Latest Contributions by SteveLynch

You can use the feature class called O3_Sep06_3pm in the ca_ozone file geodatabase. Rename the feature class or modify the code snippet. ... View more

Have a look at http://blogs.esri.com/esri/arcgis/2013/08/01/new-spatial-analyst-supplemental-tools-v1-2-august-2013/ ... View more

I'm not sure exactly what you are suggesting here. Are you suggesting doing the rasterization based on the object ID field rather than on the attribute field of interest? Yes, then join the featureclass table to the raster attribute table and persist the raster. Your raster will then have all the info from the featureclass. Another option would be to manipulate your two fields into one and then convert to raster. Steve ... View more

Max combined area will give different output because the values may be different. See How Polygon To Raster works in the help. Why don't you use the CELL_CENTER method and use the polygon FC's object-id field and then join the polygon's attribute table to the rasters table and persist it to a new raster. ... View more

IDW in Spatial Analyst will only use one point. However, it may be the first or last one encountered. Geostatistical Analyst on the other hand lets you control how coincident data should be handled. A big word of caution. There are many tools available in ArcGIS to identify and manipulate coincident data. Use them to determine which points to drop. For example, you have 5 coincident points. 1 has a "good" value and the other 4 have "bad" values. You need to make sure that you're using the "good" one. Steve ... View more

Ron If it is a new or recent Eval copy that should still be valid please contact Esri Tech Support Steve ... View more

Chris Have a look at http://arcpy.wordpress.com/tag/zonal-statistics/ ... View more

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 [email protected] ... 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