[Geotools-gt2-users] Re: Response to Raster to Vector question

[Satyanarayana Murty Pindiproli]

  hi,
thanks for ur help.
Will definitely get back to you incase i do find the Code for raster to vector.I think i might have to do that myself if no such support Exists for the Currently available raster formats.I forgot to put a Sub line on this one as i was in hurry..but my earlier mails do have them.
Will remem it next time.

Thanks & Regards ,
Satya



On Fri, 30 Sep 2005 Jody Garnett wrote :
>Satyanarayana Murty Pindiproli wrote:
>>  Hi Guys ,
>>
>>My name  is Satya.
>>I have used geotools in developing a Mapping and Routing Application .
>>With JTS 1.6 ofcourse.
>>I now need to provide the Same features for Raster Images.
>>Can u please guide me in my queries ?
>>
>>1. Can I Treat raster images similarly as other DataSources (Shape Files et all)
>No - raster formats are available through a different API, called GridCoverageExchange in geotools 2.1.1
>
>>2. Can I extract features from the Raster Images ?
>You could, there are publish techniques, but right now geotools does not have one.  Note most of them involve doing a threshold on the raster and then doing edge detection then starting at the right and shooting as ray until you hit an edge, and then walking around the edge until you are back where you started.
>
>There are other scanline based techniques - consult a refernce book like Floey & van Dam (book is Computer Graphics Prinicples and Practice).
>
>>3. Can Anybody guide me - with code /snippet for Raster images that they have already worked on .
>
>There is a tutorial - <http://docs.codehaus.org/display/GEOTOOLS/Grid+Coverage>
>
>>Please reply to this.My earlier mail had not been replied by anybody and am now stuck up.
>
>I think we had difficulty understanding your question - and having a subject line on your message really helps.
>
>If you can hunt down (or create) some raster to vector conversion code please let us know.  I had some when I worked at a commercial company, but have not bother to write it again.
>
>Jody
>