Catalyst automates workflow for the South African National Space Agency to convert SPOT archive to analysis ready data

Information from Catalyst

Catalyst, a PCI Geomatics brand, has delivered an automated workflow for the South African National Space Agency’s (SANSA) Earth Observation programme to convert decades of SPOT satellite imagery to CARD4L analysis ready data (ARD). The scalable workflow enables SANSA to prepare its entire SPOT archive for immediate analysis using the Open Data Cube, machine learning, and AI models.

The company’s ARD workflow automatically converts optical satellite imagery into ARD measurements by performing a series of image pre-processing operations. The output product is a geometrically precise image with nbar surface reflectance measurements based on the rigor and specifications of CARD4L.

SANSA is the government agency responsible for South Africa’s space programs and research. Its Earth Observation programme collects, processes, archives, and disseminates satellite imagery to support policy and decision making. The agency plans to make its ARD SPOT imagery, dating back to the early 90s, available to all South African government agencies using the Open Data Cube geospatial data management and analysis platform.

ARD eliminates the time and complexities of preparing satellite imagery for analysis, making it more accessible and easier to use. Furthermore, analytical outputs will be more accurate because the ARD process produces geometrically and radiometrically consistent data sets – even if they were collected with different sensors at varying spatial resolutions.

By converting their SPOT archive into CARD4L compliant ARD imagery, SANSA is producing a new commodity that meets the quality and data packaging standards set by the international Committee on Earth Observation Satellites (CEOS). This ensures interoperability among CARD4L image products and a long useful life.

Catalyst offers the ARD Workflow within its Enterprise and Microservices for public and commercial satellite optical sensors.