Latest Contributions by SteveLynch

PolygonToRaster takes a priority field. ... View more

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 ... View more

see exercise 6 of Geostatistical Analyst tutorial at http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=Tutorials ... View more

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 ... View more

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 ... View more

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 ... View more

Patrao Could you attach the smaller subset of the data and the field that you are interpolating on. Thanks Steve Lynch ... View more

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 ... View more

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 ... View more

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 ... View more

Not at all. From the ArcToolbox Conversion Tools -> To Raster -> Feature to Raster Steve ... View more

What about using the Feature to Raster geoprocessing tool ? see http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/An_overview_of_the_To_Raster_toolset/00120000002r000000/ Steve Lynch ESRI ... View more

The geostatistical layer is an in memory layer. To persist it, use the SaveToLayerFile tool, viz., Usage: SaveToLayerFile <in_layer> <out_layer> -Steve ... View more

- can you export it to vector (i.e contours)? - export to grid, are you accepting the defaults? - can you attach a zipped file with the GA layer and the data used to create it? Thanks Steve ESRI ... View more

Wes Totally different algorithms are used. Steve Lynch ESRI ... View more