Review on the Possibilities of Mapping Old-Growth Temperate Forests by Remote Sensing in Europe
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Published:2023-05-19
Issue:5
Volume:28
Page:761-785
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ISSN:1420-2026
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Container-title:Environmental Modeling & Assessment
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language:en
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Short-container-title:Environ Model Assess
Author:
Hirschmugl ManuelaORCID, Sobe Carina, Di Filippo Alfredo, Berger Vanessa, Kirchmeir Hanns, Vandekerkhove Kris
Abstract
AbstractOld-growth forests (OGF) provide valuable ecosystem services such as habitat provision, carbon sequestration or recreation maintaining biodiversity, carbon storage, or human well-being. Long-term human pressure caused OGFs in Europe to be rare and scattered. Their detailed extent and current status are largely unknown. This review aims to identify potential methods to map temperate old-growth forests (tOGF) by remote sensing (RS) technology, highlights the potentials and benefits, and identifies main knowledge gaps requesting further research. RS offers a wide range of data and methods to map forests and their properties, applicable from local to continental scale. We structured existing mapping approaches in three main groups. First, parameter-based approaches, which are based on forest parameters and usually applied on local to regional scale using detailed data, often from airborne laser scanning (ALS). Second, direct approaches, usually employing machine learning algorithms to generate information from RS data, with high potential for large-area mapping but so far lacking operational applications and related sound accuracy assessment. Finally, indirect approaches integrating various existing data sets to predict OGF existence. These approaches have also been used for large area mapping with a main drawback of missing physical evidence of the identified areas to really hold OGFs as compared to the likelihood of OGF existence. In conclusion, studies dealing with the mapping of OGF using remote sensing are quite limited, but there is a huge amount of knowledge from other forestry-related applications that is yet to be leveraged for OGF identification. We discuss two scenarios, where different data and approaches are suitable, recognizing that one single system cannot serve all potential needs. These may be hot spot identification, detailed area delineation, or status assessment. Further, we pledge for a combined method to overcome the identified limitations of the individual approaches.
Funder
European Commission JOANNEUM RESEARCH Forschungsgesellschaft mbH
Publisher
Springer Science and Business Media LLC
Subject
General Environmental Science
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