Questions tagged [open-source-gis]

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

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20
votes
11answers
49k views

Extracting raster values at points using Open Source GIS?

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.
35
votes
12answers
11k views

Seeking alternatives to pgRouting for open source routing / network analysis?

I was wondering if there are any alternatives to pgRouting tools. Thinking about it for a bit, I think the only alternative is to use R or RPY to do the analysis. Basically I'm trying to solve ...
10
votes
5answers
12k views

Clipping LAS data using shapefile polygons and open source software?

I am trying to clip or filter lidar files (.las, .xyz) using a shapefile that contains multiple polygons. Is there open source software that can do this spatial operation? My .las files are enormous,...
35
votes
5answers
43k views

Comparing different open source GIS servers?

I currently know the following open source GIS servers: Geoserver: java based, vector and bitmap support, also supports. Is now on par with mapserver (performance-wise). mapserver: c/c++, used to be ...
55
votes
10answers
40k views

Creating drive time polygons using Open Source tools?

Is anyone using open source tools and/or data to generate drive time polygons that radiate out from a given location? For example, I have used ESRI products like Network Analyst and Business Analyst ...
142
votes
42answers
18k views

What free programs should every GIS user have installed?

Note: This question is specifically about installed, desktop software. There is another question specifically about free cloud-based software and services. What free programs should every GIS user ...
20
votes
11answers
5k views

Discontinuous or Interrupted map projections?

Do any of the current open source GIS softwares support discontinous projection systems? E.g. sinusoidal, dymaxion, butterfly, etc? If not, are there any affordable commercial ones that do (affordable ...
18
votes
5answers
7k views

Splitting raster into smaller chunks using GDAL?

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 ...
14
votes
3answers
8k views

Land Cover Feature Extraction from Satellite Imagery

I'm interested in a low-cost or open source solution for creating land cover GIS layers that utilize both spectral and textural extraction algorithms. I have used PCI Geomatica, ENVI, and Feature ...
18
votes
4answers
13k views

Free GIS software for orthorectification?

Could someone recommend a free and/or open source GIS application that can orthorectify map images?
58
votes
11answers
47k views

Seeking Free and Open Source GIS Desktop packages?

Can someone give me a list of free and open source GIS desktop packages?
49
votes
4answers
4k views

What are the FOSS equivalents to these ArcGIS products? [closed]

I'm a long-term user of ESRI software, and I now have a need to use free and open source software. I've been reading about OpenLayers, PostgreSQL, PostGIS, GeoServer and MapServer but I can't find a ...
25
votes
12answers
27k views

Working with LiDAR data using other than Esri software?

I will be working with LiDAR data soon and I am wondering what the alternatives to using Esri software to do this are, including open source solutions?
24
votes
8answers
34k views

Seeking open source Geocoding tool which can be used commercially?

Is there any Geocoding tool which is open source and can be used in commercial application? We tried Google geocoding API's but cannot continue with it because of some licensing limitation. Now ...
26
votes
6answers
13k views

What is Change Detection and how I can perform such analysis with open source tools?

From wikipedia page: Change detection for GIS (geographical information systems) is a process that measures how the attributes of a particular area have changed between two or more time periods. ...
16
votes
4answers
8k views

Calculating elevation profile along line from a DEM?

Given a DEM (Digital Elevation Model) and a line (x1,y1) --> (x2,y2) (paired coordinates (x,y)), how can one calculate the elevation profile or cross-section projected on that line? I am looking for ...
42
votes
9answers
25k views

Open source methods for kriging?

I have a point dataset which I'd like to Krige, ideally using an open-source software package. If possible, I'd also like to choose the semi-variogram model during the process to improve the ...
25
votes
12answers
20k views

Seeking open source software package for Remote Sensing?

Here are many questions with great answers about open source GIS software. I am wondering, what is the best open source software package for Remote Sensing? I would like to learn it and to use in my ...
12
votes
5answers
3k views

Seeking Open Source ISO Metadata Editor?

I am looking for a free open source ISO metadata editor for the development of an enterprise database. It will mostly be used for documenting shapefiles and GeoTIFFs. Hoping that it will be an ...
10
votes
4answers
1k views

Suggestions for simple mapping platform for alumni web site

I'm working on a proof of concept alumni site with a WordPress backend. I want to have a very simple map that shows where alumni are living. I'm thinking something like the Bing API or a simple open ...
33
votes
10answers
6k views

How to easily shift all features in a vector dataset?

Let's say that I put together a Shapefile and all the features have their vertices shifted by a constant amount. What's the easiest way of shifting all the features (hence the (x,y) position of their ...
10
votes
3answers
15k views

3D visualisation with open source GIS software [closed]

I'm searching for QGIS (or other open source GIS software) tools that can analyse XYZ data. Also I'm interested to hear about if anyone have migrated to non commercial software regarding geological ...
6
votes
2answers
3k views

Open source solutions for Landsat-8 mosaicing and correction?

I am familiar with the major commercial remote sensing packages (ENVI, IDRISI ERDAS, etc), but I haven't previously had the opportunity to utilize open-source solutions. I have a several new Landsat-...
5
votes
1answer
5k views

Open Source Alternatives to ERDAS IMAGINE ATCOR?

I have been using ERDAS IMAGINE's ATCOR extension for ATmospheric CORrection of ASTER imagery. What opensource options exist for atmospheric correction of ASTER Level 1B products? I'm primarily ...
8
votes
2answers
1k views

Seeking open source alternative to ArcGIS 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 ...
1
vote
1answer
3k views

Delineate polygonal catchment areas from a raster using open-source GIS

I'm 90% sure this basic question has been asked before but looking through the other posts I simply do not see a useful answer. I need to calculate polygonal(vector) catchment areas from a raster ...
23
votes
5answers
4k views

Rendering overlapping lines

I am making a map containing information about public transportation: busses, trams, etc. The map will have a layer containing for example the tram lines. Each line has its own colour, and is ...
37
votes
10answers
30k views

Open Source Tool capable of reading Esri File Geodatabase (.gdb)?

I have an ESRI File Geodatabase (.gdb) file that I would like to convert to shapefile (or any other non-proprietary format). Are there any Open Source tools to do so?
27
votes
7answers
5k views

Alternatives to Network Analyst [duplicate]

I'm not sure how reasonable this question even is, but it leaves me no less curious after a bit of searching. If I am looking to build a network based on road features and attributes, is Network ...
9
votes
5answers
20k 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 ...
12
votes
10answers
6k views

Need a Benchmark GPS Trajectory data-set?

I'm looking for a benchmark GPS data set, available for research purposes for free. I've found GeoLife GPS Trajectories dataset from Microsoft Research but I find it a little incomplete. What I need ...
22
votes
5answers
12k views

A SQL console in QGIS

I know QGIS comes with its field calculator, which is not bad. It also comes with ftools which permits several operations on geometry and attributes. But we often need more control and I haven't seen ...
13
votes
3answers
10k views

Post processing GPS data with open source software

I am using Magellan Professional Mapper CX working on ArcPad 7.1 platform. It has sub-meter accuracy after post processing. Without post processing the data collected in the field is off by 10 to 15 ...
16
votes
4answers
4k views

Python module to delete SHP features (without Desktop GIS installed)

I have a piece of software (not Arc) that runs nightly on a non-production machine which updates shapefile features from an external database. Periodically I would like to delete all of the features ...
16
votes
4answers
10k views

Get all vertices of a polygon using OGR and Python

I'm having a little trouble with the Python OGR API. What I am trying to do is get all the coordinates of each vertex of the outer ring of a polygon. This is what I have so far: import osgeo.ogr ...
20
votes
7answers
3k views

Alternatives to Shapefiles as open-source, cross platform dataset types [closed]

I am working on software that is very ESRI oriented, but a future version will likely not be using ESRI software. It uses Shapefiles and Geodatabases. I'm planning on getting all of my data to ...
11
votes
14answers
12k views

Which GIS support DXF and/or DWG?

Which GIS support DXF and/or DWG (preferably read&write)? Update: Are there any open source GIS supporting these or similar CAD files? Support of CAD files generally seems to be problematic. ...
8
votes
4answers
3k 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 the contour lines a Z value and then export them to dxf for some cad work. PS. I know FME can do this, however I ...
7
votes
1answer
8k views

Setting transparency in an SLD file for a 4 channel GEOTIFF

I'm struggling to set the a background colour to transparent in an SLD file for a 4-channel GEOTIFF using GeoServer 2.1.4. I think I've set my background colour to transparent alpha layer in a ...
14
votes
2answers
5k 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 ...
2
votes
1answer
3k views

GRASS Geoprocessing in Python Script

I´m trying to get some GRASS geoprocessig tools running in a python script outside GRASS. I´m able to import grass.script, but I´m not able to get the tools running yet. Does anybody know what I´m ...
9
votes
0answers
3k views

Open source alternative to FME from Safe Software for Spatial ETL? [duplicate]

Just wondering if there is any open source solution which comes close to safe FME? I would like to integrate it into my workflow, but it´s just another few thousand which my employer has to give out ...
52
votes
3answers
17k views

Smoothing polygons in contour map?

Here is a contour map for which all the polygons of levels are available. Let ask how to smooth the polygons keeping all vertices preserved in their exact locations? Indeed the contour is made on ...
24
votes
6answers
2k views

What are some good introductory books or articles about Open Source GIS for students coming from an ESRI background? [closed]

I am preparing an intermediate GIS course for graduate and undergraduate students who have likely not been in touch with anything but ESRI software. It is an existing course in the curriculum that I ...
33
votes
7answers
4k views

Work flow for georeferencing imagery using open source tools?

Does anyone have a recommendation for a work flow for georeferencing high resolution aerial photography using open source tools? Comparison of user friendliness and robustness between Quantum GIS ...
14
votes
6answers
2k views

Creating simple image from vector data

Can anyone suggest a quick (and preferably open source) way to create an image from a shapefile. For example, I have a shapefile containing parcel boundaries, I want to create a png file depicting ...
31
votes
5answers
3k views

Are there open source alternatives to ArcCatalog?

I'm looking for open source alternatives to ArcCatalog. The software should run on both Win and Linux and support the usual file formats (shp, kml, gml, ...) and databases (especially PostGIS, ...
19
votes
4answers
2k views

How to generate schemas of GIS hardware / software / workflows?

Quite often I find myself in a situation where I need to explain hardware or software GIS infrastructure to people with no or limited knowledge of GIS. Or give an overview of geoprocessing tasks ...
15
votes
10answers
2k views

Seeking Open Source Training Materials?

The question Are Online Certs worth their weight? made me wonder if there are any open source training materials for GIS. By this I don't mean training specifically for open source software - of ...
9
votes
2answers
10k views

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

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. ...