The Annex of the PDS Cartography & Imaging Sciences Node

Science Center Objects

The Annex of the PDS Cartography and Imaging Sciences Node (aka “Imaging” or IMG) is a data repository designed to support the public delivery of NASA-funded geospatial data products derived from PDS image data. Examples of geospatial, derived products supported include global mosaics and thematic maps of moons and planets, local and regional mineral maps, topography and their derived products like shaded relief and slope maps, and feature (e.g., boulders, craters) catalogs. Many of these products have been developed as a result of NASA data analysis programs, often years after active missions (and their accumulating archives) have ended. 

As of January 2017, the Annex is considered PDS-Equivalent by NASA as a long-term data repository.  Any new products accepted after this time will be archived in the PDS in PDS4-compliant formats by working with IMG node members, and these are supported by at USGS by development of public Annex product pages.  Product pages for closely related products may be gathered on a single site.  All products are required to 1) have been derived from data in the PDS archive, 2) be delivered with extensive metadata that meet PDS archive documentation standards, and 3) be reviewed by PDS for PDS4 compliance and by science peers for validity and usability. Annex product pages may include links to associated files such as related data archival products in the PDS and the original GIS databases, shapefiles, point clouds, etc. used to create the archival products.  

The PDS archive status (marked at upper right of each product page, see table) of geospatial data products in the Annex varies, depending on the source and date of delivery to the Annex. Most products are either PDS3 or PDS4 compliant, with the majority served as 8- or 16-bit “raw” GeoTIFFs (meaning uncompressed and untiled, see White Paper below) with detached PDS3 and ISIS3 headers. In this format, these files are fully PDS4 compliant 2D or 3D “arrays” (see Section 4.2.1 for a summary of PDS4-compliant data formats: https://pds.nasa.gov/datastandards/documents/dph/v1/PDS4_DataProvidersHa...).

Browse images in the Annex are typically served as JPEG (.jpg, a PDS4 "encoded byte stream"). While the collection of fully PDS4 compliant products in the Annex is growing, IMG is working to develop PDS4 archive bundle and collection structures, XML labels and documentation (usually in PDF/A format) for all Annex data.

Regarding data products derived from Geographic Information Systems (GIS) software, note that data formats and structures that are proprietary (e.g., ArcMap geodatabases, shapefiles) are not PDS4 compliant.  However, geodatabase components can typically be archived in PDS in PDS4-compliant formats as tables, 2- or 3-D binary image arrays, etc. For archiving GIS vector data (e.g., shapefiles), IMG developed (see white paper below) use of a particular GeoCSV format (see presentation here; Gaddis and Hare, 2019) for archiving GIS shapefiles in a PDS4-compliant format. This format was approved by the PDS Management Council in August 2018. 

 

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