XXII ISPRS Congress 2012: Technical Commission VIII

Shortis, M.; Shimoda, H.; Cho, K.

Bibliographic data

Multivolume work

Persistent identifier:: 1663813779

Title:: XXII ISPRS Congress 2012

Sub title:: Melbourne, Australia, 25 August-1 September 2012

Type of content:: Konferenzschrift

Year of publication:: 2013

Place of publication:: Red Hook, NY

Publisher of the original:: Curran Associates, Inc.

Identifier (digital):: 1663813779

Reihe:: ISPRS archives

Language:: English

Additional Notes:: Kongress-Thema: Imaging a sustainable future

Editor:: International Society for Photogrammetry and Remote Sensing

Author:: International Society for Photogrammetry and Remote Sensing, 22.; 2012; Melbourne

Document type:: Multivolume work

Volume

Persistent identifier:: 1663822514

Title:: Technical Commission VIII

Scope:: 590 Seiten

Type of content:: Konferenzschrift

DOI:: 10.14463/KXP:1663822514

Year of publication:: 2014

Place of publication:: Red Hook, NY

Publisher of the original:: Curran Associates, Inc.

Identifier (digital):: 1663822514

Illustration:: Illustrationen, Diagramme

Reihe:: ISPRS archives (volume 39, B8 (2012))

Signature of the source:: ZS 312(39,B8)

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist ermittelt.; Literaturangaben

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: Shortis, M.; Shimoda, H.; Cho, K.

Editor:: International Society for Photogrammetry and Remote Sensing

Author:: International Society for Photogrammetry and Remote Sensing, 22.; 2012; Melbourne

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2019

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: [VIII/7: Forestry]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: CROWN DELINEATION INFLUENCE ON STANDING VOLUME CALCULATIONS IN PROTECTED AREA K. Sterenczak, S. Miscicki,

Document type:: Multivolume work

Structure type:: Chapter

> XXXIX-B8, 2012 International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B8, 2012 XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia CROWN DELINEATION INFLUENCE ON STANDING VOLUME CALCULATIONS IN PROTECTED AREA K. Stereñczak*, S. Miscicki, Department of Forest Management, Geomatics and Economics, Faculty of Forestry, Warsaw University of Life Sciences - SGGW, 159 Nowoursynowska str., PL-02-776 Warszawa, Poland. Corresponding author e-mail: Krzysztof.Sterenczak@wl.sggw.pl Commission VIII, WG VIII/7 KEY WORDS: Forestry, LIDAR, Inventory, Crown Delineation, Protected Area ABSTRACT: The aim of this study was to evaluate the automatically determined parameters of tree crowns, which are then used in two-phase inventory method of growing stock. Research was performed in forest stands of different age, located in the Stolowe Mountains National Park (south-western Poland) where the dominant species was Norway spruce (Picea abies L.). On the test area of approximately 500 hectares, 35 sample plots were measured. On LIDAR-based Crow Height Model (CHM), in the places corresponding to the position of 500 n circular ground samples, automatic segmentation was carried out. The extent of the crown was associated with the height of the tree. Two variants of the assigning separate crowns in the sample were used: (1) according to the centroid position, (2) according to the location of any fragment of the crown inside the sample plot boundary. In each of the variants five series of measurements with different relative height of the range 0.65-0.8 (with a gap of 0.05) were carried out. Relationship between the volume of living trees measured on the ground and LIDAR parameters (average height of trees and tree canopy projection area) automatically measured based on CHM was determined. Multiple correlation coefficient differed depending on the location to extract coverage crowns and ranged from 0.687 to 0.788. The variant of counting of all trees with crowns or pieces inside the sample appeared to perform better. The relationship between the above-indicated characteristics was stronger after elimination of dead trees (about 0.1 for each of cases). This means that for measurements of the growing stock in forests under protection, it is necessary to improve the process of automatic segmentation of the crown, by identification and elimination of dead trees — usually present at sample plot. 1. INTRODUCTION surface and based on threshold, below which pixels are removed and not concerned as part of the crown. 1.1 General Instructions Airborne Laser Scanner (ALS) have been used for environment study for almost 20 years now (Baltsavias, 1999a, 1999b). Lotof different applications and research was done so far. Number of publications about using of ALS passed in the thousands per year. It is even impossible to read them all. Main forest parameters received with LIDAR data are: tree height (Nilsson, 1996; St-onge et al, 2004; Sterefczak and Zasada, 2011), volume (Naesset, 2002; Maltamo, 2004; Hollaus et al., 2007), biomass (Lefsky et al., 1999; Popescu et al., 2011) and many others (Næsset et al., 2004). Analysis can be based on à sample plot level or single tree level (Yu et al., 2010). Single tree detection methods were studded from very beginning. There were a lot of methods described in the literature. Two test carried out to compare different methods (Kaartinen and Hyyppä, 2008; Vauhkonen et al., 2010) proved that single tree methods give the best results for stands for Which were developed. If we would like to receive the best results, algorithms have to be parameterized additionally regarding to specifying stands structure and species composition. Crown threshold = 0.7 x Hmax 1.2 Tree Crown Delineation Ai : Tree segment based on threshold irborne Laser Scanner (ALS) was used for environment study but one from unsowed problem yet is properly crown definition. Many of them were already described (Kaartinen and Hyyppä, 2008). Figure 1 presents difference between crowns segments defined based on methods concentrating on slope of the crown Tree segment based on crown slope definition | Vi Figure 1. Tree crown delineation philosophy and its influence on crown segment size

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