The Experts below are selected from a list of 11817 Experts worldwide ranked by ideXlab platform
Antero Kukko - One of the best experts on this subject based on the ideXlab platform.
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Terrestrial Laser Scanning in forest inventories
Isprs Journal of Photogrammetry and Remote Sensing, 2016Co-Authors: Juha Hyyppä, Antero Kukko, Ville Kankare, Xinlian Liang, Yunsheng WangAbstract:Abstract Decision making on forest resources relies on the precise information that is collected using inventory. There are many different kinds of forest inventory techniques that can be applied depending on the goal, scale, resources and the required accuracy. Most of the forest inventories are based on field sample. Therefore, the accuracy of the forest inventories depends on the quality and quantity of the field sample. Conventionally, field sample has been measured using simple tools. When map is required, remote sensing materials are needed. Terrestrial Laser Scanning (TLS) provides a measurement technique that can acquire millimeter-level of detail from the surrounding area, which allows rapid, automatic and periodical estimates of many important forest inventory attributes. It is expected that TLS will be operationally used in forest inventories as soon as the appropriate software becomes available, best practices become known and general knowledge of these findings becomes more wide spread. Meanwhile, mobile Laser Scanning, personal Laser Scanning, and image-based point clouds became capable of capturing similar Terrestrial point cloud data as TLS. This paper reviews the advances of applying TLS in forest inventories, discusses its properties with reference to other related techniques and discusses the future prospects of this technique.
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Stop-and-go mode: sensor manipulation as essential as sensor development in Terrestrial Laser Scanning.
Sensors, 2013Co-Authors: Yi Lin, Juha Hyyppä, Antero KukkoAbstract:This study was dedicated to illustrating the significance of sensor manipulation in the case of Terrestrial Laser Scanning, which is a field now in quick development. In fact, this quickness was mainly rooted in the emergence of new sensors with better performance, while the implications of sensor manipulation have not been fully recognized by the whole community. For this technical gap, the stop-and-go mapping mode can be reckoned as one of the potential solution plans. Stop-and-go was first proposed to handle the low efficiency of traditional static Terrestrial Laser Scanning, and then, it was re-emphasized to improve the stability of sample collections for the state-of-the-art technology of mobile Laser Scanning. This work reviewed the previous efforts of trying the stop-and-go mode for improving the performance of static and mobile Terrestrial Laser Scanning and generalized their principles respectively. This work also analyzed its advantages compared to the fully-static and fully-kinematic Terrestrial Laser Scanning, and suggested the plans with more automatic measures for raising the efficacy of Terrestrial Laser Scanning. Overall, this literature review indicated that the stop-and-go mapping mode as a case with generic sense can verify the presumption of sensor manipulation as essential as sensor development.
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Mobile Terrestrial Laser Scanning in urban tree inventory.
2011Co-Authors: Markus Holopainen, Juha Hyyppä, Antero Kukko, Mikko Vastaranta, Ville Kankare, Tuula Kantola, Harri Kaartinen, Matti Vaaja, Hannu HyyppäAbstract:In this study we evaluated an accuracy of mobile Terrestrial Laser Scanning (MLS) measurements in urban tree inventory. The MLS data were collected in August 2010 with the FGI Roamer mobile mapping system, consisting of a Faro LS 880 Laser scanner and a NovAtel HG1700 SPAN58 INS system mounted in a car. Study areas were divided to park and urban forest located in Seurasaari, Helsinki, Finland. Studied inventory characteristics were tree location and –diameter-at-breast-height (dbh). Reference measurements consisted altogether from 201 trees, which locations were measured using RTK GPS and static Terrestrial Laser Scanning while tree dbhs were measured using steel callipers. Tree mapping and dbh measurements were done from the MLS point clouds manually. Tree location accuracy of MLS measurements were 0.72 m in park and 0.47 cm in forest conditions as root mean squared error in dbh were 7.0% and 12.5%, respectively. MLS can be used in urban tree inventory in targets with a good visibility and relatively dense network of roads or paths.
Juha Hyyppä - One of the best experts on this subject based on the ideXlab platform.
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Poster on Detecting and Characterizing Dead Wood Using Terrestrial Laser Scanning
2020Co-Authors: Tuomas Yrttimaa, Juha Hyyppä, Markus Holopainen, Ville Kankare, Ninni Saarinen, Ville Luoma, Topi Tanhuanpää, Xinlian Liang, Mikko VastarantaAbstract:Dead wood is a key forest structural component for maintaining biodiversity and storing carbon. Despite its important role in a forest ecosystem, quantifying dead wood alongside standing trees has often neglected when investigating the feasibility of Terrestrial Laser Scanning (TLS) in forest inventories. The objective of this study was therefore to develop an automatic method for detecting and characterizing downed dead wood.
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Terrestrial Laser Scanning in forest inventories
Isprs Journal of Photogrammetry and Remote Sensing, 2016Co-Authors: Juha Hyyppä, Antero Kukko, Ville Kankare, Xinlian Liang, Yunsheng WangAbstract:Abstract Decision making on forest resources relies on the precise information that is collected using inventory. There are many different kinds of forest inventory techniques that can be applied depending on the goal, scale, resources and the required accuracy. Most of the forest inventories are based on field sample. Therefore, the accuracy of the forest inventories depends on the quality and quantity of the field sample. Conventionally, field sample has been measured using simple tools. When map is required, remote sensing materials are needed. Terrestrial Laser Scanning (TLS) provides a measurement technique that can acquire millimeter-level of detail from the surrounding area, which allows rapid, automatic and periodical estimates of many important forest inventory attributes. It is expected that TLS will be operationally used in forest inventories as soon as the appropriate software becomes available, best practices become known and general knowledge of these findings becomes more wide spread. Meanwhile, mobile Laser Scanning, personal Laser Scanning, and image-based point clouds became capable of capturing similar Terrestrial point cloud data as TLS. This paper reviews the advances of applying TLS in forest inventories, discusses its properties with reference to other related techniques and discusses the future prospects of this technique.
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Rapid Prototyping — A Tool for Presenting 3-Dimensional Digital Models Produced by Terrestrial Laser Scanning
ISPRS international journal of geo-information, 2014Co-Authors: Juho-pekka Virtanen, Matti Vaaja, Hannu Hyyppä, Matti Kurkela, Petteri Alho, Juha HyyppäAbstract:Rapid prototyping has received considerable interest with the introduction of affordable rapid prototyping machines. These machines can be used to manufacture physical models from three-dimensional digital mesh models. In this paper, we compare the results obtained with a new, affordable, rapid prototyping machine, and a traditional professional machine. Two separate data sets are used for this, both of which were acquired using Terrestrial Laser Scanning. Both of the machines were able to produce complex and highly detailed geometries in plastic material from models based on Terrestrial Laser Scanning. The dimensional accuracies and detail levels of the machines were comparable, and the physical artifacts caused by the fused deposition modeling (FDM) technique used in the rapid prototyping machines could be found in both models. The accuracy of Terrestrial Laser Scanning exceeded the requirements for manufacturing physical models of large statues and building segments at a 1:40 scale.
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Stop-and-go mode: sensor manipulation as essential as sensor development in Terrestrial Laser Scanning.
Sensors, 2013Co-Authors: Yi Lin, Juha Hyyppä, Antero KukkoAbstract:This study was dedicated to illustrating the significance of sensor manipulation in the case of Terrestrial Laser Scanning, which is a field now in quick development. In fact, this quickness was mainly rooted in the emergence of new sensors with better performance, while the implications of sensor manipulation have not been fully recognized by the whole community. For this technical gap, the stop-and-go mapping mode can be reckoned as one of the potential solution plans. Stop-and-go was first proposed to handle the low efficiency of traditional static Terrestrial Laser Scanning, and then, it was re-emphasized to improve the stability of sample collections for the state-of-the-art technology of mobile Laser Scanning. This work reviewed the previous efforts of trying the stop-and-go mode for improving the performance of static and mobile Terrestrial Laser Scanning and generalized their principles respectively. This work also analyzed its advantages compared to the fully-static and fully-kinematic Terrestrial Laser Scanning, and suggested the plans with more automatic measures for raising the efficacy of Terrestrial Laser Scanning. Overall, this literature review indicated that the stop-and-go mapping mode as a case with generic sense can verify the presumption of sensor manipulation as essential as sensor development.
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Mobile Terrestrial Laser Scanning in urban tree inventory.
2011Co-Authors: Markus Holopainen, Juha Hyyppä, Antero Kukko, Mikko Vastaranta, Ville Kankare, Tuula Kantola, Harri Kaartinen, Matti Vaaja, Hannu HyyppäAbstract:In this study we evaluated an accuracy of mobile Terrestrial Laser Scanning (MLS) measurements in urban tree inventory. The MLS data were collected in August 2010 with the FGI Roamer mobile mapping system, consisting of a Faro LS 880 Laser scanner and a NovAtel HG1700 SPAN58 INS system mounted in a car. Study areas were divided to park and urban forest located in Seurasaari, Helsinki, Finland. Studied inventory characteristics were tree location and –diameter-at-breast-height (dbh). Reference measurements consisted altogether from 201 trees, which locations were measured using RTK GPS and static Terrestrial Laser Scanning while tree dbhs were measured using steel callipers. Tree mapping and dbh measurements were done from the MLS point clouds manually. Tree location accuracy of MLS measurements were 0.72 m in park and 0.47 cm in forest conditions as root mean squared error in dbh were 7.0% and 12.5%, respectively. MLS can be used in urban tree inventory in targets with a good visibility and relatively dense network of roads or paths.
Ville Kankare - One of the best experts on this subject based on the ideXlab platform.
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Poster on Detecting and Characterizing Dead Wood Using Terrestrial Laser Scanning
2020Co-Authors: Tuomas Yrttimaa, Juha Hyyppä, Markus Holopainen, Ville Kankare, Ninni Saarinen, Ville Luoma, Topi Tanhuanpää, Xinlian Liang, Mikko VastarantaAbstract:Dead wood is a key forest structural component for maintaining biodiversity and storing carbon. Despite its important role in a forest ecosystem, quantifying dead wood alongside standing trees has often neglected when investigating the feasibility of Terrestrial Laser Scanning (TLS) in forest inventories. The objective of this study was therefore to develop an automatic method for detecting and characterizing downed dead wood.
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Terrestrial Laser Scanning in forest inventories
Isprs Journal of Photogrammetry and Remote Sensing, 2016Co-Authors: Juha Hyyppä, Antero Kukko, Ville Kankare, Xinlian Liang, Yunsheng WangAbstract:Abstract Decision making on forest resources relies on the precise information that is collected using inventory. There are many different kinds of forest inventory techniques that can be applied depending on the goal, scale, resources and the required accuracy. Most of the forest inventories are based on field sample. Therefore, the accuracy of the forest inventories depends on the quality and quantity of the field sample. Conventionally, field sample has been measured using simple tools. When map is required, remote sensing materials are needed. Terrestrial Laser Scanning (TLS) provides a measurement technique that can acquire millimeter-level of detail from the surrounding area, which allows rapid, automatic and periodical estimates of many important forest inventory attributes. It is expected that TLS will be operationally used in forest inventories as soon as the appropriate software becomes available, best practices become known and general knowledge of these findings becomes more wide spread. Meanwhile, mobile Laser Scanning, personal Laser Scanning, and image-based point clouds became capable of capturing similar Terrestrial point cloud data as TLS. This paper reviews the advances of applying TLS in forest inventories, discusses its properties with reference to other related techniques and discusses the future prospects of this technique.
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Mobile Terrestrial Laser Scanning in urban tree inventory.
2011Co-Authors: Markus Holopainen, Juha Hyyppä, Antero Kukko, Mikko Vastaranta, Ville Kankare, Tuula Kantola, Harri Kaartinen, Matti Vaaja, Hannu HyyppäAbstract:In this study we evaluated an accuracy of mobile Terrestrial Laser Scanning (MLS) measurements in urban tree inventory. The MLS data were collected in August 2010 with the FGI Roamer mobile mapping system, consisting of a Faro LS 880 Laser scanner and a NovAtel HG1700 SPAN58 INS system mounted in a car. Study areas were divided to park and urban forest located in Seurasaari, Helsinki, Finland. Studied inventory characteristics were tree location and –diameter-at-breast-height (dbh). Reference measurements consisted altogether from 201 trees, which locations were measured using RTK GPS and static Terrestrial Laser Scanning while tree dbhs were measured using steel callipers. Tree mapping and dbh measurements were done from the MLS point clouds manually. Tree location accuracy of MLS measurements were 0.72 m in park and 0.47 cm in forest conditions as root mean squared error in dbh were 7.0% and 12.5%, respectively. MLS can be used in urban tree inventory in targets with a good visibility and relatively dense network of roads or paths.
Xinlian Liang - One of the best experts on this subject based on the ideXlab platform.
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Poster on Detecting and Characterizing Dead Wood Using Terrestrial Laser Scanning
2020Co-Authors: Tuomas Yrttimaa, Juha Hyyppä, Markus Holopainen, Ville Kankare, Ninni Saarinen, Ville Luoma, Topi Tanhuanpää, Xinlian Liang, Mikko VastarantaAbstract:Dead wood is a key forest structural component for maintaining biodiversity and storing carbon. Despite its important role in a forest ecosystem, quantifying dead wood alongside standing trees has often neglected when investigating the feasibility of Terrestrial Laser Scanning (TLS) in forest inventories. The objective of this study was therefore to develop an automatic method for detecting and characterizing downed dead wood.
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Terrestrial Laser Scanning in forest inventories
Isprs Journal of Photogrammetry and Remote Sensing, 2016Co-Authors: Juha Hyyppä, Antero Kukko, Ville Kankare, Xinlian Liang, Yunsheng WangAbstract:Abstract Decision making on forest resources relies on the precise information that is collected using inventory. There are many different kinds of forest inventory techniques that can be applied depending on the goal, scale, resources and the required accuracy. Most of the forest inventories are based on field sample. Therefore, the accuracy of the forest inventories depends on the quality and quantity of the field sample. Conventionally, field sample has been measured using simple tools. When map is required, remote sensing materials are needed. Terrestrial Laser Scanning (TLS) provides a measurement technique that can acquire millimeter-level of detail from the surrounding area, which allows rapid, automatic and periodical estimates of many important forest inventory attributes. It is expected that TLS will be operationally used in forest inventories as soon as the appropriate software becomes available, best practices become known and general knowledge of these findings becomes more wide spread. Meanwhile, mobile Laser Scanning, personal Laser Scanning, and image-based point clouds became capable of capturing similar Terrestrial point cloud data as TLS. This paper reviews the advances of applying TLS in forest inventories, discusses its properties with reference to other related techniques and discusses the future prospects of this technique.
Ingo Neumann - One of the best experts on this subject based on the ideXlab platform.
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Terrestrial Laser Scanning technology for deformation monitoring and surface modeling of arch structures
Composite Structures, 2017Co-Authors: Hao Yang, Mohammad Omidalizarandi, Xiangyang Xu, Ingo NeumannAbstract:Abstract Terrestrial Laser Scanning (TLS) is capable to be a reliable deformation monitoring device with high-precision for concrete composite structures. Measurements based on TLS for an arch structure with monotonic loading is carried out. In this paper, comparison between original and optimized extraction of point clouds are presented. Surface approximation is implemented, where the vacant measurement area is also covered and the uncertainties of different-order surfaces are investigated. The results of surface approximation based on TLS measurement have certain relation with surface roughness of specimen, which will be eliminated by subtraction in deformation calculation.
