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Please can you email me the p-geodatabase (slynch@esri.com) and for the time being copy the featureclass to f -geodatabase or shapefile. Thanks Steve
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02-09-2011
04:23 AM
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- Can you reproduce the problem, i.e does it happen each time you try? - Have you applied Service Pack 1? - Are you using a joined field? - Can you send the data? Thanks Steve Lynch ESRI
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02-08-2011
01:49 PM
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Please see http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00300000000q000000.htm The raster can be created using Spatial Analyst, 3D Analyst, Geostatistical Analyst or any other program that'll create a raster with values between zero and one. Steve Lynch ESRI
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02-07-2011
06:35 AM
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Natural Neighbor interpolation in ArcGIS does not support a Mask. See help, viz. Environments supported Cell Size, Current Workspace, Output Coordinate System, Extent, Scratch Workspace, Snap Raster it also does not allow you to extrapolate outside the convex hull. Hope this helps. Steve Lynch
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02-02-2011
10:40 AM
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Brenna Have a look at the Cross validation tool that is new at 10 http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Cross_Validation/00300000000z000000 in Python you'll do something like import arcpy cvResults = arcpy.CrossValidation_ga("CoKriging") print cvResults.rootMeanSquare print cvResults.the other ones you need and so on (you will write these to a file) Steve
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01-28-2011
09:37 AM
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see exercise 6 of Geostatistical Analyst tutorial at http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=Tutorials
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01-24-2011
02:28 PM
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Bill My point was that SA has a problem with coincident points and not GA. We will look into that. In order to do kringing in SA one needs to do the variography manually, which most people do not do, they accept the defaults. In GA the variography is interactive via the Wizard. However, we have found that most people accept the default values. We have therefore, in version 10, introduced an "optimize" button which produces good defaults through cross-validation. Bottom line is, analyse the data before using kriging and do not use kriging because you've heard that it is a good interpolator :-). Steve
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01-20-2011
06:55 AM
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GA does not fail with this data, it correctly uses coincidint data. Spatial Analyst's default kriging model does not produce output in certain areas. If the kriging assumptions are met then output will be produced everywhere. The data, in it's current form, is not suitable for kriging. Please look at the histogram of the input data. Steve Lynch
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01-19-2011
07:58 AM
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The dataset that you provided has coincident data (151 points). The default model that Spatial Analyst fits cannot make predictions in the areas where you see the Nodata values. Some solutions are; - get rid of the coincident points (use Dissolve and then predictions are made everywhere in your area) - model the semivariogram and better understand your input data. If you have Geostatistical Analyst then this will make it much easier. Steve
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01-18-2011
09:01 AM
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Patrao Could you attach the smaller subset of the data and the field that you are interpolating on. Thanks Steve Lynch
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01-18-2011
06:58 AM
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It does not honor MASK by design. Natural Neighbor also does not extrapolate data outside the convex hull. According to the help the only environments that are honored are Cell Size, Current Workspace, Output Coordinate System, Extent, Scratch Workspace, Snap Raster Steve Lynch ESRI
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01-14-2011
04:23 AM
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Jill If the one layer is raster and the other feature you could convert the feature layer to raster. Make sure that the extent and cell size of the output is the same as that of the soils raster. Now you have 2 rasters that have the same extent and cell size. There are many tools in the Spatial Analyst toolbox that can assist in finding differences. Start off using the Minus tool or the Identify tool. Steve
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10-29-2010
04:15 AM
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Brooke The Smooth option in the searching neighborhood was developed to fix this problem, see explanation in Gribov, A., and Krivoruchko, K. 2004. Geostatistical Mapping with Continuous Moving Neighborhood. Mathematical Geology, Volume 36, Number 2, February 2004. or on-line http://training.esri.com/campus/library/bibliography/recorddetail.cfm?id=30571 Steve Lynch ESRI
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10-27-2010
08:12 AM
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Not at all. From the ArcToolbox Conversion Tools -> To Raster -> Feature to Raster Steve
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10-13-2010
10:15 AM
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