Latest Contributions by EricRice

So you got all the records you expect using 5m cells? Best, Eric ... View more

Generally there are two main reasons why the conversion to raster results in fewer records than the input. 1. There is overlap within the polygons.  When converted the underlying pixel can only be one value, not both.  So one is discarded. 2. You have chosen a cell size (or accepted the default) that isn't appropriate given the size of your smaller polygons. If the areas of single features are similar to or smaller than the area  of single cells in the value raster, in the feature-to-raster conversion  some of these zones may not be represented. Both of these topics are covered under Usage in the Zonal Statistics as Table doc, including tips to get around. Best Regards, Eric ... View more

The complexity of the inputs is a likely cause as well. Working with 3D set operators "Some 3D set operators are fairly process intensive and may take longer to execute. For example, Difference 3D and Intersect 3D require  iterating through every feature in one input feature class, once for  each feature in the second input feature class. Each iteration involves  determining whether two features overlap, then computing their geometric  intersection and writing a new unique feature. As a result, care should  be taken when deciding what feature classes to use as inputs to these  tools, regarding size and complexity of data." Generally people use these tools to take simple shapes and make more complex outputs, rather than throwing very complex 3d objects into it to create even more complex shapes. Best, Eric ... View more

Why not just use Zonal Statistics as Table with the stat set to MEAN?  The tool has an option to ignore NoData in the calculation.  It's on by default. Your use-case is the reason this tool exists.  You don't have to do a workflow to get an answer.  This is the 'better approach' you speak of. Best, Eric ... View more

Data formats supported by the ArcGIS Spatial Analyst extension.  See "Output raster data formats". Best, Eric ... View more

ArcScene doesn't support ArcGIS Server services.  See Functional differences between ArcGlobe and ArcScene. Best, Eric ... View more

Jeff, How are you determining what the SUM of an individual raster is?  Are you doing it the way Duncan was...by looking at the classification statistics window?  As a side note, you need to include the 'info' directory associated with these GRIDS you uploaded.  Without you sending that, the data you posted is basically corrupted.  Best, Eric ... View more

Can you show us the layer properties of the two inputs, in particular their projection and extent information?  What were your steps to project the data to UTM?  It might help if you clarify what you mean when you say, "viewshed takes no account of the radius".  Viewshed doesn't clip the output by the radius value.  Everything outside the value should be returned as non visible, but you're still going to get the full extent returned to you.  Now if you're seeing 'visible' cells beyond the radius 2 value, then there is something gone awry or there is still a unit mix up somewhere. Best, Eric ... View more

Try renaming .jgwx to .jgw and see if AutoCAD recognizes the world file.  The "x" is specific to ArcGIS. World files for raster datasets  Check out the section "World file naming conventions". Best, Eric ... View more

ArcGIS can certainly write Tiff files.  MrSID on the other hand is proprietary  format that we do not write, but can read.  The Project Raster documentation should tell you the output formats it can write.  Keep in mind the data is going to uncompress (unless you tell it to recompress) during projection.  SID's can have pretty high compression ratios.  If your SID is large you should probably check the uncompressed size in the layer properties to make sure you have enough storage to store the projected raster. Best, Eric ... View more

Go here: http://www.arcgis.com/home/group.html?id=ac62a64368954d2a832e05697ba0340f Join the group.  Then you should have access. Note, access to these services will be changing somewhere in the 1-2 month horizon.  By joining the group you ensure you receive notifications about the upcoming changes.  My understanding is that they will remain 'free', but other requirements will have to be met for them to remain free.  I'm not actually involved in managing these services so it's best to rely on the groups communication to group members. Best, Eric ... View more

Esri publishes worldwide elevation data for free, and includes products like slope, aspect, and hillshade dynamically.  See, What are the World Elevation services? Best, Eric ... View more

Hi Eric Is there any way to controlling it by setting a Mosaic Dataset properties? If the manager thinks that the default stretch is not so good s/he cannot go into each user machine and change it. More than that �?? some other rasters might be better with the default stretch but not all of them. Thanks Mody Did you read part 2 of the blog I linked to?  Check that out and let me know if you still have questions. Best, Eric ... View more

Hi Mark, Go to Customize > ArcMap Options > Raster tab > Raster Layer sub tab and set the default to None.  Also see this two part blog on this exact topic. http://blogs.esri.com/esri/arcgis/2012/09/19/stop-stretching-my-imagery-please-part-1/ http://blogs.esri.com/esri/arcgis/2012/09/26/stop-stretching-my-imagery-please-part-2/ You can also check out the help topic, "Setting default raster display options" which documents this as well. Best, Eric ... View more