Working with our aerial imagery partner, Hexagon (HxGN), we are happy to offer highly detailed 15-centimer (cm) and 30-cm stereo pairs as well as 20-cm and 40-cm digital surface models (DSMs) from an archive covering much of Europe and the United States.
Both of these elevation/3D products have the same geographic extent as our HxGN 15-cm and 30-cm aerial imagery layers and can be queried anytime on Image Hunter. The optical stereo pairs are delivered in both natural and false color at 15-cm and 30-cm resolutions (as is available in the archive). Here is a more detailed summary of the product specifications for these 15/30-cm high-resolution stereo pairs:
- 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
From these 15-cm and 30-cm stereo pairs, Hexagon has extracted 20-cm or 40-cm DSMs (respectively) which are ready for off-the-shelf delivery. Featuring exceptional horizontal and vertical accuracies, these DSMs cover much of the United States and Europe. Here is a more detailed summary of the DSM product specifications:
- DEM Type: digital surface model (DSM)
- Product 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), GeoTIFF (raster grid)
- Coordinate System (horizontal, vertical): UTM IRTF2008, EGM08 (Europe); UTM NAD83, NAV88 (USA)
* 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 HxGN aerial imagery coverage, including these new 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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