GeoSage is pleased to announce the release of unique, near-global imagery mosaics on shaded relief and natural-colour satellite imagery. Each mosaic map is a single large-sized, GIS ready JPEG2000 file, and it can be obtained on DVDs or external hard drives.
Seamless 90m-resolution hillshading maps are derived from the popular USGS SRTM data set. More than 14,000 raw SRTM tiles are first stitched into a single large mosaic with elevation gaps filled, and then a series of beautiful shaded-relief maps are cartographically designed and produced under various colour schemes and different hillshading settings.
Seamless 60m- and 90m-resolution satellite imagery mosaics are derived from the 30m-resolution Earth Land Surface 2000 imagery product, which consists of more than 880 regional tiles for the globe. These two imagery mosaics have the image sizes of 648,000 by 270,000 pixels and 432,000 by 180,000 pixels, respectively. Raw mosaics with the file sizes of a few hundreds of gigabytes
are compressed into efficient and accessible Jpeg2000 format.
The above mosaics are ideal for Gis baseline mapping and provide great context for vector data layers. They can be of significant use in regional and global environmental studies and landscape simulations. For example, since the 90m-resolution, shaded-relief map is 100 times more detailed than the widely-used SRTM30 or GTopo30 global mosaics, geological and geomorphologic features such as seismic faults and coastal fluvial plains can be much more clearly visualized and identified.
For more information please visit www.geosage.com.
