[GRASSLIST:3245] Re: Rastering

[Karine ZUERCHER]

Sjors,

Have you checked the region settings (g.region -p) just before doing the 
v.to.rast?
You should have the nsres & ewres equal to 1 &  rows & cols 5000.

Hope that may help
In Kindness

Karine
 
On Wednesday 27 February 2002 15:43, J.c.m. van der Kwast wrote:
> Hi everybody,
>
> For some time now I'm wrestling with the rasterization of thin
> linear/area objects. The case is as follows, xy projection, area 5000 x
> 5000 m (or units), grid 1 x1. I've got thin areas of 3 m wide and trying
> to raster them. I would expect to see them as thin linear objects in a
> raster map of the whole area. But the areas are broken. When zooming in
> extremely then the areas seem to form lines or areas again, but are they
> continuous? Maybe it has something to do with the scale?
> When given a z value and patched with a dem, the dem is correctly
> displayed but the thin areas are broken into pieces (as they are in the
> whole raster map). Does it mean that I should divide the map up into
> small portions with a desirable resolution, raster them and patch them
> back together in the desired resolution? Personnally I don't think it
> will help as the areas formed do not seem to be continuous.
> Some time ago I wrote a mail with the title landscape. The problem is
> much the same, only with rastering linear features. As my background is
> not GIS (but agriculture) it could be I'm trying to do something which
> isn't possible at all. But looking at it logically, a feature of 1 cell
> in a grid of 1 x1 should at least take the value I've given it. If it
> doesn't show up at the screen I can live with it. Problem is, it does
> sometimes will and sometimes won't show up.
> I've been playing around with a lot of functions and manuals but still
> this puzzles me greatly. If anyone has any answers, I'd be most grateful,
>
> Warm regards,
>
> Sjors

-- 
Karine ZUERCHER

kzuerch at yahoo.com