[GRASSLIST:5741] Re: Creating DTM from shapefiles

[William K]

I've been using this method for a while, didn't come up with a script 
tho.  But while it works, I find it extremely (painfully) slow - 
exporting 10s of 1000s of point takes many HOURS for me.  ogr2ogr 
appends very fast, since that's exactly what it is doing - appending.  
The import goes much faster than the export.

I hope someone is working on v.patch so this can be done natively in 
GRASS.  Until that happens, I'll probably use the script, thanks.


On Feb 11, 2005, at 11:58 AM, Michael Barton wrote:

> We just tested v.append with a set of vector files derived from DGN CAD
> maps, imported into a UTM region with a WGS84 datum. It worked just 
> fine,
> combining both the vectors and attribute tables as I hoped. It 
> (ogr2ogr that
> is) automatically renamed the cat field to cat_ because, as Moritz 
> notes, it
> automatically creates a sequential cat value for the new vector file.
>
> I am attaching a new version that is somewhat improved and more secure
> (using g.tempfile) following advice from Hamish. I'll put this up on my
> website. If people like it and it continues to work well, I can do a 
> doc
> page and add it to the CVS scripts too.
>
> Michael
>

-----
William Kyngesburye <kyngchaos at charter.net>
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