Landmark Historic mapping are only 1 band GeoTiffs. When being loaded into a Raster Catalog the colormap is causing the problem as you specified. Deleting all the values under the colormap will display all the GeoTiffs as stretched when loaded into a Raster Catalog The process is found below. Using the "Delete Colormap" tool found in the Data Management Tools under the Raster tool set, on all the GeoTiffs before placing them into a Raster Catalog. This removes the colormap values. Once this process has finished load all the rasters into a Raster Catalog. When displaying the Raster Catalog containing all the Historical Mapping click on properties and select the symbology tab. (Note under the Colormap option no values are displayed) Select to display the Catalog as Stretched, Tick the box next to "Display Background Value:" and type in a value of "1". Once this is applied the White value ("1") will show as null color and all tiles will be visible overlapping each other You can now join this to any Tables or Vector files with containing the Dates for each tile, and use the Time slider tool against it. This will fix the problem Regards Lewis George
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