I have a group of classified raster files, showing point densities at 3 intervals. I want to create contour lines based on this data at these same intervals. I'm guessing this should be fairly easy, but how? I'm on ArcGIS 10.1.
EDIT:
I have about 100 raster files, each of them is a group of points which I've performed a Kernel Density Estimation on, so is now a raster. I've classified these into 3 classes 15-50, 50-100, and 100-250 (there is also a 0-15, but I don't need this included). How would I go about creating contours at each of the limits of the 3 classes I want to keep?
Martin – Deleting extra contours would be fairly time-consuming. The operation would preferably be done as a batch – they all have the same class symbology and they would all have the same contour limits too.
Best Answer
You should use the Contour function for converting a raster to contour lines. You can also define the base contour value and the interval between them (z-value).
Since you need to do this in batch, I would use Model builder. Iterate over your folder with rasters and use the Contour function. But instead of deleting excess lines, use an interval so large that it ensures no more lines will be created. Then let the model do this three times for each raster to get all levels you want.
Keep in mind that this function requires Spatial analyst or 3D analyst extension.