Spatially Stratified and Multi-Stage Approach for National Land Cover Mapping Based on Sentinel-2 Data and Expert Knowledge

Portugal is building a land cover monitoring system to deliver land cover products annually for its mainland territory. This paper presents the methodology developed to produce a prototype relative to 2018 as the first land cover map of the future annual map series (COSsim). A total of thirteen land...

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Published inRemote sensing (Basel, Switzerland) Vol. 14; no. 8; p. 1865
Main Authors Costa, Hugo, Benevides, Pedro, Moreira, Francisco D., Moraes, Daniel, Caetano, Mário
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.04.2022
Subjects
Accuracy
Classification
Confidence intervals
COSsim
Data analysis
Forestry
Land cover
land cover land use
Land use
machine learning
Mapping
multi-temporal
Plant species
Product development
random forest
Regions
Remote sensing
satellite image
Task complexity
Greece
Portugal
Europe
Spain
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Abstract Portugal is building a land cover monitoring system to deliver land cover products annually for its mainland territory. This paper presents the methodology developed to produce a prototype relative to 2018 as the first land cover map of the future annual map series (COSsim). A total of thirteen land cover classes are represented, including the most important tree species in Portugal. The mapping approach developed includes two levels of spatial stratification based on landscape dynamics. Strata are analysed independently at the higher level, while nested sublevels can share data and procedures. Multiple stages of analysis are implemented in which subsequent stages improve the outputs of precedent stages. The goal is to adjust mapping to the local landscape and tackle specific problems or divide complex mapping tasks in several parts. Supervised classification of Sentinel-2 time series and post-classification analysis with expert knowledge were performed throughout four stages. The overall accuracy of the map is estimated at 81.3% (±2.1) at the 95% confidence level. Higher thematic accuracy was achieved in southern Portugal, and expert knowledge significantly improved the quality of the map.
AbstractList Portugal is building a land cover monitoring system to deliver land cover products annually for its mainland territory. This paper presents the methodology developed to produce a prototype relative to 2018 as the first land cover map of the future annual map series (COSsim). A total of thirteen land cover classes are represented, including the most important tree species in Portugal. The mapping approach developed includes two levels of spatial stratification based on landscape dynamics. Strata are analysed independently at the higher level, while nested sublevels can share data and procedures. Multiple stages of analysis are implemented in which subsequent stages improve the outputs of precedent stages. The goal is to adjust mapping to the local landscape and tackle specific problems or divide complex mapping tasks in several parts. Supervised classification of Sentinel-2 time series and post-classification analysis with expert knowledge were performed throughout four stages. The overall accuracy of the map is estimated at 81.3% (±2.1) at the 95% confidence level. Higher thematic accuracy was achieved in southern Portugal, and expert knowledge significantly improved the quality of the map.
Author Moreira, Francisco D.
Caetano, Mário
Costa, Hugo
Moraes, Daniel
Benevides, Pedro
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Snippet Portugal is building a land cover monitoring system to deliver land cover products annually for its mainland territory. This paper presents the methodology...
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StartPage 1865
SubjectTerms Accuracy
Classification
Confidence intervals
COSsim
Data analysis
Forestry
Land cover
land cover land use
Land use
machine learning
Mapping
multi-temporal
Plant species
Product development
random forest
Regions
Remote sensing
satellite image
Task complexity
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Title Spatially Stratified and Multi-Stage Approach for National Land Cover Mapping Based on Sentinel-2 Data and Expert Knowledge
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