{"id":21,"date":"2016-06-02T23:14:57","date_gmt":"2016-06-02T23:14:57","guid":{"rendered":"https:\/\/moby.mlml.calstate.edu\/?page_id=21"},"modified":"2017-05-11T09:42:21","modified_gmt":"2017-05-11T16:42:21","slug":"why-moby-measures-color","status":"publish","type":"page","link":"https:\/\/mlml.sjsu.edu\/moby\/why-moby-measures-color\/","title":{"rendered":"About"},"content":{"rendered":"

Why MOBY measures color<\/h3>\n

\"MOBYThe Marine Optical Buoy (MOBY), a radiometric buoy stationed in the waters off Lanai, Hawaii, is the primary ocean observatory for vicarious calibration of satellite ocean color sensors. MOBY measures light\u00a0 near the sea surface (1, 5 and 9 meters) off Lanai from July 1997 to the present (over 10 years).\u00a0 The fundamental satellite measurement on which all ocean color products are derived is the water-leaving spectral radiance, Lwn.\u00a0\u00a0 Water-leaving radiance from the ocean contributes only 10% (at most) of the radiance measured by a satellite sensor above the atmosphere (Gordon 1997), a 5% uncertainty in Lwn implies a 0.5% uncertainty in the above-atmosphere radiance measurements.\u00a0 This level of uncertainty can only be approached using \u201cvicarious-calibration\u201d methods. In practice, this means that the satellite radiance responsivity is adjusted to minimize the differences between an ensemble of satellite and in situ<\/em> Lwn data matchups. Since late 1996, MOBY has been the primary basis for the on-orbit vicarious calibrations of all three US ocean color sensors and numerous international satellite sensors. The MOBY vicarious calibration of these sensors supports the international effort to develop a global, multi-year time series of consistently calibrated ocean color data products. \u00a0Without MOBY’s vicarious calibration efforts, SeaWiFS derived values for Lwn would have been in error by 25% at 490nm and 75% at 412 nm [Franz et al. Applied Optics Vol. 46, No. 22, page 5068 – 5082 (2007)]<\/p>\n","protected":false},"excerpt":{"rendered":"

Why MOBY measures color The Marine Optical Buoy (MOBY), a radiometric buoy stationed in the waters off Lanai, Hawaii, is the primary ocean observatory for vicarious calibration of satellite ocean color sensors. MOBY measures light\u00a0 near the sea surface (1, 5 and 9 meters) off Lanai from July 1997 to the present (over 10 years).\u00a0 […]<\/p>\n","protected":false},"author":13,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-21","page","type-page","status-publish","hentry"],"distributor_meta":false,"distributor_terms":false,"distributor_media":false,"distributor_original_site_name":"Marine Optical BuoY (MOBY)","distributor_original_site_url":"https:\/\/mlml.sjsu.edu\/moby","push-errors":false,"_links":{"self":[{"href":"https:\/\/mlml.sjsu.edu\/moby\/wp-json\/wp\/v2\/pages\/21","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mlml.sjsu.edu\/moby\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/mlml.sjsu.edu\/moby\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/mlml.sjsu.edu\/moby\/wp-json\/wp\/v2\/users\/13"}],"replies":[{"embeddable":true,"href":"https:\/\/mlml.sjsu.edu\/moby\/wp-json\/wp\/v2\/comments?post=21"}],"version-history":[{"count":2,"href":"https:\/\/mlml.sjsu.edu\/moby\/wp-json\/wp\/v2\/pages\/21\/revisions"}],"predecessor-version":[{"id":663,"href":"https:\/\/mlml.sjsu.edu\/moby\/wp-json\/wp\/v2\/pages\/21\/revisions\/663"}],"wp:attachment":[{"href":"https:\/\/mlml.sjsu.edu\/moby\/wp-json\/wp\/v2\/media?parent=21"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mlml.sjsu.edu\/moby\/wp-json\/wp\/v2\/categories?post=21"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mlml.sjsu.edu\/moby\/wp-json\/wp\/v2\/tags?post=21"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}