7,165 reputation
1134
bio website dmahr.com
location United States
age 25
visits member for 2 years, 9 months
seen 14 hours ago

Jul
14
comment Distance from rivers, taking into account terrain elevation
Are you trying to determine the flow distance to the nearest river based on flow direction? Or the straight-line distance that accounts for slope?
Jun
22
awarded  arcgis-desktop
May
23
comment Unexpected Polygon Zoom Extents with a Rotated Dataframe
@amasephy Glad that it worked out for you. ArcMap's dataframe rotation functionality is implemented in a klugey way that isn't well supported by ArcPy.
May
22
answered Avoid NoData after Focal Statistics Majority
May
21
revised Unexpected Polygon Zoom Extents with a Rotated Dataframe
added 872 characters in body
May
21
comment Unexpected Polygon Zoom Extents with a Rotated Dataframe
@amasephy Are your grids always the same aspect ratio? I'm assuming you are created a printable map book, so should the maps always be 8.5" by 11" or something like that?
May
21
revised Unexpected Polygon Zoom Extents with a Rotated Dataframe
deleted 5 characters in body
May
21
answered Unexpected Polygon Zoom Extents with a Rotated Dataframe
May
3
comment ArcGIS 10.1 Remove (or SetNull) areas of overlapping rasters
@Markus Glad to hear it. I don't know why the issue wasn't solved by changing raster calculator's extent, but at least this workaround fixed the issue.
May
3
comment ArcGIS 10.1 Remove (or SetNull) areas of overlapping rasters
@Markus It looks like the processing is being limited to the extent of the roads_raster layer. Try rasterizing your roads again with the "Extent" environment variable set to the suitability layer (along with the correct snap raster and cell size) so it's the full extent.
May
3
comment ArcGIS 10.1 Remove (or SetNull) areas of overlapping rasters
@Markus Can you post a screenshot? I'm having trouble visualizing what you mean by "some of the corners have been cut off in a perfect line."
May
3
comment ArcGIS 10.1 Remove (or SetNull) areas of overlapping rasters
@Markus Two ideas. First, try setting the "Extent" environment variable of Raster Calculator to be the suitability layer. Second, try making sure that all of your layers are in the same projected coordinate system.
May
3
answered ArcGIS 10.1 Remove (or SetNull) areas of overlapping rasters
Feb
7
comment What to do when raster cell size is larger than zonal vector feature in order to collect statistics?
@XNSTT I would encourage you to test out the different methods for a small section and evaluate the pros and cons of each resampling method yourself. You're right that BILINEAR and CUBIC can blur boundaries a little bit compared to MAJORITY and NEAREAST, but it's not that pronounced. Remember that the algorithm assigns less weight to cell centers that are farther away.
Feb
5
comment Watershed delineation; how to program
Are you sure your flow direction raster doesn't have any intermediate (a.k.a. undefined) directions? The ArcGIS Flow Direction tool sums direction values when the change in z-value is the same for multiple directions: "For example, if the change in z-value is the same both to the right (flow direction = 1) and down (flow direction = 4), the flow direction for that cell is 1 + 4 = 5."
Feb
4
comment Want data from multiple rasters, but only for given points
@SoilSciGuy First thing to do is isolate the problem: attribute table vs. number of rasters. To that end, do you get the same error when running Extract Multi Values to Points with two of your .tiff files?
Feb
3
answered cloud shadow detection
Jan
30
awarded  Nice Answer
Jan
30
answered How do you symbolize “Unique Values, Many Fields” with more than 3 fields?
Jan
30
comment How to extract the number of vertices in each polygon?
@Roland You are right...I missed the part of the question about XY vertices. In that case you'll have to use the SearchCursor method in Aaron's answer or a geoprocessing tool like Feature Vertices To Points (though this tool requires an ArcGIS for Desktop Advanced license).