[GRASS-user] Coastline extraction

[Luigi Ponti]

Dear Matteo,

as you suggested off list, the solution is in this old thread:
http://n2.nabble.com/GRASSLIST-375-SRTM-coastline-sharpening-td1841248.html

i.e. you should probably use a newer version of the SRTM dataset, which 
is now at version 4. The website claims it to be the "highest quality 
SRTM dataset available":
http://srtm.csi.cgiar.org/

Kind regards,

Luigi

> Date: Fri, 29 Jan 2010 16:13:58 +0100
> From: "Matteo Toro" <ciccpaol at libero.it>
> Subject: [GRASS-user] Coastline extraction
> To: "grass-user" <grass-user at lists.osgeo.org>
> Message-ID: <KX0KZA$5887F5E83EAD2C08A24FED403D3C6861 at libero.it>
> Content-Type: text/plain; charset=iso-8859-1
>
> Hi everybody,
>
> I'm using an SRTM .tif file and a vector file (from vmap0 dataset) to clearly define a region.
>
> On the srtm i filled the voids with r.fillnulls, but on the coast the data are no clear and coastlines are not real at all. The sea depth as well is completely "crazy", and I really don't need it!
>
> Since i have got the vector file of the coastline, is there any way to tell grass to execute the command r.fillnulls just until the coastline?
>
> I tried something converting at first the vector file of the coastline into a raster, and then i used the mask command, but I am not able to get the results that i need.
>
> Many thanks!
>