 4, some of the annotated values like "Tree" already have links to other pages. These pages can be further populated and edited by domain experts. To do so click on the Edit tab at the top of the page as shown on Figure 8 for the "Tree" archive. The article was created as a stub, awaiting domain experts' contribution, further gathering field knowledge.

To learn more about Wiki editing, visit the Quick Guide to Editing Wiki Pages.

By linking to other existing pages we can connect different LiPD datasets (e.g., if two different datasets are of the same archive type, they will link to the same page) and support queries. For instance, one can look for all the datasets on the LinkedEarth wiki using "Tree" as archives.

Red links means that the page does not yet exist. Editors can create the new page and edit its content. An example can be seen on Figure 9.

Figure 8: Tree concept definition on the Linked Earth wiki
Figure 9: Creating a page for an unexisting concept (highlighted in red)

Annotate a dataset

Property annotation

Until now we have covered how to annotate property values and associate them to concepts and existing pages in the wiki. In this next step we will see how to create new properties to describe a dataset, i.e., adding new annotations to our dataset outside of the standard properties shown in Figure 2.

The "Properties" box, placed under the "Standard Properties" table, allows users to edit and create new properties and values. An example is shown in Figure 10. By clicking on the "plus" sign in the title, a new row will appear on the table. The row has two fields, one for adding the property name we want to use to describe the dataset (e.g., title, description, name, etc.) and another row for inserting the property value.

Figure 10: adding a property for the LiPD file in Figure 3

Before adding a new property name, it is important to note that a similar property may already exist in the ontology to describe the same metadata. The properties are case-sensitive. For instance, imagine that we want to add a "description" to the dataset. If we start typing the property, we see that it already exists, and we can select it for our purposes. Selecting existing properties is important, as it helps to structure and control the content uploaded to the wiki.

Adding location to a dataset

The LinkedEarth wiki automatically add a new dataset to an existing query page, such as the one on our Main Page, provided that the dataset contains a set of coordinates. To do so, first link the location used to collect the data as illustrated on Figure 11. Any location is valid, from a single point (in a xyz coordinate systems) to a polyline (e.g., a river), or even a polygon (e.g., a mountain, a city or even a country). In the example, we are linking the dataset to the location "Central Andes composite 9", where the data was collected.

Once the location page has been created, we can annotate its name and its associated geometry with the property "hasGeometry". This property takes into account the fact that a location may change over time (e.g., a river could change its course), and hence the geometry would change without affecting the location itself.

Finally, we add the coordinates to the Geometry (if the page doesn't exist already). For this we use the AsWKT property, which indicates to the system that the coordinates are in the Well Known Text format. Since in this case we are representing a point, we also add type "Point" as property for the geometry.


Figure 11: Steps for adding location to your dataset.

See Also

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