Digital Geography

Adding projection data to ENVI headers (GIMMS 3g example)

Once in a while you may need to take an unprojected file and add coordinate parameters to the header. Assuming you use ENVI, the hard way is to perform a reprojection via Image to Map registration in ENVI Classic. The easy way is to add the coordinate information to the header file. Here we assume you do not need to warp the file to an ellipsoid or datum. Here we use the example of GIMMS 3g data from the University of Maryland and NASA. Start by importing the data as a Binary file.   It is important to realize that…

Forest fire tracking with Landsat-8

On July 31st a forest fire broke out in the Swedish county of Västmanland. The fire was quite large by Swedish standards covering an area described as 10 x 15 kilometres. There is, to date, one confirmed death. The fire required a intensive response by the emergency services. It is located close to villages and towns and could not be allowed to spread out of control. Firefighters from the Stockholm region were deployed to assist local firefighters, the army reserve was deployed and 10 helicopters were allocated to assist fire fighting. Planes from France and Spain arrived to assist local…