About the Team

About the Website

Level-1 geolocation website for MODIS, VIIRS, and GOES-R ABI and GLM.

Our goal is to facilitate simple storage, delivery, and exploration of IPATS results.

Definitions

MODIS:

Moderate-resolution Imaging Spectroradiometer of Terra (launched 1999) and Aqua (launched 2001). More...

VIIRS:

Visible Infrared Imaging Radiometer Suite of the JPSS satellite, Suomi-NPP (launched October 2011). More...

GOES-R:

US Geostationary Operational Environmental Satellite R-series. GOES-16 (launched November 2017) and GOES-17 (launched March 2018) are currently in operation. More...

ABI:

Advanced Baseline Imager of the GOES-R series. ABI has 16 channels and produces 3 types of data: Full Disk, Continental U.S., and Mesoscale.

GLM:

Geostationary Lightning Mapper of the GOES-R series.

INR:

Image Navigation and Registration.

IPATS:

INR Performace Assessment Tool Set. IPATS was developed to assess the GOES-R ABI and GLM INR performance. Read more in the JARS 2020 paper.

To fully assess the INR accuracy of level-1B ABI images, IPATS produces five types of INR quality assessment metrics:

• Channel-to-channel registration (CCR) error: relative navigation error at corresponding image features of different channels in the same frame. Also known as BBR (band-to-band).
• Frame-to-frame registration (FFR) error: relative navigation error of corresponding image features of same channel in consecutive images.
• Navigation (NAV) error: difference between the location of an image feature and its true location.
• Swath-to-swath registration (SSR) error: relative navigation error of two neighboring image features on opposite sides of the horizontal image swath boundary.
• Within-frame registration (WIFR) error: difference between radial separation of two image features on the fixed grid coordinate system and their true angular separation. WIFR is calculated indirectly from the NAV results.

All 16 of ABI's channels are compared in FFR, every pair is compared in CCR, and only a subset of channels (1-7 and 11-16) are analyzed in NAV. IPATS outputs each metric into three aggregation schemes: no aggregation, scene-based aggregation, and daily aggregation. The Dashboard uses daily aggregated results in its tables and uses the scene-based aggregation for its plots.