[GRASSLIST:395] Re: SRTM coastline sharpening

[Markus Neteler]

Hamish wrote:

>>Following the GRASSNews_vol3 article on SRTM import, I was trying to 
>>sharpen coastlines using GSHHS shapefiles. However, the imported GSHHS
>>vectors are just lines and not areas. Therefore I do not know how to 
>>generate a raster MASK, because there is no area for v.to.rast to 
>>produce a filled raster coverage.
>>    
>>
>
>
>others have mentioned the new SRTM v2 so I'll leave that, but for the
>  
>

SRTM V2 is really recommended. They also ship their water masks along
with the
updated SRTM data.

>general vector how-to question:
>
>An area is made up of a boundary and a centroid, so two steps are
>needed:
>
># convert lines to boundaries
>v.type line,boundary
>
># add centroids 
>v.category op=add   # ?!!!
>
>This second part I know possible, but I forget the correct command.
>  
>
g.manual v.category
:-)

 4) Add categories/centroids to a vector map without categories

       v.category in=wkt out=wktnew option=add

Markus