Latest Contributions by JeffreySwain

If you are just trying to change the display of the raster in ArcMap it is not necessary to alter the value for NoData. Simply add that value as the background value and then make it no color in the layer properties.  The another way if you want to change it, would be to use the Copy Raster tool to create a  new raster and then define the nodata value differently. ... View more

Have you considered getting the DEM from a more recent dataset than an eoo file?  I would recommend downloading the data from USDA Geospatial Data Gateway or USGS Seamless.  There are also other listings of raster holdings on this blog and the raster wiki. I think the data provided there should be more up to date and ready for your analysis. ... View more

I am also curious about the compression that your tifs use.  Can you please indicate what the compression says under the Properties > Source Tab.  I have seen tifs with YcbCR compression exhibit the same slow performance that some sids produce.  For the test cases that I have seen, the compression is often nearing the 20:1 that you see with SIDs.  You may also consider not using the pyramids with your tifs and generate more overviews.  If you are seeing the slow performance when you are accessing those 6 inch tifs, then perhaps this is the issue. I would recommend considering recreating the image service with more overviews by ignoring the pyramids with your tifs.  To ignore the pyramids with the tif, open the raster pyramid options and set the maximum levels to 0.  When you generate the overviews for that mosaic dataset you should see more overviews generated.  If the pyramids with the tif are causing the slow performance, then the additional overviews will improve that. ... View more

While Robert discussed the coordinatesystem, he did not discuss the spatial extents.  I believe the reason that you are getting the incomplete results are that the spatial extents are different or at least on one raster there are nodata values in places that you would like to replace.  There is a blog that discusses some of the options, but basically if you want continous data from both rasters, you have to be sure you have complete coverage for both rasters. This can be obtained best by mosaicking the two rasters together to get the combined spatial extent and then convert that raster to a constant raster with a 0 value.  This will create the combined spatial extent that you want.  Afterwards create two new rasters, but mosaicking the individual rasters with the new base and be sure to select maximum for the mosaic method.  Now the new rasters will maintain the same values, but have a shared extent.  Your con statement should work with the original syntax now. ... View more

The ascii file will generally not have statistics created for them, so the default behavior of a standard deviation stretch will not occur so you will have the black box.  However, if you use the Ascii to Raster the statistics will be created as the new raster is created, unless you disable it manually.  So when this new file is added to ArcMap, it will display as expected.  So you do not have to use the Ascii to Raster, but if you want it to display you will have to generate statistics. ... View more

I would recommend creating an unmanaged raster catalog or a mosaic dataset.  The Image Catalog format is not used much at all anymore.  The mosaic dataset can accomplish what you want about keeping the higher resolution on top of of the other datasets.  Both of the recommended formats will allow you to keep the imagery in native form and then display as one continuous dataset in ArcMap. I am not sure what to do about your other software, but that format is no longer used. ... View more

So you have turned on the extension, added a raster symbolized as two values (either by unique or classified), added a polyline feature, selected it in the template window and turned on an edit session?  Can you send me a screenshot of your map document with just those features added and the editing session open? ... View more

What have you increased the downloads to?  Have you put a value in larger than your total source rasters plus overviews?  Or just adjusted the rows and columns?  The options are collected as columns and rows, so the columns and rows option should be greater than 19000,5335 and like I mentioned before increase the total number of number or records returned, the maximum number of rasters per mosaic and the max number of downloads.  In my testing here, once I increased the values to exceed what was available in the mosaic dataset, It worked.  I am also assisting on your incident if you reply to that as well.  The only other question I have is if you are trying to get the entire raster into MicroStation, why not simply export the mosaic dataset and then add it there, rather than try to get them to download the export this way? The purpose of the image service is to make it more convenient not more problematic than pushing out the actual raster.  The output from the REST page is just a new raster that is not in as fine a resolution as the original. If you are not consuming it over the internet, but consuming it locally, why create a new coarser version?  The download capabilities that you are modifying on the mosaic dataset are configured that way to allow some access to the underlying rasters via the web, but if you are trying to basically create a new raster from the web, there are easier ways. ... View more

Can you check and see if you have the statistics generated for the new raster?  If so then be sure to turn on the standard deviation stretch under properties > symbology.  If you do not have statistics then you will be prompted.  If you see the black square and then see the full range of options for your bit depth, most likely there are not any statistics for your raster. ... View more

What version of ArcMap are you using?  If you break it down to just running the top selection will it work?  If you are using 10, you may have to reference the raster differently. outRas = Raster("inras1") + Raster("inras2")  From the help documentation here about accessing rasters. ... View more

Based on the help, the information for slope and aspect must be added to the individual points in the locations file.  So add the values to that feature like you would for the viewshed into the input file. ... View more

In testing here, I had to make a few changes to my default properties to get an output of greater than 6,000 by 6,000.  I adjusted 4 different settings in order to allow the REST page to return the values.  In addition to the Maximum Size of Requests, I also adjusted the number or records returned, the maximum number of rasters per mosaic and the max number of downloads. After the service was re created here, it was possible to return an REST request of greater than 7,000 by 7,000.  In your provided example the largest export I could achieve was 15,000 by 4,100, which seems to indicate that you have not adjusted the default setting of 1,500 by 4,100.  I would recommend adjusting the default properties as explained.  Once they are changed you should be able to get the desired results.  Also be sure to clear the cache after changes are made to see them.  Working Rest request with your data. For my test, I used 227 combined tifs and overviews that covered total of 30,720 columns and 28,672 rows.  When I increased the values indicated to exceed the total number of rasters in the mosaic dataset, the larger area was able to be obtained via REST. ... View more

If you are not interested in something like the Image Analysis Window for the NDVI or in the procedure to create the look in a mosaic dataset, then I would recommend creating a dummy raster with the full range of values and create a layer from that output.  That layer can be applied to all of your other rasters. ... View more

It is an Image Analysis Window, and it is a new window for ArcGIS 10.  You should be able to activate the Window under the Window Menu. ... View more

I would be curious to know what video card you are using.  You have plenty of RAM and have made the change for the virtual memory, but depending on the video card there still may be an issue.  Based on experience there are occassional issues with certain AMD/ATI cards that are not reproducible with Nvidia cards, but I encourage you to run this to test out your overall settings.   Here are the recommendations for approved video cards.  Also depending on your system, if you create a 3d object you like, I recommend using the Layer 3d to Feature to convert it to a multipatch, which is not as memory intensive to draw as the extruded polygon.  Also consider smoothing or generalizing your polygon if it is densified to alleviate some of the issues.  Finally, remember that ArcScene utilizes a lot of memory, so if you have two monitors, put ArcScene on the main one.  Also try turning off any other memory intensive programs prior to running it.  I am sure you already have this document, but there are still the recommendations to optimize. ... View more