[GRASSLIST:1010] Re: GRASSLIST digest 1126

[Greg Sepesi]

> 
> Subject: [GRASSLIST:1007] Removing borders from USGS DLG SDTS.
> Date: Sat, 23 Aug 2003 23:17:48 +0000
> From: "Stonie R. Cooper" <stonie.cooper at planetarydata.com>
> To: GRASSLIST at baylor.edu
> 
> I have recently began to experiment with USGS DLG SDTS files, and was
> wondering if anyone knew how to get rid of the "frame" or "border" that
> presents itself as an artificial line in the resulting vector file.  I'm
> using the 1:100,00 DLG files, and the v.in.sdts to get the data into grass .
> . . with no problems there, but assumed enough info existed in the SDTS db to
> help remove the artificial border.
> 
> Thanks in advance for any tips.
> --
> Stonie R. Cooper
> Planetary Data, Incorporated
> 

I'm no expert, but I did briefly explore SDTS borders using GRASS
5.0.2's v.out.ascii.  The associated file in the cats directory shows a
bunch of category definitions such as

- - -
.
.
.
11:LE01#29
12:LE01#30
13:LE01#31
14:LE01#32
15:LE01#33
16:LE01#34
.
.
.
600:PC01#84
601:PC01#85
602:PC01#88
603:PC01#89
.
.
.
668:NO01#30
669:NO01#31
670:NO01#37
671:NO01#38
672:NO01#40
.
.
.
- - -

IIRC, plotting only the lines associated with the LE* categories got rid
of the borders.

Greg