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bio website dmahr.com
location United States
age 26
visits member for 3 years, 6 months
seen 16 hours ago

23h
revised Can I reproduce this classic cartographic hillshade relief effect (hachures) electronically using modern DEM data?
deleted 81 characters in body
May
18
comment Creating bathymetric contours using shoreline point data and transect point data
You're seeing the "pinching" because the interpolation tools in ArcGIS are naively interpolating based on point locations without any regard for hydrologic processes, sedimentation, etc. For this reason, more specialized bathymetric interpolation tools are probably needed to create a robust result unless you have many transects. This question goes into some of the other options. There's also a lot of literature about bathymetric interpolation.
May
16
comment How to calculate the distance to the nearest coastline from site locations?
For those without an ArcGIS for Desktop Advanced license (formerly ArcInfo license), this can be accomplished with the Spatial Join tool. The target_features would be the points, the join_features would be the coastline, and the match_option would be CLOSEST.
May
16
revised Debugging AttributeError: 'Result' object has no attribute 'save' from ArcPy script?
Added code indentation and syntax highlighting
May
15
comment Headings in legends
+1, clever workaround!
May
14
answered Headings in legends
May
12
comment Visualizing overlapping polygons by occurence
You might want to play around with this answer about creating a heatmap by overlapping polygon area.
May
9
comment Find and replace with Greek letters returns question mark in ArcGis 10.3
Before going further, try playing around with the solutions posted in these three questions: Which character encoding is used by the DBF file in shapefiles?, How to read Greek fonts (ISO-8859-7) in shapefile attributes within QGIS 1.8.0? and Character encoding support in geodatabases and shapefiles.
May
5
answered How to combine two rasters based on the relationship to a polygon mask?
Apr
30
comment How can I parse modis MOD13Q1 quality layers in R?
It's cleaner and faster since the computer can keep everything in binary; the downside is that it's harder to debug what's happening under the hood. My R is rusty so I can't speak to your code syntax.
Apr
29
answered Using arcpy.mapping.ListLayers() with no filter, but some layers are missing in list
Apr
29
comment How can I parse modis MOD13Q1 quality layers in R?
I would recommend using bitwise logical operations to parse MODIS QA bands instead of converting to a string of binary digits. See this answer for a detailed walkthrough.
Apr
24
answered Writing out comma separated values inside a single cell in a spreadsheet using python
Apr
24
comment Are there any conditions that could break the creation of an arcpy.Polygon object?
ArcPy denotes the start of an internal ring using a None object. I don't know why this would happen, though. My only suggestion is in your arcpy.Array(), try repeating the first vertex at the end to "close" the polygon.
Apr
23
revised Distance of points to nearest polygon edge in ArcGIS 10.2
Fixed link to Near geoprocessing tool.
Apr
22
comment Different page sizes in Data Driven Pages?
Also relevant: it is not currently possible to change page size using arcpy.
Apr
21
comment Clip Point Features to Polygons with Model Builder/ArcPy
@zrobby You are welcome. As @jbchurchill commented, this should be possible with Data Driven Pages using page definitions. But I find arcpy.mapping to be much more flexible and worth learning, since you can change coordinate systems, rename layers, edit text elements, move layout elements, and other advanced features that aren't possible with Data Driven Pages.
Apr
21
comment Problem with arcpy select statement
+1 for referencing arcpy.AddFieldDelimiters(). This should really be standard practice, in the same way that os.path.join() should be used instead of naive string concatenation.
Apr
21
answered Clip Point Features to Polygons with Model Builder/ArcPy
Mar
23
comment From everywhere to everywhere in spatial network
@SteveWernke Glad I could help. If you're all set for now, please accept the answer so this question is no longer outstanding. Thanks!