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January 6th, 2013
Pansharpening Satellite Imagery for Easier Tracing into OpenStreetMap

GeoEye and the Humanitarian OpenStreetMap Team (HOT) are collaborating to trace new satellite imagery of Salajar Island, Indonesia, an under-mapped area in OpenStreetMap. This is part of HOT’s larger work in Indonesia organizing workshops, competitions, and mapping events to provide detailed OSM maps for use by disaster first-responders and policymakers to aid in the country’s emergency preparedness efforts. To help HOT’s tracing efforts we processed imagery for Salajar Island from the GeoEye-1 satellite, which captures panchromatic (black and white) images at a resolution of 0.5 meters per pixel, and multispectral imagery (red, green, blue and near infrared) at a spatial resolution of 1.65 meters. A key step in our data processing was pansharpening, which merges the lower-resolution color image with the higher-resolution panchromatic one. Read More