Support for INSPIRE GML in Quantum GIS

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Presentation transcript:

Support for INSPIRE GML in Quantum GIS Alexander Kotsev Christian Ansorge

Test case DK example AM dataset as input Custom schema (based on INSPIRE) AM dataset as input Flat structure Semantics from INSPIRE preserved No possibility to validate against AM schema

Convert GML to SqLite (OGR/GDAL) Approach Inflation/Unflattening of the DK example Mapping/Transformation in HALE Output validates against AM 2) Loading in QGIS GMLAS plugin Preserve INSPIRE GML content Load INSPIRE GML Convert GML to SqLite (OGR/GDAL) Visualize in QGIS

INSPIRE GML support in GDAL/OGR & QGIS INSPIRE - EEA and Copernicus actions 2016 INSPIRE GML support in GDAL/OGR & QGIS Support the development of QGIS plugin Consum complex feature GML as used for INSPIRE Copernicus funded activity Actors: Titellus, BRGM

INSPIRE - EEA and Copernicus actions 2016

INSPIRE - EEA and Copernicus actions 2016 Complex Feature XML conversion In a relational approach, the main problem is to convert from an XML flow of Complex Features instances to a relational database representation. The approach we followed consists in: analyzing the XSD schema(s) declared by the XML instance in order to retrieve the underlying object model and determine the type of each element and attribute as well as links between elements; converting links between elements into relations between database tables; inserting values in the database corresponding to the values found in the XML instance; generating a QGIS project configured to easily manipulate the relational model.

INSPIRE - EEA and Copernicus actions 2016 Sept. 16

INSPIRE GML support in GDAL/OGR & QGIS INSPIRE - EEA and Copernicus actions 2016 INSPIRE GML support in GDAL/OGR & QGIS Development of a new driver (GMLAS) in the GDAL library Demonstrate GDAL via a QGIS plugin Translating complex feature GML into a relational database structure Set keys and clean unused tables/structures Database structure depends on complexity of the source file Direct access to WFS or GML file

INSPIRE GML support in GDAL/OGR & QGIS INSPIRE - EEA and Copernicus actions 2016 INSPIRE GML support in GDAL/OGR & QGIS Documentation https://github.com/INSPIRE-MIF/gml_application_schema_toolbox/blob/master/README.md VirtualBox image for testing http://files.titellus.net/vbox/ Instruction videos Setting up the virtual box with QGIS3 & GML Application Schema toolbox plugin https://youtu.be/t9xAE12vLp0 QGIS GML Application Schema / INSPIRE Registry xlink resolution depending on language https://www.youtube.com/watch?v=EeAyyUOykVE

Results (demo)

Discussion Investment in (open) tools versus Modification of Models/Schemas SQLite/PostgreSQL storage Support for INSPIRE GML in other clients Reusability of OGR/GDAL ArcGIS for Desktop Web clients OpenLayers 3 LeafletJS