Latest Contributions by SteveLynch

That equates to a 288 x 288 columns x rows raster, which is small. - What type of raster, Esri grid, img, tiff, etc. - Is the join persisted? - What happens when you throw it into CopyRaster or ExtractByMask? Thanks Steve ... View more

if the field in the raster attribute table is integer then Lookup will create an integer raster and if the field is float then Lookup will create a float field. i.e the type of the field dictates the output raster type Steve ... View more

A few comments... The signature for Con in pre ArcGIS 10 is - Con_sa <in_conditional_raster> <in_true_raster_or_constant> <out_raster> {in_false_raster_or_constant} {where_clause} and from 10 onwards we have output on the left hand side and the signature is - Con (in_conditional_raster, in_true_raster_or_constant, {in_false_raster_or_constant}, {where_clause}) If the geoprocessing tool exists then one need not use it inside the RasterCalculator tool. However, in some cases you can, for example (in ArcGIS10) Con("elev", 0, 1, "value > 1000") - where the cell value > 1000 use 0 else use 1 can be written in Python or in the RasterCalculator as Con(Raster("elev") > 1000, 0, 1) Regards Steve ... View more

the syntax (from the help) Con(in_conditional_raster, in_true_raster_or_constant, {in_false_raster_or_constant}, {where_clause}) ... View more

Esther See  http://forums.arcgis.com/threads/3644-Generate-a-grid-of-latitude-values?p=74323 ... View more

Dean Firstly, what type of precip data, hourly, daily, monthly, annual, mean annual, etc.? Secondly, higher elevation does not always mean more rain, there are rain shadows, for example. So you may need additional info. In studies that I did many years ago I found that distance from the sea and surface roughness also played an important role. Also the rain-bearing direction. An extensive literature search will help 🙂 Regards Steve ... View more

Have you set your Processing extent = to that of the polygon? This is done via the Environment. Steve ... View more

It is in ArcGIS version 10.1 ... View more

Lauren If you are using ArcGIS 10 you can use CellStatistics. Input raster=small raster and in the environment set the processing extent=larger raster. Steve ... View more

While doing a search did you find http://resources.arcgis.com/en/help/main/10.1/index.html#//009z00000078000000 ? Have you looked at the 2 references ? Regards Steve ... View more

also if you are using ArcGIS 10, you could use CellStatistics and set the extent to Union of.. see http://forums.arcgis.com/threads/59895-Combine-Rasters-using-Con-Expression-Error?highlight=cellstatistics Steve ... View more

Please see http://forums.arcgis.com/threads/34053-Interpolation-for-Precipitation-Grid ... View more

Dean A Geostatistical layer cannot be masked per se. You can, however, clip the data frame. (in ArcMap, right click the Layers in the TOC and choose Data Frame Properties and supply a clipping polygon). In 10.1 you can supply a MASK via the environment when using the GALayerToGrid tool. Pre 10.1, you can use Spatial Analyst's Plus tool to add zero to your exported raster and supply a MASK in the environment. Steve ... View more

You need to set the output extent = max of the input rasters Steve ... View more