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.

Shapefile with overlapping polygons: calculate average values

I have a very big polygon shapefile with hundreds of features, often overlapping each other. Each of these features has …

gis postgis shapefile polygons arcmap
Algorithm for finding nearby points?

Given a set of several million points with x,y coordinates, what is the algorithm of choice for quickly finding …

algorithm gis partitioning distance linear-algebra
How can I get my contour plot superimposed on a basemap

This is a question I asked several months ago and am still struggling to come to a solution. My code …

python matplotlib pandas gis matplotlib-basemap
How can you edit the objectID of a row in an ArcGIS geodatabase?

I am trying to add a row to an ArcGIS geodatabase but I don't want an automatic objectid to be …

database insert gis arcgis esri-arc-engine
C# WPF resolution independancy?

I am developing a map control in WPF with C#. I am using a canvas control e.g. 400 x 200 which …

c# wpf gis resolution dpi
Error when mapping in ggmap with API key (403 Forbidden)

I normally use ggmap to plot points on a simple city map. When doing this today I came up on …

r ggplot2 gis ggmap
sql geography to dbgeography?

Maybe I'm missing something. I have a sql server column of the "Geography" datatype. I want to use the DbGeography …

sql-server c#-4.0 gis geospatial spatial
python: perform gdalwarp in memory with gdal bindings

I currently have a processing chain in R which downloads MODIS data and then calls gdalwarp from the system to …

python gis gdal
How to choose between MongoDB and PostgreSQL for GIS?

I'm trying to find some information on this topic but most articles I'm finding are 3+ years old. I am also …

mongodb postgresql gis postgis database
rgdal / readOGR - unable to read shapefile from .zip

I'm trying to load a zip level shapefile to do some plotting, per: https://github.com/hadley/ggplot2/wiki/plotting-polygon-shapefiles …

r ggplot2 gis rgdal