11,672 reputation
654129
bio website maphew.com
location Yukon Territory, Canada
age
visits member for 3 years, 9 months
seen 20 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


Feb
4
comment Python equivalent of gdalbuildvrt
Just found a use-case for having a python equivalent: adding unsupported features. For example the vrt file format supports an overviews element, but gdalbuildvrt doesn't use it. Thanks for providing a stub how this might be added in python.
Feb
4
comment Large mosaic process failing - what are the options? software independent only focussed on result
Nice post. Please note gdalwarp when actually warping (e.g. reprojecting, resampling, etc.) has a long standing issue with creating output much bigger than needed when compression is used. In these instances it's better to skip compression at the gdalwarp phase and follow up with a gdal_translate -co compress=xxx afterwards. This isn't an issue if being just used as a translator (as is suggested here).
Feb
3
comment Need symbology that allows for symbols based on multiple fields, sometimes simultaneously (for certain features)
@Mitchell: an often overlooked technique is to use unique-values-many-fields > Add All Unique and then ctr-select relevant records that should be one, followed by r-click > Group Values.
Feb
3
comment Need symbology that allows for symbols based on multiple fields, sometimes simultaneously (for certain features)
Performance can be improved by using a definition-query to select each symbol type for each layer (as opposed to loading all of the feature class multiple times and only symbolizing one or two types, leaving the rest blank).
Feb
3
comment Add EPSG:3857 geometries to map using Leaflet
have a look at cs2cs from the proj4 library and tools project. There are some online conversion tools using it as well.
Feb
3
comment How to Complete ModelBuilder Process Quicker?
I venture that outside of someone chiming in who as already investigated this and arrived at a conclusion, the best/only way to get to the bottom of this is to build and share a test script and data which people can poke and prod at on their own machines.
Feb
3
comment recalculate latitude and longitude from a pixel in a cropped map
in addition to @martinf's comment, needing to know the map's coordinate system (projection) if the map image is available publicly that might help answerers as well.
Jan
31
comment Export ArcMap cartographic representation to a symbol?
Vote for ArcGIS Idea - Cartographic Representation editor as default symbol editor, & import/export SVG, EMF
Jan
31
comment Is it possible that a good spatial index just cannot be made?
what kind of database are you using? (postgres, oracle, spatialite, etc..) This kind of thing could be db-dependent.
Jan
31
comment How can i find shrines nearby location
CY5, judging from the series of questions you're asking you are clearly determined to achieve a goal. That is admirable! We would be better able to help you if used some of that determination to add more detail to your questions.
Jan
31
comment Program to create EMF that conserves transparency
Arcmap 10.2.1 respects EMF transparencies. I don't know at what release this first occurred; at least it works now!
Jan
30
comment Export ArcMap cartographic representation to a symbol?
@DPierce and Dan C: inserting .png doesn't work as Arcmap is ignoring background transparency. Guess I'll have to go through the work of creating a vector version (and determining which filetype Arcmap will handle properly).
Jan
30
comment Export ArcMap cartographic representation to a symbol?
@DPierce, no I hadn't thought of thought. It may be my last resort (bitmaps scale very poorly relative to vectors)
Jan
30
comment ArcMap - cartographic representation and labels
ahhh, thanks for this! Have been stumbling around this for awhile. (BTW, it's okay to mark your own answer as correct)
Jan
30
comment Open Source True Ortho Software
If the linked possible duplicate is not really a duplicate, perhaps because the solutions there don't do "true" rectification, please explain how your question is different. Thanks :)
Jan
30
comment How to handle crashes on save causing “Project file read error: unexpected end of file at line 1 column 1 for file [pathway]”?
@luz (and Karl) this kind of error has a better chance of being answered on QGIS mailing list or irc. See qgis.org/en/site/forusers/support.html
Jan
30
comment Evaluating the geocode precision of US addresses
I expect the answer to be no, you can't do it without inspection. In order to do it programmatically or automatically there would need to be a gold standard, available as a service, to compare against. To the best of my knowledge that doesn't exist.
Jan
30
comment Arcmap: how to select features with attachments?
Accepted as correct because it does answer the question asked, though why a person should have to define a soft related table link when a hard relationship class link already exists is beyond me. Still some more work to be done before feature level attachments are a first class citizen I guess. :-/
Jan
29
comment Arcmap: how to select features with attachments?
Huh; doesn't work for me. Under "Related Tables" it says "None". Though if I use ArcCatalog and explore the file-gdb it has Points_of_interest (point feature class), Points_of_interest_ATTACH (table), Points_of_interest_ATTACHREL (relationship class) listed. Using Identify on a point with known with attachments does show them. Explicitly adding the *_ATTACH to the table of contents doesn't change anything. If I manually create an additional relationship between FC and *_ATTACH then the recipe works. So I can get what I want eventually, but the process is broken.
Jan
28
comment GDAL: Convert specific RGB (GeoTIFF) color to transparent
@kyle hah! that's funny, and embarrassing. I guess that means I'm earning my grey hairs, don't remember some of my own work. :)