topic Re: automatic drawed polygons in Data Management Questions

automatic drawed polygons

AndreasDaim — Fri, 10 Aug 2012 16:48:04 GMT

hey community!

is it possible to automate polygon drawing on this georeferenced picture?
[ATTACH=CONFIG]16835[/ATTACH]

I want GIS to detect the dark black areas and surround them with a polygon.

best regards
hagen

Re: automatic drawed polygons

PavanYadav — Sun, 12 Aug 2012 03:39:18 GMT

Hi Hagen,
You may want to try Image Classification.

Regards,
Pavan

Re: automatic drawed polygons

AndreasDaim — Tue, 14 Aug 2012 11:08:11 GMT

That seems to be the right tool, thanks Pavan.
But i still didn't figure out to get good results.
I am greatful for hints to maximize results of this image with image classification.

best regards!
hagen

Re: automatic drawed polygons

PetronilaMandeno — Tue, 14 Aug 2012 22:26:39 GMT

Well, one thing you can do is use the Image Analysis tool to sharpen the image and change the contrast so that the Image Classification tool will pick up the features that you want. Then you can, of course, convert the resulting raster into polygons. Once you have the polygons, you can fine tune them with the standard feature editing tools.

Does that help?

Re: automatic drawed polygons

AndreasDaim — Mon, 20 Aug 2012 21:02:58 GMT

i didnt figure out, how to sharpen the image or did i use the wrong tool?

can u pls describe the sharpen process step by step?

Re: automatic drawed polygons

AndreasDaim — Sun, 26 Aug 2012 22:16:08 GMT

i didnt figure out, how to sharpen the image or did i use the wrong tool?

can u pls describe the sharpen process step by step?

i managed work with the image analysis - thanks!
didnt get the results at the moment i want to but still trying on. perhaps it's neccesary to edit this difficult images in photoshop before arcgis use.
i'll write again after checking out the best solution.

best regards
andreas