13,103 reputation
1372159
bio website maphew.com
location Yukon Territory, Canada
age
visits member for 4 years, 11 months
seen yesterday

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


Jun
12
comment Get boundary of raster image as polygon in ArcGIS Desktop?
Hi Seamster02, welcome to GIS Stack Exchange :) As written this is not appreciably different from the accepted answer, gis.stackexchange.com/a/22016/108.
Jun
12
comment Get boundary of raster image as polygon in ArcGIS Desktop?
@Fezter, this comment was migrated from answer to Q, Since it's no longer in context it doesn't make much sense. It's served it's purpose and can be removed now. ;-)
Jun
12
comment Interactive “for each item in … do …” in QGIS?
how would this be fired? Say I'm in qgis and have loaded a polygon shapefile and selected some of them. How do I push them to the operation/script?
Jun
12
comment Interactive “for each item in … do …” in QGIS?
@MichaelMiles-Stimson yes exactly, 'for every feature in layer' or 'every feature in {selection}'
Jun
11
comment ArcObjects/Python: Add JPG to layout
"recasting" was probably a poor word choice Michael. I just meant "re-write for". This answer is so far one of the best examples I've seen of how one can step through and understand the ArcObjects documentation for someone coming from the python world. I think the process it describes deserves more exposure.
Jun
11
comment Is there a Raster Equivalent of the Split tool?
...and a toolbox ready python answer: gis.stackexchange.com/questions/37325/…
Jun
11
comment Is there a Raster Equivalent of the Split tool?
a python answer is here: gis.stackexchange.com/questions/37325/…
Jun
4
comment How to convert the geographical projection of an extremely large file (GDAL)
this might be 64bit vs 32bit. In any case I'm glad you found a solution and thanks for sharing it. If you haven't already I would verify the end product has the right pixel size and wasn't resampled too coarsely (e.g. rule out the possibility Qgis was faster because it took a shortcut).
Jun
3
comment How to convert the geographical projection of an extremely large file (GDAL)
Cut the image in 4 (or 8 or ...) and then warp each piece. Use nearest neighbor resampling so that values do not change (20 stays 20, never becomes 25). At the other end create a .vrt, virtual raster table, to mosaic the images seamlessly. ....actually now that I think about, first try creating a vrt for your existing images in the desired final projection.
Jun
2
comment What is the simplest method to add GPX files into Arcmap?
Thanks for sharing, but you're working too hard! KML can be ingested in one or two steps, see Posts containing 'import/export kml to arcgis desktop'
Jun
2
comment What is the simplest method to add GPX files into Arcmap?
thanks gotchula, but Cindy Williams already added this, here: gis.stackexchange.com/a/49344/108
Jun
1
comment Is it possible to open rasters as array in NumPy without using another library?
Excellent well rounded answer. Thank you for providing a number of alternatives.
Jun
1
comment Best way to clip a large raster ECW file ?
gdalwarp was already mentioned. The info about performance and specific example image size is a welcome addition, but really this should be a comment to gis.stackexchange.com/a/74450/108 (and making a suggested edit with the command line with code formatting would be welcome too; it is easier to read)
May
27
comment Enabling public viewers and private editors of feature service on ArcGIS Online For Organizations?
+1 and removed my downvote. I've confirmed "Add as editable layer" works for me here, however editing from Desktop still does not. I can live with that for what we're doing right now. This is a band-aid and not a sustainable solution though; adding all editors as organization administrators is a mistake waiting to happen.
May
25
comment How can I convert an excel file with x, y columns to a shapefile?
Online service to help build a properly formatted vrt file: vrtbuilder.appspot.com
May
25
comment How can I convert an excel file with x, y columns to a shapefile?
Loading Excel files directly into ArcGIS works wonderfully well -- except when it doesn't! Things to watch for: dates mangled, numbers truncated. First troubleshooting step is always to export to CSV with all columns defined as text and load that instead to see of problem perseveres. That caveat aside. Display as X/Y works very well.
May
25
comment Overviews: to tiles or .vrt, or both?
yes to the 2nd response, 2 4 8 for tiles and 16 32 64 for vrt.
May
25
comment Overviews: to tiles or .vrt, or both?
the hybrid idea is very interesting! I'm curious about why a physical file at level-16. Does that offer something gdaladdo foo.vrt 16 32 64 doesn't? ...it also occurs to me: both tiled and vrt overviews might be wanted in instances where individual tiles are access as well as the virtual mosaic.
May
21
comment How to download the entire ASTER GDEMv2 dataset?
@Simbamangu, see update, go to Japan.
May
21
comment Opening a .rrd file format in QGIS 2.6?
Gdal does support .rrd, see gdaladdo flag --config USE_RRD=YES|NO. Though maybe it uses the same extension for a different internal structure? The nub of the answer is dead on though, open the tiff; the other files are side-car metadata.