Search results for: Harri Kaartinen

Items from 1 to 20 out of 28 results

article

Forest in situ observations using unmanned aerial vehicle as an alternative of terrestrial measurements

Xinlian Liang, Yunsheng Wang, Jiri Pyörälä, Matti Lehtomäki, more

Forest Ecosystems > 2019 > 6 > 1 > 1-16

Background Lately, terrestrial point clouds have drawn attention as a new data source for in situ forest investigations. So far, terrestrial laser scanning (TLS) has the highest data quality among all terrestrial point cloud data in terms of geometric accuracy and level of detail (IEEE Transact Geosci Remote Sens 53: 5117–5132, 2015). The TLS point clouds processed by automated algorithms can provide...

article

In-situ measurements from mobile platforms: An emerging approach to address the old challenges associated with forest inventories

Xinlian Liang, Antero Kukko, Juha Hyyppä, Matti Lehtomäki, more

ISPRS Journal of Photogrammetry and Remote Sensing > 2018 > 143 > C > 97-107

Accurate assessments of forest resources rely on ground truth data that are collected via in-situ measurements, which are fundamental for all other statistical- and/or remote-sensing-based deductions on quantified forest attributes. The major bottleneck of the current in-situ observation system is that the data collection is time consuming, and, thus, limited in extent, which potentially biases any...

article

Graph SLAM correction for single scanner MLS forest data under boreal forest canopy

Antero Kukko, Risto Kaijaluoto, Harri Kaartinen, Ville V. Lehtola, more

ISPRS Journal of Photogrammetry and Remote Sensing > 2017 > 132 > C > 199-209

Mobile laser scanning (MLS) provides kinematic means to collect three dimensional data from surroundings for various mapping and environmental analysis purposes. Vehicle based MLS has been used for road and urban asset surveys for about a decade. The equipment to derive the trajectory information for the point cloud generation from the laser data is almost without exception based on GNSS-IMU (Global...

article

A Novel GNSS Technique for Predicting Boreal Forest Attributes at Low Cost

Jingbin Liu, Juha Hyyppa, Xiaowei Yu, Anttoni Jaakkola, more

IEEE Transactions on Geoscience and Remote Sensing > 2017 > 55 > 9 > 4855 - 4867

One of the biggest challenges in forestry research is the effective and accurate measuring and monitoring of forest variables, as the exploitation potential of forest inventory products largely depends on the accuracy of estimates and on the cost of data collection. This paper presented a novel computational method of low-cost forest inventory using global navigation satellite system (GNSS) signals...

article

Feasibility of Terrestrial laser scanning for collecting stem volume information from single trees

Ninni Saarinen, Ville Kankare, Mikko Vastaranta, Ville Luoma, more

ISPRS Journal of Photogrammetry and Remote Sensing > 2017 > 123 > C > 140-158

Interest in measuring forest biomass and carbon stock has increased as a result of the United Nations Framework Convention on Climate Change, and sustainable planning of forest resources is therefore essential. Biomass and carbon stock estimates are based on the large area estimates of growing stock volume provided by national forest inventories (NFIs). The estimates for growing stock volume based...

article

International Benchmarking of the Individual Tree Detection Methods for Modeling 3-D Canopy Structure for Silviculture and Forest Ecology Using Airborne Laser Scanning

Yunsheng Wang, Juha Hyyppa, Xinlian Liang, Harri Kaartinen, more

IEEE Transactions on Geoscience and Remote Sensing > 2016 > 54 > 9 > 5011 - 5027

Canopy structure plays an essential role in biophysical activities in forest environments. However, quantitative descriptions of a 3-D canopy structure are extremely difficult because of the complexity and heterogeneity of forest systems. Airborne laser scanning (ALS) provides an opportunity to automatically measure a 3-D canopy structure in large areas. Compared with other point cloud technologies...

article

Can global navigation satellite system signals reveal the ecological attributes of forests?

Jingbin Liu, Juha Hyyppä, Xiaowei Yu, Anttoni Jaakkola, more

International Journal of Applied Earth Observation and Geoinformation > 2016 > 50 > C > 74-79

Forests have important impacts on the global carbon cycle and climate, and they are also related to a wide range of industrial sectors. Currently, one of the biggest challenges in forestry research is effectively and accurately measuring and monitoring forest variables, as the exploitation potential of forest inventory products largely depends on the accuracy of estimates and on the cost of data collection...

article

Terrestrial laser scanning in forest inventories

Xinlian Liang, Ville Kankare, Juha Hyyppä, Yunsheng Wang, more

ISPRS Journal of Photogrammetry and Remote Sensing > 2016 > 115 > C > 63-77

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...

chapter

Scan matching technology for forest navigation with map information

Yuwei Chen, Jian Tang, Ehsan Khoramshahi, Teemu Hakala, more

2016 IEEE/ION Position, Location and Navigation Symposium (PLANS) > 198 - 203

2016 IEEE/ION Position, Location and Navigation Symposium - PLANS 2016

The topic of positioning in dense forest has attracted researchers' attention in the last few decades. Currently, accurate and robust positioning in complex forest environment is still not available by using standalone GNSS, and it is a major drawback for forestry automation. Laser scanning-based SLAM demonstrated its potential as an alternative positioning solution in dense boreal forest environment...

article

Object Classification and Recognition From Mobile Laser Scanning Point Clouds in a Road Environment

Matti Lehtomaki, Anttoni Jaakkola, Juha Hyyppa, Jouko Lampinen, more

IEEE Transactions on Geoscience and Remote Sensing > 2016 > 54 > 2 > 1226 - 1239

Automatic methods are needed to efficiently process the large point clouds collected using a mobile laser scanning (MLS) system for surveying applications. Machine-learning-based object recognition from MLS point clouds in a road and street environment was studied in order to create maps from the road environment infrastructure. The developed automatic processing workflow included the following phases:...

article

Gravel transport by ice in a subarctic river from accurate laser scanning

Eliisa Lotsari, Yunsheng Wang, Harri Kaartinen, Anttoni Jaakkola, more

Geomorphology > 2015 > 246 > C > 113-122

For decades the importance of ice and the effects of cold-region processes on river channel morphology have been discussed, with a general consensus as to their importance emerging only recently. River ice cover, anchor ice, frazil ice, and ice jams may not only scour the channel bed and banks but also pick up, transport, and deposit fine sediments and gravels during winter, especially during the...

article

Forest Data Collection Using Terrestrial Image-Based Point Clouds From a Handheld Camera Compared to Terrestrial and Personal Laser Scanning

Xinlian Liang, Yunsheng Wang, Anttoni Jaakkola, Antero Kukko, more

IEEE Transactions on Geoscience and Remote Sensing > 2015 > 53 > 9 > 5117 - 5132

Stereo images have long been the main practical data source for the high-accuracy retrieval of 3-D information over large areas. However, stereoscopy has been surpassed by laser scanning (LS) techniques in recent years, particularly in forested areas, because the reflection of laser points from object surfaces directly provides 3-D geometric features and because the laser beam has good penetration...

article

Sub-bend scale flow–sediment interaction of meander bends — A combined approach of field observations, close-range remote sensing and computational modelling

Elina Kasvi, Matti Vaaja, Harri Kaartinen, Antero Kukko, more

Geomorphology > 2015 > 238 > Complete > 119-134

Various field-based studies of meander development have been realised, yet fluviomorphological processes and their spatial patterns over bends are not fully understood. In this paper, the processes of three natural meander bends during a flood event are dissected using a unique study approach, which combines traditional field surveying, close-range remote sensing, and computational modelling. The...

article

Ground Level Determination in Forested Environment With Utilization of a Scanner-Centered Terrestrial Laser Scanning Configuration

Eetu Puttonen, Anssi Krooks, Harri Kaartinen, Sanna Kaasalainen

IEEE Geoscience and Remote Sensing Letters > 2015 > 12 > 3 > 616 - 620

Terrestrial laser scanning (TLS) configurations differ in several ways from airborne laser scanning (ALS) configurations. TLS point clouds have different distance, spatial, and noise distributions than ALS point clouds. Common ground-modeling methods have been first developed for ALS data and are not optimally suited for ground level determination from TLS data. In this letter, we present a ground...

article

Localization of mobile laser scanner using classical mechanics

Ville V. Lehtola, Juho-Pekka Virtanen, Antero Kukko, Harri Kaartinen, more

ISPRS Journal of Photogrammetry and Remote Sensing > 2015 > 99 > Complete > 25-29

We use a single 2D laser scanner to 3D scan indoor environments, without any inertial measurement units or reference coordinates. The localization is done directly from the point cloud in an intrinsic manner compared to other state-of-the-art mobile laser scanning methods where external inertial or odometry sensors are employed and synchronized with the laser scanner. Our approach is based on treating...

chapter

Precise carrier phase-based point positioning of boat-mounted terrestrial remote sensing platform

Constantin-Octavian Andrei, Antero Kukko, Harri Kaartinen, Chalermchon Satirapod

International Conference on Localization and GNSS 2014 (ICL-GNSS 2014) > 1 - 6

2014 International Conference on Localization and GNSS (ICL-GNSS)

Many professional communities nowadays require precise and accurate position information. Although various location technologies are integrated in one device, GNSS remains one of the main sources of precise positioning information. Traditionally, GNSS precise positioning has been achieved in relative mode using differential principles. On the other hand, with the technological advances in GNSS technology...

article

The Use of a Mobile Laser Scanning System for Mapping Large Forest Plots

Xinlian Liang, Juha Hyyppa, Antero Kukko, Harri Kaartinen, more

IEEE Geoscience and Remote Sensing Letters > 2014 > 11 > 9 > 1504 - 1508

Terrestrial laser scanning (TLS) has been demonstrated to be an efficient measurement method in plot-level forest inventories. A permanent sample plot in national forest inventories is typically a small area of forest with a radius of approximately 10 m. In practice, whether reference data can be automatically and accurately collected for larger plot sizes is of great interest. It is expensive to...

article

Morphological changes on meander point bars associated with flow structure at different discharges

Elina Kasvi, Matti Vaaja, Petteri Alho, Hannu Hyyppä, more

Earth Surface Processes and Landforms > 38 > 6 > 577 - 590

This study investigates the impact of flow structure of different discharges on meander point bar morphology. We carried out mobile and terrestrial laser scanning campaigns before and after a flood on two sandy‐bed point bars. Between the scans, the flow structure was examined using an Acoustic Doppler Current Profiler at three flow stages. The results indicated that a meander point bar both affects...

article

Tree mapping using airborne, terrestrial and mobile laser scanning – A case study in a heterogeneous urban forest

Markus Holopainen, Ville Kankare, Mikko Vastaranta, Xinlian Liang, more

Urban Forestry & Urban Greening > 2013 > 12 > 4 > 546-553

We evaluated the accuracy and efficiency of airborne (ALS), terrestrial (TLS) and mobile laser-scanning (MLS) methods that can be utilized in urban tree mapping and monitoring. In the field, 438 urban trees located in park and forested environments were measured and mapped from our study area located in Seurasaari, Helsinki, Finland. A field reference was collected, using a tree map created manually...

chapter

Comprehensive quantitative tree models from TLS data

Markku Akerblom, Pasi Raumonen, Mikko Kaasalainen, Sanna Kaasalainen, more

2012 IEEE International Geoscience and Remote Sensing Symposium > 6507 - 6510

IGARSS 2012 - 2012 IEEE International Geoscience and Remote Sensing Symposium

We present comprehensive and quantitative tree models reconstructed from terrestrial laser scanning data. The tree models consist of large number of cylinders whose location, size, and orientation locally approximate the geometry of the tree. The parent-child relations of the cylinders also record the topological branching structure of the tree. The modeling process is automatic and scale-independent...

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INFONA - science communication portal

Search results for: Harri Kaartinen

Forest in situ observations using unmanned aerial vehicle as an alternative of terrestrial measurements

In-situ measurements from mobile platforms: An emerging approach to address the old challenges associated with forest inventories

Graph SLAM correction for single scanner MLS forest data under boreal forest canopy

A Novel GNSS Technique for Predicting Boreal Forest Attributes at Low Cost

Feasibility of Terrestrial laser scanning for collecting stem volume information from single trees

International Benchmarking of the Individual Tree Detection Methods for Modeling 3-D Canopy Structure for Silviculture and Forest Ecology Using Airborne Laser Scanning

Can global navigation satellite system signals reveal the ecological attributes of forests?

Terrestrial laser scanning in forest inventories

Scan matching technology for forest navigation with map information

Object Classification and Recognition From Mobile Laser Scanning Point Clouds in a Road Environment

Gravel transport by ice in a subarctic river from accurate laser scanning

Forest Data Collection Using Terrestrial Image-Based Point Clouds From a Handheld Camera Compared to Terrestrial and Personal Laser Scanning

Sub-bend scale flow–sediment interaction of meander bends — A combined approach of field observations, close-range remote sensing and computational modelling

Ground Level Determination in Forested Environment With Utilization of a Scanner-Centered Terrestrial Laser Scanning Configuration

Localization of mobile laser scanner using classical mechanics

Precise carrier phase-based point positioning of boat-mounted terrestrial remote sensing platform

The Use of a Mobile Laser Scanning System for Mapping Large Forest Plots

Morphological changes on meander point bars associated with flow structure at different discharges

Tree mapping using airborne, terrestrial and mobile laser scanning – A case study in a heterogeneous urban forest

Comprehensive quantitative tree models from TLS data

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