[GRASSLIST:4429] Re: (no subject)

[Bernhard Reiter]

Just some answers.

On Wed, Sep 04, 2002 at 08:24:56AM +0000, Miha STAUT wrote:

> 2.
> How can you change projection without an extensive knowledge in 
> cartography? E.g. how can I change the mercator projection found in GTOPO30 
> to let's say lambert conical or delisle conical. I know Grass supports a 
> lot of projections but r.proj seems to be to complicated.

Changing a projection in raster data is always a complicated task.
You have to be aware of the mechanisms to judge your data quality
for this operations AFAIK.

> 3.
> I have problems with exporting vector files into the Idrisi file format. 
> The command performed was:
> v.out.idrisi type=line in=grass_vector out=idrisi_prefix
> The program complained about a "segmentation fault". I do not know what 
> could that mean. I also know there are other ways of importing into Idrisi 
> but I want to know how to manage it this way.

This looks like a bug. You need to give more details to the developers
so that they might be able to track that bug.  Check:
http://grass.itc.it/bugtracking/bugreport.html

> 5.
> Why Grass in some operations works in two different modes (you can choose 
> between the fast but memory intensive and the slow mode), e.g. 
> r.surf.contour? Other programs no matter what, work always with the same 
> speed. Slow but memory non intensive mode is really very slow even with 
> small rasters. If you try to choose the fast mode and you run out of memory 
> it automatically switches in the slow mode. Is there anything you can do, 
> not to run in neither the trouble without having to add more memory?

Adding more swapspace will help.
The low memory modes were more useful in history when cheap memory
and disks were not available.

	Bernhard
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