12,788 reputation
1369157
bio website maphew.com
location Yukon Territory, Canada
age
visits member for 4 years, 10 months
seen 2 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


7h
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.
2d
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
2d
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.
2d
comment Overviews: to tiles or .vrt, or both?
yes to the 2nd response, 2 4 8 for tiles and 16 32 64 for vrt.
2d
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.
May
20
comment How to set feature vertex Z from an intersecting feature's Z?
here are my incomplete attempts to resolve this: github.com/maphew/arcplus/commit/…. This part of the overall project has gone dormant, so I won't be following up for awhile.
May
20
comment How to set feature vertex Z from an intersecting feature's Z?
Thanks for Integrate. I didn't like how FeatureToLine moves vertices unpredictably and breaks things into smaller pieces. I've been given the "time to move on!" signal from supervisor so won't be following up on the arcobjects portion right now. This part of the bigger project has been put to sleep. :-/
May
19
comment ArcGIS/arcpy: Geometry object comparison methods not working. Do they take z values into account?
Might have to do with floating point rounding/truncation when a spatial reference system is not explicitly set, see gis.stackexchange.com/questions/40481/…
May
19
comment How to set feature vertex Z from an intersecting feature's Z?
@Hornbydd yes. I want to assign blue Z at the point of intersection to equal red Z.
May
15
comment Seeking web service that returns elevation profile between two points and can process 5000 requests per second
What kind of hardware and web server setup you need for 5k/s is something out of my league, and very challenging. For instance the absolutely smallest likely web response, even if a static text file, is one Ethernet packet (~1,500 bytes) then 5k/s works out to 60 megabits per second in bandwidth alone (ref). What you're talking about is expensive -- in terms of money to run and time/intellectual effort to build.
May
15
comment Seeking web service that returns elevation profile between two points and can process 5000 requests per second
dem tiles: A DEM is just a specialised kind of raster. Starting points would be gdal2tiles.py and gdal_retile.py for building the dataset. Any gdal ogr -using map server should be able to read the result.
May
15
comment Exploring ArcObjects through C# or VB from Python background
related: Guidelines for using ArcObjects from Python
May
15
comment ArcObjects/Python: Add JPG to layout
excellent answer. Please consider recasting (without duplicating) for gis.stackexchange.com/questions/129456/…
May
15
comment How to interpolate points along a line in Python for ArcGIS 9.3?
@Damon I would link to your identical answer on the other thread as a comment to this question here, and then delete this answer. (and thanks for the code sample too! useful for me today)
May
15
comment Running Model From Catalog Menu?
It's too hard to read the diagram. However my hunch is that when run from ArcCatalog it's not using or reading from the layer file on disk. It looks like you have 2 fairly discrete processes. As a troubleshooting step, I would save each one into a different model, and then run one after the other. Repeat until exact location of error is found.
May
15
comment Seeking web service that returns elevation profile between two points and can process 5000 requests per second
Those are very specific and very demanding numbers without context. If those numbers are real, you're going have to satisfy the ultimate aim a different way, it's trying to buy the moon with a penny. Google's Elevation API limit is 10 requests per second for paying customers, developers.google.com/maps/documentation/elevation/#Limits. Also see api4dev.com
May
15
comment How to set feature vertex Z from an intersecting feature's Z?
@Hornbydd, not at present but I can ensure there is if that's necessary or makes it easier.
May
14
comment How to set feature vertex Z from an intersecting feature's Z?
@radouxju red line has constant Z, blue line does not. Red line should be read-only and unaltered by the operation.