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Version 1.1 Release

· 2 min read
Keaghan Rilling
Product Manager

We're extremely excited to announce our version 1.1 release for Wyvern imagery!

This release contains a number of different improvements, including redefining our naming convention, defining our standard pixel cell size, and considerable improvements to our calibration.

Notes​

  • Updated all folder and file naming convention to align with official Wyvern Product ID defined as:

    wyvern_platform_name_capture_date_time_collection_id_auxiliary_file_type.file_extension, where:

    1. platform_name is one of the satellites in the Dragonette constellation
    2. capture_date_time is acquisition time in UTC format [YYYY][MM][DD]T[hh][mm][ss]
    3. collection_id is the first 8 characters of the image GUID
    4. auxiliary_file_type is auxiliary delivery files such as ‘preview’, ‘thumbnail’, ‘data_mask'
    5. file_extension is common format fileextensions such as ‘.tiff’ or ‘.json’

  • Introduced official product versioning and incremented up to v1.1

  • Improvements to interpolation during geolocation processing steps.

  • The pixel cell size for delivered imagery data products has been updated to preserve 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 Longitude & Latitude 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).

  • Updated the STAC JSON metadata:

    • Added the processing version.
    • Changed the common name for Band_799nm to “nir”.

  • Improved radiance values for all bands, particularly bands 503 nm, 510 nm, 519 nm, 535 nm, 549 nm.

    • Improved bias subtraction and flat fielding.
    • Improved the overall radiometry for band 510 nm.
    • Minor vertical image destriping corrections.