The NPOESS Preparatory Project Science Data Segment (SDS) Data Depository and Distribution Element (SD3E) System Architecture

Abstract

The National Polar-orbiting Operational Environmental Satellite System (NPOESS) Preparatory Project (NPP) Science Data Segment (SDS) will make daily data requests for approximately six terabytes of NPP science products for each of its six environmental assessment elements from the operational data providers. As a result, issues associated with duplicate data requests, data transfers of large volumes of diverse products, and data transfer failures raised concerns with respect to the network traffic and bandwidth consumption. The NPP SDS Data Depository and Distribution Element (SD3E) was developed to provide a mechanism for efficient data exchange, alleviate duplicate network traffic, and reduce operational costs.

Evaluation of the VIIRS Land algorithms at Land PEATE

“…Figure 2.1 shows a high level interface of Land PEATE to external NPP mission segments and other elements within the SDS. Land PEATE will receive the IDPS operational algorithm codes from a repository in CasaNOSA, and acquire data records from the SD3E [2] and also from the ADS on ad_hoc basis. SD3E provides temporary local storage for a minimum of 32 days of xDR data and 7 days of Intermediate Products (IPs).…”

“…The Science Data Segment (SDS) [4,5] of the NPP system provides the NPP mission with the capability to assess the quality of the Raw Data Records (RDR) it receives from the IDPS, and the quality of the Sensor Data Records (SDR) and the Environmental Data Records (EDR) it receives from the ADS. The SDS is composed of SDS Data Distribution and Depository Element (SD3E) [2], the Integration and Test System Element (I&TSE), the Project Science Office Element (PSOE), the NPP Instrument Calibration Support Element (NICSE), and five separate PEATEs dedicated to assessing the quality of products from the Land, Ocean, Atmosphere, Ozone, and atmospheric Sounder disciplines. The Land PEATE will fulfill the NPP mission's goal of continuing the evaluation of science products that are main sources of the global change observations that began with the MODIS Land data from the Terra and Aqua satellites.…”