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Hi, You can define a projection for the raster. But reprojecting requires to write out the dataset again. MrSid is not an out-of-the-box writable format for ArcGIS. You would need a special license for that. But you can write out to other formats such as IMG or Jpeg2000. Robert
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02-04-2011
03:22 PM
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Greetings, Have you looked at the Image Analysis window and the clip / mask buttons? They are very easy to use and give you quick results. The window is new at 10.0 and can be accessed from windows > Image Analysis. Robert
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02-04-2011
03:20 PM
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Greetings, You can try to use the output bit depth on the general tab in the function chain (layer properties > function tab > your function that you want to change). However, I don't know what will happen if you change the output from 64 to 8 bit (if it scales or truncates). But that might help. I don't know of a way to apply functions like this through python. You can do this through the API if you want to go that route. You can use the layer as input to geoprocessing tools as well. Robert
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02-03-2011
03:01 PM
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Hi Allison, What format are you trying to output to? And what version are you using? If your output is tiff and you use 9.3 or previous, then be aware that tiff has a size limit (I think 4GB). What is the "uncompressed" file size in the ecw dataset properties? Thanks. Robert
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02-01-2011
06:41 AM
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Greetings, You can use the clip geoprocessing tool to clip based on a feature (or use data export for a graphics). Make sure you set the nodata value and you should be good to go. Robert
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01-27-2011
09:29 AM
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Greetings, If you're trying to visualize your tin and image in 3d, then you probably want to use ArcScene or ArcGlobe (depending on what you are trying to accomplish). Try to load your tin as the elevation data and then drape the image over it. Is that what you're looking for? Robert
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01-26-2011
06:53 AM
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Hi Andy, For of the Image Analysis window, the input layers take precedence over the default ArcMap settings. So if you change your input layer with contrast and brightness, and then clip (for example), then the clip will also have these contrast and brightness settings. These settings come from the top layer in the layer list. I think this is done to preserve the changes you have done to the layer. Regarding the resampling technique, this is done through display resampling at this point. Note that you can easily change the mosaic method (min, max, blend) even after the new layer is created by simply selecting the new layer and then changing the mosaic method on the image analysis window. I hope this helps. Robert
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01-24-2011
09:00 AM
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Hi Luke, Can you use the identify tool to see what your output pixel values are? Robert
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01-19-2011
06:45 AM
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Hi Bruce, Yes, the mosaic dataset has several ways to calculate statistics, and it holds different kinds of statistics also. This can be confusing. There is a help topic for this online. Please try to calculate statistics for the mosaic dataset using the calculate statistics geoprocessing tool. For speed you could specify a skip factor if you want. This should definitely work. Robert
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01-19-2011
06:41 AM
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Hi Mary, There is some sample code online regarding an attribute table and using the unique values renderer. I hope these help. Robert
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01-06-2011
07:12 AM
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Greetings, What format are you outputting to? In general I would suggest using common formats that can hold just about any bit depth such as TIFF or IMG. GRID is also ok if you consider the length and other limitations. Robert
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01-06-2011
06:39 AM
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Greetings, So the problem with the black border is that most often these values are zero's (0). However, once you compress the data with compressions such as jpeg or jpeg 2000, in order for the compression to work as nice as it does, it changes some of these values. Hence, when you say background 0,0,0 is nodata, you start seeing the black speckles. Resolving this is more tricky. You can clip the black border and write out a new dataset (possibly undesirable because of time and space constraints). If you have 10.0 you could use a clip function based on a graphics or feature to accomplish the same in-memory. If you have 10.0 and are using the mosaic dataset, then you can recompute the footprint to accomplish the clipping automatically. Hope this helps. Robert
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01-04-2011
06:55 AM
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Hi Brian, You can load this data into SDE but you don't have to. It depends on your organization and how you want to handle this amount of data. If you have ArcGIS 10.0 you can test with creating a mosaic dataset in SDE (or file geodatabase) and load the tiles on disk (on the hard drive, not SDE). This should be pretty quick to create (considering the amount of data) so you can see if the performance is better or not. You can serve out the mosaic dataset with the extension. If you have a lot of concurrent users then you can also use it to create a map cache. Other benefits include you can download from the mosaic dataset (or turn it off) and it's easier to find the tile you're looking for if you have a lot of data. I'd suggest you try it to see if it suits your needs. There are some help topics for mosaic dataset and managing large amounts of rasters in SDE. Robert
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12-29-2010
07:32 AM
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Hi Brian, Do you mean you created a single raster dataset in SDE that is 600 GB in size? Is there a specific reason you load the data into SDE? If you already have statistics and pyramids built, then sometimes analyzing your SDE can help (rebuilding the spatial index etc to improve performance). A different way to manage all this data is to use the Mosaic Dataset at ArcGIS 10.0. It's designed to help you manage large amounts of data like you have. You can also serve it out (with a server extension) and you don't have to load the data into SDE. You can create the mosaic dataset in the SDE and it references your data on disk. More information on the mosaic dataset Analyze Geoprocessing tool for RDBMS Hope this helps. Robert
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12-29-2010
06:48 AM
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Josh, You could also try using the spatial analysis CON tool. This is very similar to a programmatic "if" statement. Robert
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12-21-2010
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