[auscope-geosciml] GeoSciML Thematic View schema - call for feedback

Alistair Ritchie alistair.bh.ritchie at gmail.com
Tue Sep 14 21:43:02 EDT 2010


*BACKGROUND*

The lack of a thematic map or portrayal model that could be easily deployed
in the current generation of web map services (be they OGC or Google or ...
? ... services) has long been recognised as a problem in GeoSciML. At the
Rome IWG meeting the group moved to develop a schema that defined GeoSciML
compatible map layers for simple map services (meeting
note<https://www.seegrid.csiro.au/twiki/bin/view/CGIModel/RomeF2FModelDesignMeetingNotes#14_Portrayal_classes_in_GeoSciML>,
TWiki overview<https://www.seegrid.csiro.au/twiki/bin/view/CGIModel/GeoSciMLThematicView>
). Broadly speaking the intent is to promote:

   1. a consistent interface to web map data;
   2. the widespread us of controlled vocabularies in thematic mapping;
   3. the ability to share thematic mapping tools such as SLDs between map
   services and clients to allow simple map query and display use cases ('show
   me all units coloured by their lithology', ' show me all units that contain
   sandstone');
   4. provide a very simple entry level to the GeoSciML world, introducing
   the concepts of mapping to community defined vocabularies and understanding
   the full GeoSciML model.

The primary result of this work will be a GML application schema that
conforms to level 0 of the Simple Features Profile for GML (SF). It is a
denormalised *view* of GeoSciML that corresponds to a GIS layer (one record
per geometry) and can be used for portrayal and thematic mapping purposes.

While it has been harmonized with GeoSciML (consistent naming conventions,
broad mapping of properties) it is a schema in it own right. It  not a SF
level 0 profile of GeoSciML, is not intended as a basis for setting up
simple GeoSciML Web Feature Services, and is not intended as a simple query
interface to GeoSciML. It is solely for representing geological features in
simple map clients using simple map services.


*REQUEST FOR COMMENT*

An initial skeleton of a model has been compiled based on existing WMS
layers (GeoScience Victoria and Arizona Geological Survey) and feedback from
participants at the Rome meeting. Tables summarising the proposed layers
have been posted here:

https://www.seegrid.csiro.au/twiki/bin/view/CGIModel/GeoSciMLThematicViewModelDiscussion

We need feedback from a much broader group and invite interested parties to
comment on the model and suggest changes where necessary. At the end of
October a release candidate schema will be produced and tested as part of
Testbed 4.

We look forward to your feedback.

Thanks

*Alistair Ritchie*
*GEOSCIENCE VICTORIA* | EARTH RESOURCES DIVISION
Department of Primary Industries | Melbourne, Victoria, Australia
*Tel:* +61 3 9658 4512 | *Fax*: +61 3 9658 4555
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