Latest Contributions by EricRice

Greetings, It's impossible to answer the question with the information you've provided.  It really depends on units and if you selected an area unit scale factor.  As an example consider that the lines have a projection that has linear units of meters.  The length of the lines will be in meters then.  If you run Kernel Density with the area unit scale factor set to Square Kilometers, the the output values will be in kilometers per square kilometer.  I would suggest reviewing How Kernel Density works for line features. Regards, Eric ... View more

Greetings, Areal Interpolation will be available in ArcGIS 10.1 with the GeoStatistical Analyst extension.  If you have a beta or pre-release version you can give it a try.  Regards, Eric ... View more

Randall, I think the first thing to clear up is whether or not the entire slope raster is the project area, or if you have some sort of polygon that represents a portion of the slope raster that is the definition of your project area.  I think you have a polygon that is a subset of the slope raster based on the title of your post. If the entire slope raster is the project area, you need to Reclassify the raster first because slope rasters are float and you need an integer dataset.  Once you have a reclassified slope raster, input it into the Zonal Geometry as Table tool. If you have a polygon representing the project area, run the Zonal Histogram tool on the slope raster (using the classified renderer with the correct ranges per class) using your polygon as the Zone features.  This tool will show the distribution (counts) for each class within each zone.  If you only have 1 zone (polygon) the results are very easy to interpret.  Counts can directly be converted to area by multiplying by the area of a single pixel and using some unit conversion factor to get whatever output units you want. Regards, Eric ... View more

Winn, I found that if you merge all three into one, then run Union 3D, you can get the desired output.  If I follow your workflow, I do see a crash.  I'm going to test 10.1 behavior and submit a bug if need be.  Did you try merging/unioning all of them in one shot?  We tested several 10.0 sp4 machines here and they all seemed to work fine. Eric ... View more

Rui, Open your model in Sketchup v 8 and save it to version 6. Go to Sketchup's File Menu > Save As.  Sketchup does not 'Export' to ArcGIS.  ArcGIS simply reads Sketchup files if they are v 6 or earlier (depending on your ArcGIS version).  There are two things you can do.  1) Symbolize a point with your model, which is especially helpful if your model has no spatial reference.  2) Run the Import 3D Files geoprocessing tool to convert the model to a geodatabase multipatch feature class. See Also:  How to import an existing 3D model into a multipatch feature class Eric ... View more

Rui, Esri products are only compatible with Google Sketchup v6, but not higher versions.  In Sketchup, you can save your model to a previous version. Eric ... View more

Marc, The Point Density tool would not produce that smooth of a surface.  The screenshot you provided looks a lot more like a Kernel Density result. Have a look at this other thread for additional graphics from both tools. http://forums.arcgis.com/threads/57382-Raster-Smoothing?p=197742#post197742 Eric ... View more

Ok - Thanks for the screenshot and info. Those features do not appear to be complex.  I would suggest installing SP4 at this point although I couldn't find a bug that was fixed to specificaly address this issue.  Can you contact Support to provide us the data? Or if it is small enough and your willing to, just zip it up and post it on the forum.  I can test it. Eric ... View more

Hi Winn, The set operator tools are highly memory intensive.  Do you have complex multipatches?  Can you post a screenshot of the input?  How much RAM is on your system?  What SP do you have installed?  Have you tried running it on a smaller dataset just to get the feel for how it works?  How was the input created?  Regards, Eric ... View more

Greetings, Have you tried using the Union 3D tool?  Eric ... View more

Hi Matthew, Zonal Histogram does not summarize the raster using all the polygons as one item.  It operates on each unique zone.  A zone is defined as all areas in the input that have the same value. The areas do not have to be contiguous.  If each polygon has a unique ID though, then it gives you what your looking for in the sense that each polygon will define the area being summarized.  If you have overlapping zones, the you should use the Iterate Feature Selection iterator and collate the results. Best Regards, Eric ... View more

Greetings Matthew, If you just want to use ArcGIS an not bother with 3rd party items, you can simply use the Zonal Histogram tool which enables you to investigate the frequency distribution of values in one dataset (your LULC raster)  within classes of another dataset (your polygons). Here is an overview of the zonal toolset.  There may be other tools that are of interest for your analysis. Regards, Eric ... View more

Hi Luke, It will be helpful to know what values your are getting.  Your workflow is fine.  Also, is it the slope values or the zonal results you are taking issue with?  What is the Z unit of the DEM?  Are you doing percent slope or degree?  Look forward to hearing from you. Eric ... View more