Review of the detection and attribution of multi-type forest disturbances using an ensemble of spatio-temporal-spectral information from remote sensing images
Remote sensing time series contain information about the changes and differences in forest composition,structure,and function driven by natural factors and human activities.It provides theoretical support for forest disturbance detection and attribution by integrating spatio-temporal-spectral information from remote sensing time series data,which can effectively improve the understanding of the processes of forest succession,developmental trend,and their driving and response mechanism.This paper systematically reviewed the research progress of forest disturbance detection and attribution by integrating spatio-temporal-spectral information from remote sensing time series.The prerequisite for forest disturbance attribution is the detection of forest disturbance events,and the accuracy of disturbance detection directly affects the accuracy of subsequent attribution.In this paper,current forest disturbance detection methods and techniques are highlighted from multiple perspectives,including data(time series observation frequency selection),features(spectral feature selection,fusion of spatial and temporal feature),and algorithms(multi-algorithm integration,forest low-intensity disturbance detection).From the data perspective,based on the frequency of available observations in different regions,the change detection methods for dense and sparse time series are introduced respectively.From the feature perspective,the spectral response characteristics of forest disturbances are summarized.The change detection strategy of multi-spectral feature integration is introduced to address the problems of change detection based on single spectral features.The fusion of temporal and spatial features for forest disturbance detection is summarized.From the algorithmic perspective,to address issues such as differences in the results of different change detection algorithms and the fact that a single algorithm may not be the most efficient way to describe all conditions,two multi-algorithm integration strategies,parallel and serial,are presented.Based on our analysis of the reasons for the poor detection of low-intensity disturbances(e.g.,selective logging,pests and diseases,drought,etc.),progress in research on change detection oriented to mid-and low-intensity disturbances in forests is described.The essence of forest disturbance attribution is a classification problem involving multiple types of forest disturbances.This process identifies disturbance types by utilizing remote sensing features of forest disturbances caused by different driving factors as inputs for classification algorithms.In this paper,we first summarized attribution features as the input of forest disturbance attribution,that is,pre-,mid-,and post-disturbance features in chronological order and temporal,spatial,spectral,and topographic features in feature dimensions.Then,according to the condition of whether disturbance detection occurs before the attribution of disturbances,methods for attributing multiple types of forest disturbance are summarized and compared.These methods are based on the spatio-temporal-spectral and topographic features of remote sensing time series,including the direct method and the two-stage method.Lastly,we analyzed the current problems in forest disturbance monitoring using remote sensing and predicted the future research directions,such as the fusion of spatio-temporal-spectral features,simultaneous detection of forest multi-intensity disturbance,and attribution of forest multi-type disturbance under limited sample conditions.We hope this article becomes a reference for the detection and attribution of changes using an ensemble of spatio-temporal-spectral information from remote sensing time series.
forest disturbanceremote sensing time seriesspatio-temporal-spectral informationfeature ensembledisturbances detectionattribution of disturbances