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Hi all, I am having trouble running a regression equation in Raster Calculator. I have ArcMap 10.1 SP1. Using the equation below, there is an output, but nothing is visible. Does it have something to do with the messiness of my mixture of floating point and integer files? Equation for Raster Calculator: 0.158544748 + (-0.422151664 * "lat") + (0.184392010 * "long") + (0.001245377 * "elev") + (-0.000000229 * "elevsq") + (1.121263096 * "parmat_al") + (1.003450855 * "parmat_gr") + (0.891204031 * "parmat_grhw") + (2.110142060 * "parmat_mix") + ( 0.000000000 * "parmat_pooled") + (-0.544200414 * "sdi") Output becomes: floating point; 32-bit; 938.631325x938.631325 H: 3.40282e+038 L: -3.40282e+038 Further information on each of my raster datasets: lat = floating point; 32-bit; 30x30 H: 582090 | L: 45600 long = floating point; 32-bit; 30x30 H: 1.56678e+006 | L: 30840 elev = unsigned integer; 16-bit; 30x30 H: 3896 | L: 220 elevsq = signed integer; 32-bit; 30x30 H: 15178816 | L: 48400 parmat_al = unsigned integer; 8-bit; 30x30 (applies for all metrics preceded by "parmat_") sdi = floating point; 32-bit; 938.631325x938.631325 H: 0.281522 | L: 0.00787991 I also tried adding one by one. In this order, once I try to add a second "parmat" dataset, the output goes blank. Separately, I tried adding ALL of the "parmat" datasets together, output is blank. The "parmat" datasets were previously one vector (polygon) dataset. I exported each type out to create their own raster datasets. Should I do this differently? Any suggestions or thoughts would be greatly, greatly appreciated. Even if you need to point me to some manual that will tell me how to do it. This type of analysis via ArcGIS is new to me, so I don't fully understand the "rules"... Thank you!
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05-13-2014
10:19 AM
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I am prepping the spatial datasets to run a regression model. The statistics have already been calculated outside of ArcGIS and I have the coefficients for each of my variables. I will be running the model via Raster Calculator/map algebra and plugging in the regression equation. e.g. output = 1.398 + (-0.432 * ELEV) + (0.231 * LAT) + (0.381 * SOIL_A) + (-0.1112 * SOIL_B) What I am having trouble with is the vector (polygon) dataset for soil type. I have the coefficient values for each of the soil types. Do I create another field in the polygon dataset for the coefficients, populate each of the soil types with their respective coefficients, then extract out by soil type to convert to separate raster layers? The resulting raster layer cells would all have the same [coefficient] values (per soil type). With those separate soil raster layers, are they added to the model as is? so instead of the above equation, would it actually be: output = 1.398 + (-0.432 * ELEV) + (0.231 * LAT) + SOIL_A + SOIL_B for my particular datasets? (I know it's probably not the correct syntax for raster calculator, but my question is about the general process). Or is this completely wrong and I need to be doing something else? Thanks, this seems like it should be very easy but I can't find any reference to this (or I'm not searching the appropriate terms/concepts)
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05-08-2014
12:53 PM
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