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Questions tagged gis

29 questions

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9
votes
2
answers

How to clip WorldMap with polygon in R?

r gis polygon crop clip
asked 2013-04-08T14:14:55.117
8
votes
1
answers

Separate GIS points into groups of points that are close to each other

postgresql gis postgis
asked 2012-10-26T12:52:55.190
18
votes
1
answers

How can I handle an "orphaned hole" in a polygon shapefile in R or ArcGIS?

r overlay gis polygon
asked 2012-07-11T12:51:09.770
22
votes
5
answers

How to use Google Maps API in leaflet-cloudmade

google-maps gis leaflet
asked 2012-06-17T05:15:47.597
8
votes
1
answers

Augmented Reality Bearing/Heading/Azimuth confusion. (iphone ARKit code)

iphone math gis augmented-reality
asked 2012-03-13T08:51:39.563
22
votes
5
answers

ST_DWithin takes parameter as degree , not meters , why?

postgresql gis postgis srid
asked 2011-12-09T11:23:22.417
29
votes
4
answers

Spatial data with mongodb or cassandra

mongodb cassandra gis geohashing
asked 2011-10-26T13:59:09.650
12
votes
1
answers

Georeferenced subgraphs / clusters with Graphviz

gis graphviz
asked 2011-10-03T17:49:12.263
16
votes
3
answers

How to convert polygon data into line segments using PostGIS

sql postgresql gis postgis
asked 2011-09-29T10:01:02.777
16
votes
2
answers

Calculation of accumulation area

c++ c delphi gis
asked 2011-04-26T11:55:13.533
30
votes
3
answers

Can R be used for GIS?

r plot gis ggplot2 raster
asked 2011-04-22T15:36:28.487
19
votes
4
answers

How do I convert kilometres to degrees in Geodjango/GEOS?

python django gis geodjango
asked 2011-03-07T08:18:38.393
9
votes
4
answers

Poor Performance when using Spatial Indexes in MySQL

mysql database performance gis spatial
asked 2011-01-21T11:15:24.570
15
votes
3
answers

How to convert a GEOS MultiLineString to Polygon?

python gis polygon multilinestring geos
asked 2010-06-03T09:44:11.033
35
votes
3
answers

How do I convert a latitude/longitude pair into a PostGIS geography type?

database postgresql gis postgis
asked 2010-03-26T13:31:59.920
10
votes
3
answers

Why is this bearing calculation so inacurate?

java gis precision double-precision
asked 2010-02-09T22:11:46.923
38
votes
6
answers

Get altitude by longitude and latitude in Android

android geolocation gis android-mapview
asked 2010-01-03T19:30:26.113
13
votes
3
answers

GIS spatial functions in PHP?

php gis
asked 2009-12-21T12:26:30.617
55
votes
7
answers

How to intelligently degrade or smooth GIS data (simplifying polygons)?

algorithm geometry gis postgis
asked 2009-12-04T21:59:44.990
37
votes
4
answers

Geographical boundaries of states/provinces -> Google Maps Polygon

google-maps coordinates geography gis
asked 2009-11-28T23:49:09.097
27
votes
8
answers

Calculating area enclosed by arbitrary polygon on Earth's surface

math geometry gis geography
asked 2009-08-27T10:36:16.593
11
votes
4
answers

General Address Parser for Freeform Text

algorithm parsing gis street-address
asked 2009-06-04T21:15:11.753
22
votes
7
answers

Algorithm for finding nearby points?

algorithm gis partitioning distance linear-algebra
asked 2009-05-08T05:20:01.283
11
votes
3
answers

How to approximate a vector contour from an elevation raster?

java math vector 2d gis
asked 2009-02-10T18:02:48.583
15
votes
10
answers

Is there a GIS "Hello World" Equivalent?

gis geospatial
asked 2009-01-09T19:30:12.970
22
votes
5
answers

Get street address at lat/long pair

iphone web-services gis geocoding street-address
asked 2008-10-01T16:38:55.903
69
votes
10
answers

Is there an efficient algorithm to generate a 2D concave hull?

algorithm geometry 2d gis concave-hull
asked 2008-09-17T14:04:45.880
13
votes
6
answers

Similarity between line strings

sql-server algorithm gis
asked 2008-09-15T12:49:01.710
24
votes
9
answers

Map Routing, a la Google Maps?

google-maps google-maps-api-3 mapping gis
asked 2008-08-05T20:24:42.960