Sometimes specifications evolve with new products and we are happy to announce once such evolution that significantly improved our Hexagon digital elevation models (DEMs) over the United States and Europe. Specifically, we are happy to announce that Hexagon DEMs are now available as 20-cm and 40-cm digital surface models (DSMs) from an archive covering much of Europe and the United States!!
These newly released 20-cm and 40-cm DSMs feature exceptional horizontal and vertical accuracies, and are ready for rapid delivery over much of the United States and Europe. Here is a more detailed summary of the revised Hexagon DSM product specifications:
- DEM Type: digital surface model (DSM)
- DSM Resolution*: equal to nominal stereo ground sampling distance (GSD), which is commonly 20-cm or 40-cm
- DSM Product Formats: 1X stereo GSD, full resolution point cloud; 2X stereo GSD, de-noised point cloud; 4X stereo GSD, intermediate resolution point cloud; and 5-m raster grid
- Geographic Coverage: Europe & the United States (as available)
- Horizontal Accuracy (XY): 1.2-m RMSE, 2.6-m CE90%
- Vertical Accuracy (Z): 2X stereo GSD
- File Format: compressed LAZ (point cloud), or GeoTIFF (raster grid)
- Coordinate System (horizontal, vertical): UTM IRTF2008, EGM08 (Europe); UTM NAD83, NAV88 (USA)
While the product specification for the DSMs has changed, the Hexagon stereo product specifications remain unchanged:
- Stereo Pair Resolution*: 15-cm and 30-cm
- Geographic Coverage: Europe & the United States (as available)
- Spectral Bands: natural color & false color (CIR)
- Bit Depth: 16-bit
- Horizontal Accuracy (XY): 0.5-m RMSE, 1.07-m CE90%
- Product Format: GeoTIFF with appropriate stereo models and exterior orientation parameters
- Coordinate System: UTM IRTF2008 (Europe), UTM NAD83 (USA)
- Nominal Stereo Ground Sampling Distance (GSD): ~20-cm for 15-cm aerial locations; ~40-cm for 30-cm locations
- Control Systems: onboard GPS/IMU plus bundle adjustment with ground control points
* Please note that in some limited cases, regional Hexagon elevation datasets are available at a reduced resolution for both DSM and stereo pair products.
15-cm and 30-cm Hexagon (HxGN) aerial imagery coverage, including these high-resolution DSM and stereo imagery products, can be searched for anytime on Image Hunter. If you would like additional details and/or pricing on any of these product offerings, send us an email at sales@apollomapping.com and we will get right back to you!
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