Latest Contributions by EricRice

What version?  Support is the best option at this point.  They can get your data to repro the issue and submit a defect. Best, Eric ... View more

Greeetings, It's extremely inneffective to buffer the points, and subset the DEM based on each buffer for input into Viewshed. All you have to do is give each point an attribute for Radius1 and Radius2. R1 should be 0, and R2 should be the distance you would have otherwised buffered with. See, How Viewshed works, especially the section called 'Controlling the Visibility Analysis'. You probably should make use of OFFSETA as well. Since the goal is to determine the area that an animal sees, rather than what he sees you probably don't even need to keep the actual viewsheds. You should set the output to an in_memory workspace. You could also probably shorten the model by avoiding all the field calculations to determine area. Instead, insert the in memory viewshed result into the Zonal Geometry As Table tool (also use in_memory here). It will tell you the area of both visible and not visible for each iteration. To save a toolbox to a previous release, right click on it and go to Save As, then pick the previous version. Best, Eric ... View more

Hi Alisa, Do the rasters all have the same underlying grid?  In other words, do the rasters that are going into the mosaic, all have perfect cell alignment?  If they don't you should expect the value to change somewhat because they will be resampled.  What resampling do you have set in your environments?  Also, is there any overlap between the inputs?  What options were set in the Mosaic Operator parameter? If you have support, you should open an incident so an analyst can have a look. Best, Eric ... View more

Esri GRIDs don't have a size limit in ArcGIS, only in ArcInfo Workstation were they subject to a 2gb limit.  Why do you want to convert the Tiff to GRID?  I would remove the spaces to be sure.  You could also just try the Copy Raster tool. Best, Eric ... View more

You need 3d analyst or spatial analyst.  There is a tool called Times in both of them.  Input your raster and multiply it by the unit conversion factor.  It's a really straight forward tool, but let me know if you have any questions. Best, Eric ... View more

Bernard, The linear unit has to do with coordinate system (X,Y) units, not the pixel (or Z) unit. You have to know this (local knowledge of terrain), if it is not in any metadata. There is nothing in the layer properties for the unit of the pixel - many rasters, like a landuse raster don't have a concept of units. Unless there is a giant cliff, two pixels on either side of the black seam shouldn't be 3x smaller/larger. It basically confirms that your are mosaicking data with different units. You have to pick a unit, convert any rasters that are not in that unit by multiplying by the correct unit conversion factor, then mosaic. Best, Eric ... View more

If the workspace is a folder, then you are writing an Esri GRID raster. If the workspace is a geodatabase, then you are writing a geodatabase raster. Neither would require you to specify an extension with the name. Are you sure you aren't mixing different units of data when creating the mosaic? Often I see a line like yours when people mosaic data that is in feet with other data that is in meters. If you identify a pixel on either side of the black line is one ~3x bigger than the other? Best, Eric ... View more

Jamal, How did it work for you?  Any questions on the model? Best, Eric ... View more

Ryan, What happens when you apply a hillshade function to the mosaic dataset?  You know you can make a reference mosaic dataset from the original right?  One would have the hillshade function, and one would be the dem, both from the same source data.  If you have Support I would suggest creating an incident so an analyst can connect with you.  Also, in the blog I sent, there is a link to another blog that only uses functions, rather than the image analysis window to create the hillshade and layer tint.  The other blog indicates you need a colormap file though, which you would have to create. Lastly, have a look at the shaded relief function.  It's like hillshade but it colored.  Best, Eric ... View more

Jamal, The attached zip file contains a geoprocessing package I created in 10.1. Drag it into your map, go to the results tab under Shared, and rerun the tool with your inputs. If you want to see the model, right click the tool and select "Edit". Once the model is open in model builder, you can Save As to save a local copy. Best, Eric ... View more

Ryan, You should be able to input a mosaic dataset into the Hillshade GP tool assuming your not exceeding the maximum request size limit specified in the mosaic dataset properties.  The tool would fail if it requested more than allowed.  It wouldn't process anything, so there is something else going on. If the goal is to make a tinted hillshade using some transparency on the DEM (with color) overlaid on the hillshade, you can still do this with just functions.  Check out the blog, An alternative to overlaying layer tints on hillshades. Eric ... View more

Ryan, Have you thought about using a hillshade function on your mosaic dataset?  That way you don't have to store the hillshade.  It will be produced on the fly from the source dem data. Eric ... View more

Jamal, You can do this in model builder using Summary Statistics, Zonal Geometry as Table, plus Add/Calculate/Join Field. There is no python required, just an understanding of in-line variables and preconditions. Here is the input table, output table, and model in screenshot form. If you have questions, feel free to ask. Best, Eric ... View more

Ken, I used WinRAR to extract the data.  The forum will not let me attach this format directly.  It would need to be zipped again. WinRAR is free if you can get approval to install it.  WinZip should also work when dealing with .TAR.gz files. Eric ... View more