[Xastir] Proposed change to handling of gps-downloaded shapefiles.
Gerry Creager
gerry.creager at tamu.edu
Wed Dec 13 15:51:58 EST 2006
Curt Mills wrote:
> On Wed, 13 Dec 2006, Tom Russo wrote:
>
>> Now a question: is anyone aware of a good tool for tweaking shapefiles, as in
>> removing garbage points? I downloaded a GPS track, and there was a single
>> extra point at the beginning that was garbage --- several degrees jump from
>> the first and second point, and after that it was fine. Xastir is drawing
>> a huge line from the starting point to the second point, and has a rendering
>> problem at zoom levels below 8 when it tries to draw that line (fills the screen
>> with horizontal bars). Unfortunately, I cannot find any tool that will let
>> me delete that first point from the shapefile. I've tried qgis, but even
>> though it'll let me edit the layer and will flash the point when I click
>> the "delete vertex" tool on it, it doesn't actually do the deletion. Grrr.
>> Any helpful hints would be welcome.
>
> Can't help you on the editor, except perhaps GRASS.
Quantum GIS (QGIS)?
> As far as the horizontal lines all over the screen, that's a known
> X11 bug. It happens if we have X/Y screen coordinates that are over
> 15 or 16 bits I think. There are places all over Xastir where we
> try to prevent calling the X11 functions with numbers higher than
> 15000 or so. Perhaps the GPS trail display code doesn't have that.
>
--
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University
Cell: 979.229.5301 Office: 979.458.4020 FAX 979.862.3983
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