[Xastir] Proposed change to handling of gps-downloaded shapefiles.

[Gerry Creager]

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
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