Geographic Information System (GIS) technology is applied to perform Data Quality (DQ) Monitoring functions in support of the NPOESS/NPP Ground Processing System. A GIS-based design provides broad capabilities "out of the box" for remote sensor and ancillary data ingest and management, with flexible data display, processing and interactive editing in a spatial/relational environment, and can be quickly adapted to changes in remote sensor operations. GIS-based utilities for the analysis of remote sensing information have been prototyped using NASA Earth Observing System (EOS) and supplemental information from ground-based and airborne in-situ platforms. The Data Quality Monitoring capability provides a quick look at data and analysis products within the operational weather product generation environment, and can support System Test & Evaluation (ST&E) by filtering and preprocessing the NPOESS/NPP products for off-line Calibration and Validation (Cal/Val) analysis. GIS processing speed is optimized in an operational environment through declaration of a sensor space projection that minimizes coordinate transformations for data layer collocation.