The DRL serves the global Direct Readout community here on behalf of the SNPP mission. As the "Portal" for SNPP Direct Readout mission information, technologies and algorithms, the DRL enables the global Direct Readout community to process SNPP Earth monitoring data for real-time applications.
For the purposes of technology evaluation and user awareness, the DRL receives the SNPP High Rate Data (HRD) transmission using the representative SNPP Direct Readout system and generates SNPP products for each pass observed. The products are then published to the Recent Data Products gallery on the DRL Web Portal. The algorithms used to generate these products were provided by the mission and ported by the DRL and other mission development teams. The DRL implemented these algorithms in support of the SNPP instrument suite for use in a Direct Readout environment. These SNPP algorithms, in Science Processing Algorithm (SPA) form, are available for free download via the DRL Web Portal. The IPOPP data processing framework is also available for free download via the DRL Web Portal.
SNPP Direct Readout Technologies, Data and Services
- Technologies
Software and Algorithms to process SNPP data
- Recent SNPP Data Products
SNPP data products generated with IPOPP technologies
- Latest VIIRS Image
Quicklook Images from VIIRS Instrument Instrument created with Simulcast
- SNPP Data
Archive of VIIRS, ATMS, CrIS and OMPS Instrument data
- Latest Ephemeris
Latest NPP Two-Line Element (TLE) File
To learn more about DRL's phased approach to NPP algorithm implementation click here.
The DRL completed Phase 1 of its NPP algorithm implementation by porting available Suomi NPP processing algorithms for use in a Direct Readout environment. With Phase 2, the DRL addressed science implementation issues and support of the mission-specified data format. Now in Phase 3 the DRL is addressing a maintenance model, with the focus on creating an efficient approach for versioning the baseline algorithms within a Direct Readout environment. Phase 3 implementation progress is captured in the diagram "Phase 3 Direct Readout Implementation of the VIIRS IDPS Chained-processing Approach." The diagram is available as either a PDF or a PowerPoint file.
Previous versions of this diagram are available in either PDF or PowerPoint files:
The "VIIRS IDPS Chained-processing Approach" diagram is available as either a PDF or PowerPoint file.
To learn more about pre-launch Suomi NPP High Rate Data Testing with DRL Technologies click here.
Sample tested raw High Rate Data (HRD), test reports, and statistical analysis were provided to the DRL by the NASA NPP System Integration and Test (SI&T) Team as part of the NPP Compatibility Test (NCT) 3, Part I. The DRL applied this material against its own software development requirements to ensure that NISGS technologies will enable the HRD community to create NPP data products.
The DRL processed the sample data with its Real-time Software Telemetry Processing System (RT-STPS) (Version 5.0, the NPP release). The RT-STPS Viewer was used to verify that resulting packet counts matched expected packet count values provided to the DRL for comparison. Packet-filtered VIIRS data were sent from RT-STPS to Simulcast to render a corresponding image. ATMS, CrIS, and VIIRS Raw Data Records (RDRs) were generated with RT-STPS and analyzed with the HDF Viewer to verify that file content conforms to specifications contained in the following documents:
Information to identify, distinguish and extract all of the X-band unique source packets from the satellite's mission data streams is contained in the National Polar-Orbiting Operational Environmental Satellite System (NPOESS) Preparatory Project (NPP) Mission Data Format Control Book (MDFCB).
It is assumed that the sample data conform to structural specifications contained in the JPSS Common Data Format Control Book – External Volume VII – Part I – JPSS Downlink Data Formats.
Click here for a sample raw data file and expected packet counts for testing with your own processing configuration.
Click here for the DRL SNPP HRD Commissioning Report (December 2011).
Suomi NPP Mission Documentation
Click
here for the complete listing of JPSS science documents.
