Yongming Ma , Xiaobin Guan , Yuchen Wang , Yuyu Li , Dekun Lin , Huanfeng Shen
{"title":"结合太阳诱导叶绿素荧光和涡动相关方差数据的迁移学习估计GPP","authors":"Yongming Ma , Xiaobin Guan , Yuchen Wang , Yuyu Li , Dekun Lin , Huanfeng Shen","doi":"10.1016/j.jag.2025.104503","DOIUrl":null,"url":null,"abstract":"<div><div>Gross primary productivity (GPP) plays a crucial role in the carbon exchange between the atmosphere and terrestrial ecosystems. Eddy covariance (EC) method can obtain accurate GPP at the site level, but the sparse distribution limits representativeness. Satellite solar-induced chlorophyll fluorescence (SIF) serves as emerging data of large-scale GPP, yet there are still limitations in its conversion to GPP and spatiotemporal coverage. This study proposes a transfer learning (SIFEC-TL) method to estimate long-term global GPP with high accuracy by combining constraints from SIF and EC data. SIF data are taken as the source domain that provides the spatial information for pre-training, and EC GPP in the target domain provides precise GPP for the machine learning model fine-tuning. To verify the performance of SIFEC-TL, the results are compared with those from machine learning models that use only SIF or EC GPP alone (SIFML and ECML). The results indicate that the SIFEC-TL model demonstrates stronger spatial scalability compared to the SIFML and ECML models, with R<sup>2</sup> increasing by 0.132 and 0.036. The SIFEC-TL more effectively captures inter-annual GPP dynamics with underestimation/overestimation over high/low values in the SIFML and ECML models being well corrected. Furthermore, three different SIF-based GPP are also used as source domains, and the results showed that they only affect pre-training but the final accuracy after fine-tuning remains similar, which indicates SIFEC-TL can obtain stable GPP estimation accuracy regardless of the spatiotemporal coverage of SIF data and its conversion to GPP.</div></div>","PeriodicalId":73423,"journal":{"name":"International journal of applied earth observation and geoinformation : ITC journal","volume":"139 ","pages":"Article 104503"},"PeriodicalIF":7.6000,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"GPP estimation by transfer learning with combined solar-induced chlorophyll fluorescence and eddy covariance data\",\"authors\":\"Yongming Ma , Xiaobin Guan , Yuchen Wang , Yuyu Li , Dekun Lin , Huanfeng Shen\",\"doi\":\"10.1016/j.jag.2025.104503\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Gross primary productivity (GPP) plays a crucial role in the carbon exchange between the atmosphere and terrestrial ecosystems. Eddy covariance (EC) method can obtain accurate GPP at the site level, but the sparse distribution limits representativeness. Satellite solar-induced chlorophyll fluorescence (SIF) serves as emerging data of large-scale GPP, yet there are still limitations in its conversion to GPP and spatiotemporal coverage. This study proposes a transfer learning (SIFEC-TL) method to estimate long-term global GPP with high accuracy by combining constraints from SIF and EC data. SIF data are taken as the source domain that provides the spatial information for pre-training, and EC GPP in the target domain provides precise GPP for the machine learning model fine-tuning. To verify the performance of SIFEC-TL, the results are compared with those from machine learning models that use only SIF or EC GPP alone (SIFML and ECML). The results indicate that the SIFEC-TL model demonstrates stronger spatial scalability compared to the SIFML and ECML models, with R<sup>2</sup> increasing by 0.132 and 0.036. The SIFEC-TL more effectively captures inter-annual GPP dynamics with underestimation/overestimation over high/low values in the SIFML and ECML models being well corrected. Furthermore, three different SIF-based GPP are also used as source domains, and the results showed that they only affect pre-training but the final accuracy after fine-tuning remains similar, which indicates SIFEC-TL can obtain stable GPP estimation accuracy regardless of the spatiotemporal coverage of SIF data and its conversion to GPP.</div></div>\",\"PeriodicalId\":73423,\"journal\":{\"name\":\"International journal of applied earth observation and geoinformation : ITC journal\",\"volume\":\"139 \",\"pages\":\"Article 104503\"},\"PeriodicalIF\":7.6000,\"publicationDate\":\"2025-04-13\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International journal of applied earth observation and geoinformation : ITC journal\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1569843225001505\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"REMOTE SENSING\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International journal of applied earth observation and geoinformation : ITC journal","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1569843225001505","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"REMOTE SENSING","Score":null,"Total":0}
GPP estimation by transfer learning with combined solar-induced chlorophyll fluorescence and eddy covariance data
Gross primary productivity (GPP) plays a crucial role in the carbon exchange between the atmosphere and terrestrial ecosystems. Eddy covariance (EC) method can obtain accurate GPP at the site level, but the sparse distribution limits representativeness. Satellite solar-induced chlorophyll fluorescence (SIF) serves as emerging data of large-scale GPP, yet there are still limitations in its conversion to GPP and spatiotemporal coverage. This study proposes a transfer learning (SIFEC-TL) method to estimate long-term global GPP with high accuracy by combining constraints from SIF and EC data. SIF data are taken as the source domain that provides the spatial information for pre-training, and EC GPP in the target domain provides precise GPP for the machine learning model fine-tuning. To verify the performance of SIFEC-TL, the results are compared with those from machine learning models that use only SIF or EC GPP alone (SIFML and ECML). The results indicate that the SIFEC-TL model demonstrates stronger spatial scalability compared to the SIFML and ECML models, with R2 increasing by 0.132 and 0.036. The SIFEC-TL more effectively captures inter-annual GPP dynamics with underestimation/overestimation over high/low values in the SIFML and ECML models being well corrected. Furthermore, three different SIF-based GPP are also used as source domains, and the results showed that they only affect pre-training but the final accuracy after fine-tuning remains similar, which indicates SIFEC-TL can obtain stable GPP estimation accuracy regardless of the spatiotemporal coverage of SIF data and its conversion to GPP.
期刊介绍:
The International Journal of Applied Earth Observation and Geoinformation publishes original papers that utilize earth observation data for natural resource and environmental inventory and management. These data primarily originate from remote sensing platforms, including satellites and aircraft, supplemented by surface and subsurface measurements. Addressing natural resources such as forests, agricultural land, soils, and water, as well as environmental concerns like biodiversity, land degradation, and hazards, the journal explores conceptual and data-driven approaches. It covers geoinformation themes like capturing, databasing, visualization, interpretation, data quality, and spatial uncertainty.