Abstract

The Advanced Technology Microwave Sounder (ATMS) was placed in polar orbit aboard the Suomi NPOESS Preparatory Project (NPP) satellite on 28 October 2011. As part of the ATMS calibration/validation effort, geolocation pointing analyses are used to determine the pointing tolerance of the ATMS field of regard and to verify compliance with the values outlined in ATMS Science Data Record (SDR) Validation Operations Concepts Document (OPSCON). SDL is using a coastline crossing method (CCM) and a land-sea fraction method (LFM), to compare with the Global Self-consistent, Hierarchical, High-resolution Shoreline (GSHHS) database, to quantify the ATMS geolocation accuracy. The ATMS measurements provide pairs of latitude and longitude data for a given band that are fed into the CCM and LFM. The CCM is based on the inflection points of the ATMS window channel brightness temperature measurements across the coastlines, and the LFM correlates the ATMS scene data with a synthetic scene generated from GSHHS. The ATMS window channel geolocation errors estimated from CCM and LFM are consistent in magnitude for most of the channels. This presentation will briefly discuss the ATMS payload in relation to the geolocation calibration, describe the algorithms used to derive geolocation registration, present results trended throughout the mission to date, and summarize the uncertainty estimates for these measurements.

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Aug 25th, 10:15 AM

Geolocation Derivation, Trending, and Accuracy of Suomi NPP Advanced Technology Microwave Sounder Measurements

The Advanced Technology Microwave Sounder (ATMS) was placed in polar orbit aboard the Suomi NPOESS Preparatory Project (NPP) satellite on 28 October 2011. As part of the ATMS calibration/validation effort, geolocation pointing analyses are used to determine the pointing tolerance of the ATMS field of regard and to verify compliance with the values outlined in ATMS Science Data Record (SDR) Validation Operations Concepts Document (OPSCON). SDL is using a coastline crossing method (CCM) and a land-sea fraction method (LFM), to compare with the Global Self-consistent, Hierarchical, High-resolution Shoreline (GSHHS) database, to quantify the ATMS geolocation accuracy. The ATMS measurements provide pairs of latitude and longitude data for a given band that are fed into the CCM and LFM. The CCM is based on the inflection points of the ATMS window channel brightness temperature measurements across the coastlines, and the LFM correlates the ATMS scene data with a synthetic scene generated from GSHHS. The ATMS window channel geolocation errors estimated from CCM and LFM are consistent in magnitude for most of the channels. This presentation will briefly discuss the ATMS payload in relation to the geolocation calibration, describe the algorithms used to derive geolocation registration, present results trended throughout the mission to date, and summarize the uncertainty estimates for these measurements.