User underdark - Geographic Information Systems Stack Exchange

underdark

Moderator

Member for 13 years, 4 months
Last seen more than a month ago

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GitHub
anitagraser.com
Vienna, Austria

61 Questions

Score Activity Newest Views

62 votes

12 answers

9k views

Visualizing speed of movement on static (= printable) map?

asked Oct 20, 2010 at 8:42

44 votes

12 answers

5k views

Seeking top tier conference in GIScience?

asked Jun 29, 2013 at 12:56

35 votes

7 answers

2k views

Statistical tests for spatial line patterns?

asked Jun 10, 2017 at 18:55

32 votes

6 answers

18k views

Maximum number of point features in an OpenLayers vector layer

asked Apr 23, 2011 at 13:00

32 votes

6 answers

4k views

Are there open source alternatives to ArcCatalog?

asked Aug 29, 2010 at 23:31

28 votes

3 answers

27k views

Is there a dissolve function in PostGIS other than st_union?

asked Aug 23, 2010 at 0:24

27 votes

3 answers

2k views

Are ellipsoids a mathematical necessity?

asked Mar 7, 2013 at 7:02

26 votes

4 answers

12k views

Is there an open source GIS to view and edit CityGML models?

asked Aug 15, 2011 at 12:19

25 votes

5 answers

4k views

How to simplify a routable network?

asked Jul 19, 2011 at 8:16

19 votes

4 answers

7k views

Creating one-sided buffers or parallel lines in PostGIS?

asked Aug 15, 2010 at 21:22

19 votes

7 answers

3k views

Fastest way to spatially join a point CSV with a polygon Shapefile

asked Jul 25, 2011 at 16:36

18 votes

3 answers

2k views

Clustering undirected lines

asked Jan 4, 2017 at 20:41

18 votes

9 answers

7k views

Which Tools do you use for Classification of Remote Sensing Data?

asked Nov 5, 2010 at 8:26

16 votes

2 answers

7k views

How to calculate average slope in a grid?

asked Aug 29, 2010 at 23:23

15 votes

5 answers

33k views

Seeking free elevation data for Europe?

asked Sep 7, 2010 at 16:39

15 votes

1 answer

3k views

Defining Winkel Tripel in proj 4.8.0?

asked Apr 9, 2012 at 16:08

15 votes

3 answers

2k views

Which CRS would you use to georeference historical world maps?

asked Mar 30, 2013 at 13:24

15 votes

4 answers

11k views

How to efficiently access the features returned by QgsSpatialIndex?

asked Jan 15, 2015 at 18:09

14 votes

4 answers

1k views

How to extract a small area from a big GTFS feed?

asked Nov 28, 2016 at 15:30

13 votes

2 answers

3k views

How to change a project variable using Python?

asked Apr 12, 2016 at 12:26

13 votes

2 answers

6k views

How to toggle layer visibility in QGIS using Python?

asked Sep 5, 2010 at 23:28

13 votes

4 answers

1k views

How to create spatial tag clouds or "tag maps"?

asked Dec 13, 2010 at 13:01

13 votes

3 answers

3k views

How to interpolate GPS Positions in PostGIS

asked May 16, 2011 at 18:38

13 votes

4 answers

21k views

How to overlay lat/lon points on a Google layer in OpenLayers 2?

asked Apr 15, 2011 at 21:36

12 votes

2 answers

4k views

How to filter big datasets in Geoserver WMS?

asked Sep 1, 2010 at 20:51

12 votes

1 answer

10k views

How to resample a batch of rasters using OGR/GDAL?

asked Sep 7, 2010 at 10:30

12 votes

4 answers

1k views

Point Pattern Analysis Algorithms

asked Jul 25, 2010 at 13:53

12 votes

2 answers

7k views

How to compute Straight Skeletons using Python?

asked Feb 20, 2015 at 11:46

11 votes

14 answers

14k views

Which GIS support DXF and/or DWG?

asked Sep 4, 2010 at 8:32

11 votes

4 answers

11k views

What causes shiny artifacts in Google Maps imagery?

asked Feb 28, 2011 at 17:05

1