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Why does the Mosaic to New Raster tool take so long to mosaic 32-bit floating point GRIDs?
The decline in the performance, in ArcGIS 9.2 and later, is due to the time it takes the tool to accurately calculate the statistics for floating point grids. ArcGIS 9.2 calculates statistics using full resolution. This is an improvement from methods used in ArcGIS 9.1, where the Mosaic To New Raster tool estimates the statistics for a resampled layer.