[GRASS-user] How to generate a random DEM Model of given size & resolution

[Moritz Lennert]

Hi,

On 28/09/20 13:52, BHARATH RAM wrote:
> Hello,
> 
> I want to generate a set of random DEMs ( epsg code known to me). I am 
> aware that I need to use r.surf.fractal and specify fractal dimension.
> 
> But how do I specify other parameters of the raster map (like length & 
> breadth, resolution?)

You just set the computational region using g.region. Any map you create 
will respect that setting.

> 
> Also, can you guide me towards how generate a set of many such maps 
> using scripting?

The answer here really depends on your level of existing knowledge. Most 
people nowadays prefer using Python for scripting, although you can also 
create simple shell scripts. I would suggest that you read through 
https://grasswiki.osgeo.org/wiki/GRASS_GIS_APIs first and come back to 
us if you have more specific questions.

> 
> Also, are there any tips for me to follow so as to make this (DEM raster 
> map) dataset generation as fast as possible?

Speed will depend on the size of the maps you create.

Moritz