[gradsusr] Creating "Lines" Shapefiles

[Stephen McMillan]

Thanks Jennifer, your answer is helpful, so I can focus elsewhere as you
suggested.  The new shapefile capabilities will be very useful as they are,
and I much appreciate all that you and the rest of the development team have
done to make it possible.  Keep up the great work!

Stephen McMillan

On Tue, Oct 26, 2010 at 1:05 PM, Jennifer Adams <jma at cola.iges.org> wrote:

> Hi, Stephen --
> Brian and I are glad to hear you are successfully using the new shapefile
> interface. Unfortunately, what you are asking for is not in our development
> plans. The graphical elements created with the 'draw' command are not based
> on gridded or station data in a lon/lat spatial domain, but on the page
> coordinates in an X,Y domain. There is no existing mechanism to convert
> elements from the graphics metafile buffer back into a lat/lon environment
> and then output a shapefile.
>
> There may be some other software tools out there to create shapefiles based
> on user-defined coordinates, but it might not be such a difficult
> stand-alone program to write yourself. Start by looking at the examples in
> the shapefile library's source code.
>
> --Jennifer
>
>
>
>
>
> On Oct 25, 2010, at 11:04 AM, Stephen McMillan wrote:
>
> I think it's a great addition to have both the draw- and create-shapefiles
> capabilities in GrADS now, and have successfully done both from the latest
> release.
>
> As I understand the online documentation, shapefiles can be created using
> only the "display" command, and that "the shape types currently supported
> are points and lines...."  with lines being contour lines.  Are there any
> plans to support shapefile creation using the "draw" command, such as for
> creating straight line segments or polygons, as it does for drawing
> shapefiles?
>
> Perhaps the developers or another user knows of a way to write shapefiles
> derived from drawn (not displayed) map features.  The only way I can think
> of is to somehow incorporate the desired line/polygon features within a
> gridded file, perhaps similar to the way "lat" and "lon" are done, except
> crossing lat/lon lines.
>
> I am using the OpenGrADS version 2.0.a9.oga.1 on a Windows XP.
>
> Thanks
> Stephen McMillan
>
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>
> --
> Jennifer M. Adams
> IGES/COLA
> 4041 Powder Mill Road, Suite 302
> Calverton, MD 20705
> jma at cola.iges.org
>
>
>
>
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