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Quick Start & FAQ

Recently we have seen a large increase in the amount of geospacial data that is being published using RDF and Linked Data principles. Efforts such as the W3C Geo XG, and most recently the GeoSPARQL initiative are providing the necessary vocabularies to publish this kind of information on the Web of Data. map4rdf is a mapping and faceted browsing tool for exploring and visualizing RDF datasets enhanced with geometrical Information.

map4rdf is an open source software. Just configure it to use your SPARQL endpoint and provide your users with a nice map-based visualization of your data. The geospatial aspects of the data can be modelled using either the data model from W3C Geo XG or the geometrical data model proposed by GeoLinkedData

map4rdf provides:

Initial Display

Once you have installed map4rdf, you can see the initial display

Switching layers

Click on the plus sign on the right side of the map.

The application will show the available layers you have. Select one of them.

Selecting Facets

Select a particular facet

The application will show only the resources of the facet selected

Filtering

This is a new feature of map4rdf. It allows us to filter the resources to visualize.

Click on the pencil icon to turn on the drawing mode.

Select the area of the map you want to see resources

If you want to remove the filter click on remove filter button.

Finally click on the pencil icon to turn off the drawing mode.

Suggestion of Editions

You can suggest editions of a given resource. For example, let us assume that the resource that represents the Murcia Airport has not the correct information.

First, you have to click on the resource, and a dialog will appear.

Next, you have to click on "To Edit, click here". Then, you will see the edition page that shows the resource and its properties. You can collapse the properties and suggest changes for the properties/values. When you finish you can click on "save button", and the modifications will store in a file on the server file system.

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The general configuration parameters of map4rdf are defined within the configuration.properties file. The configuration of the faceted browser is defined by the facets.ttl file.

configuration.properties

This file is located within map4rdf's webapp directory, at /WEB-INF/configuration.properties

Configuration file example

endpoint.url=http://dbpedia.org/sparql

geometry.model=DBPEDIA

ui.google_maps_api_key=ABQIAAAAzLYqFkZVLHv0seO36vhZahTVXfBc-erLsJZtZLx-fZLjxiIMWBTUgr5s9aY_jQ5Fyqku0qQKuoGE8A

facets.automactic=true

edit_depth=3

rdf_store_path=/home/user/code/tmp/rdf/

Structure of the configuration file:

1. endpoint.url
The URL of your SPARQL endpoint.

2. geometry.model
This specify the data model used within your data. Two possible options: 3. ui.google_maps_api_key
The Google Maps API Key for your website. If you are only accessing map4rdf from localhost you don't need to provide a key.

4. facet.automatic
This is set to true if you want map4rdf to automatically discover facets on you dataset. Otherwise, this functionality can be turned off by setting this property to false.

5. edit_dept
The depth of the editable tree. The value show us how deep information can be edited by user

6. rdf_store_path
The path to the directory where edited files will be stored

facets.ttl

This file is writen in turtle syntaxt and it is located within map4rdf's webapp directory, at /WEB-INF/facets.ttl

facet.ttl file examples

FacetGroup example:
 @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
 @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
 @prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
 @prefix foaf: <http://xmlns.com/foaf/0.1/> .
 @prefix map4rdf: <http://code.google.com/p/map4rdf/wiki/ontology#> .

_:rdfTypeFacet 
	a map4rdf:FacetGroup;
	map4rdf:facetPredicate rdf:type;
	rdfs:label "Type"@en;
	rdfs:label "Tipo"@es;
.
The example above only defines a FacetGroup for the predicate rdf:type if the configuration file defines facets.automactic=true this group will be poculated automatic with all the possible types for geo-referenciable resources. At least one FacetGroup must be defined on this file.
Manually defined facets example:
 @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
 @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
 @prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
 @prefix foaf: <http://xmlns.com/foaf/0.1/> .
 @prefix map4rdf: <http://code.google.com/p/map4rdf/wiki/ontology#> .

_:rdfTypeFacet 
	a map4rdf:FacetGroup;
	map4rdf:facetPredicate rdf:type;
	rdfs:label "Type"@en;
	rdfs:label "Tipo"@es;
	map4rdf:facet <http://dbpedia.org/ontology/Person>;
	map4rdf:facet <http://dbpedia.org/ontology/University>;
.

<http://dbpedia.org/ontology/Person>
	rdfs:label "Person"@en;
	rdfs:label "Persona"@es;
.

<http://dbpedia.org/ontology/University>
	rdfs:label "University"@en;
	rdfs:label "Universidad"@es;
.
The example above manually defines two facets for the the FacetGroup. The facet Person and the facet University. When the facets are manually defined you want to turn off the automatic facet detection by setting facets.automactic=false in the configuration file.