12,096 reputation
958134
bio website maphew.com
location Yukon Territory, Canada
age
visits member for 4 years
seen Jul 16 at 23:37

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


Mar
11
comment Problems merging DEMs or other raster datasets? Clipping Raster dataset to vector line?
+1 for the edit describing how to accomplish the task
Mar
11
comment Mosaic to New Raster() tool seems to interpolate data gaps on one computer but not another, what's going on?
I've no idea what's going on, just guesses. Do the source rasters have identical projections on both machines? is the output projection identical on both? If there is a coordinate transform involved in one and and the other you might see something like this. 2nd thing to look at, paying close attention to detail, is the Geoprocessing Environment settings on each machine (under "Geoprocessing" tool menu).
Mar
10
comment Best choice for building static maps: PostGIS, SpatiaLite or Shapefile?
I'm intrigued with the note about shapefiles easily handling custom projections; this could be especially important. Does this mean postgis and sqlite do not handle non-EPSG coordinate systems?
Mar
10
comment Differences between PostGis and SpatiaLite
To my eye both of the Q's linked by @AndreJoost and @-Below are the same question, however neither contain answers that do more than touch a couple of high points. It would be good to see a more in depth exploration of the question. Leaving open in case that happens. If not, I suggest merging the three.
Mar
7
comment Manually edit a raster to improve a classification?
@radar, it's possible to use any graphics program that understands regular tiffs: 1) save georeferencing, 2) paint image -- being careful not to change dimensions, or using colour values outside the valid data range, 3) save, 4) restore georeferencing from #1. This work flow is worth a new question on it's own; the closest answer I see so far is gis.stackexchange.com/a/24798/108, while the subject for this Q gis.stackexchange.com/questions/76572/touch-up-tool-for-rasters is perfect (body is a bit too specific).
Mar
5
comment Is it possible to add python util scripts as shared libraries to esri geoprocessing toolbox?
ok, thanks for the clarification, re-opened. I think you'll likely have to export the py from the .tbx, so it sits as it's own file on disk. Or try converting it to a python-toolbox.
Mar
5
comment How do I export symbology to ArcGIS Online?
@brichins yes the symbols are saved as bitmaps on their infrastructure (but exactly where and how is hidden, you can't just edit and replace .../some/path/to/symbol.png. The whole service definition needs to be re-uploaded)
Mar
3
comment Is it possible to add python util scripts as shared libraries to esri geoprocessing toolbox?
you should just need to sys.path.append('C:/Working/SomeFolder') before your import. If the linked Q doesn't answer your question please flag for reopening (and explain how it doesn't fit).
Feb
28
comment Looking for (nearly) worldwide elevation data
I've been asking for price and availability on the Astrium elevation for several months, "we haven't decided on price yet", so it's still just vapour ware, though I sure hope all that mist blows away soon! (+1 for aster and srtm are maxed out)
Feb
18
comment Automaticallly select and replace all occurences of a font face
This is a significant question that deserves in depth exploration. Answerers please don't restrict to the specific details in the question as originally asked. In any sizeable collection of mxd's it can be assumed that all text types will be have been used -- map annotation, feature class annotation, graphic elements -- and that they all need to be processed to identify and change the transgressing font faces used. (However please do be clear which type your solution addresses.)
Feb
11
comment How to Convert PDF files into ArcGIS Metadata?
@PMessager I hear and understand -- with empathy! We can't always change or scale the wall, but our attitude to it is entirely ours to adjust.
Feb
6
comment How to Calculate fields for attribute table using Model Builder
We encourage self answering! A good answer is a good answer regardless of who is talking. Please add your solution using the answer section below (and then tick the check mark to acknowledge it as being the solution that worked for you).
Feb
6
comment How to compile QGIS with Oracle Spatial support for Linux?
possible answer here gis.stackexchange.com/questions/74842/…. It's for OSX but going by description it might apply to linux as well (need to download the Oracle SDK seperately).
Feb
6
comment How to Convert PDF files into ArcGIS Metadata?
Let me see if I have this right: you have a bunch of geometries in shapefile(?) format, that came with PDFs describing their content. You would like to extract metadata from the PDFs that can be used by ArcGIS. Yes? If so, you're likely looking for some kind of pdf2xml conversion tool, among others. Really though, without a sample of the shapefiles and accompanying documentation, or a detailed description of them, no one will be able to give specific (e.g. useful) help.
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.