Software for which the original source code is made freely available and may be redistributed with or without modification.

learn more… | top users | synonyms

8
votes
1answer
485 views

Are Zonal Statistics possible in PostGIS2?

Now with postgis2 which supports rasters by default is it possible to do a zonal statistics analysis? I've google it but I haven't found anything solid? Is there a tutorial outthere to get me ...
8
votes
2answers
674 views

What are the Pros and Cons of hstore data type in postgis?

PostgreSQL has a module named hstore that implement the use of key/value pairs (it's something like the OpenStreetMap model, but in a single table). What are the Pros and Cons of hstore regarding GIS ...
8
votes
4answers
670 views

Preferred programming language and software for entire remote sensing workflow?

I have been involved in remote sensing for some years now during studies. I am wondering which combination of software and image processing modules would be most suitable for an entire process chain ...
7
votes
7answers
4k views

Extract raster values at points

How can I extract values from a raster by points. I prefer not in Arcgis. I prefer in Qgis or Mapwindow or other open source gis.
7
votes
5answers
2k views

Are there any .Net opensource library for geometry operations?

Are there any opensource librarys for doing geometry operations (union, intersect, relation...) in .Net?
7
votes
4answers
965 views

Spatial query tool for laymen

I know nothing about GIS, but I have what I think is a GIS problem. From spending a few hours googling my problem, I think what I need to do is perform a spatial query, but I'm not sure how to go ...
7
votes
5answers
9k views

Comparison of Open Source Desktop GIS Packages

I'm curious as to what comparisons are out there between different Open Source Desktop GIS software packages. I'm aware that there has been a QGIS and gvSIG comparison on this site but I am looking ...
7
votes
5answers
3k views

Large mosaic process failing - what are the options? software independent only focussed on result

I need to mosaic about 550Gb of tif imagery together and the software I have tried keeps failing. The area has been split into zones so that the smallest has approx 200 tiles. I have used the latest ...
7
votes
2answers
2k views

How to calculate average slope in a grid?

This is actually a two part question: Which methods are there to calculate average slope by unit (say km²) for a given area? Are there any special requirements on the data - like additional ...
7
votes
4answers
8k views

Alternative for ArcGIS for software development

I'm looking for a free and reasonably licensed alternative to ArcGIS (or maybe just ArcGIS server). I'm quite new to GIS, so I'll state some of the things I want to be able to do and you can tell me ...
7
votes
2answers
355 views

Is there an open source alternative to ArcGIS for Desktop's Integrate tool?

I need to snap about 1000 lines in one layer to the lines in another layer (there are about 5000 lines in the second layer). The lines to be snapped are about 15 map units away from the base layer ...
7
votes
3answers
646 views

How to script shapefile editing with open source tools?

I would really like not to disturb anybody and find my answer by a Google search, but I don't really know where to start. I have a .shp vector layer with several points on streets, each having a list ...
7
votes
3answers
1k views

Do any open-source .Net libraries (commercially usable) exist for reading/writing LiDAR data?

I have a few LiDAR point data (.las files) with me. I would like to read the X,Y and Z from it using .Net. I found liblas, which is in C++ and I am not sure if it can be used commercially after ...
7
votes
4answers
3k views

Anybody know any WMS clients for Android?

I am interested in finding a project (with source) for a WMS client for Android.
7
votes
2answers
985 views

How to animate raster time series using open-source GIS?

I have a bunch of rasters taken about 10 minutes apart, and I have a nice QGIS project that produces pretty enough maps of them. I'm wondering if there's a way to animate this raster series, with a ...
7
votes
3answers
1k views

How to interpret GRASS v.kernel results?

GRASS manual reads: v.kernel - Generates a raster density map from vector points data using a moving 2D isotropic Gaussian kernel ... Ok, but how do I interpret the results? I understand that ...
7
votes
2answers
989 views

Seamless, color balanced mosaics of aerial RGB photos with Open Source

I'm looking for an open source tool/workflow (even a command line one) to obtain what it is advertised in programs like http://www.inpho.de/index.php?seite=index_orthovista ...
7
votes
2answers
661 views

Are there GIS tools for simulating landscape fragmentation?

I am currently looking for any GIS packages (or add-ons) that allow the simulation of landscape fragmentation on raster data. Maybe also other software than GIS tools? Does anyone of you have had ...
7
votes
1answer
839 views

Open source engine that is similiar to ArcEngine

If I was to develop a mapping application to be a standalone windows app, is there an open source engine that is somewhat comparable to ArcEngine?
7
votes
2answers
1k views

For a given feature find the closest point along a given path

Looking for a Java based (foss4g) solution for the following: I am using a path along with a buffer to find features that are along the path. For each of the features returned I want to find the ...
7
votes
7answers
1k views

Examples of thematic mapping web services built with FOSS GIS

What are some current examples of web services serving thematic mapping based on free and open source software? The thematic mapping could be in the form of choropleth or point layers. It would be ...
7
votes
4answers
852 views

Looking for open source component to create PDF from WMS in a web application

I want to create a PDF from WMS in a web map application. Please can anyone recommend a robust component? I'd like free open-source under an relatively business-friendly licence (no GPL, BSD/MIT ...
7
votes
1answer
3k views

Is there a free and open-source MXD to SLD converter? [duplicate]

Possible Duplicate: How to edit or convert ArcGIS 10 layer style to a SLD’s file I'm trying to set up a web map server for one of the government agencies in my country. Server setup's done ...
7
votes
4answers
888 views

Is there an open source equivalent of ESRI story maps?

I am a french user, sorry for my spelling mistakes. I am currently interested by storytelling with Maps. ESRI offers a tool : this is a great example of what I am looking for. But I do not own ...
7
votes
1answer
284 views

Looking for free / opensource Lidar web viewer

I have lidar data which I want deploy my users using web viewer. I will probably hold the data in PostGIS (not sure yet). Is there good opensource/free lidar viewer that I can integrate with ...
7
votes
1answer
808 views

Visual Studio Lightswitch and spatial data

I'm looking for a way to handle spatial data (for instance geography data type in SQL Server 2008) in Visual Studio Lightswitch 2011. Preferably with an extension that can show data on a map. So far ...
7
votes
2answers
2k views

Does an open source alternative to ESRI's Image Server exist?

I noticed the default way to store imagery is by using a database in the open source world. I like ESRI's Image Server software because it removes the need for a database and makes backing up a lot ...
7
votes
1answer
126 views

Open source implementation of “feature density” algorithm

I'm working on a dataset of house searches - 1 polygon for each area in which people want to find a house from an online search tool. This produces many overlapping polygons. It would be great to ...
7
votes
2answers
2k views

Creating noise maps using ArcGIS for Desktop or Open Source Desktop GIS?

In a previous role I helped create Noise Maps for Northern England. The predicted noise levels was done using the IMMI package (which I can recommend) and the cartographic output was done in ArcMap. ...
7
votes
2answers
481 views

Looking for advice regarding solar potential applications

I have the task of looking into whether it is possible to build a solar potential application which would inform the user whether a roof is suitable for solar panels and a brief report about the ...
6
votes
6answers
3k views

Web-map with mouse-over effect

under photoshop, I have different layers, each representing a region and a background which the country. I would like to make an animated map for the web, that is when the mousse is over a region, it ...
6
votes
4answers
2k views

Open Source equivalent to Collector for ArcGIS to use with QGIS/PostGIS?

From my reading of the Esri web pages the Collector for ArcGIS is tightly tied to that platform. I would be delighted to learn that I am wrong about this. I have a strong interest in generic mobile ...
6
votes
3answers
4k views

Where do I find the ogr2ogr command for Mac OS X Lion?

I am looking for the equivalent of FWTools for Mac OS X, Lion. Is there anything I can easily install and get that command?
6
votes
7answers
2k views

Open source tool to convert a DEM to a 3D model

I would like to convert a DEM (Digitial Elevation Model) file (e.g. from SRTM) into a 3D model that I can then edit with regular 3D modeling tools (e.g. Meshlab/Blender/etc.). However I'm using Ubuntu ...
6
votes
1answer
899 views

Open Source solutions for building a Traffic Management System

I am trying to set an Open Source alternative to proprietry ITS (Intelligent Transportation Systems) The goal is to build a Traffic Management System for a middle size city center. Main requirements ...
6
votes
2answers
347 views

How to compute the routing through N addresses/coordinates?

I have a set of N coordinates (addresses). My goal is to compute the shortest driving route through the set of coordinates, where the algorithm (not the user) decides which of the N coordinates should ...
6
votes
4answers
2k views

Is it possible to create 3D dxf with OGR?

Does anyone know if it's possible to create a 3D dxf with OGR. I would like to assign our contour lines a z value and export them to dxf for some cad work. PS I know FME can do this, however I would ...
6
votes
2answers
855 views

FOSS method to split raster into smaller chunks

I have a raster (USGS DEM actually) and I need to split it up into smaller chunks like the image below shows. That was accomplished in ArcGIS 10.0 using the Split Raster tool. I would like a FOSS ...
6
votes
1answer
880 views

Spatial joins in OGR SQL

I have seen that OGR supports it's own form of SQL, I was wondering if it's possible to do spatial joins. Something like select all objects where one intersects the other. I did have a look around ...
6
votes
2answers
583 views

Are there open source solutions for travel demand modelling?

I'm looking for open source tools for travel demand modelling (eg The four-step UTMS). Preferably in a GIS environment. That works well with Qgis, Grass and Postgis. My question is not related to ...
6
votes
2answers
623 views

Which Open Source GIS application support Linear Referencing and Dynamic Segmentation?

I'm looking for an Open Source GIS application that supports Linear Referencing and Dynamic Segmentation for the development of a road inventory system. I already know about GRASS but I'd like to know ...
6
votes
1answer
2k views

Opening ArcGIS layer package in open source software?

It seems that ESRI introduced the layer package in ArcGIS 9.3.1. I have been provided with layer packages containing essential data, but do not have access to this software. Ideally, I'd like to ...
6
votes
2answers
857 views

Basic .NET mapping components?

Which .NET mapping components are currently available? Focus is on desktop use and fairly basic mapping of SHP files (thematics etc.), not the more advanced GIS functionality (reprojections, clipping, ...
6
votes
3answers
690 views

Can we use GeoExt Freely?

I want to know, can we use GeoExt freely? is there any need to purchase some license for using GeoExt ? Actually i am already working with free Open source tools (OpenLayers+GeoServer) for my webMap ...
6
votes
1answer
652 views

Open source location allocation modelling

I'm looking for open source tools for location allocation modelling (eg planning public health facilities). Preferably in a GIS environment. I know GRASS somewhat, but v.net.alloc doesn't seem to ...
6
votes
4answers
3k views

How to calculate polygon length and width using open source GIS?

How can I calculate the length and with of polygons using open source tools? By "polygon length" I mean the length of the longest line within the polygon (update: to be correct, I just need the ...
6
votes
2answers
314 views

What are my options for Server side clustering using open source GIS tools?

I need to make a webapp that will show over 40K Points on a map. These points are all across the globe. Using WFS Service and OpenLayers, it is possible to do clustering on small set of points, but ...
6
votes
4answers
888 views

Postal areas for Germany? - Shape?

does anyone of you know how and where I can download postal area districts of Germany in shape files (download free of charge if possible). best regards desputin
6
votes
1answer
943 views

Open source tool for point/node conflation/matching?

The Question Are there any open source tools for conflating (matching) two layers of point (node) data? Motivation I'm particularly interested in using such a tool to sync data with OpenStreetMap, ...
6
votes
1answer
383 views

Is there a GeoDjango tutorial for GeoRSSFeeds?

I'm going through GeoDjango basics right now. Ideally, I'd like to publish a GeoRSS from a set of data I have that is already in Django's database. I know how to get a regular Feed working, but when I ...