GRASS GIS (Geographic Resources Analysis Support System) is a free, open source geographical information system (GIS) capable of handling raster, topological vector, image processing, and graphic data.

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61 views

Is d.mon xN deprecated in GRASS in favor of something in the wxGUI?

I'm trying to learn command-line GRASS (6.4.3) using the KyngChaos binaries on a Mac (10.8.4) from Neteler and Mitasova's book, Open Source GIS: A GRASS GIS Approach (3rd ed.). I've learned from this ...
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1answer
39 views

Error message starting gis.m in GRASS

I finally broke down and bought Neteler and Mitasova's book, Open Source GIS: A GRASS GIS Approach, because I need to learn command-line GRASS. On trying to work through the book's examples, I'm ...
0
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1answer
122 views

How to script map production in GRASS?

I'm trying to automate my production of maps with GRASS. What I want to do can be described in fairly generic terms: I have two layers (one vector, one raster), which will be identical in every map. I ...
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0answers
78 views

How to Configure sextante in Qgis 1.9 ubuntu

I am using Ubuntu 13.04 and the most up to date version of Qgis 2.1.0-Master. I am trying to get sextante to work correctly and have a hard time. Specifically SAGA 2.1.0 and GRASS 6.4.2 will not ...
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0answers
86 views

QGIS GRASS Rasteranalysis (r.los)

I want to determine the area around a wind turbine from wich the object is visible. I want to use r.los in GRASS i get this error: (German) r.los input=dgm@sichtbarkeit coordinate=534228,5406743 ...
0
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1answer
139 views

GRASS GIS related issues! [closed]

(1) How to create a multiband raster from a set of single band rasters (except when somebody talks about doing a r.composite). I attempted creating a raster3D and it turned out that it is not ...
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0answers
392 views

How do I change from lat/long to a metric coordinate system in GRASS?

Yes, it's yet another transformation question. I am working with ASTER DEM data, which is LatLong WGS84. I want to process the DEM map into an STL file for use in a CFD simulation. The script I am ...
0
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2answers
281 views

Why is this SRTM TIFF not visible in GRASS GIS 6.4.3?

I want to use interpolated SRTM data for Germany to generate an STL terrain map for use in a CFD application. My SRTM data comes from the OpenDEM project. SRTM data normally has voids, but this data ...
2
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1answer
43 views

Trying to extract arc information from a Suburb shapefile

I downloaded some shapefiles from the Australian Bureau of Statistics (ABS) Its basically showing a bunch of suburbs when I view the shapefile through a GIS tool. The GIS tool that I am using at ...
2
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1answer
55 views

Profile plot trouble in Grass GIS

I'm new to Grass and GIS environments in general, and I recently faced a problem when trying to get the profile plot from a DTM. When I draw the transect, instead of the plot, I get the following ...
5
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2answers
313 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 ...
1
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1answer
271 views

Create a 3D surface from xyz csv using GRASS

Apologies if this is a repeat question guys. I am trying to create a 3D bathymetry surface from xyz data. There is approximately 300,000 points with lat, long and z (depth data). The data is sonar ...
2
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4answers
479 views

Unable to load GRASS plugin

I upgraded from QGIS 1.7.0 to 1.8.0, including updating GRASS to version 6.4.3. Since then, GRASS isn't any longer listed in the Fetch Python plugins. I uninstalled and re-installed the whole package ...
1
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1answer
502 views

Using Landsat 8 for quantitative analysis - what DNs does GRASS require?

Hoping someone can short circuit a lot of exploration Landsat 8 values are stored as unint16 since the sensors work on a range 0 to 4096 whereas the L7+TM was 8 bit and had a digital number range 0 ...
1
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1answer
77 views

GRASS 6.4.3 Landsat processing

what are the pre-processing steps required for landsat etm+ with GRASS 6.4.3 prior to land cover change detection? The product used is L1T.
0
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0answers
53 views

Error Opening QGIS Lisboa Quantum Msys

I am deploying QGIS in our environment. I found the silent switch (/S) to be working, it installs the 4 default components, Grass, MSys, GIS Desktop & GIS browser. The trouble begins when a user ...
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0answers
27 views

suggestions for open source GIS in monitoring [duplicate]

my name is weng and i am currently conducting my research Entitled "Architecture for GIS based monitoring system for malnutrition" and one of the requirement would be to identify what open source GIS ...
1
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1answer
94 views

Importation of .csv on grass gis converts numeric data to string data

When importing a csv file on grass7, the numeric data is converted into a data of type string. My csv looks like this : id_core value 1 F1 83.0611472396 2 F2 98.8584345936 3 F3 ...
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1answer
51 views

How to edit a table in GRASS?

How do I edit a table in GRASS? When importing a vector into GRASS from QGIS, all the attributes are lost and I need these to continue with my analysis.
0
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1answer
67 views

GRASS has broken my terminal

I'm using GRASS on OS X. After installing GRASS I can no longer open my terminal to a prompt. On opening the terminal, the following line runs by itselt ...
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0answers
83 views

Covisibility with QGIS/GRASS : r.los issue

I try to use r.los for a viewshed calculation. I specify the dem (Aster DEM clipped on a 2km*2km region). I specify x and y coordinates and run the command. Nothing append. I waited for 20 minutes ...
2
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2answers
188 views

minimum distance from the shore (how to retrieve the “shore vertices”)

I am student of Statistics, this is my first time using GIS., I am sorry for the stupidity of the question but I browsed online and could not find a satisfactory answer. I have some spatial data in ...
2
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1answer
135 views

GRASS - v.clean Conflation - How to snap a layer to a base layer

Someone told me in this post that GRASS GIS can handle multilayer topology, what I have not found any information about. I am not a specialist of GRASS GIS so I would need help with that if its really ...
0
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1answer
182 views

How to batch merge rasters using FOSSGIS tools?

I'm working with QGIS 1.8 (gdal 1.9.2) and GRASS 6.4.3...but on Windows 7. I "just" want to merge my raster. I've got a folder with 50 GTiff raster from Lidar data. The aim is to merge raster ...
3
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2answers
91 views

GRASS v.rast.stats missing in sextante toolbox

I am new in the QGIS world and also with GRASS. I am really interested in using v.rast.stats as is doing exactly what I need. My problem is that I am not able to find it inside sextante in QGIS and I ...
0
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1answer
83 views

Problem with interpolation of 3D points in GRASS

I have a sample of 3D points (x,y,z) with tepmerature attribute. I can import my data as a 3D vector map. I want to create a volume of voxels by using v.vol.rst. When I use this module, this error ...
0
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1answer
90 views

Cannot import Grass in Console of Qgis (1.9.0 Master)

I can't import Grass in Console of Qgis (1.9.0 Master). I am guessing it is because of some Grass environment variables which are not set up correctly. However I don't understand why it is working ...
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2answers
76 views

Resolution difficulties in Grass

I have gone through similar questions to mine here, but I didn't find a solution. Please help! When cropping a raster image by using g.region & r.mapcalc, I get a new image but the resulting ...
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0answers
32 views

Why does install of add-on r.clump2 for GRASS 7 give error?

I am trying to install the add-on r.clump2 for grass7. What is wrong and how do I fix it?. Thanks The error code im receiving is the following: > (Fri Jul 5 15:13:42 2013) ...
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0answers
50 views

GRASS GIS SDTS Manipulation

Preface: I'm a total GIS noob. Flame away. I'm learning GIS in my free-time and with free resources. I realize that is likely going to force me on the learn-fast-or-giveup track, but here it goes... ...
3
votes
1answer
63 views

How to choose a GRASS kernel density function?

I'm starting to use the Grass module on QGIS, and I want to do a heatmap, so, I'm creating a new surface using the kernel function. But, GRASS come with 7 types of kernel functions, how do I know ...
6
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6answers
307 views

Tool/Algorithm for generalizing OSM-Files for printing maps

Is there a tool or algorithm to (topological) generalizes OSM-shapes? I would like to build a printable map in different scales. In the image below you can see the same divided road (yellow) at ...
2
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1answer
71 views

How to change the raster color range in GRASS NVIZ?

I'm trying to create a 3d map in GRASS NVIZ from a GDEM (raster) and the range of colors that show the height of the terrain are very ugly, how I can change them? For example, I would like the low ...
0
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1answer
66 views

Adding additional nodes to network in Grass GIS

I have created a network in Grass GIS (using v.net, nodes option). I then want to "disrupt" the network (i.e., create some road blockages) and add in nodes to the new line ends where road blockages ...
0
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0answers
135 views

problems with r.sun from GRASS

I´ve problems with r.sun from GRASS. I need to calculate beam radiation, reflect radiation and diffuse radiation wwith this tool. my problem is I do not understand that you have to put mandatory files ...
0
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1answer
66 views

Raster image outside Grass screen, How to get it inside from start?

HI ALL: I'm new in Grass and need some help! I have created a LOCATION based on the coordinate system in which I want my data to be projected. So far I'm being able to Import & display the raster ...
2
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3answers
733 views

How to pansharpen LANDSAT 8 in GRASS?

Having used QGIS for quite some time for mapping, I was 'forced' to dig into GRASS as pansharpening is not directly executable in QGIS. After understanding more or less the structure, I did some ...
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1answer
63 views

Is it possible to import/run AML script into GRASS?

I have an AML script that has instructions to import tmp files of (grid, network, basin...) is there any way to run the script in GRASS? I tried to converted to Python but I couldn't do it for the ...
1
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1answer
83 views

Use of Grass and R w.r.t. Land Use Prediction

In my data mining term project I need to conduct a work on geospatial data related to a big city to show possible urbanization fields in next years. I've used GRASS lately on other projects so I'm a ...
0
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0answers
11 views

How do I determine the area of a raster map in GRASS in real world units? [duplicate]

I know that in the metadata it gives you the number of cells, but how do you find out what area (in, for example, metres squared) a cell represents?
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0answers
52 views

GRASS 6.4.3RC3, Python script and windows7

I'm trying to solve my problem for a long time. I hope someone can help me. I'm not expert but I really want to istall 2 add-on on grass 6.4.3RC3 on my win7. The add-ons are r.basin and r.ipso. I ...
0
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0answers
54 views

Python errore addons (win)

I have this type of error when I try to use r.ipso: C:\Program Files (x86)\GRASS GIS 6.4.3RC3\extrabin\python.exe: can't open file 'r.ipso.py': [Errno 2] No such file or directory while with r.basin ...
0
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1answer
184 views

r.basin.py GRASS addon

I have added this add on with g.extension on my grass 6.4.3RC3. But it doesnt work... this is the error I can see: Traceback (most recent call last): File "C:\Program Files (x86)\GRASS GIS ...
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2answers
125 views

Grass 6 extension installation in Grass 7 error

I am trying to install the extension r.roughness from the Grass 6 repository, but in Grass 7. When trying g.extensions, the error "make: * No rule to make target ...
0
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0answers
59 views

SEXTANTE v.to.rast.attribute issue in script

I'm trying to convert a vector layer to a raster by using the GRASS function v.to.rast.attribute in Python. My code doesn't throw any error but the raster image is only a square of 1px. But when I'm ...
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1answer
116 views

Add-ons on GRASS (win7)

Can someone help me to install an add-on for GRASS 6.4.3RC3, on Windows 7? I tried several approaches, but wasn't able to install the add-on. I found several topics here and on the web but the ...
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0answers
114 views

How can I calculate raster cell area for upslope contributing area

I am new to spatial analysis, and urgently trying to follow this tutorial to generate a topographic wetness index for my area of interest: ...
4
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1answer
191 views

R gridding and contouring options

I want to make an interactive web mapping application, which will grid and contour user data. My plan is to implement R scripts with Shiny, but the only R package I can find to do this is gstat. And ...
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0answers
30 views

How to access layer attributes using grass network tools (v.net.iso)?

I had a quick look for a similar question, sorry if this is a duplicate. I am using GRASS 6.4.3 on windows - osgeo4w version I ran v.net.iso to split my road network by cost however when I try to ...
0
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1answer
122 views

How to setup and use GRASS?

Previously I've asked an question and Micha gave me a helpful advice:How to find the watershed area for each point in the river network using DEM? After getting the useful DEM file, I began to setup ...