Latest Contributions by DanPatterson_Retired

What is the error? What is the extent of the raster? Are you trying to create the raster in a folder path that contains a space? ... View more

Good point ... a quick Google search using "circular statistics" will provide numerous links on how to derive 'circular' or 'directional' statistical parameters from input data. ... View more

Did you rule out some of the information that can be obtained from ZonalStatisticsAsTable? http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//009z000000w8000000.htm ... View more

Check out the IsNull tool in the spatial analyst toolset, it will produce a grid of 0's or 1's, simply open its table to get the cell count. ... View more

Others note for future reference the $$YMap doesn't work in arcmap 10, but can be emulated.  This will enable you to provide a value for the projected grid, however, the actual grid cell area in the projected data doesn't change. ... View more

Must be a quirk of server stuff, if you remove and re-add a file to Arcmap, the alias isn't carried over.  Perhaps one of the appropriate web/server forums might address this better. ... View more

I would first confirm that there are no NoData values in the field, then use the field statistics option.  You should also note that the population standard deviation is returned and not a sample standard deviation.  Should you require other statistical parameters, and you are using ArcGIS 10, then see http://resources.arcgis.com/gallery/file/geoprocessing/details?entryID=BDF21676-1422-2418-34E6-A29C6BAC8A0B after querying for valid data entries. ... View more

Would something as simple as removing the featureclass from the project and adding it back in be sufficient? ... View more

Ok, now when the cell size is in decimal degrees (ie 0.1 x 0.1 decimal degrees), then you are correct that the area of each square decreases as you go poleward.  However, when you project data, it converts if from decimal degrees to a planar system (usually meters) and the cell size would be X meters by X meters and you could need more cells in the southern portion of the study area than the northern part of the study area (assuming the N hemisphere here, flip that if you live south of the equator).  The point I was trying to make is that the cell sizes in projected data will be identical regardless of where you are, but, how well does the projection represent area in the first place. ... View more

Each cell in a projected raster represents the exact same area on the ground.  How well the projection maintains area is another issue ... View more

This question is confusing.  If the cell values are >0 do you simply want to subtract 1 from each value?  If so, then use the raster calculator to subtract 1 from the grid and produce a new grid which will be 1 less than the input grid. ... View more

This would be a welcome and useful addition ... View more

No problem ... View more

Note that Aggregate (Cartography) http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00700000000s000000 requires an ArcInfo license of ArcMap ... View more

Why not produce a summary table rather than having the redundant values in the origin table? http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//005s00000055000000.htm ... View more