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We evaluated whether Landsat 8 can successfully map the start of growing season (SOS) at 78\u00b0N in Svalbard by developing spectral-based cloud detection algorithms tailored to Arctic conditions. From 17 images during the 2014 growing season, we generated cloud-free NDVI time series and extracted SOS dates at 30-m resolution across Adventdalen (Advent Valley). Validation against six field plots equipped with phenocameras demonstrated strong agreement (R\u00b2 = 0.884, RMSE\u2009=\u20094.1 days, NSE\u2009=\u20090.869). The resulting SOS map revealed systematic spatial patterns ranging from late May to early August, with elevation explaining 6.6% of variance as the strongest single predictor. Combined topographic models (elevation, slope, distance from sea) explained 14.6% of variance, indicating that unmeasured factors particularly aspect, snow distribution, and vegetation composition exert dominant controls on phenological timing. These results confirm the viability of Landsat-based phenology mapping in the high Arctic. Critically, by establishing a validated processing framework this study provides the methodological foundation for application to the historical Landsat archive (Landsat 4\/5 TM and Landsat 7 ETM+), subject to cross-sensor radiometric calibration. This opens unprecedented opportunities for reconstructing 30-m resolution phenological time series extending back to 1984, enabling quantification of four decades of vegetation responses to Arctic warming in regions experiencing some of Earth\u2019s most rapid climate change.<\/jats:p>","DOI":"10.1007\/s00484-026-03276-4","type":"journal-article","created":{"date-parts":[[2026,7,22]],"date-time":"2026-07-22T13:28:05Z","timestamp":1784726885000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Can time-series of Landsat data be used to map the onset of growth at 78\u00b0N (central Svalbard)?"],"prefix":"10.1007","volume":"70","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9802-8962","authenticated-orcid":false,"given":"Laura","family":"Stendardi","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8130-0253","authenticated-orcid":false,"given":"Giovanni","family":"Argenti","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6207-5188","authenticated-orcid":false,"given":"Luigi","family":"Ranghetti","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9456-6990","authenticated-orcid":false,"given":"Stein Rune","family":"Karlsen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,7,22]]},"reference":[{"issue":"4","key":"3276_CR1","doi-asserted-by":"publisher","first-page":"437","DOI":"10.1111\/j.1600-0587.2000.tb00300.x","volume":"23","author":"R Aanes","year":"2000","unstructured":"Aanes R, Saether B-E, \u00d8ritsland NA (2000) Fluctuations of an introduced population of Svalbard Reindeer: the effects of density dependence and climatic variation. 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