Latest Contributions by SteveLynch

John WRT random points within an area, see http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Create_Random_Points/00170000002r000000/ Steve ... View more

You can't. Do a "screen copy" and manipulate it in a Graphics package. Steve Lynch ESRI ... View more

We have a problem with some p-geodatabases in ArcGIS Geostatistical Analyst in version 10. Please convert your data to f-geodatabase (or shapefile). We are hoping to have a fix available post version 10 Service Pack 2. Sorry for the inconvenience Steve Lynch ESRI ... View more

GrizJohnson What format are you data that cause the crash? I.e p-geodatabase or f-geodatabase or shapefile? Thanks Steve ... View more

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 ... View more

- 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 ... View more

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 ... View more

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 ... View more

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