In my previous post I noted that the fact that the global deforesation map produced by Hansen et al has been placed on an interactive portal equipped with streetview and high resolution background imagery allows anyone to validate the results. One way the web portal could be enhanced would be to provide tools that allow…
I have just imported a Landsat path and row shapefile into PostGIS from http://landsat.usgs.gov/tools_csf.php. I thought this might have some general utility when looking for images (for example from http://www.landsat.org/ortho/ortho_max.htm) , although there are of course very many sites (eg GLCF) that have the same information.
R is of course a statistical environment, so it really shouldn’t be expected to be doing the job of GRASS (Nviz), Google Earth, WorldWind, Qgis or Udig as well. However some nice visualizations can be done with rgl, including rgb composites from satellite images. They can even be more useful for quick regional overviews than…
The animation above first shows an accessibility index calculated as a cost surface with the entrance to the watershed as a starting point. There is an excellent “How To” on calculating cost surfaces in GRASS available here. The cost surface (warm colours accessible, cold colours inaccessible) is followed by an animation of deforestation estimated by…
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