Ground control points refresh for MODIS and VIIRS geolocation monitoring

Ping Zhang; Guoqing Lin; Bin Tan; Robert E. Wolfe

doi:10.1117/12.2594323

1 August 2021 Ground control points refresh for MODIS and VIIRS geolocation monitoring

Ping Zhang, Guoqing Lin, Bin Tan, Robert E. Wolfe

Proceedings Volume 11829, Earth Observing Systems XXVI; 118290Y (2021) https://doi.org/10.1117/12.2594323
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

The Control Point Matching(CPM) program and a set of over 1200 globally distributed ground control points (GCPs ) have been successfully used to develop more than 20 years of MODIS geolocation products. In this research, we refresh current GCP library with more than 2500 new GCPs using the latest Landsat 8 Collection 2 images. The refreshed GCPs are distributedfrom56 S to 80 N latitude, with more than 2000 shoreline and 500 inland GCP chips. The size of these GCPs are extended from 800*800 to 1400*1400 Landsat pixels and the CPM program correspondingly increases the searching distance from0.8 pixels to 2.5 pixels, which also extends the geolocation error measurement from+/-45 to the edge of scan at +/-55 degree in scan angle. This will allow the algorithm to catch geolocation errors that are larger than one MODIS pixel. The geolocation errors measured with the refreshed GCP library are comparable to the previous results, yet with 2-3 more times of matched GCPs. The daytime Aqua ascending orbits and Terra descending orbits enable us to identify a few GCP outliers which might be due to the quality of the original Landsat images. Most importantly, the refreshed GCP library will include images from both Landsat band 4 to match with VII RS I1, and Landsat band 6 to match with VIIRS I3. This will allow us to measure and correct on orbit band-to-band registration at both track and scan directions, which will help understanding and improving future JPSS mission’s prelaunch geometric performance.

Conference Presentation

Citation Download Citation

Ping Zhang, Guoqing Lin, Bin Tan, and Robert E. Wolfe "Ground control points refresh for MODIS and VIIRS geolocation monitoring", Proc. SPIE 11829, Earth Observing Systems XXVI, 118290Y (1 August 2021); https://doi.org/10.1117/12.2594323

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