1,364 reputation
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location South Africa
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visits member for 2 years, 6 months
seen Dec 9 at 10:24

Oct
17
asked Delete polygon underlap?
Oct
3
awarded  Popular Question
Jun
28
awarded  Yearling
Jun
14
awarded  Nice Question
Jun
6
accepted How to prevent data scraping in a web map?
Jun
6
comment How to prevent data scraping in a web map?
Thanks Russel, I think that a combination of a strongly worded legal statement (mileage may vary) and this approach will probably work in this case. I found a useful tutorial at SWITCH2OSM
Jun
6
comment How to prevent data scraping in a web map?
Mapperz, obfuscating the javascript would be useful for protecting the programming logic (which is not needed in this case), but my understanding is that the data will still be easily copied. At least this is my conclusion from testing an online obfuscator.
Jun
5
comment How to prevent data scraping in a web map?
I always appreciate your creative solutions, whuber. In this case it's probably not quite what I need (points should be clickable with popups) but there might well be other scenarios where this would be worth pursuing.
Jun
5
asked How to prevent data scraping in a web map?
Apr
19
awarded  Nice Answer
Apr
19
revised How to rename field names in a shapefile from the commandline?
fields -> field names
Apr
19
asked How to rename field names in a shapefile from the commandline?
Apr
19
answered How to rename field names in a shapefile from the commandline?
Apr
16
awarded  Caucus
Mar
28
comment Getting Transparent Circles with Heatmap Plugin
Here's a useful explanation of why it's not recommended to do analysis in Pseudo Mercator (also known as Web Mercator): blogs.esri.com/esri/arcgis/2010/03/05/… If you are only after the "heatmap effect" and not worried about the spatial meaning (x points within kernel radius), then you can get away with generating heatmaps with data in EPSG:3857 projection. If those numbers are important, then it's best to reproject.
Mar
28
comment Getting Transparent Circles with Heatmap Plugin
I'm glad you got it working! I usually do it this way: 1) load the points as WGS84, 2) save that layer in a UTM projection (if the area fits within one UTM zone, otherwise some appropriate local projection). 3) create the heatmap using the projected points as input 4) reproject resulting heatmap to pseudo mercator using raster warp 5) load openlayers. You shouldn't have any alignment problems that way, and you're not doing analysis in pseudo mercator (which can lead to distortion errors).
Mar
26
answered How to use ZonalStats plugin?
Mar
26
comment How to use QGIS Zonal Stats Plugin from Python Console?
@vinayan the QProgressDialog is useful for visual environments where you want to see how far the calculations have progressed. It has no use from the command line. You can use None as the parameter and it works fine. Then you don't need the from PyQt4.. line or the progressDialog = line. See similar post at gis.stackexchange.com/questions/23203/…
Mar
26
comment How to calculate raster statistics for polygons?
Thanks for your comment, Dan. My answer was missing a necessary import statement, which should now be fixed.
Mar
26
revised How to calculate raster statistics for polygons?
added import statement