hello all friends i want convert raster image to vector in erdas and arc map too please reply to me and explain with pictures

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since nobody else has any ideas, i'll give it  a whirl...

what you can do:

Use a RasterCellCoercer to convert your rastercells to polygons and then a dissolver to dissolve them by value.

This might become slow and memoryintense though ..

you can get some ideas about raster2vector operations in fme here:
http://www.fmepedia.com/index.php/Raster_to_Vector_-_Centerline_Ext... 
and more general info about raster hacking here:
http://www.fmepedia.com/index.php/Category:Dmitris_Raster_Studio

also see this from Perdue..looks helpful... let us know if this helps..

Thank you justin
I have never used your program before. I personally used to create DEM by drawing lines along contour lines and giving elevation attribute value in Global Mapper. Then import to CAD Civil 3D.

Hi Min Oo, you can explain more you process to raster to vector ?  what softwares you use ?

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