Abstract
The need for up-to-date and accurate information on forest resources has rapidly increased in recent years. Forest mapping is an important source of information for the assessment of woodland resources and a key issue for any National Forest Inventory (NFI). Nowadays, new perspectives for automated forest mapping are emerging through the latest developments in remote sensing data and techniques. In this chapter, an overview of current remote sensing data and techniques for mapping woodland and forests, the challenges and requirements for optimization and automation, and the need for validating final products are presented. Special attention is paid to land use—a crucial criterion for forest mapping which, in contrast to land cover, cannot be easily derived from remotely sensed data. Three different approaches for extracting woodland areas (i.e., patches of trees and shrubs) are presented, all of which involve a high degree of automation. Two additional approaches, which are based on NFI forest definitions, are presented. These require the subdivision of woodlands into the classes “used for forestry” and “other use” and implement the criteria “height,” “minimum crown coverage,” “minimum area,” “minimum width,” and “land use”. Special attention is paid to connecting patches using distance criteria from national forest definitions. The main points of this chapter are as follows: (1) forest needs an exact definition which may differ depending on the country, (2) mapping woodland can be highly automated and is indispensable prior to mapping forests, and (3) forest mapping is now feasible using remote sensing data and techniques; however, it is less automated due to the implementation of a forest definition.
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Abbreviations
- ALS:
-
Airborne laser scanning
- CHM:
-
Canopy height model
- CIR:
-
Color-infrared
- DSM:
-
Digital surface model
- DTM:
-
Digital terrain model
- GLM:
-
Generalized linear model
- GSD:
-
Ground sample distance
- IGBP:
-
International geosphere biosphere program
- IP:
-
Interpretation plot
- ITC:
-
Individual tree crowns
- k-NN:
-
K-nearest neighbor
- LiDAR:
-
Light detection and ranging
- NDVI:
-
Normalized difference vegetation index
- NFI:
-
National forest inventory
- REDD:
-
Reducing emissions from deforestation and degradation
- SAR:
-
Synthetic aperture radar
- TOF:
-
Trees outside forest
- VHM:
-
Vegetation height model
- VHR:
-
Very high resolution
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Waser, L.T., Boesch, R., Wang, Z., Ginzler, C. (2017). Towards Automated Forest Mapping. In: Remmel, T., Perera, A. (eds) Mapping Forest Landscape Patterns. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-7331-6_7
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