12,481 reputation
1061141
bio website maphew.com
location Yukon Territory, Canada
age
visits member for 4 years, 3 months
seen 5 hours ago

hewer of maps, old time techie, newbie developer

woohoo, http://gis.stackexchange.com/ now open to the public!

personal - www.maphew.com
in-between - yukongis.ca
work - www.environmentyukon.ca

profile for matt wilkie on Stack Exchange, a network of free, community-driven Q&A sites


Aug
27
comment Raster diff: how to check if images have identical values?
@whuber thanks for ensuring proper NoData handling stays in the conversation.
Aug
27
comment Raster diff: how to check if images have identical values?
@radouxju the images range up to 100,000px to a side, so ~30GB uncompressed. We don't have machine with that much ram (though perhaps with virtual...)
Aug
27
comment Raster diff: how to check if images have identical values?
intriguing, I love gdal, didn't know about this script. Docs for interpreting the results are sparse to non-existent though ;-). In my initial testing it reports differences in colour interpretation and pallettes, meaning it might too specific for my current needs. I'm still exploring it though. (note: this answer too short to be a good fit here, link only answers are discouraged, please consider fleshing it out).
Aug
21
comment How to generate automatically the name of output parameters in a python script tool?
there isn't enough detail in your Q for us to help. Perhaps include a sample of your script, reduced to it's simplest possible form (sometimes pseudo code can be clearer than the real thing). Also What GP tool do you see creating a workspace automatically? (most ask for a pre-existing workspace). ...and finally a tip: add the GP tool to a model, then export as python script. That will show you how the tool does it. (And if that works, come back and answer your own question so others can benefit from your research)
Jul
4
comment Setting symbol descriptions of ArcMap layout legends from table?
I solved the problem of having to make descriptions and lookup codes match, see my answer.
Jun
25
comment Recommended ArcGIS Server and RDBMS layout on these two machines?
yes @Vince, by the numbers new hotness has lower CPU megahertz, but the chip is several generations newer and has on board cache and some other stuff I don't understand. I was unable to find a (clear) report which could tell me which is in fact faster in the real world. The physical drives are slower, but the backplane is faster; I dunno what the limiting factor is/are. RAM is a bit of a canard, since it's the easiest and cheapest thing to attack (if we find ourselves constrained there we can change it quickly).
Jun
25
comment Find polygons that contain a specific number of points
There isn't a 1 step solution, combine gis.stackexchange.com/questions/58485/… with Branco's answer below.
Jun
25
comment Find polygons that contain a specific number of points
right idea, but can be even simpler: Spatial Join creates a field automatically called Join_Count, which is the number of times the Join Features (the points) intersect the Target Features (the polygons). (NB: other relationships besides /intersect/ can be used.). Also, you don't need to export, just use a Definition Query on the Spatial Join result to select only Join_Count > 30; see Displaying a subset of features in a layer
Jun
24
comment Setting symbol descriptions of ArcMap layout legends from table?
An interesting idea that might work in some situations. It won't work here though because the description table is just a table, there is no geometry. One could join the geometry and descriptions, but I'm not interested in that extra work or performance hit for this project.
Jun
20
comment Opening ArcGIS Desktop on specific license level?
Here's some batch files implementing Jay's answer. They invoke Arcmap at the license level specified by the filename: github.com/maphew/arcplus/commit/…
Jun
20
comment Which registry key holds the license type in ArcGIS 10.x?
I removed v10.0 tag, as the same setting and procedure works for 10.0 thru (at least) 10.2.2
Jun
17
comment Export ArcGIS Online feature service with attachments
this is the hosted version of Exporting arcgis features with attachments
Jun
17
comment Exporting arcgis features with attachments
thank you ian! This works, but is really just a starting point to a real solution. The exported files are just dumped in a common folder, losing the relationship to the source record. In comments there is a method described to use Record_ID as the filename; too circuitous for me, and doesn't accommodated multiple attachments, but it is better than the default.
Jun
10
comment How to calculate Topographic Ruggedness Index in Arcgis?
thanks Jeffrey. For some reason that page is blank except for the title in Firefox, thought it's ok in Chrome; might be one of my extensions. I'm happy to report at least that the scripts work unchanged in 10.2.2 (ones I tested anyway).
Jun
2
comment Decimal degree coordinates: how many decimal places to use for …?
...not sure why I couldn't find How to measure the accuracy of latitude and longitude? when I posted this question...{shrug} It is very close to a duplicate, but not entirely because the answers there only deal with the equator. Ideally an answer would be added to the other Q to flesh out the latitudinal differences.
Jun
2
comment How to upload a list of 5-digit zip codes to CartoDB?
it would help if you could provide a few lines (at least) of the file you are uploading, to see if others can replicate the problem or notice a problem with the source format.
May
27
comment Exporting table to XYZ ASCII file via ArcPy?
+1 for sleuthing! This works interactively but not as well in a model or script, because the field names must be specified.
May
26
comment Listing all feature classes in File Geodatabase, including within feature datasets?
@blah238: oh. I guess I still don't grok yield then. I understand what a statement like fcs = fcs.append(...) is doing much more quickly than fcs = list(yield(...)).
May
7
comment Copy, not export, a table from Arcmap
after seeing Brad Nessom's similar answer here, I decided the screenshot could benefit from some more context; so updated.
May
7
comment Export table from ArcGis to Excel file
for copy/paste route also see Copy, not export, a table from Arcmap which has methods for newer version of Arcmap as well.