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Calculating area from raster image   Justin Vasseau Mar 25, 2010
Re: Calculating area from raster image   William Huber Mar 25, 2010
Re: Calculating area from raster image   Justin Vasseau Mar 25, 2010
Re: Calculating area from raster image   William Huber Mar 26, 2010
Re: Calculating area from raster image   Justin Vasseau Mar 31, 2010
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Subject Calculating area from raster image 
Author Justin Vasseau 
Date Mar 25, 2010 
Message Hello. I have a project in which area calculations are to be done with a raster image for land cover types (such as how much upland is located in a boundary such as an easement area.) Would it be easier to do them by hand or is there away in the Arc Map software. My question is there a way to use the image itself to do the calculations. Any response would be helpful. 
   
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Subject Re: Calculating area from raster image 
Author William Huber 
Date Mar 25, 2010 
Message The basic technique, Justin, is to classify the image by land type, thus creating an attribute table for each type. This table always contains a [count] field enumerating the number of cells of each type. Multiplying the count by the square of the cellsize therefore estimates the total area. 
  --Bill Huber
Quantitative Decisions (http://www.quantdec.com )
More GIS Q&A at http://gis.stackexchange.com/q/3083/664 
   
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Subject Re: Calculating area from raster image 
Author Justin Vasseau 
Date Mar 25, 2010 
Message Hello and thank you for your time and input on this matter. I have a shape file boundary easement file that sets up the easement area (I did not include in this previous post). Is there a way to do the calculation again with respect to using this boundary easement (calculate the area in the easement area?) If you need to see samples I can send you some samples.
Justin.
 
   
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Subject Re: Calculating area from raster image 
Author William Huber 
Date Mar 26, 2010 
Message There are several ways to restrict the calculation to a specified region. Consider performing a zonal summary. Zonal statistics are available in the SA menu (as well as in the other usual places: Raster Calculator, command line, SOMA tool, MOMA tool, and scripting). 
  --Bill Huber
Quantitative Decisions (http://www.quantdec.com )
More GIS Q&A at http://gis.stackexchange.com/q/3083/664 
   
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Subject Re: Calculating area from raster image 
Author Justin Vasseau 
Date Mar 31, 2010 
Message Hello. Iím putting in the images that have been created in Arc Map and looking for some feedback on the project. If one read all threads have been posted on this project in which various area calculations are required to be done. What is trying to be done is take a shape file combine it with a raster image from Center for Geographic Information Website(State of Michigan) and do area calculations that are restricted within the easement shape file boundary. The inserted image will give twofold visualization plus the idea of what is trying to be done. Any comments or suggestions would be very helpful. Also I would to publicly thank the one gentleman that has written on some previous thread to guide thinking in this process. If this is not clear drop me a line. 
  mulligan_creek_preserve.jpg (opens in new window)