Latest Contributions by SteveLynch

Bruce You have a polygon feature class that you want to convert to a raster, correct? - what coordinate system are you using, projected in meters I guess? - what is the default cell size that appears in the PolygonToRaster tool? - what cell size should the output raster have? -Steve ... View more

Alexis I'm glad to hear that you've solved your problem. A raster attribute table can only be created for integer rasters and Curvature produces a floating point raster and that is why you could not build a table. -Steve ... View more

good. However, if your points are on a grid you don't need to interpolate. You can use the PointToRaster tool, that is, if each cell has at least one point. ... View more

yes, cell size. ... View more

Are there any adverse effects of having cell sizes as low as possible? - processing time - size of output raster - at some point you are not gaining anymore information You have to think about the scale at which you phenomena changes. Say you decide on 30 meters, that means that each 30x30 meter area has the same value. If you have access to Geostatistical Analyst you can perform cross validation to decide which interpolator produces the best results. ... View more

Mike As far as exact interpolation, please reference the following image. 2 cells of a raster, white equals the cell center and red is the sample location. Predictions are made at the cell center and that value is assigned to the whole cell.  When predicting the value for the upper cell, 1395 will carry the most weight and therefore the cell's value will not be equal to 1395. However, 3199 falls exactly at the center of the cell and therefore that cell's predicted value will be equal to 3199. The smaller the cell size the closer the predicted cell value will be to that of the sample point Regards -Steve ... View more

...and also read the usage tips of the Contour tool. ... View more

Charles Are you running it in background or foreground? Please post a screen shot of the dialog before you hit run. Thanks -Steve ... View more

The station's coordinates are in lat, long. Does this mean that they are in degrees decimal?  ... View more

add 0.5 before you cast to int. ... View more

- you are sending the output to an Esri grid named "D:/Documents/PhD/GIS/Odhran", correct? - specify the full path to mygrid.asc - these ASCII files are actually raster datasets and you could use CopyRaster ipo ASCIIToRaster ... View more

Background geoprocessing is by default = 32 bit, to get the 64 bit version requires an additional install. Felipe, - from the UI it succeeds in background and in foreground, correct? - try sending the output raster to Esri grid or .tif ... View more

When it succeeds, what is the size of the output raster? (Right click on the raster layer and have a look at the number of columns and rows)? Did you install Background 64 bit? Does IDW succeed in foreground? Are you running the geoprocessing tool from the UI or are you running it in the Python window? ... View more

Please navigate to the folder where the shapefile is stored and zip all the files making up the shapefile and email it to me at [email protected] I suspect that you have a corrupt shapefile. ... View more