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Thank you Tom, I see now the benefits of your suggested method. I have extracted the "9"'s and convert to polygon but I cannot find which tool you are suggesting to use to compare two polygonss to find the changes... (I have an ArcInfo license). I would appreciate if you can tell me the name of the tool if possible? Many thanks Ber
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07-30-2013
06:23 AM
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Hi Tom, Many thanks for your reply. I think I may have done something similar - I used raster calculator to subtract each map from my base map to look at the difference between cell values. Do you think the method you suggest will produce different results to what I have done? I see that you have suggested to extract the cells with a value of 9, but i'm still not sure of the difference between the two methods. Many thanks, Ber
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07-29-2013
02:46 PM
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I want to look at the impact of varying weight values in a weighted overlay analysis (it???s part of a study on the impact of uncertainty in weights on the resulting maps when using weighted overlay analysis to find suitable sites for development). I have 13 different sets of weights which sum to 100 and 13 maps, each prepared with a different set of the 13 weights. The first map using the values 65 + 28 + 7 is my base map and all other maps are a variation of the base map values. For example one map uses the values 59 + 33 + 8, another uses 69 + 24 + 7, another uses 71 + 22 + 7 and so on. My resulting maps have cells with values between 1 and 9 with cells of value 9 being the most suitable locations for development. For each of my maps I want to compare the total number of cells with a value of 9 against that of my base map - so I want to compare the base map against each of the 12 other maps and look at whether and to what extent the amount and location of cells with value 9 changes. (I want to find out to what extent uncertainty in the input weights influences the output of the weighted overlay analysis). Any suggestions of a suitable method to carry out this analysis would be appreciated. I have been using raster calculator to subtract each of the variation maps from the base map but I want to focus just on difference in the most suitable cells (i.e. those with a value of 9) and the raster calculator doesn???t seem to be a very efficient way of doing this. Many thanks Ber
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07-26-2013
12:04 PM
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Update - following a response from the developer the AHP extension now works in ArcMap 9.2. When I tried to install the extension I was getting a message saying "No new objects added". To install the extension you have to install it in administrator mode. Right click the ArcGIS icon and select "Run as admin...". The extension should then be available in the "Developer tools" section. Go to menu Tools -> Customize. Go on the second tab. Scroll down the list on the left hand side until you see "Developer samples". Click on this item. On the right hand side you would see a text that says "AHP...". Click on that item and drag it to an ArcMap toolbar. Then close the window and the extension should be ready for use.
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07-26-2013
11:46 AM
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