文章基本信息

标题：OBIA4RTM – towards an operational open-source solution for coupling object-based image analysis with radiative transfer modelling
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作者：Lukas Graf ; Levente Papp ; Stefan Lang 等
期刊名称：European Journal of Remote Sensing
电子版ISSN：2279-7254
出版年度：2021
卷号：54
期号：sup1
页码：59-70
DOI：10.1080/22797254.2020.1810132
摘要：Radiative transfer models (RTM) provide universally applicable, highly accurate prospects for plant parameter retrieval. Due to the ill-posed nature of radiative transfer theory, however, the retrieval of plant parameters requires sophisticated strategies for model inversion. We argue that object-based image analysis (OBIA) works as an effective regularization measure to cope with this ill-posedness. Despite similar findings reported in the literature, OBIA and RTM are rarely used in a combined manner. Additionally, there is a clear lack of software solutions ready for operational usage. Therefore, we propose OBIA4RTM as an approach to combine OBIA and RTM using Python and PostgreSQL/PostGIS spatial databases in a fully Open Geospatial Consortium (OGC) compliant way. First results obtained in agricultural regions in southern Germany and Austria using Sentinel-2 data during the 2017 and 2018 growing season show root mean squared errors (RMSE) in the leaf area index (LAI) of 1.47 m²/m² in the case of silage maize and 1.31 m²/m² in the case of winter cereals. Issues of integrating space and time as well as defining appropriate validation strategies, however, require further research.
关键词：Vegetation parameters ; object-based image analysis ; radiative transfer modelling ; lookup-table based inversion ; open-source software ; leaf area index