--- On Sun, 21/6/09, Ross Scanlon <i...@4x4falcon.com> wrote:
> Now if I could just work out the exclude polygon filter for
> gpsbabel.
I got the following replies from Xoff... Didn't help me, but might help you...
----
If you want to change the excluded area there you just need to change the
following lines:
POLYGONS[0]=${DIR}/polygon1.arc
echo $'52.23 -0.3
52.34 -1.2
52.65 -0.3
' > "${POLYGONS[0]}"
Replace the coordinates between $' and ' > with the corners of the area you
want to exclude. So with the coordinates you mentioned it should look like this:
POLYGONS[0]=${DIR}/polygon1.arc
echo $'-33.0 150.0
-33.0 151.0
-34.0 151.0
-34.0 150.0
' > "${POLYGONS[0]}"
----
I just noticed that there was a bug in the script. I accidentally had copied
the code fore the second area two times into the script. I have updated this
now.
You may be able to find more information about the polygon files in the
gpsbabel documentation. Because what I do in the script is basically creating a
file for each polygon and then calling gpsbabel. Since I had a number of areas
to exclude I added the filenames to a bash array and called gpsbabel for each
filename in the list.
----
I had a look at the gpsbabel documentation
(http://www.gpsbabel.org/htmldoc-1.3.6/filter_polygon.html). Apparently, the
polygons must be closed. Repeating the first coordinate at the end of the list
should work.
I better fix this in the script on the wiki-page and add a comment. When I
uploaded the script I changed the polygons and forgot about this detail. I'm
sorry about that!
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