[GDAL-DEV] Query..

[Frank Warmerdam]

abhay menon wrote:
> Hello Lists,
> 
> I have few queries ...
> 
> 1) can I use two different dataset  (MapInfo File and/or ESRI Shapefile) 
> and preform a spatial operation and create a thrid output using the 
> gdal/ogr libraries.

Abhay,

Well, you can certainly do this using OGR as a library.  Depending
on the spatial operation you will likely need to have GEOS support.

> 2) If so can I prefrom a raster overlay analysis that could be conducted 
> with a raster and a vector dataset, which is used to updates the vector 
> dataset attributes with the certian values.

There are limited options currently for relating raster and vector data.
If you had vector polygons and you wanted to collect statistics from a
raster within the polygon you could use the new rasterization support to
generate a raster mask, and then use that to identify pixels in particular
polygons for statistics collection.

Generally speaking though, GDAL/OGR isn't going to do much of the work
for you.  Mostly just the data access.

> PS. Is there any sample programmes to developing code using gdal/ogr 
> libraries which I could lay my hands on.. other than source code of gdal.

Generally speaking no.  There are a variety of sample scripts which
illustrate some of the concepts, and some commandline c/c++ programs
(the utilities).

Best regards,
-- 
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | President OSGF, http://osgeo.org