Raster to Vector

[Luis F. Franco]

Hi there.

I wonder what's "MIPS", because I too want to convert elevations files
to contour and needed to know how to do that. Isn't there a module that
does it?

Thanks

Luís Franco
------------------------------------------
Instituto das Comunicações de Portugal
Av. Jose Malhoa, Lt. 12
1070 Lisboa 
Portugal

Tel: +351 1 7211000
Fax: +351 1 7211006 


-----Original Message-----
From: Terry Duell [mailto:duell at atea.mat.army.defence.gov.au]
Sent: Segunda-feira, 12 de Outubro de 1998 6:33
To: grass at cecer.army.mil
Subject: Re: Raster to Vector


Akihiko Machida wrote:
> 
> Dear Sir/Madam,
> 
> We want to create contour map of 1m from 250m mesh raster map.
> Does anyone have a creative solution?
> 
> Our objective is to simulate the area of inundation from 1m rise of
> sea level.$B!!(J We have a limitation data and somehow we must infer
the(J
> elevation of 1m range.
> $B!!(

I think that you may have some trouble getting a result that makes nay
sense
if your elevation data is at 250m spacing. That grid was probably built
from
quite sparse data which may have had a vertical accuracy of 50m or more.
I would be trying to get the original spot height data that was used to
build
the 250m raster, and exporting that to another application such as MIPS,
and
then building a TIN and extracting a fine reolution grid from that. This
way
at least you will be able to interpolate better between known points in
the
original data, and the finer the grid the smaller the error in flooded
area.
The large 250 grid data can lead to large errors in coverage for each m
rise
in water level.
Hope this helps.

-- 
Terry Duell