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orange_juice
(Stranger )
09/16/12 03:26 PM
cartographic minimum unit - doubt new Report this article as Inappropriate to us !!!Login to Reply

Hello! Anybody can help me with a problem related to cartographic minimum unit?

How to change the cartographic minimum unit of a raster image in ArcGIS? for example to 5 hectares?


Thanks for your help!         





scrabblehack
(Newbie)
09/18/12 07:13 AM
Re: cartographic minimum unit - doubt [re: orange_juice]Report this article as Inappropriate to us !!!Login to Reply

What's your pixel size?


At 30m x 30m pixels (Landsat) this would be 56 pixels.  You could do 8x8's all the way across your image - what, if all 64 pixels were one class, keep it; if not then call it empty? 


If you're looking for all possible sets of 56 contiguous pixels, you've got quite a job.


 





orange_juice
(Stranger )
09/18/12 05:48 PM
Re: cartographic minimum unit - doubt new [re: scrabblehack]Report this article as Inappropriate to us !!!Login to Reply

 


Hello. 


Sorry, I forgot to tell. The pixel size is 10m x 10m, so I need 500 pixels to have 5 hectars.


My raster has three different categories. I already try the operations Region Group, Expand, Aggregate (on Generalization toolbox) but the results aren't very good to me because I can't see any difference...


Do you have another way to do this? Am I doing the wrong operations?


 


Thanks!


 






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