12,152 reputation
1065148
bio website maphew.com
location Yukon Territory, Canada
age
visits member for 4 years, 5 months
seen 8 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


Mar
19
comment ArcGIS Raster Mosaic Dataset and GDAL VRT, when to use?
wow. 12 days and not a single response, though a couple of up-votes and a favourite. Too general a question, or perhaps there's no one about with enough experience in both to comment?
Mar
19
comment Does it matter what webserver (Apache, IIS, …) is used with Geoserver?
in that case it would be better phrased along the lines of "Does it matter what webserver (Apache, IIS, ...) is used with Geoserver?" followed by a rough description of what the business goals are (best interactive maps of ski hills in Yagamarphoo), what environment is like (all windows/linux/mac machines, primarily using ___ GIS software) and what kind of background or skillsets you and your colleagues are bringing to bear.
Mar
19
comment MapInfo very slow to start-up
Hi, welcome to GIS.se :) Normally this kind of answer would get a post notice added, "too short, not enough context, might get removed", but in this case it seems to be okay. Just thought I'd let you know for future contributions. :)
Mar
14
comment Preparations for a transition to ArcSDE
It's very unlikely your city is about to purchase ArcSDE, it hasn't been sold since 9.2, and is now part of ArcGIS Server.
Mar
14
comment changing central meridian in QGIS causes problems
This does look like a duplicate, but leaving open for another day so Jakob can confirm
Mar
13
comment Set a RANGE of values as nodata in a .vrt?
...but has some limitations in ArcMap (10.2.1). The vrt will display and symbolize okay, but conversion and exports will scale all values, not just the lower range; e.g. input pixels of 252 and 1894 will turn into -2 and 5015. So do conversions with gdal_translate instead.
Mar
13
comment GDAL equivalent of ArcGIS Mosaic
@Aaron in this context Mosaic and MosaicToNewRaster are the same thing, and yes I'm looking for control of how overlap is handled.
Mar
13
comment GDAL equivalent of ArcGIS Mosaic
There was no intent to compare the full system against a library, just a single tool from that system (Mosaic) against a single process/workflow which I think is in the library but just can't find. Thanks for bringing in Envi & Imagine. I have no meaningful exposure to them, so it's good to expand the horizon.
Mar
12
comment Make the nodata area of a resampled orthophoto overview white?
general windows cmd note: use caret ^ for a line break that will be joined when executed (e.g. add ^ to the end of each code line example above to keep both legibility and run-ability). Important caveat: never end a file or command line with a caret unless you want to invoke consume all memory
Mar
12
comment GDAL and Python: How to “pad the extent” or otherwise handle band.ReadRaster() for area falling slightly outside the image bounds?
you might be able to do something with gdalbuildvrt -te, set target extent, and -hidenodata, "...Useful when you want to control the background color of the dataset. By using along with the -addalpha option, you can prepare a dataset which doesn't report nodata value but is transparent in areas with no data."
Mar
12
comment Set a RANGE of values as nodata in a .vrt?
Thank you so much, that works swimmingly.
Mar
12
comment GDAL and Python: How to “pad the extent” or otherwise handle band.ReadRaster() for area falling slightly outside the image bounds?
Rather than adapt the image to the tile system how about editing the tile index to match image? (Old question, I know)
Mar
12
comment QGIS v2. Convert longitude/latitude to UTM projection-Zone 51J - Southern hemisphere
Lisa if the linked question is not an answer, please feel free to add more detail which explains how this Q is different and flag for re-opening.
Mar
11
comment Raster clipping over 1300 km2 orthophotos
@Dowlers loading from network is no longer automatically slower than disks, Are networks now faster than disks? - Server Fault (though that's still true for most)
Mar
11
comment How to Mosaic DTED files (RasterDataset) using C#?
it would be good to have at least the gist of that other post here. In the course of time the link will be broken, and then this will be just empty and not help anyone.
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 ArcGIS Mosaic to New Raster() tool seems to interpolate data gaps on one computer/version but not another?
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).