I would like to calculate image new from image1 and image2 as follows:
if (image1.value = value1)
then
if (image2.value = value2)
then new.value = value2
else new.value = value1
I don't know how to do this with Image Calculator, OVERLAY or another module. Any ideas are welcome.
Thanks, Rolf
You could create a macro that does the following 5 operations:
1. Use Reclass on image1 to create Mask1, where all values that = value1 become 1, and the rest become 0.
2. Use Assign on Image2. Assign all values that are equal to value2 to stay value 2 (there will only be 1 line in the .val file with: value2 value2). The rest will become 0. Call this output Image2B.
3. Use Overlay to multiply Image2B x mask1.
4. Use Overlay to multiply Image1 x mask1 = Image1B
5. Use Overlay Cover, to cover iamge1B with Image2B (put Image2B on top).
Thanks Tammy! I think I see the way to proceed. I forgot to mention that there are other values in image1 and image2 to consider but I must first define how they should be combined.