Abstract
One of the biggest changes in the world of optical remote sensing over the last several years is the sheer increase in the number of sensors that are imaging the Earth in moderate to high spatial resolution. With respect to the calibration of these sensors, they are broadly classified into two types, namely government systems and commercial systems. Because of the differences in the design and mission of these sensor types, calibration approaches are often substantially different. Thus, an opportunity exists to foster discussion between calibration teams for these sensors with the goal of improving overall sensor calibration and data interoperability. The approach used to accomplish this task was a one-day workshop where team members from both government and commercial sensors could share best practices, discuss methods for collaboration and improvement, and make recommendations for continuing activities. Five major recommendations were developed from the event that focused on coordinated activities using pseudo invariant calibration sites (PICS), broader and more consistent communication, collaboration on specific cross-calibration opportunities, developing a reference sensor for all optical systems, and encouraging the coordinated development of surface reflectance products. Workshop participants concluded that regular interactions between these teams could foster a better calibration of all sensor systems and accelerate the improved interoperability of surface products.
Highlights
One of the biggest changes in the world of optical remote sensing over the last several years has been the sheer increase in the number of sensors that are imaging the Earth in moderate to high resolution. These systems are categorized in several ways, but one major distinction is to classify them as large government systems as opposed to smaller commercial systems
Government systems often include major onboard calibration capability that can be costly to develop, while commercial systems often resort to vicarious calibration methods as a cost savings approach
To reduce the need for continuous calibration updating, the Copernicus Sentinel 2 program developed a new approach for absolute geometric calibration called the global reference image (GRI)
Summary
One of the biggest changes in the world of optical remote sensing over the last several years has been the sheer increase in the number of sensors that are imaging the Earth in moderate to high resolution These systems are categorized in several ways, but one major distinction is to classify them as large government systems as opposed to smaller commercial systems. As a result, this increased number of sensors from both types of systems provides the community with a tremendous opportunity to combine data sets. Panelists represented three separate aspects of the question under discussion, namely government satellite calibration, commercial satellite calibration, and independent calibration and applications specialists. VViiccaarriioouuss ccaalliibbrraattiioonnisisalsaolsroegruelgaurllyarpleyrfporemrfoedrmpeodst-plaousnt-clhauunscinhg uasvinargietay ovfarsioeutyrceosfinscolurdciensg ibnocltuhdteinrrgebstortihaltaenrrdeslutrnialratanrdgelutsn.aTrhtaesregemtse.tThhoedsoelomgeietsh,owdhoilloegnieost, awshaiclceunroateaos racpcruecriastee aosrpprree-claisuenacsh parned-laounnbcoharadndcaolinbbraotairodncmaleibthroatdios,nnmeveethrtohdesle, snsepvreortvhideleesasnpinrodveipdeenadnenintdaespsesnsdmeennt taossfetshsemceanlitboraf tihoen coaflitbhreatinonstroufmtheenitns.strAusmaenntesx. aAms palne eoxfawmhpalet oisf pwohsastibislepuosisnibgleviucsairnigouvsicmareiothuosdms,eFthigoudrse, F4igsuhroew4s svhiocawrsiovuiscacrailoibursactaiolinbroaftiLoannodfsLata8ndthsaertm tahleinrmfrarleindfrsacarendnesrca(nTnIReSr )(TuIsRinSg) ubsuionygsb, uwohyisc,hwmheicahsumreawsuatreer wteamtepretreamtupreer.aFtuigrue.reFi4gsuhroew4ssthhoawt rsetshualtsrfersoumltstwfromteatmwos, tReoamchse,sRteorcIhnessttieturtIenostfiTtuetcehnofolToegcyhnanodlotghye aNndAStAheJetNPAroSpAulsJeiotnPLraobpourlastioorny, nLoatbonralytoargyr,eenowtelol,nblyut asgpraenea wbreolal,dbruant gsepoafnraadiabnrcoea/dtemrapnegraetuorfe rvaadliuaensc.eU/tenmceprtearianttuieres avsaslouceisa.teUdnwceitrhtatihnitsiems eatshsoodcioaftecdaliwbritahtiothnisarme oetnhtohde ofrdcearliobfra0t.5ioKn. are on the order of 0.5K
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