Hi Guys. I have a DEM for the remains of a fort and am wanting to carry out edge detection processes. I'm very unexperienced with this type of analysis and am lost after carrying out high and low pass filters. I ideally would like to carry out some of the convolution processes outlined in the Arc guide however can't figure out where to find these tools. Please help!!
you are referring to the convolutions filters I assume. And you have used the filter tool first?
Image analyst window processing
A demo of the process not using the above. The details are not important yet, but the principles are the same.
That is basically what the raster functions do. I have done this in numpy but the principles are the same
:------------------------------------------------------------------
:gradient east ... filter...
[[ 1 0 -1]
[ 2 0 -2]
[ 1 0 -1]]
:array...
[[1 1 1 1 1 2 2 2 2 2]
[1 1 1 1 1 2 2 2 2 2]
[1 1 1 1 1 2 2 2 2 2]
[1 1 1 1 1 2 2 2 2 2]
[1 1 1 1 1 2 2 2 2 2]
[3 3 3 3 3 4 4 4 4 4]
[3 3 3 3 3 4 4 4 4 4]
[3 3 3 3 3 4 4 4 4 4]
[3 3 3 3 3 4 4 4 4 4]
[3 3 3 3 3 4 4 4 4 4]]
:filtered...
[[ 0 0 0 -4 -4 0 0 0]
[ 0 0 0 -4 -4 0 0 0]
[ 0 0 0 -4 -4 0 0 0]
[ 0 0 0 -4 -4 0 0 0]
[ 0 0 0 -4 -4 0 0 0]
[ 0 0 0 -4 -4 0 0 0]
[ 0 0 0 -4 -4 0 0 0]
[ 0 0 0 -4 -4 0 0 0]]
:converted to 0,1
[[0 0 0 0 0 0 0 0 0 0]
[0 0 0 0 1 1 0 0 0 0]
[0 0 0 0 1 1 0 0 0 0]
[0 0 0 0 1 1 0 0 0 0]
[0 0 0 0 1 1 0 0 0 0]
[0 0 0 0 1 1 0 0 0 0]
[0 0 0 0 1 1 0 0 0 0]
[0 0 0 0 1 1 0 0 0 0]
[0 0 0 0 1 1 0 0 0 0]
[0 0 0 0 0 0 0 0 0 0]]