Otto Dassau
Managing Director GDF Hannover bR
GermanyAbstract of the presentation:
Coastal zone vegetation classification of East Frisian islands, Germany
GDF Hannover in collaboration with its partner company nature-consult developed an algorithms to continue the monitoring of the East Frisian islands by classifying recent digital aerial imagery (HRSC-AX und DMC cameras). The project is realized on behalf of the Wadden Sea National Park of Lower Saxony (Nationalparkverwaltung Niedersächsisches Wattenmeer) in Germany and includes mapping of the total terrestrial area of the national park (~2.400 km²). The aim of the project is to support the field survey of biotopes by delivering precise and accurate geometrical units (vector polygons) with attributes. This was worked out in a timely and cost effective fashion.
Core algorithm of the image classification was the "Sequential Maximum a Posteriori" (SMAP) multispectral segmentation algorithm implemented in the Geographic Resources Analysis Support System, commonly referred to as GRASS GIS. SMAP is based on an image pyramid approach which allows a combined radiometrical/geometrical classification. This takes possible similarities of adjacent pixels into account and delivers high quality results.
GRASS is a raster/vector GIS, image processing system, and graphics production system. It contains over 300 programs and tools to render maps and images on monitor and paper; manipulate raster, vector, and sites data; process multi spectral image data; and create, manage, and store spatial data. GRASS is Free Software, released under GNU General Public License.
Bio:
Professional Background:
- (1997 - 2003) Study: Physical Geography and Landscape Ecology in Hannover - (since 2003) Managing Director of GDF Hannover bR
Working fields:
- GIS consulting for free software products - Statistic und geostatistic analysis of spatial data. - Remote sensing
Events: Geo Information Systems (GIS)