Truncated Spatial Results from Cell Statistics tool using SUM statistic.

[LaurieKurilla1]

BACKGROUND:  I have 12 rasters, each of which I have reclassified (using RECLASSIFY tool).  That is, each pixel of each raster has a value of  0 or 1 depending on the presence or absence of a particular value in each raster layer.  Then I use Cell Statistics to sum all 12 rasters.  This provides me with an output raster with the summed values, which is then a classification map.

PROBLEM:  I found that the output was truncated spatially.  That is, instead of showing the entire region (in this case Asia), it is showing a rectangular subset.   I went back and looked at each individual raster and redid some of them to ensure they were all in the right format.  But no luck.  Then I tried doing a pairwise Cell Statistic run with only two raster layers at a time and some other types of tests.   

There are just a few layers when added will create this truncated result.  So there must be something to do with extent of the layer which doesn't cause a display problem when displayed alone.  These are all projected in Mercator Sphere.  If it is the 'extent' where would this have been defined and can I change it?  Any other suggestions?

Thank you!

[DanPatterson · Accepted solution]

Cell size, raster extent and snap raster should all be specified.  Every tool has an Environments tab... most often it is missed and it is the most important one.

[LaurieKurilla1 · Accepted solution]

Brilliant!  I have poked around in Parameters and Environments tabs a couple of times over the past months but never took the time to really investigate their meaning and importance.  I bow to you Dan Patterson!  Within 15 minutes I was able to achieve what I could not after about 50 hours of frustration.

Thank you, thank you, thank you.

Laurie