Stack Overflow
Stack Overflow

Questions tagged [gis]

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.

According to Wikipedia:

A geographic information system (GIS), geographical information system, or geospatial information system is any system that captures, stores, analyzes, manages, and presents data that are linked to location(s). In the simplest terms, GIS is the merging of cartography, statistical analysis, and database technology.

There is a Stack Exchange site devoted to Geographic Information Systems.

6555 questions
13
votes
3 answers

Adding vector map data to iOS GPS app. Real Time vector graphics rendering

We are working on a project to add vector map data from OSM and NAVTEQ to a iOS GPS app. Currently, the app displays raster map images and provides moving map navigation features. We now want to take it a step further by integration vector maps but…
user566401
  • 131
  • 4
13
votes
3 answers

How do I read my Google Location History in R

I found my Google Location History at https://maps.google.co.uk/locationhistory/b/0/?hl=en-GB I then downloaded the KML file I installed rgdal correctly but am unable to read the file I put the file name and layer name as from…
Ajay Ohri
  • 3,382
  • 3
  • 30
  • 60
13
votes
3 answers

How to convert a GEOS MultiLineString to Polygon?

I am developing a GeoDjango application where users can upload map files and do some basic mapping operations like querying features inside polygons. I recognized that users happen to upload "MultiLineString"s instead of "Polygon"s sometimes. This…
onurmatik
  • 5,105
  • 7
  • 42
  • 67
13
votes
2 answers

Direction between 2 Latitude/Longitude points in C#

I have 2 coordinates in Lat Long format. How do I determine from Point A (eg New York 37.149472,-95.509544 ) the direction in degrees to point B (eg Toronto 40.714269,-74.005973) I'm looking for a value like "340 Degrees" In C#
Ian Vink
  • 66,960
  • 104
  • 341
  • 555
13
votes
3 answers

GIS spatial functions in PHP?

I need to convert data points from one geographic projection (Lat Long, Mercator, UTM) to another and I wonder if there's a set of PHP tools or functions that can do this? I tried writing one myself based on formulas I found, but it wasn't accurate…
Reg H
  • 297
  • 6
  • 12
13
votes
7 answers

Where do you get ArcGIS development questions answered?

Where do you have the most success getting your ArcGIS development questions answered? ESRI forums? Stack Overflow? Google? Mailing lists? Blog posts? ESRI documentation? I can usually get answers to my ASP.NET/Oracle/JavaScript/C# questions in…
nw.
  • 2,206
  • 5
  • 30
  • 40
13
votes
2 answers

Data binning: irregular polygons to regular mesh

I have thousands of polygons stored in a table format (given their 4 corner coordinates) which represent small regions of the earth. In addition, each polygon has a data value. The file looks for example like this: lat1, lat2, lat3, lat4, lon1, …
HyperCube
  • 3,870
  • 9
  • 41
  • 53
13
votes
3 answers

Plotting discrete and continuous scales in same ggplot

I would like to plot some different data items using ggplot2, using two different colour scales (one continuous and one discrete from two different df's). I can plot either exactly how I would like individually, but I cannot make them work together.…
Simon O'Hanlon
  • 58,647
  • 14
  • 142
  • 184
13
votes
3 answers

Does anyone know of any good open source Geodjango apps to dig through?

I'm looking to build a small GIS in my spare time and have been digging into Geodjango. I've been trying to find examples of open source Geodjango projects to look through, but I have had little luck, so here I am. I've been through most of the…
Carter
  • 2,850
  • 9
  • 44
  • 57
13
votes
2 answers

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=FALSE); I then try to insert a row with a polygon: insert into tbl_test values(1, PolyFromText('POLYGON((0 0, 10 10, 10 0, 0…
Assaf Lavie
  • 73,079
  • 34
  • 148
  • 203
12
votes
10 answers

Designing a WPF map control

I'm thinking about making a simple map control in WPF, and am thinking about the design of the basic map interface and am wondering if anyone has some good advice for this. What I'm thinking of is using a ScrollViewer (sans scroll bars) as my…
Dylan
  • 2,392
  • 6
  • 26
  • 34
12
votes
2 answers

convert meters to latitude longitude from any point

In my project I have to find [latitude, longitude] coordinate(s) from one point in distance of 500 meters (this could be any random coordinate or an array of coordinates around my point). How can I do this? Note: I need this in order to find…
Zaur Guliyev
  • 4,254
  • 7
  • 28
  • 44
12
votes
10 answers

Finding Cities within 'X' Kilometers (or Miles)

This may or may not be clear, leave me a comment if I am off base, or you need more information. Perhaps there is a solution out there already for what I want in PHP. I am looking for a function that will add or subtract a distance from a longitude…
Kladskull
  • 10,332
  • 20
  • 69
  • 111
12
votes
1 answer

Georeferenced subgraphs / clusters with Graphviz

Sometimes I would like to overlay a conceptual graph on top of a map to provide additional context of where elements belong. For example, if I wanted to show social relationships between people in different countries, I might want to have the people…
Peter
  • 4,219
  • 4
  • 28
  • 40
12
votes
4 answers

Open Source/existing C# class to write GPX files? (C#)

I am looking for a C# library or class to help write GPX files from a collection of waypoints I have (lat/long, etc). I have found quite a few readers - but not so much for writing. Bonus points if it works on Compact Framework/WinMobile 6.5 - but…
Tim
  • 20,184
  • 24
  • 117
  • 214
1 2 3
…
99 100