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Statements

Subject Item
n2:RIV%2F00027073%3A_____%2F13%3A%230001518%21RIV14-GA0-00027073
rdf:type
skos:Concept n8:Vysledek
dcterms:description
With the development of terrestrial laser scanning (TLS) and its applications in forestry, the question arises as to how the scanners should be ideally placed for the best possible data acquisition. We searched for an optimal scanning distance for recognition of stems in natural beech-dominated forests, focusing particularly on the shading effect of tree stems and terrain. Recognised tree stems in TLS point clouds were compared with reference stem maps. A GIS-based visibility simulation was carried out to enhance the quantitative assessment and generalizability of results. The analyses also include the additive effect of multiple scanning positions. Single scans only have a tree recognition rate above 80% up to a distance of 15mfrom the scanner; using at least three scanning positions a comparable recognition rate was attained up to 20–25 m. A simulated coverage of a beech-dominated natural forest by laser beams using a 40 m square grid of scanning positions captured at least half of the stem perimeter for more than 90% of trees with a DBH >= 10 cm. In sites with rough terrain, the relief configuration has a more significant effect of occlusion than present tree stems. With the development of terrestrial laser scanning (TLS) and its applications in forestry, the question arises as to how the scanners should be ideally placed for the best possible data acquisition. We searched for an optimal scanning distance for recognition of stems in natural beech-dominated forests, focusing particularly on the shading effect of tree stems and terrain. Recognised tree stems in TLS point clouds were compared with reference stem maps. A GIS-based visibility simulation was carried out to enhance the quantitative assessment and generalizability of results. The analyses also include the additive effect of multiple scanning positions. Single scans only have a tree recognition rate above 80% up to a distance of 15mfrom the scanner; using at least three scanning positions a comparable recognition rate was attained up to 20–25 m. A simulated coverage of a beech-dominated natural forest by laser beams using a 40 m square grid of scanning positions captured at least half of the stem perimeter for more than 90% of trees with a DBH >= 10 cm. In sites with rough terrain, the relief configuration has a more significant effect of occlusion than present tree stems.
dcterms:title
Arrangement of terrestrial laser scanner positions for area-wide stem mapping of natural forests Arrangement of terrestrial laser scanner positions for area-wide stem mapping of natural forests
skos:prefLabel
Arrangement of terrestrial laser scanner positions for area-wide stem mapping of natural forests Arrangement of terrestrial laser scanner positions for area-wide stem mapping of natural forests
skos:notation
RIV/00027073:_____/13:#0001518!RIV14-GA0-00027073
n8:predkladatel
n9:ico%3A00027073
n4:aktivita
n16:S n16:P
n4:aktivity
P(GAP504/10/2018), S
n4:cisloPeriodika
4
n4:dodaniDat
n15:2014
n4:domaciTvurceVysledku
n6:6810578 n6:3600416 n6:8749051 n6:1091859
n4:druhVysledku
n14:J
n4:duvernostUdaju
n13:S
n4:entitaPredkladatele
n19:predkladatel
n4:idSjednocenehoVysledku
62093
n4:idVysledku
RIV/00027073:_____/13:#0001518
n4:jazykVysledku
n17:eng
n4:klicovaSlova
forest inventory; terrestrial laser scanner
n4:klicoveSlovo
n7:terrestrial%20laser%20scanner n7:forest%20inventory
n4:kodStatuVydavatele
CA - Kanada
n4:kontrolniKodProRIV
[6A7680F8A048]
n4:nazevZdroje
Canadian Journal of Forest Research
n4:obor
n18:GK
n4:pocetDomacichTvurcuVysledku
4
n4:pocetTvurcuVysledku
4
n4:projekt
n10:GAP504%2F10%2F2018
n4:rokUplatneniVysledku
n15:2013
n4:svazekPeriodika
43
n4:tvurceVysledku
Adam, Dušan Král, Kamil Janík, David Trochta, Jan
n4:wos
000318024900005
s:issn
0045-5067
s:numberOfPages
9
n12:doi
10.1139/cjfr-2012-0347