This study compares MODIS NDVI 16-day (250 m) time series, acquired by Terra and Aqua platforms, for monitoring the phenological cycle of larch and grasslands in an alpine environment. The accuracy of MODIS 250 m Terra and Aqua phenological metrics �as evaluated for larch forests through comparison �ith field data. At regional level it �as carried out a correlation analysis bet�een the mean dates of start and end of season detected from MODIS Terra and Aqua in different years. Regional maps of start and end of season �ere derived from MODIS data and the interannual phenological variability of both ecosystems �as evaluated. Annual anomalies of the beginning of the gro�ing season, obtained from satellite data, �ere related �ith air temperature anomalies, computed from meteorological stations, to evaluate the effects of recent climate variability on the vegetation phenological cycle. Comparison �ith field phenological observations sho�ed that the start and the end of phenological cycle can be accurately determined from MODIS Terra and Aqua data and that an increase/decrease of 1°C in spring temperature lead to about 10 days in advance/ delay of the start of the gro�ing season.
本研究比较了Terra和Aqua平台获取的MODIS NDVI 16天(250 m)时间序列，用于监测高山环境下落叶松和草地的物候周期。MODIS 250 m Terra和Aqua物候指标的准确性通过与野外数据的比较进行评估。在区域一级，对MODIS Terra和Aqua在不同年份探测到的季节开始和结束的平均日期进行了相关分析。季节开始和结束的区域图是根据MODIS数据和经评估的两个生态系统的年际物候变异性得出的。从卫星数据获得的生长季节开始的年度异常与气象站计算的气温异常相关联，以评估近期气候变率对植被物候周期的影响。与野外物候观测结果的比较表明，MODIS Terra和Aqua资料可以准确地确定物候周期的开始和结束时间，春季气温每升高/降低1℃，生长季开始时间就会提前/延迟10 d左右。
{"title":"Phenological monitoring of grassland and larch in the Alps from Terra and Aqua MODIS images","authors":"R. Colombo, L. Busetto, F. Fava, B. D. Mauro, M. Migliavacca, E. Cremonese, M. Galvagno, M. Rossini, M. Meroni, S. Cogliati, C. Panigada, C. Siniscalco, U. M. D. Cella","doi":"10.5721/ITJRS20114336","DOIUrl":"https://doi.org/10.5721/ITJRS20114336","url":null,"abstract":"This study compares MODIS NDVI 16-day (250 m) time series, acquired by Terra and Aqua platforms, for monitoring the phenological cycle of larch and grasslands in an alpine environment. The accuracy of MODIS 250 m Terra and Aqua phenological metrics �as evaluated for larch forests through comparison �ith field data. At regional level it �as carried out a correlation analysis bet�een the mean dates of start and end of season detected from MODIS Terra and Aqua in different years. Regional maps of start and end of season �ere derived from MODIS data and the interannual phenological variability of both ecosystems �as evaluated. Annual anomalies of the beginning of the gro�ing season, obtained from satellite data, �ere related �ith air temperature anomalies, computed from meteorological stations, to evaluate the effects of recent climate variability on the vegetation phenological cycle. Comparison �ith field phenological observations sho�ed that the start and the end of phenological cycle can be accurately determined from MODIS Terra and Aqua data and that an increase/decrease of 1°C in spring temperature lead to about 10 days in advance/ delay of the start of the gro�ing season.","PeriodicalId":56270,"journal":{"name":"Rivista Italiana Di Telerilevamento","volume":"29 1","pages":"83-96"},"PeriodicalIF":0.0,"publicationDate":"2011-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79213668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this st��y we analye the spatial antemporal variability of Eropean Larch phenological cycle in montainos areas (Val ���osta, Italy) bysing a combination of satelliteata, primary topographic attribtes (altit��e anaspect) anphenological moelsriven by climatic variables. We apply a remote sensing techniqe baseon a time series of MODIS �ERR� 250m 16-�ays NDVIata for mapping the inter-annal variability of phenological cycle. Starting from the satellite green-�p maps we spatially explorethe response of larch phenology atifferent terrain conitions varying for altit��e anaspect. � retrospective analysis baseon climate-�riven phenological moels was finally con��cteto evalate the magnit��e of temporal variability of Larch phenology in the last centry.
{"title":"On the spatial and temporal variability of Larch phenological cycle in mountainous areas","authors":"R. Colombo, L. Busetto, M. Migliavacca, E. Cremonese, M. Meroni, M. Galvagno, M. Rossini, C. Siniscalco, U. M. D. Cella","doi":"10.5721/ITJRS20094126","DOIUrl":"https://doi.org/10.5721/ITJRS20094126","url":null,"abstract":"In this st��y we analye the spatial antemporal variability of Eropean Larch phenological cycle in montainos areas (Val ���osta, Italy) bysing a combination of satelliteata, primary topographic attribtes (altit��e anaspect) anphenological moelsriven by climatic variables. We apply a remote sensing techniqe baseon a time series of MODIS �ERR� 250m 16-�ays NDVIata for mapping the inter-annal variability of phenological cycle. Starting from the satellite green-�p maps we spatially explorethe response of larch phenology atifferent terrain conitions varying for altit��e anaspect. � retrospective analysis baseon climate-�riven phenological moels was finally con��cteto evalate the magnit��e of temporal variability of Larch phenology in the last centry.","PeriodicalId":56270,"journal":{"name":"Rivista Italiana Di Telerilevamento","volume":"140 1","pages":"79-96"},"PeriodicalIF":0.0,"publicationDate":"2009-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86648982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A high-resolution echosounder was used to acquire seismo-acoustic records of P. oceanica dead matte patches in the Gulf of Palermo. Seismo-acoustic profiling enabled detection of dead matte structures that are invisible to visual inspection, being hidden by variable layers of sandy sediment. The thickness of the dead matte measured reaches a maximum of 2.2 m. The mean volume of the matte per unit area of seabed surface (MEIx) varies from 0.2 to 2.2 m 3 /m 2 , with an average value of 1.6 m 3 /m 2 and a total volume estimated at 73,000 m 3 . From literature data and from the volume of dead matte calculated in the present work we estimated that total carbon accumulated in the matte is about 2,484 tons. Seismo-acoustic technologies proves to be a powerful, non-destructive method to measure the thickness, extension, volume of dead matte and its potential carbon content.
{"title":"Detection and mapping of Posidonia oceanica dead matte by high-resolution acoustic imaging","authors":"S. Calvo, C. Orestano, A. Scannavino, Filippo Luzzu, M. Pirrotta, A. Tomasello, G. D. Maida","doi":"10.5721/ITJRS200941210","DOIUrl":"https://doi.org/10.5721/ITJRS200941210","url":null,"abstract":"A high-resolution echosounder was used to acquire seismo-acoustic records of P. oceanica dead matte patches in the Gulf of Palermo. Seismo-acoustic profiling enabled detection of dead matte structures that are invisible to visual inspection, being hidden by variable layers of sandy sediment. The thickness of the dead matte measured reaches a maximum of 2.2 m. The mean volume of the matte per unit area of seabed surface (MEIx) varies from 0.2 to 2.2 m 3 /m 2 , with an average value of 1.6 m 3 /m 2 and a total volume estimated at 73,000 m 3 . From literature data and from the volume of dead matte calculated in the present work we estimated that total carbon accumulated in the matte is about 2,484 tons. Seismo-acoustic technologies proves to be a powerful, non-destructive method to measure the thickness, extension, volume of dead matte and its potential carbon content.","PeriodicalId":56270,"journal":{"name":"Rivista Italiana Di Telerilevamento","volume":"70 1","pages":"139-146"},"PeriodicalIF":0.0,"publicationDate":"2009-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85637683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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