Latest Contributions by SteveLynch

Jay Do you have Geostatistical Analyst? If so you can use cross validation to find the best model. If you don't you could do some validation, i.e. hide some data, create a model, then predict to the 'hidden' locations. This will help you find a good/suitable model. Regards Steve ... View more

Jeff Please email me your input point feature class. Also what field are you interpolating on and are you accepting the default cell size? Thanks Steve slynch@esri.com ... View more

Create a raster covering your area (use a cell size that will produce about 100 columns or rows), use CreateRandomRaster then convert this raster to points (RasterToPoint). This will be you feature class where the predictions will be produced. Use this as your Input Point Observation Locations file. The output feature class will have all the stats you require. For more detail, use a finer cell size, when creating the Random raster. ... View more

Bruce What version (and Service Pack) of ArcGIS are you using? What interpolation method are you using? What values are you trying to interpolate? Have you tried something like; 1) create a GA layer using the Wizard 2) use CreateGeostatisticalLayer tool (using layer created above and 1st of 1000's of shapefiles) 3) GALayerToGrid to create output raster using layer created in step 2 4) repeat steps 2-3 Steve ... View more

Have you searched this Forum? and in particular look at http://blogs.esri.com/esri/arcgis/2010/06/18/automating-geostatistical-interpolation-using-template-layers/ ... View more

also remember that a shapefile has a 2.1GB file size limit which comes into play around 40 million points or when the .dbf has many features See https://en.wikipedia.org/wiki/Shapefile ... View more

Have a look at TopoToRaster in the Spatial Analyst toolbox ... View more

Please don't convert the contours to points, that would not be a good idea. Change the Dice size to, say less than 250000 and try, as the max number of vertices allowed in the contour lines are dependent on the output raster size and the number of vertices in a contour line. If that does not work then try a smaller number. and BTW, bumping up the number of point in ArcMap has no effect Steve ... View more

Yes, convert them to Polylines. IDW uses a "line of sight" approach. ... View more

Reply #1 - say fc (feature class) is used as input to GALayerToPoints and output is fc2 - then AddField to fc - CalculateField from fc2 to fc - and repeat Reply #2 - the GA layer, in the TOC of ArcMap, can be saved to a .lyr file using SaveToLayerFile, or - if they (GALayers) are stored as .xml files, then use CreateGeostatisticalLayer tool Steve ... View more

Use the Dice tool (http://resources.arcgis.com/en/help/main/10.1/index.html#//001700000037000000) ... View more

I�??m afraid to say that I am unable to reproduce this. The only thing that we can think could happen is the following; many Geostat methods are multi-threaded (http://resources.arcgis.com/en/help/main/10.1/index.html#/Parallel_processing_with_multiple_CPUs/0031000000q5000000/) and what could be happening is that one thread is still calculating and a parameter is changed which means that that thread should be killed and a new one fired off. One way, and I know that K Bessel takes a long time to process, is to wait for the model to finish updating before a parameter is changed. ... View more

or... - set the processing extent around the pixels of interest - and also set SnapRaster=your input raster - RasterToPoint - edit the attributes (of the points) - PointToRaster and use the same cell size and extent as your original raster - use IsNull and Con to "insert" the changed raster into your original raster Note that RasterToPoint works with integer, floating point or string data. -Steve ... View more

If you are only interested in the area then you can run the IsNull tool, open the attribute table which will have 0 and a count and 1 and a count. The count for 0 is the number of cells that are not nodata. Multiply this by the squared cell size. Steve ... View more