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Thread: extracting values from raster

  1. #1

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    Default extracting values from raster

    Hi all,

    Its been some years ago since I worked with rasterdata for real, so I have to brush up my knowledge on this subject. Hope you guys is able to help.

    I have a raster file (img) containing gridcells with values represent floodvalues (0,1 representing 10 cm water on the surface). I want to extract the cells with more than 10 cm water on the surface. I´ve tried with the extract by attributes, but somehow there isn´t a attribute to select?! If I use the info selection on one cell I get the stretched value and the pixel value (which is equel to the amount of water) so there must be a value somewhere that I should be able to extract on.

    What am I missing? Can somebody please guide me in the right direction?

    Thanks in advance

    Christian

  2. #2
    Mark Boucher
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    Default Re: extracting values from raster

    Have you tried the Con() function in the raster calculator?
    http://help.arcgis.com/en/arcgisdesk...00000zn000000/

  3. #3
    Dan Patterson

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    Default Re: extracting values from raster

    are you using the raster calculator (map algebra in ArcToolbox)? if it is an integer grid you want to query for values > 1
    Geomatics, Carleton University, Ottawa, Canada
    http://obidangis.blogspot.ca/

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