[gdal-dev] Topological pointer

[Nikhil Sai Parupalli]

Frank,

As said I have my system variable as

"RETURN_PRIMITIVES=ON,RETURN_LINKAGES=ON,LNAM_REFS=ON,
UPDATES=APPLY,SPLIT_MULTIPOINT=ON,ADD_SOUNDG_DEPTH=ON"

but still I couldn't  see TOPI field retrieved in my dataset..
Will you elaborate and let me know.

I have one more question:
How do we find  area outer boundaries are encoded clockwise based on Orientation or USAG.
here when I retrieve S57 dataset I get multiple ORNT values for a single object.




Thanks and Regards
Nikhil Sai Parupalli



Note: Do not print this email until and unless it is really required. Save paper , stay Green
________________________________
From: fwarmerdam at gmail.com [fwarmerdam at gmail.com] on behalf of Frank Warmerdam [warmerdam at pobox.com]
Sent: Saturday, October 06, 2012 2:32 AM
To: Nikhil Sai Parupalli
Cc: gdal-dev at lists.osgeo.org
Subject: Re: [gdal-dev] Topological pointer

Nikhil,

>From the code it appears the TOPI field will be represented on the vector primitives when you enable treating vector primitives as features.  To enable this you need to set the RETURN_PRIMITIVES=ON configuration option.  See the S57 driver page for some background.

http://www.gdal.org/ogr/drv_s57.html

It looks like the attributes will be named TOPI_0 and TOPI_1 and will be integer fields containing the start and end point id I gather.  The S57 topology support is a pretty fuzzy in my head.  There is also other topological information (I think) accessable on the vector primitive features.  Some likely as hard to use list attributes.

Best regards,
Frank

On Fri, Oct 5, 2012 at 11:06 AM, Nikhil Sai Parupalli <nikhil.parupalli at iictechnologies.com<mailto:nikhil.parupalli at iictechnologies.com>> wrote:
Hi All,

We are working on project which renders S57 dataset , I used GDAL for rendering GIS data and DOTSPATIAL for displaying map.
Here I could read dataset , but can any one know how do we get Topological Indicator value



Thanks and Regards
Nikhil Sai Parupalli



Note: Do not print this email until and unless it is really required. Save paper , stay Green

_______________________________________________
gdal-dev mailing list
gdal-dev at lists.osgeo.org<mailto:gdal-dev at lists.osgeo.org>
http://lists.osgeo.org/mailman/listinfo/gdal-dev



--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com<mailto:warmerdam at pobox.com>
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Software Developer

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20121008/9c753831/attachment.html>