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Hi all, So I've solved this problem (hooray)! It seems that there is an issue converting the new NLCD layers (dated 02-14-2011) from ERDAS Imagine (.img) files to ESRI Grids. The USGS (creators of the NLCD data) have provided this work around to do the conversion: in ArcMap: 1. Add image (NLCD raster) 2. Zoom (or draw) area of interest 3. Export area of interest to GRID a. Extent = Data Frame (Current) b. Spatial Reference = Raster Dataset (Original) c. Rename the file name and select a desired output file format (i.e. GRID) d. Click Save *Ignore "Failed to Save Raster Dataset" e. click OK in ArcCatalog: 4. Arc toolbox - Data Management Tools>Raster>Raster Properties>Build Raster Attribute Table a. input grid file b. check Overwright c. run 5. Data Management Tools>Joins>Join Field a. Input Dataset = grid file b. Input join field = value c. Join table = (source NLCD image) d. Output join field = value e. Join fields d. check - Red, Green, Blue, Opacity, Land cover f. run While this work around does work, if you are using ArcGIS 9.3 as I am, you don't have the join field option in the toolbox, so I used python to do the last step (I can provide code on request). Thanks to Richard Vandersnick who supplied the work around from the USGS. Hope that helps! Katie
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03-17-2011
12:59 PM
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Ok, if I double check projections, I can still extract by mask on the 2006 NLCD dataset that I downloaded by zone (dated 02-2007). However, double checking projections does not solve the problem with the new national layer (dated 2-14-11). Does anyone have any idea why spatial analyst is not working on the updated data layers? Thanks so much! Katie
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03-16-2011
01:32 PM
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Hi all, I am having the same problem. I'm running ArcGIS 9.3 on Windows 7 64 bit. I have been able to run the extract by mask function in spatial analyst in the past (e.g. last time was Feb 28th, 2011) on NLCD 2006 data downloaded by zones (downloaded at least 1 yr ago) and it has always worked. I recently downloaded the national coverage NLCD 2006 landcover and impervious surfaces layer (.img) and now I can no longer extract by mask without getting the following error (this occurs with both the regional layer that was successful in the past and the national layer): ERROR 010240: Could not save raster dataset to C:\Users\Katie\AppData\Local\Temp\g_g_g2 with output format GRID. Failed to execute (ExtractByMask). I have tried the following steps to no avail: 1. update ArcGIS 9.3 with all available patches and service packs 2. update Windows 7 with all available updates 3. change temporary workspace in spatial analyst 4. change temporary workspace in Windows 7 5. clean out/empty temp workspace 6. change, shorten, or update names used to fit raster formatting rules Any help you can provide would be much appreciated!!! Katie
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03-16-2011
01:01 PM
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