Latest Contributions by DanPatterson_Retired

symmetrical Difference if you have an Arc* advanced version http://resources.arcgis.com/en/help/main/10.1/index.html#//00080000000r000000 ... View more

read up on the use of OFFSETA which must be incorporated into the shapefiles table to represent a viewers height (ie 2 m or whatever your want), your observer point will be set above the ground by this distance.  Similarly, you can add polygon's and their heights to the DEM giving the allusion of not seeing through the forest. ... View more

It also sounds like the Define Projection was used on one of the files instead of the project tool.  I would add each file to a separate data frame and examine their coordinates visually ... View more

yes it does ... View more

did you try Con and IsNull?  they work with any grid ... View more

did you run it on a smaller dataset to do a time test to get an estimate of how long it would take to run?  Your input data set is very large and I would be surprised if it would finish in an appropriate period of time. ... View more

The issue would also have to account for flat roofs, ones with a particular slope, multipitched roofs.  So you are going to have to refine your question to deal with these cases.  But a combination of slope and aspect is a mental starting point. ... View more

I do as well, particularly Python code.  If you don't want it used by others, then make sure you include a distribution license agreement.  Alternately, you can embed code within a toolbox which those people over the age of 16 unable to unlock your code 🙂 😄 ... View more

You will need the 3D analyst extension...it has a profile/cross-section tool which will produce a graphical representation and a file which can be used for subsequent analysis ... View more

Project your data and calculate the slope ... View more

why not create a shapefile for those features that aren't null to reduce the number of calculations that need to be performed, then do the join ... View more

try shortening the grid name and direct it to a folder rather a gdb ... View more

On a related issue, I uninstalled 10.0 and Python 2.6 and installed 10.1 and Python win compatable with 2.7.2 and Pyscripter and I am getting a "cannot import arcpy" error message.  Is there some registry issue??? are these problems related/// ... View more