Cross-calibration of IRS-P4 OCM satellite sensor

Three decades of ocean-color remote-sensing Trichodesmium spp. in the World’s oceans: A review

“…The Ocean Color Monitor (OCM) was an experimental sensor launched aboard the IRS-P4 satellite by the Indian Space Research Organization (ISRO) in May 1999 (Suresh et al, 2006). The OCM provided a similar spectral band resolution to SeaWiFS (see Table 5), however the OCM differed in sensor design.…”

“…The OCM provided a similar spectral band resolution to SeaWiFS (see Table 5), however the OCM differed in sensor design. The OCM design was that of a pushbroom linear array with 12 bit digitization having a swath width of 1420 km (Parmar et al, 2006;Suresh et al, 2006) whereas SeaWiFS was a whiskbroom-type scanner with a swath width of 2800 km (McClain et al, 1992). The primary advantage of the OCM was its local area coverage (LAC) pixel resolution of 360 m  360 m compared to SeaWiFS LAC pixel resolution of 1 km  1 km (Suresh et al, 2006).…”

“…The OCM design was that of a pushbroom linear array with 12 bit digitization having a swath width of 1420 km (Parmar et al, 2006;Suresh et al, 2006) whereas SeaWiFS was a whiskbroom-type scanner with a swath width of 2800 km (McClain et al, 1992). The primary advantage of the OCM was its local area coverage (LAC) pixel resolution of 360 m  360 m compared to SeaWiFS LAC pixel resolution of 1 km  1 km (Suresh et al, 2006). The OCM therefore could potentially resolve fine-scale spatial features, such as surface aggregations of Trichodesmium that would be of sub-pixel scale for SeaWiFS.…”

Atmospheric Correction and Vicarious Calibration of Oceansat-1 Ocean Color Monitor (OCM) Data in Coastal Case 2 Waters

“…In the absence of any -ground‖ truth such as buoy or other suitable matchup data, an inter-comparison of satellite sensors is often the best choice [23]. As the SeaWiFS instrument was well-calibrated, the SeaWiFS n L w values are the best choice to vicariously calibrate another satellite sensor, particularly when the bands of the sensor to be calibrated (e.g., OCM) are nearly identical to SeaWiFS and the sensor has a similar overpass time as SeaWiFS.…”

“…Amongst all the ocean color sensors, SeaWiFS had the most comprehensive vicarious calibration program in place [20] and it was continuously monitored for calibration errors using several direct methods and well-calibrated instruments such as one at the MOBY site near Hawaii [21][22][23]. As the OCM sensor has nearly identical bands and a similar equatorial crossing time to SeaWiFS, OCM data were vicariously calibrated using SeaWiFS data as reference.…”