Tagged Questions
0
votes
0answers
12 views
how to loop grass command in python and put variable in output file
anyone,
first day Grass programming with python scripting;
first prob;
simple I want to reclass the same raster several times;
and save the file with the value loop variable at the end ...
can not ...
0
votes
0answers
76 views
qgis plugin: “WindowsError: [Error 6] The handle is invalid”
OS: Windows 7 64bit
GIS: QGIS 1.8 (qgis.org/downloads/QGIS-OSGeo4W-1.8.0-2-Setup.exe)
path variable:
GISBASE=C:\Program Files (x86)\Quantum GIS Lisboa\apps\grass\grass-6.4.3RC2
...
0
votes
0answers
89 views
Help in GRASS/QGIS/Python
I have Idea about ArcGIS, and a bit of QGIS and zero programming knowledge, which I am trying for thesedays. I saw GRASS GIS and have started working with shapefiles, which are not being loaded... :( ...
3
votes
2answers
62 views
How do I tell GRASS where to find Python?
For some reason, when I start GRASS on my Mac it says that it has found Python 2.6.7. However, /usr/bin/python version is 2.7.2 and I can't find a lower version anywhere on my system. Potentially ...
0
votes
0answers
48 views
Why don't libgrass.so.1.8.0 and libqgissqlantconnection.so.1.8.0 load?
I have compiled Qgis 1.8 at Ubuntu 12.10, but some phyton plugins does'nt work, like sextante.
Trying to solve this problem, some files don't have been load. They are: libgrass.so.1.8.0 and ...
0
votes
0answers
43 views
How to begin with tool development for GRASS gis or QGIS GRASS
I wanted to begin with customized tool development in Grass GIS or QGIS grass. How should i begin in to develop the tool. I search a lot in google search engine for begin with tool development in ...
2
votes
1answer
62 views
Issue while running grass from subprocess
I have a map based web application using geodjango. I needed to display the crime hotspots within a selected polygon area. I found that v.kernel is very good for generating heatmaps/hotspots. So in my ...
4
votes
1answer
84 views
Programmatic raster-vector calculation
I currently use GRASS' r.mapcalc to find the difference between vector and raster data using a loop and temporary files and layers.
Is it possible to do the core calculation between raster with a ...
3
votes
2answers
57 views
Is there a workaround for GRASS i.maxlik 'class' being a keyword in Python?
I am running i.maxlik in python - attempting to automate a processing chain.
I use the command:
grass.run_command('i.maxlik', group= group, subgroup=subgroup, class='classification', sigfile = ...
1
vote
1answer
197 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
1answer
196 views
Is there a way to use ArcPy and PyGRASS tools in the same Python script?
I´m trying to write a Python script, that includes different ArcPy / ArcGIS commands and want to combine it with GRASS geoprocessing tools.
Unfortunately importing the GRASS libraries doesn´t work.
...
1
vote
1answer
136 views
Raster operation with grass.mapcalc
I need to iteratively add each raster map of viewshed analysis obtained from a series of single observer locations. For this i used grass.mapcalc with Python (GRASS 7 for Windows). However, my ...
2
votes
1answer
179 views
Integrated viewshed analysis
I need to do integrated viewshed analysis of a target with several observer locations. I am going to use r.viewshed analysis function in GRASS. With this function, it is possible to perform analysis ...
1
vote
1answer
52 views
Showing map in Grass Layer Manager/Map Display via Python
I've created some raster(tif) maps using Grass libraries in Python. I want to opem them automatically in Grass GIS Map Display or Layer Manager after creation. I don't want to use GUI for this. What ...
5
votes
1answer
158 views
How to call GRASS modules in pyQGIS?
I wish to use a Grass module (v.to.db) in QGis, without the grass toolbox.
I tried with the Python console, but to no avail :
Using Sextante plugin but obviously it didn't know all the grass ...
3
votes
2answers
182 views
Using 'gdalwarp' in Python script for Grass
I'm writing a Python script that aims to re-project various LANDSAT tiles into a common projection and then import the tiles into Grass. The script at present is shown below:
#!/usr/bin/python
...
2
votes
2answers
209 views
How to single out country data from a world data map?
Say that i have two "data sources";
A global map of average wind speeds,
A shape file (or similar information) of all country borders in the world.
How do i combine these two sources and extract ...
1
vote
1answer
337 views
Python script for GRASS - executing from PHP
I wrote the following python script:
#!/usr/bin/env python
import os
import sys
gisbase = os.environ['GISBASE'] = "/usr/lib/grass64"
gisdbase=os.path.join("PATH")
location=LOCATION NAME
...
2
votes
2answers
530 views
How to perform volume calculation in QGIS
EDIT 07/12/12
Ok, meanwhile I came to another problem I want to discuss.
I just tried around with the volume calculation with some layers and came to a point where I receive the following error.
...
1
vote
1answer
67 views
Is there a way to access ps.map in python?
i am wondering whether its possible using python interface to load layers and edit them in Print/Cartographic Composer without displaying, and finally export to PDF?
something that can be done via ...
1
vote
2answers
474 views
How to access vector coordinates in GRASS GIS from python?
Is there a way to iterate over lines and their vertices using python? I'm new to GRASS GIS, and it looks like there are ways to read raster (for numpy), but I don't see a direct way to access ...
5
votes
4answers
1k 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 ...
2
votes
2answers
336 views
r.mapcalculator and python again
I've been trying to write a script creating binary maps:
a=raw_input ("enter a threshold")
b=float(a)
grass.run_command('r.mapcalculator', formula="**'base_map'>=b**", outfile='map'+str(a), ...
8
votes
2answers
137 views
File naming for Enterprise GIS database?
I'm designing the guidelines for an Enterprise GIS database. Part of this database will include customized geoprocessing tools using a variety of software.
I'm interested in knowing whether anyone ...
2
votes
2answers
224 views
run r.stats as a quiet module in GRASS-Python script
Has anyone else used r.stats as a quiet module in a GRASS-python script?
As part of my program I'm using:
grass.run_command("r.stats", flags='l', input=<file>, output=<*.csv file>, ...
4
votes
1answer
99 views
Would it be possible to construct a stand-alone grass.script python package?
I would like to migrate dependency on ArcPy to grass.script without requiring the full installation of Grass. Would it be technically possible to have a portable directory containing grass.script and ...
1
vote
1answer
324 views
Win7 GRASS 7 & i.landsat.toar
Hello has anyone got experience running i.landsat.toar ?
The output files I get are empty, the command takes but a moment to complete. However when run in verbose mode all the calculations are done, ...
1
vote
1answer
367 views
How to create GRASS scripts in C# in Windows
Most of the tutorials that I have seen are under Python and Linux. Is it Possible to create GRASS scripts in C# or atleast in Windows. I can create scripts using a different language as a compromise ...
