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Arcgis 10.2

I currently have a raster file that I want to turn into a set of polygons. This will help me to create specific buffers around certain points. The extent of my values are 0, and 1. When I change from raster into polygon, I end up with polygons for both 0 AND 1. I only want polygons for pixels with value 1. If I have polygons for values of 0, I end up capturing a bunch of empty space that it totally not necessary to the project.

Here is an image of what I am working on (white = 1, black = 0):

enter image description here

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3  
Just reclassify the grid so that 0 is NoData –  Dan Patterson Apr 16 at 2:03
2  
Or just extract the 1 using geoprocessing tool 'extract by attributes' help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//…, unless of course you're saying you don't want islands of 0 inside your 1 in which case I would use the geoprocessing tool 'feature to polygon' help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//… to fill the holes before using polygon to raster. –  Michael Miles-Stimson Apr 16 at 2:51
    
I used "Extract by Attributes" the Where formula was "Value = 1." This did the trick. –  ian Apr 16 at 17:56

1 Answer 1

you can use raster calculator to set your 0 values to NoData. Con(condition, value if true, value if false) will set the false value to Nodata if it is left blank.

in your case, you could use

Con(raster== 1, 1)

a more generic code would be

Con(raster!=0, raster)

when you convert to polygon, NoData pixels will be ignored.

Note that you can make something equivalent to the vector buffer using "expand" on your raster.

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1  
SetNull is the ideal tool to use. –  whuber Apr 16 at 14:39

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