Community
Select to view content in your preferred language

ArcGIS 10 Raster Analysis Mask Bug Report

485
1
02-17-2011 11:47 AM
AndyRitchie
by
Frequent Contributor
‎02-17-2011 11:47 AM
I've noticed that if I am doing simple addition, subtraction, or multiplication with two grids of different cell-sizes, and I set both the raster analysis cell size and the raster analysis mask to be that of the smaller grid, the output is mangled - it almost looks like it's incorporating the cell size of the LARGER grid into the mask somehow, but I don't really care, it's broken.

Workaround is to not set the analysis mask.

In the below image (Screenshot attached) you're looking at the results of adjusting four bathymetry MLLW datasets to NAVD88 by adding a Topography of the Sea Surface grid and subtracting a MLLW grid extracted from VDATUM. All grids are in same datum, VDatum grids are 0.0005 degrees, and the bathy rasters are from 0.5 to 4m resolution.

. Also I can't believe that there isn't a better place to report bugs. These new forums are like a bowl of spaghetti someone dumped on the floor. If someone found a bug-reporting forum somewhere, please let me know.
Preview file
55 KB
0 Kudos
1 Reply
curtvprice
by MVP Alum
MVP Alum
‎02-18-2011 01:25 PM
I've noticed that if I am doing simple addition, subtraction, or multiplication with two grids of different cell-sizes, and I set both the raster analysis cell size and the raster analysis mask to be that of the smaller grid, the output is mangled - it almost looks like it's incorporating the cell size of the LARGER grid into the mask somehow, but I don't really care, it's broken.

Workaround is to not set the analysis mask.

In the below image (Screenshot attached) you're looking at the results of adjusting four bathymetry MLLW datasets to NAVD88 by adding a Topography of the Sea Surface grid and subtracting a MLLW grid extracted from VDATUM. All grids are in same datum, VDatum grids are 0.0005 degrees, and the bathy rasters are from 0.5 to 4m resolution.

. Also I can't believe that there isn't a better place to report bugs. These new forums are like a bowl of spaghetti someone dumped on the floor. If someone found a bug-reporting forum somewhere, please let me know.


It's generally problematic in my experience doing raster analysis unless all the participating data sets (data layers, masks, etc) are in the same coordinate system. The cell sizes and extents don't always translate the way you expect -- the best way is to have everything in a projected coordinate system like UTM or Albers.

Bug reporting and technical support is available at http://support.esri.com.
0 Kudos