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

learn more… | top users | synonyms

0
votes
0answers
49 views

Split polygon into four with respect to single point

Some days ago one of my colleague came to ask me a query related to Geometries. The situation is as....There is one Polygon(suppose a city polygon) and there is one point(suppose user's current ...
3
votes
1answer
59 views

How can I display GeoEye1 imagery in colour in Opticks?

Anyone familiar with the use of the open-source remote sensing software Opticks? Im new to opticks, I load GeoEye1 imagery but it displayed as greyscale. It supposed to be displayed as bands ...
2
votes
3answers
739 views

Workflow to convert a DWG CAD file to a shapefile

I'm trying to develop a workflow where I can convert a .dwg file to .shp. I don't have a good understanding of which tools I should be using. My preference is to use software that runs on OSX, is ...
2
votes
3answers
149 views

How to apply a specific Rendering to an Image and export to JPEG?

We have a specific process which generate an interpolated single band 32-bit Float Raster in Erdas Imagine (.IMG) format. This process generates an image every hour. We wish to apply a specific ...
0
votes
1answer
253 views

What are the equivalents of ESRI products in open source for Web Mapping? [closed]

I have been using the following licensed products to publish my GIS data on web. web server: windows 2008 R2, GIS desktop: ArcGIS desktop, GIS web server: ArcGIS server, API: ArcGIS API for JS, ...
11
votes
7answers
783 views

Free / Open source GIS Education sources

I'm looking for free / open source GIS education sources for advanced GIS users. Specifically sources that cover programming, spatial analysis, modeling, spatial databases / data management. I use ...
5
votes
1answer
181 views

Is there Open Source equivalent to ArcGIS Integrate (for topology correction)?

I need to transform a set of polygons so that it forms an exact spatial partition/tesselation (no gap - no overlap). What are the existing open-source solutions (software or library) to perform this ...
4
votes
1answer
271 views

Is there an online source of raw contour data?

My goal is to get a vector image (SVG preferably) of a local mountain. The data clearly exists, but as an armchair cartographer without access to raw layer data I've been reduced to combing the web ...
4
votes
2answers
143 views

pgAdmin vs psql

I have downloaded postgreSQl 9.3 and Postgis 2.1 recently as an educational adventure and have been working with both through the pgAdminIII interface. I haven't used psql yet when working with my ...
6
votes
2answers
902 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 ...
0
votes
2answers
141 views

FAHP/AHP for GIS in free software?

Anyone knows a free GIS software that implements the Analytic Hierarchical Process (or its fuzzy extended version) ? And while asking, have anyone had any experience with a commercial GIS that ...
4
votes
2answers
2k views

GPS Module Without Velocity or Altitude Limitations

I am looking for a GPS module that I can use in a high-altitude project. The problem I have discovered is that GPS manufacturers are required to place a set of restrictions on GPS modules. The ...
3
votes
4answers
5k views

How to calculate for every basin/sub-basin, drainage area at every elevation contour along stream?

With DEM as source, I created all necessary files like flow direction, accumulation,slope,streams,watersheds,pour point etc.... In my watershed(basin), I have many sub-watersheds(sub-basin) with ...
1
vote
2answers
50 views

How can I determine which polygons contain other polygons?

I am using only free, open source tools. I have two shape files: a shape file of voting precincts and a shape file of census tracts. I want to know: which voting precincts fit inside which census ...
2
votes
2answers
421 views

LANDSAT Image classification and open source solution(s)

I have some experience with ERDAS IMAGINE in doing some supervised/unsupervised LANDSAT imagery classifications and now find myself in the position of needing to do the same but without the access to ...
6
votes
2answers
661 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 ...
1
vote
0answers
82 views

How can I edit spatial data automatically on postgis and check for topology errors on said data whitout using shapefiles?

So, I have spatial data stored in postgis (points, lines and polygons) and would like to edit and update those in an Open Source software (quantum GIS, grass, etc.) to check for topologic errors, ...
7
votes
7answers
3k 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 ...
2
votes
3answers
1k views

Viewshed / Line of Sight analysis- as a batch process?

I wish to carry out a line of site analysis similar to the subject in here (preferably within QGIS): Visual Impact Assessment in QGIS or GRASS Scenario: I have two points, A and B. Point A is a ...
1
vote
2answers
158 views

How to get an indication of how points are spatially distributed?

Let's say I have a set of points and I want to get an indication of their spatial distribution. That is, if all points are at one location a possible return value would be 0, whereas if all points are ...
4
votes
2answers
860 views

how to convert UTM northing and longitude to latitude

I am doing some work with the Military Grid Reference System (MGRS), which is based on Universal Transverse Mercator (UTM). I find that I need to convert from UTM northing and longitude (actually, ...
0
votes
0answers
70 views

Best OpenSource Database to serve images on web?

I am using a mysql database where I store images as blobs. From here, I serve them on the web. Does anyone know if there is another opensource option that works better? I would need something to ...
5
votes
3answers
593 views

Are there any open source tools for the processing of UAV images?

I have aerial photographs taken by a Unmanned Aerial Vehicle (UAV). I want to do ortho mosaicing and DEM creation to do volumetric analysis. Are there any open source tools that process the UAV ...
2
votes
2answers
131 views

How can I share my own spatial data on an online map?

Note: I am very new in this field! Can I find an open source map that enables me to display an overlay of my own layers? I need to add some text and rectangles for a certain area, but my ...
1
vote
1answer
98 views

Is it a good idea to use GRASS Algorithms for Geoprocessing in a Server Environment?

I´m designing a web-service to run in a server environment that will do some geoprocessing actions to datasets uploaded by users and send the results back. I´m programming in Python, and so far I´ve ...
0
votes
0answers
91 views

Exporting basemap & Layers as an image?

I need a open-source server-side component for a web-application that can export basemaps + layers to an image format (saved on a db). Being slightly new to GIS, I've managed to find a few tools that ...
1
vote
2answers
240 views

Where to find Icon library for custom GIS software?

I am building a desktop application and currently utilizing a mix of icons for pan, select, zoom, attribute table, etc that have been randomly taken from the internet and modified. The overall look ...
2
votes
1answer
233 views

Open Source True Ortho Software

My work does true ortho rectification. We are looking to transition into a more open source company. One of the processes we are looking to "open source" is true ortho. Does anyone know of a ...
12
votes
4answers
5k views

free GIS software that can orthorectify?

Would someone care to recommend a free and/or open source GIS application that can orthorectify map images?
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?
0
votes
1answer
281 views

How to run Layer Stack in Batch Mode with GDAL?

My goal is process fifteen Landsat-8 scenes with three bands. I need to rescale the pixel depth from 16 bit to 8 bit, stack three bands and mosaic all them. This job must be making via open source ...
0
votes
1answer
227 views

Can I use google api or google maps in web application developed with arcgis api or esri technology?

I need to know that is it possible to use google map (as a basemap) and its GIS functionalities(like find/search features) in my web application developed with arcgis api for ...
5
votes
6answers
2k views

Open source/free software for generating a 3D view of mapping?

Is there any software that will generate a 3D view given a DTM/height data and raster mapping, and output an image in a printable resolution? I am looking for something similar to what you'd find in a ...
5
votes
3answers
2k 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 ...
1
vote
1answer
96 views

What tools or opensource library could I use to deal with LIDAR data(mobile laser scan data)? [duplicate]

I would like to do some reasearch job relating to automatic objects extraction along the road, like road markings, pole-like objects. I have to pre-process the original data before applying my own ...
0
votes
0answers
29 views

Selecting features through a many-to-one relationship

I want to select multiple counties based on the occurrence of a species present within them. I have a County polygon layer with CountyName as an attribute, a flat table called tblSpCnty with the ...
13
votes
6answers
2k views

Looking for free program, similar to 3D Analyst, to visualize tree stands in 3D

Heyho, I want to make a 3D stand visualization of trees in a specific area. I need something similar in functionality to ArcGIS 3D Analyst, but I don't have a license for that plugin anymore. The ...
4
votes
6answers
1k views

flex/AIR based SLD generator?

Styling layers in GeoServer can be tedious to say the least. While Styler can relieve some of that tedium, it doesn't yet work in chrome. It can wreck existing styles if not carefully used and still ...
14
votes
5answers
4k 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 ...
2
votes
1answer
264 views

Getting SAGA-GIS Python Bindings without compiling from source

I am very new to SAGA-GIS, but I recently developed a workflow using SAGA for processing LiDAR data. Now I need to batch the process using Python. I installed SAGA from the Windows installer and I ...
2
votes
1answer
89 views

Open Source + Offline Geo Notebook

I am looking for an open source offline software to record points of interest that I might visit at a later date. Let's say I am reading a book about Alaska, I'd like to take notes about interesting ...
0
votes
0answers
116 views

Calculating distances between boundaries of polygons with Python

I have two sets of shape-files which have to be worked on within a Python Script. Those two Shape Files might differ from each other (same thematic content, but 2 different epochs). If there occurred ...
23
votes
6answers
754 views

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

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 ...
0
votes
2answers
1k views

A script on this page may be busy, or it may have stopped responding

I'm using OpenLayers - 2.11,GeoServer 2.13, ExtJS 3.4, and Java for developing GIS based web applications. Recently i'm getting below error message in my application "A script on this page may be ...
2
votes
1answer
274 views

Are there Open Source alternatives to ArcGIS Aggregate and Extract Value to Points?

I am looking for some kind of Open source GIS library which can perform spatial analytic functions same as ArcGIS. My use case is : I am processing GeoTIFF file provided by USGS and performing ...
11
votes
4answers
3k views

Is there a Python Lib for requesting WMS/WFS and saving as image/PDF?

i am wondering whether there's Python open-source GIS lib which has APIs to support call WMS/WFS from another GIS server (e.g., GeoServer) and then save the response data(WMS Basemap and WFS layer) as ...
1
vote
1answer
73 views

Infrastructure networks in GIS modelling

I am currently working on a GIS-based project which aims to model the interdependency of existing infrastructure networks, e.g. transport, oil, pipeline networks, etc. The network interdependency ...
7
votes
1answer
309 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
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 ...
1
vote
1answer
37 views

Export layer with symbology with open-source tool

Similar to ArcGIS's "Layers", and "Layer packages", are there any open-source analogs? If I have a PostGIS table opened in QGIS (or GRASS, etc.), can I export it WITH the data, as well as with a ...