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1

To reduce the memory footprint of v.to.rast with large maps, set in v.to.rast the parameter: rows=value to a value much less than the default 4096.


-1

I highly recommend to use the stable version of Grass (i.e 6.4.4.1). Regards,


2

I'm not sure about NVIZ. I would suggest, as an alternative, you look at another QGIS plugin called Qgis2threejs [https://plugins.qgis.org/plugins/Qgis2threejs/]. It can produce higher resolution 3D images than the examples loaded above. See these blogs: http://anitagraser.com/2014/03/15/3d-viz-with-qgis-three-js/ ...


1

I think this question has been largely answered except for a couple of points about the issues. Heat maps can be great, but a classic flaw and issue lies with interpretation. Take the difference between a heat map of crime events compared to a map (heat or otherwise) of crime rate/proportion. While the event heat map might be useful in terms of identifying ...


0

Perhaps you haven't set computational region correctly? Try running g.region before r.mapcalc: g.region rast=DEM This makes the computational region match the extent of your map DEM. See also: http://grasswiki.osgeo.org/wiki/Computational_region


1

GRASS 7 is still in a beta release stage. The Kyngchaos.com package is a stable release of QGIS, which does not yet include GRASS 7 internally. You can get a copy using the Homebrew package manager and the OSGeo4Mac tap: Install Xcode, Xcode Command Line Tools and Homebrew Then, in Terminal run: brew install osgeo/osgeo4mac/grass-70 (if your ...


0

To get distances in meters, project the data. How to do that is a mechanical issue readily resolved by referring to the software manuals. The harder part of the question concerns what projection to use? Because a comment to the question indicates that North America is the region of interest, the shape of this continent--and the situation of its coastlines ...


1

In spite of what it says in the GRASS manual for v.distance, units are the same as the units of the coordinate system, so in a lat/lon coordinate system you will indeed get decimal degrees. In the GRASS 7 manual the above (incorrect) statement is missing. On the other hand, if you create a Spherical Mercator based LOCATION, EPSG 3857, as you mentioned, the ...


0

You want your data projected into Meters, which you can project in GRASS or use QGIS to do that - North_America_Albers_Equal_Area_Conic projection EPSG 102008 would work for North America, for example. Then I'm not sure if you can have data in multiple coordinate systems in 1 workspace, or if you should create a new workspace in EPSG: 102008 to store your ...


0

can you help me? I'm trying to modify the plug-in QuickEsport! if possible should be exported to PDF, not only the attribute of the "dbf" the pictures!


4

You can call r.mapcalc in for loop. In shell it could look like this: X=5 # initialize first map r.mapcalc "old = 10" # loop for I in `seq $X` do r.mapcalc "new = old + 10" --overwrite g.rename rast=new,old --overwrite done In shell command seq 5 creates a sequence 1, 2, 3, 4 , 5. Note that you shouldn't use r.mapcalc like this (read from and write ...


2

It's caused by a picture item with an invalid or corrupt picture path. Click on the item and check the image source.



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