Version 1.0 of this GeoTIFF was replaced by version 2.0 in March, 2018 because version. 1.0 of the GeoTIFF did not reflect the current "build" of the terrain model. Version 2.0: Although the 2 issues [discussed in processing step 7 of metadata] were corrected prior to publication of ver. 1.0, the uncorrected terrain model was erroneously released. External sources.