Latest Contributions by SteveLynch

Patrick Yes it can take a long time. The barrier implementation is using a line of sight approach. I.e. from the location where you want a value it'll "look" to see which points are "visible" and then use only those. It'll also depend on the complexity of the barrier featureclass, i.e. how many vertices and on the number of input points and then on the number of output cells. You should, however, first test how long it takes without the barrier. Steve ... View more

- I guess you are in a geographic coordinate system (i.e degrees decimal), not a good idea as 1 degree longtitude <> 1 degree latitude. - default size cell produces an output raster of roughly 250 columns and 250 rows - with you changing the cell size to 1 will mean that your output raster will have roughly 1 row and 1 column - I notice that you are in a comma locale and using ArcGIS10, have you installed the latest Service Pack (SP5)? - 3.4e38 is a NoData value, which basically means that your output raster is empty. Regards Steve ... View more

What is the default cell size that shows up in the dialog after you enter the ga layer into the control? Please also state clearly what happens when you run the tool. I'm not sure what you mean by "I  have a similar problem." Thanks Steve ... View more

Such features are available through the geoprocessing environment. I.e. when using GP tools. The Wizard, however, does not honor these environment settings. You could, however, use the layer that you created in the GALayerToGrid tool and specify an output extent in the environment and your output raster will then have this new extent. Steve ... View more

If you are interested in mapping rainfall over southern Africa you should have a look at http://www.wrc.org.za/Pages/DisplayItem.aspx?ItemID=7656&FromURL=%2fPages%2fKH_AdvancedSearch.aspx%3fdt%3d%26ms%3d%26d%3dDevelopment+of+a+raster+database+of+annual%2c+monthly+and+daily+rainfall+for+Southern+Africa%26start%3d1 and http://www.wrc.org.za/Pages/DisplayItem.aspx?ItemID=8092&FromURL=%2fPages%2fKH_AdvancedSearch.aspx%3fdt%3d%26ms%3d%26d%3dMapping+mean+annual+and+other+rainfall+statistics+over+Southern+Africa%26start%3d1 Regards Steve ... View more

ERROR 000863: Invalid GP data type". Patrick The barrier feature class must be polyline. You might be trying to use a polygon FC. Steve ... View more

Delete all the temporary files in http://resources.arcgis.com/en/help/main/10.1/index.html#//0031000000p3000000 and reboot the computer. Run test on computer 1 and repeat the exercise on computer 2. How different are the times? ... View more

Try using a smaller extent or larger interval ... View more

What version of ArcGIS do you have? And, have you thought of using TopoToRaster which is in the Spatial Analyst toolbox? Regards Steve ... View more

Use the IsNull tool. Output raster will be integer with a table and the count for value =1 will be the number of NoData cells and count for value=0 will be the number of cell that have data ... View more

The most important factor for interpolation is that it only deals with a continuous variable. In other words something like rainfall or temperature. And not something like soil types or tree diameters. Cross validation should also be used to make sure that you are not totally wrong. Also, what do you mean by "seights"? Thanks Steve ... View more

grid name can't have a space. Try changing ct_ma test to ct_ma_test steve ... View more

On Linux the grid names must be lower case (same for coverages). Steve ... View more

Daniel Have a look at http://resources.arcgis.com/en/help/main/10.1/#/Working_with_large_datasets_in_Geostatistical_Analyst/0031000000p3000000/ Regards Steve ... View more

If you have point data on a grid (1m x 1m), why not use PointToRaster with an output cell size of 1m? If you do kriging, do you want to go finer than 1m? and are you interested in the standard error of prediction surfaces? Regards Steve ... View more