Extracting Canopy Surface Texture from Airborne Laser Scanning Data for the Supervised and Unsupervised Prediction of Area-Based Forest Characteristics

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http://hdl.handle.net/10138/175355

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Niemi , M T & Vauhkonen , J 2016 , ' Extracting Canopy Surface Texture from Airborne Laser Scanning Data for the Supervised and Unsupervised Prediction of Area-Based Forest Characteristics ' , Remote Sensing , vol. 8 , no. 7 , 582 . https://doi.org/10.3390/rs8070582

Title: Extracting Canopy Surface Texture from Airborne Laser Scanning Data for the Supervised and Unsupervised Prediction of Area-Based Forest Characteristics
Author: Niemi, Mikko T.; Vauhkonen, Jari
Contributor: University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
Date: 2016-07
Language: eng
Number of pages: 21
Belongs to series: Remote Sensing
ISSN: 2072-4292
URI: http://hdl.handle.net/10138/175355
Abstract: Area-based analyses of airborne laser scanning (ALS) data are an established approach to obtain wall-to-wall predictions of forest characteristics for vast areas. The analyses of sparse data in particular are based on the height value distributions, which do not produce optimal information on the horizontal forest structure. We evaluated the complementary potential of features quantifying the textural variation of ALS-based canopy height models (CHMs) for both supervised (linear regression) and unsupervised (k-Means clustering) analyses. Based on a comprehensive literature review, we identified a total of four texture analysis methods that produced rotation-invariant features of different order and scale. The CHMs and the textural features were derived from practical sparse-density, leaf-off ALS data originally acquired for ground elevation modeling. The features were extracted from a circular window of 254 m(2) and related with boreal forest characteristics observed from altogether 155 field sample plots. Features based on gray-level histograms, distribution of forest patches, and gray-level co-occurrence matrices were related with plot volume, basal area, and mean diameter with coefficients of determination (R-2) of up to 0.63-0.70, whereas features that measured the uniformity of local binary patterns of the CHMs performed poorer. Overall, the textural features compared favorably with benchmark features based on the point data, indicating that the textural features contain additional information useful for the prediction of forest characteristics. Due to the developed processing routines for raster data, the CHM features may potentially be extracted with a lower computational burden, which promotes their use for applications such as pre-stratification or guiding the field plot sampling based solely on ALS data.
Subject: forest inventory
Light Detection And Ranging (LiDAR)
surface modeling
Inverse DistanceWeighting (IDW) interpolation
image texture anisotropy
LOCAL BINARY PATTERNS
ALPHA SHAPE METRICS
LIDAR DATA
NONPARAMETRIC-ESTIMATION
AERIAL PHOTOGRAPHS
BRITISH-COLUMBIA
SPATIAL-PATTERN
INVENTORY DATA
DENSITY MODEL
IMAGE TEXTURE
4112 Forestry
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