Latest Contributions by JeffLee

I see from your error dialog that the directory path has a dash in it.   this could be the cause of your error. ... View more

I would try ordinary Kriging.  If you have station elevations, I would use co-kriging with elevation as co-variate. ... View more

Andrew;     A couple of things come to mind.  First, Spatial Analyst does not like spaces in directory path.  Second, the raster is stored in a geodatabase and if I am not mistaken, Spatial Analyst converts the raster in the geodatabase to an ESRI grid format before performing the operation, Since your file name exceeds 13 characters, this may be where the error comes up.  Hope this helps. ... View more

Daniel;     Flow accumulation grids are generated from a 8 point flow direction grid.  I have downloaded one of your rasters and I see that the values range from 1 to 255.   Starting from the East, the values for the flow direction grid should be 1, 2, 4, 8, 16, 32, 64 and 128.  I suspect that the flow direction grid that you have uploaded were generated from an unfilled DEM, thus explaining the values that I am seeing. ... View more

I can think of two right of the bat.   You can do a select by location on your point file with the relevant polygon feature selected, or a point on polygon intersection. ... View more

Click on the add data button, the one with the black + sign with the yellow lozenge in the back. that should do the trick. ... View more

Dan; Create a grid or a feature class of the new cell extents and use spatial analyst to run a zonal statistics.  In the dialog box pick "mean" as the statistic to compute. ... View more

The model is looking for the spatial analyst extension.  It looks like it is not installed on your PC.  Unless the creator of the model has upgraded to 9.x you are out  of luck running that one on ArcGIS. ... View more

Julia;     The problem may be due to using a too coarse raster for your polygons.  For example, if only one cell intersect a polygon you may not get values as, if I am not mistaken, the centroid of a raster cell must be located inside the boundary of the feature for which you are making calculations. ... View more

Hi Guangli;     How are you doing? ... View more

If the tool is not in the toolbox, it's unlikely that you will be able to use it in python.  However, you may want to use the thin tool in spatial analyst to reduce the width of your features before converting your raster to vector.  The thin tool is accessible in python. ... View more

Shot in the dark,    Check for spaces in table names and directory path. ... View more

Angel;      If I am not mistaken, the maximum file size that the grid module can handle is 2GB.  However, on the practical side is probably half that size. ... View more

If I may add my two cents,  it may not be good practice to include hyphen's in directory path (i.e. D:\\J04-0083\\IMAGEFILES) when working with the grid module.  A lot of problems can be avoided by eliminating spaces and unusual characters in the directory path. http://webhelp.esri.com/arcgisdesktop/9.2/index.cfm?TopicName=Naming_output_rasters ... View more

if you have river cross-sections and you know the rate at which water is rising, a crude way would be at each time step, to assign elevations to each of your cross section, Build a TIN from your cross section elevations, convert the tin to raster and subtract the cross-section elevations from the DEM.  The positive values from the subtraction should give you the extent of your floodplain. ... View more