[GRASS-user] How to import KML polygons in GRASS?

[Hamish]

Nikos Alexandris wrote:
> Maybe I am just loosin' my time struggling to import KML polygons in
> GRASS but here is my attempt and my problems.

You might try using v.in.gpsbabel, 
  http://www.gpsbabel.org/htmldoc-1.3.0/fmt_kml.html
  http://www.gpsbabel.org/htmldoc-1.3.0/fmt_google.html


> The problem is that the coordinates are given in form of x,y,z but
> continuously... that is one "x,y,z" field after another separated by
> "space"  and   not in separate lines!
> 
> It looks like this:
> 
> x1,y1,z1 x2,y2,z2 x3,y3,z3 [...] xi,yi,zi
> 
> and NOT like this:
> 
> x1,y1,z1
> x2,y2,z
> x3,y3,z3
> [...]
> xi,yi,zi

perhaps:

cat infile | tr ' ' '\n' > outfile
edit outfile, add "L "
v.in.ascii

or search & replace in nedit or some nice editor.
?

see v.in.garmin, v.in.gpsbabel for awk magic to add "L number" to lines
automatically.


> 7. If this is going to work I was thinking to "grep" somehow the
> metadata out of the "saved as txt file" and force it with a script in
> the X.grass-ready ascii

see v.in.garmin, v.in.gpsbabel for ideas on creating a DB table and
linking it to lines by cat number.


> * ogr officially supports "KML" reading and writing. I can't read
> with ogrinfo any KML file. I have read about "expat" support...
> but isn't this activated by default in ogr coming with FWTools?

fyi expat:
$ apt-cache show libexpat1
....
Description: XML parsing C library - runtime library
 This package contains the runtime, shared library of expat, the C
 library for parsing XML.


If you find a nice solution could you add some instructions on the
wiki?
Including all the links people have mentioned.



Hamish



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