arcgis-10.0arcgis-desktoparearaster-calculatorspatial-analyst
My problem is that I would like to multiply two rasters using raster calculation tool. Both rasters have values 0 and 1, but the covered area of first raster is bigger (100 x 100 miles) then the area of second (80 x 80 miles).
How can I extend the second raster to the same size?
I would just like to add columns and rows with 0. At first I thought that this would be simple, but after searching on internet I didn't found any solution.
The cell size is not used to allow adjustment. You have to manually adjust the resolution of the coarser raster to make it match the finer raster (or set the Cell size raster analysis environment to Minimum of Inputs).
"Some of the area values in the output table may be smaller than what you may have expected.
This is typically related to NoData cells in the input with a higher resolution becoming a larger area of NoData after it is resampled to match the other, coarser input.
To avoid this situation, use either Resample on the coarser input raster to make it match the resolution of the finer input raster, or set the Cell size raster analysis environment to Minimum of Input"
INPUT:
After dissolving zones use following WORKFLOW:
arcpy.Intersect_analysis("GRID #;ZONE #","D:/Scratch.gdb/intersect")
arcpy.Sort_management("intersect", "D:/Scratch.gdb/sorted","Shape_Area DESCENDING")
# DELETE MINORITIES USING GRID ID
arcpy.DeleteIdentical_management("sorted", "ID")
OUTPUT SHOWS "SORTED" AND GRID:
Transfer dominant zone ID to grid layer from "sorted", using join by attributes, if necessary.
Important update a year later: each zone must be a single, potentially multipart polygon. If this is not a case original zones layer must be dissolved by zone name.
Best Answer
Right-click on your layer > Properties > Extent tab
From here you can set your raster extent to that of another layer. You can then use the Conditional tool to assign whatever value you like to the extra pixels, which default to NoData. Further instruction here.
Depending on your application you may need to also implement the IsNull tool.