Top "Gis" questions

A Geographic Information System (GIS) captures, stores, analyzes, manages, and presents data that are linked to location(s). The GIS Stack Exchange should be considered for questions with this tag.

Python, GEOS and Shapely on Windows 64

When trying to install Shapely on my Windows 64bit computer, I cannot get the GEOS library to work. So far, …

python gis geospatial shapely
Good examples of MapServer / OpenLayers

I want to convince some clients to use MapServer and OpenLayers. Please can anyone suggest attractive websites to show off …

mapping gis openlayers mapserver heatmap
How to intelligently degrade or smooth GIS data (simplifying polygons)?

I have detailed US county maps, from the TIGER LINE data sets. How might I sample, smooth, or degrade the …

algorithm geometry gis postgis
SQL query for point-in-polygon using PostgreSQL

I have the following simple table: CREATE TABLE tbl_test ( id serial NOT NULL, poly polygon NOT NULL ) WITH (OIDS=…

sql postgresql gis rdbms postgis
Is there an efficient algorithm to generate a 2D concave hull?

Having a set of (2D) points from a GIS file (a city map), I need to generate the polygon that …

algorithm geometry 2d gis concave-hull
How to calculate dice coefficient for measuring accuracy of image segmentation in python

I have an image of land cover and I segmented it using K-means clustering. Now I want to calculate the …

python-2.7 scikit-learn gis image-segmentation
How to convert degree minute second to degree decimal

I receive the latitude and longitude from GPS with this format: Latitude : 78°55'44.29458"N I need convert this data to: …

python parsing gis
sp::over() for point in polygon analysis

I have a shapefile named "ind_adm" and a SpatialPointsDataFrame called "pnts". The "pnts" contains points generated at random, and …

r gis polygon shapefile
Scaling marker size with marker icons from a sprite in Google Maps API v3

I'm playing with the Google Maps API (v3) and I've run into an issue with marker icons. I'm trying to …

javascript image google-maps google-maps-api-3 gis
How to get list of points inside a polygon in python?

I searched a lot and cant find any practical answer to my question. I have a polygon. For example: [(86, 52), (85, 52), (81, 53), (80, 52), (79, 48), (81, 49), (86, 53), (85, 51), (82, 54), (84, 54), (83, 49), (81, 52), (80, 50), (81, 48), (85, 50), (86, 54), (85, 54), (80, 48), (79, 50), (85, 49), (80, 51), (85, 53), (82, 49), (83, 54), (82, 53), (84, 49), (79, 49)] I …

python algorithm gis polygon fill