{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,9]],"date-time":"2026-07-09T04:15:06Z","timestamp":1783570506506,"version":"3.55.0"},"reference-count":66,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2020,8,17]],"date-time":"2020-08-17T00:00:00Z","timestamp":1597622400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The Ocean and Land Colour Instrument (OLCI) on-board Sentinel-3 (2016\u2013present) was designed with similar mechanical and optical characteristics to the Envisat Medium Resolution Imaging Spectrometer (MERIS) (2002\u20132012) to ensure continuity with a number of land and marine biophysical products. The Sentinel-3 OLCI Terrestrial Chlorophyll Index (OTCI) is an indicator of canopy chlorophyll content and is intended to continue the legacy of the Envisat MERIS Terrestrial Chlorophyll Index (MTCI). Despite spectral similarities, validation and verification of consistency is essential to inform the user community about the product\u2019s accuracy, uncertainty, and fitness for purpose. This paper aims to: (i) describe the theoretical basis of the Sentinel-3 OTCI and (ii) evaluate the spatiotemporal consistency between the Sentinel-3 OTCI and the Envisat MTCI. Two approaches were used to conduct the evaluation. Firstly, agreement between the Sentinel-3 OTCI and the Envisat MTCI archive was assessed over the Committee for Earth Observation Satellites (CEOS) Land Product Validation (LPV) core validation sites, enabling the temporal consistency of the two products to be investigated. Secondly, intercomparison of monthly Level-3 Sentinel-3 OTCI and Envisat MTCI composites was carried out to evaluate the spatial distribution of differences across the globe. In both cases, the agreement was quantified with statistical metrics (R2, NRMSD, bias) using an Envisat MTCI climatology based on the MERIS archive as the reference. Our results demonstrate strong agreement between the products. Specifically, high 1:1 correspondence (R2 &gt;0.88), low global mean percentage difference (\u22121.86 to 0.61), low absolute bias (&lt;0.1), and minimal error (NRMSD ~0.1) are observed. The temporal profiles reveal consistency in the expected range of values, amplitudes, and seasonal trajectories. Biases and discrepancies may be attributed to changes in land management practices, land cover change, and extreme climatic events occurred during the time gap between the missions; however, this requires further investigation. This research confirms that Sentinel-3 OTCI dataset can be used along with the Envisat MTCI to provide a data coverage over the last 20 years.<\/jats:p>","DOI":"10.3390\/rs12162652","type":"journal-article","created":{"date-parts":[[2020,8,17]],"date-time":"2020-08-17T21:58:53Z","timestamp":1597701533000},"page":"2652","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["The Sentinel-3 OLCI Terrestrial Chlorophyll Index (OTCI): Algorithm Improvements, Spatiotemporal Consistency and Continuity with the MERIS Archive"],"prefix":"10.3390","volume":"12","author":[{"given":"J.","family":"Pastor-Guzman","sequence":"first","affiliation":[{"name":"University of Southampton, Hartley Library B12, University Rd, Highfield, Southampton SO17 1BJ, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4807-9056","authenticated-orcid":false,"given":"L.","family":"Brown","sequence":"additional","affiliation":[{"name":"University of Southampton, Hartley Library B12, University Rd, Highfield, Southampton SO17 1BJ, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H.","family":"Morris","sequence":"additional","affiliation":[{"name":"University of Southampton, Hartley Library B12, University Rd, Highfield, Southampton SO17 1BJ, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"L.","family":"Bourg","sequence":"additional","affiliation":[{"name":"ACRI-ST, 260 Route du Pin Montard, 06904 Sophia-Antipolis, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"P.","family":"Goryl","sequence":"additional","affiliation":[{"name":"European Space Agency (ESA), Largo Galileo Galilei, 1, 00044 Frascati RM, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S.","family":"Dransfeld","sequence":"additional","affiliation":[{"name":"European Space Agency (ESA), Largo Galileo Galilei, 1, 00044 Frascati RM, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J.","family":"Dash","sequence":"additional","affiliation":[{"name":"University of Southampton, Hartley Library B12, University Rd, Highfield, Southampton SO17 1BJ, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2020,8,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"101","DOI":"10.1016\/j.jplph.2016.05.019","article-title":"Efficiency of chlorophyll in gross primary productivity: A proof of concept and application in crops","volume":"201","author":"Gitelson","year":"2016","journal-title":"J. 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