Advanced KML with GRASS GIS                                                                                               ...
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Advanced KML with GRASS GIS

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Globe-based earth browsers like GoogleEarth have turned web-based cartography into a widely accepted
commodity. This success is based on the three components: The browser software itself, remote sensing
data as a backdrop maps and thematic content layers.
From a GRASS GIS perspective, the ability to communicate thematic content via earth browsers is a
strategic means to quickly communicate findings to very large communities.
This poster describes the current options to compose such thematic content layers by using GRASS GIS:
Loosely coupled Keyhole Markup Language (KML) export functionalities provide the „glue“ for the seamless
integration between the GIS and the earth browser.

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Advanced KML with GRASS GIS

  1. 1. Advanced KML with GRASS GIS Peter Löwe RapidEye AG, Molkenmarkt 30, D 14476 Brandenburg a. d. Havel, Germany, Contact: loewe@rapideye.deMotivation Viewshed Analysis DemonstrationGlobe-based earth browsers like GoogleEarth have turned web-based cartography into a widely accepted Two alternative sites for digitalcommodity. This success is based on the three components: The browser software itself, remote sensing broadcast stations towers qredata as a backdrop maps and thematic content layers. assessed through polygon overlays (Odenwald Region, Germany).From a GRASS GIS perspective, the ability to communicate thematic content via earth browsers is a Red: Spatial coverage fromstrategic means to quickly communicate findings to very large communities. proposed primary site, Green (translucent): coverage fromThis poster describes the current options to compose such thematic content layers by using GRASS GIS: alternative site.Loosely coupled Keyhole Markup Language (KML) export functionalities provide the „glue“ for the seamless Green (opaque): Special interestintegration between the GIS and the earth browser. region. Source: P.Löwe 2010 GRASS-based KML Workflows Satellite Image Map Demonstration Green: GRASS modules Combined usage of of point, polygon and raster Red: Advanced KML layers in a KMZ created from an automated script: generation including layout. RapidEye satellite maps of the eastern Mississippi Grey: Standard KML Delta in RGB (left) and CIR (NIR-RedEdge-R, generation. right), including imagery metadata. Blue: Manually edited KML derivate from standard Source: RapidEye, 2010 workflowApproachGRASS GIS provides built-in support for KML export in a minimalistic way (v.out.ogr): Only vector data canbe exported in default coloring scheme.This results in a de-facto media break, since color-schemes can notbe easily sent to the globe browser from the GRASS session and would require manual editing. To mitigatethis situation, two add-on GRASS modules were created to provide enhanced support of vector exportincluding cartographic information (v.out.kml, Peter Löwe, 2007) and also raster map export (r.out.kml,Hamish Bowman, 2008). References:The current functionality includes raster-map export and the control of line width, opacity, coloring andcustom icons for vectors via general settings and attributes. It is highly effective in scripted GRASS-based r.out.kml: http://grass.osgeo.org/wiki/GRASS_AddOns#r.out.kmlstandalone workflows. This approach enables automated spatial data processing, effectively shielding the v.out.ogr: http://grass.fbk.eu/grass64/manuals/html64_user/v.out.ogr.htmluser from the GIS processing details, while providing KML-based results for interactive examination. v.out.kml: http://grass.osgeo.org/wiki/GRASS_AddOnsvr.out.kmlWith the ongoing development of the KML standard, the scripts continue to evolve to provide more options.Support for timestamps and optimized access for large datasets is under development. RapidEye Maps: http://www.rapideye.de/home/news/news-extra-page.html
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