New answers tagged grass
1
The proper way to set the -q flag in a GRASS-Python script inside a grass.run_command() is quiet = True. In the example given in the question (for grass64), that would be:
grass.run_command("r.stats", flags='l', input=<file>, output=<*.csv file>, fs=',', quiet = True)
Read also the GRASS-Wiki page GRASS_Python_Scripting_Library for examples.
0
I'm actually helping with AniMove plugin for QGIS, that aims to get rid on R dependence for kernel density estimation. Take a look here.
EDIT: The plugin is actually available as experimental in the official QGIS plugin repository
And don't hesitate to ask on the list, if you have any suggestion
0
Not sure if it will work for you, but can you create a topology with a sink at the end of the line in the direction you want the line to run?
1
The GRASS tutorial looks like the ticket. Following along your steps, are you converting the contours to raster somewhere between 1 and 4?
Last paragraph in the About section:
A number of the r.surf.* modules want the input data to be in raster
form already, so we rasterize the contour lines, using the level
column for the height values. Also some ...
1
Your question is poorly stated. It as at once general, as it asks if anyone has ideas about how to implement MFDs, and specific, as it seems to ask what is wrong with you code. I'll try to answer this second conceptualization of your question here.
You claim that the code you've posted is not optimized. I have rewritten the code below as I think you should ...
1
I'm guessing 16032 was referring to the GRASS modules in QGIS.
First: Interpolation
Then: Contours
0
In Qgis:
Raster>Grid/Interpolation
then
Raster > Extraction > Contour
1
Isn't it obvious that you need to install SAGA first? If SAGA is installed check in SEXTANTE settings if it is activated. Install python-saga module. Also check out this post on setup SEXTANTE for Ubuntu.
If none of this helps the reason may be that SEXTANTE is looking for SAGA modules in the wrong directory. The default path to SAGA algorithms is ...
0
They have a major difference on how they deal with vectors and this is very important:
GRASS has full/real topology support, that means that a single boundary can share several areas .
QGIS is primarily non-topological or "spaghetti" , adjacent area boundaries are duplicated.
And they relate in the way that Qgis can display and edit GRASS vectors through ...
8
GRASS is usually used for scientific purposes. So unless you want to do some sophisticated spatial analysis or routine, just stick with QGIS. Also GRASS works with its own formats so you will have to import/export data to exchange data with someone. Even if you will need sophisticated spatial analysis or routine at some point you will be able to do it with ...
0
Some GIS rather hide than show topological errors. In terms of GRASS GIS, you may want to check the related Wiki pages at http://grasswiki.osgeo.org/wiki/Topology . Note that the current GRASS GIS 7 development versions now makes suggestions for snap thresholds in order to assist the user to clean topological errors. Upon import it is also possible to write ...
0
If you use the dbf driver you can carefully use LibreOffice (or Open Office) to edit directly the dbf file... just be careful not to add/remove records.
0
Refer to my answer at http://gis.stackexchange.com/a/59566/17606 it might help. Fully agree with gm70560's points!
2
What do you use to extract contours from LiDAR data? Every how many meters are your contours?
If you start from a raster derived from the LiDAR data you could try to run a smoothing filter over the raster and then extract the contours: dangles and islands derive from sudden changes in heights (e.g.. sometimes outliers).
PS I know that running a smoothing ...
2
My favorite saying from one of my professors is, "Garbage in, Garbage Out." No matter the algorithm or method used, there will be no "magic button" that will fix a crummy dataset. Sometimes, the tools will make the data less accurate. No errors, but incorrect.
Each project you will work on will have different requirements. I don't feel a quick map made ...
1
Thank you for your reply and helpful information. I was actually able to track down the missing Python modules (importlib and psycopg2), and install them. The importlib module was available from here:
https://pypi.python.org/pypi/importlib
After downloading the module, it was simply a matter of running the setup.py file with the following command: ...
2
In the master version, the Sextante plugin is integrated into the application/bundle and may conflict with older versions installed in the .qgis folder.
There are daily versions, not stable by definition, which have errors that, often, are resolved in the next version, or not, and you have installed one of these versions .
One of the objectives of these ...
1
While I suspect a simple error in the setting of the Computational region, you can use r.univar to check the univariate statistic of each raster map in order to identify the map which causes the problems. With r.univar you'll see if any NULL data layer is present.
2
GRASS is written in C and have a ctypes python lib and recently an improved high level python library called pygrass. see pygrass documentation here. To work with raster data please refer to raster section of pygrass.
I would suggest you to start with python than using shell programming because all shell scripts are ported to python for cross-platform ...
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