Processing Levels

Level-1B

Wyvern's hyperspectral imagery data products that are delivered in Level-1B (basic) processing level are both geometrically corrected via georeferencing to map-projected north-up Geographic WGS84 (EPSG:4326) coordinate system and radiometrically corrected to at-sensor radiance pixel units based on spacecraft location plus pointing along with solar conditions at time of data acquisition. Wyvern's Level-1B (L1B) processing level imagery product is delivered as a raster dataset with 32-bit floating point (float32) data type where the pixels represent at-sensor top-of-atmosphere (TOA) radiance that is already in units of 'W / (m2 * sr * µm)' with no need to apply any scaling factor. Wyvern's initial Level-1B (L1B) imagery product is being delivered with adequate metadata to enable industry-standard radiometric & geometric data processing along with advanced analytical techniques such as deep learning, machine learning, spectral indices, classification, anomaly detection, material identification, sub-pixel mixture analysis, and spectral target detection. Wyvern strives to deliver all imagery data products in a manner that preserves as much of the ground sample distance (GSD) and inherent resolving capability of the imaging system on the Dragonette satellites as possible. Since the L1B imagery data product is delivered in Geographic WGS84 (EPSG 4326) coordinate system the spatial X & Y cell size of any given image pixel is defined in angular Longitude & Latitude degree units. In order to preserve the inherent GSD the pixel cell size for any given imagery data product is set as the Longitude & Latitude angular degree equivalents of X = 5.0 m x Y = 5.0 m spatial size for the latitude location of the center of the image scene. Consequently, the pixel cell size in Lon & Lat degree units will be non-square and vary based on the latitude location of any given imagery data product (e.g., at 40°N latitude X = 5.0 m x Y = 5.0 m in cartesian map distance translates to Lon=0.0000586° x Lat=0.0000450° in geographic angular degrees).