![]() You are still able to use the Mosaic tool even if the raster datasets have different color maps however, you must choose the proper color map mode. When mosaicking with raster datasets containing color maps, it is important to note differences across the color maps for each raster dataset you choose to mosaic. Geodatabase rasters will work without this extra step. Whenever possible, use the Last Mosaic Operator to mosaic raster datasets to an existing raster dataset in a geodatabase it is by far the most effective way to mosaic.įor file-based rasters, Ignore Background Value must be set to the same value as NoData for the background value to be ignored. The Blend and Mean Mosaic Operator options are best suited for continuous data. The Target Raster is considered the first raster in the list of input rasters.įor mosaicking of discrete data, First, Minimum, or Maximum Mosaic Operator options will provide the most meaningful results. For example, you can keep the color map of the last raster dataset used in the mosaic. ![]() There are also several options to determine how to handle a color map, if the raster dataset uses one. The overlapping areas of the mosaic can be handled in several ways for example, you can set the tool to keep only the first raster dataset's data, or you can blend the overlapping cell values. ![]() Some mosaic techniques can help minimize the abrupt changes along the boundaries of the overlapping rasters. Mosaic is useful when two or more adjacent raster datasets need to be merged into one entity. The target raster must be an existing raster dataset, which can be an empty raster dataset or one already containing data. Learn more about mosaicking raster datasets Illustration Usage Set the method to Geocentric Translation and leave the parameter values set to zeroes.Merges multiple existing raster datasets into an existing raster dataset. If it appears to be offset north-south, try adding a custom geographic transformation (there's a tool) between its GCS and NAD83 or WGS84 whatever you're using. Does it appear to overlay? Then you're good to go. Try just adding the raster with your other data, ignore any transformation warnings. There's no predefined transformations between a sphere-based GCS and a geodetic GCS (AKA one based on a true geodetic datum). Your next question may be on what geographic/datum transformation should be used to convert to NAD83 or WGS84-based coordinate system (or to overlay it with that type of data). prj, then you can import it through the raster's property page in ArcCatalog or the Define Projection tool. PROJCS],PRIMEM,UNIT],PROJECTION,PARAMETER,PARAMETER,PARAMETER,PARAMETER,UNIT]Ĭopy it as a single line to a text file, change the text file's extension to. Lambert azimuthal equal area has always supported non-polar cases in ArcGIS for Desktop, and did in Workstation too.Īnyway, here's the well-known text string for the definition: You would have to define a custom projected coordinate system in ArcGIS, but it's certainly do-able. That also has no effect on the raster.ĭoes anyone have any ideas or could help me out? I've also tried uploading a vector layer (basic US states layer, WGS 1984) with known spatial reference before uploading the raster. ![]() I've also attempted to find a complementary projection as Arc only has a polar Lambert Azimuthal Equal Area which does not work in this circumstance. I've attempted to manually input the projection centers when setting the raster spacial reference but don't see any change when it runs.
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