Search results for: Ville Kankare

Items from 1 to 20 out of 20 results

article

Confirmation of post-harvest spectral recovery from Landsat time series using measures of forest cover and height derived from airborne laser scanning data

Joanne C. White, Ninni Saarinen, Ville Kankare, Michael A. Wulder, more

Remote Sensing of Environment > 2018 > 216 > C > 262-275

Landsat time series (LTS) enable the characterization of forest recovery post-disturbance over large areas; however, there is a gap in our current knowledge concerning the linkage between spectral measures of recovery derived from LTS and actual manifestations of forest structure in regenerating stands. Airborne laser scanning (ALS) data provide useful measures of forest structure that can be used...

article

Reconstructing Stem Cross Section Shapes From Terrestrial Laser Scanning

Di Wang, Ville Kankare, Eetu Puttonen, Markus Hollaus, more

IEEE Geoscience and Remote Sensing Letters > 2017 > 14 > 2 > 272 - 276

Terrestrial laser scanning (TLS) is an effective tool for retrieving forest attributes. For example, stem diameters can be estimated from the TLS point cloud by applying automatic algorithms, which often approximate the stem cross section by using a circle or a cylinder. However, the cross section of a tree stem is never exactly a circle. Moreover, the cross section provides other economically important...

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

Assessing above-ground biomass of open-grown urban trees: A comparison between existing models and a volume-based approach

Topi Tanhuanpää, Ville Kankare, Heikki Setälä, Vesa Yli-Pelkonen, more

Urban Forestry & Urban Greening > 2017 > 21 > C > 239-246

Assessment of the amount of carbon sequestered and the value of ecosystem services provided by urban trees requires reliable data. Predicting the proportions and allometric relationships of individual urban trees with models developed for trees in rural forests may result in significant errors in biomass calculations. To better understand the differences in biomass accumulation and allocation between...

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...

article

Geometrically explicit description of forest canopy based on 3D triangulations of airborne laser scanning data

Jari Vauhkonen, Markus Holopainen, Ville Kankare, Mikko Vastaranta, more

Remote Sensing of Environment > 2016 > 173 > C > 248-257

Geometrically explicit parameterizations of the locations, orientations and properties of trees and canopy elements are useful for forest ecosystem modeling. Detailed reconstructions based on real tree geometry are, however, hard to obtain based on conventional field measurements and sampling. We describe and evaluate an alternative approach to reconstruct the forest canopy from sparse, leaf-off airborne...

article

Diameter distribution estimation with laser scanning based multisource single tree inventory

Ville Kankare, Xinlian Liang, Mikko Vastaranta, Xiaowei Yu, more

ISPRS Journal of Photogrammetry and Remote Sensing > 2015 > 108 > C > 161-171

Tree detection and tree species recognition are bottlenecks of the airborne remote sensing-based single tree inventories. The effect of these factors in forest attribute estimation can be reduced if airborne measurements are aided with tree mapping information that is collected from the ground. The main objective here was to demonstrate the use of terrestrial laser scanning-derived (TLS) tree maps...

chapter

Deriving canopy metrics of urban trees from airborne laser scanning data

Topi Tanhuanpaa, Ville Kankare, Mikko Vastaranta, Ninni Saarinen, more

2015 Joint Urban Remote Sensing Event (JURSE) > 1 - 4

2015 Joint Urban Remote Sensing Event (JURSE)

This study describes an automatic method for assessing various crown metrics for urban trees. We used high resolution (>20 points/m2) airborne laser scanning (ALS) data to derive four key characteristics for roadside trees at individual tree level. The tree level ALS point clouds were filtered with alpha shapes to exclude non-tree objects and measurements were taken directly from the filtered point...

chapter

Allocating tree crown pruning with ALS-data - A case study in the city of Helsinki

Ville Luoma, Topi Tanhuanpaa, Markus Holopainen, Mikko Vastaranta, more

2015 Joint Urban Remote Sensing Event (JURSE) > 1 - 4

2015 Joint Urban Remote Sensing Event (JURSE)

Trees are an essential part of urban environments. In urban areas trees are located for example among buildings, on roadsides and in parks. When growing outside of their typical natural forest habitat, the trees need to be actively managed to ensure their well-being and the safety of the citizens. One example of urban tree management is the need to make sure that the street areas are sufficiently...

article

Accuracy in estimation of timber assortments and stem distribution – A comparison of airborne and terrestrial laser scanning techniques

Ville Kankare, Jari Vauhkonen, Topi Tanhuanpää, Markus Holopainen, more

ISPRS Journal of Photogrammetry and Remote Sensing > 2014 > 97 > Complete > 89-97

Detailed information about timber assortments and diameter distributions is required in forest management. Forest owners can make better decisions concerning the timing of timber sales and forest companies can utilize more detailed information to optimize their wood supply chain from forest to factory. The objective here was to compare the accuracies of high-density laser scanning techniques for the...

article

Automated Stem Curve Measurement Using Terrestrial Laser Scanning

Xinlian Liang, Ville Kankare, Xiaowei Yu, Juha Hyyppa, more

IEEE Transactions on Geoscience and Remote Sensing > 2014 > 52 > 3 > 1739 - 1748

This paper reports on a study of measuring stem curves of standing trees of different species and in different growth stages using terrestrial laser scanning (TLS). Pine and spruce trees are scanned using the multiscan approach in the field, and trees are felled to measure them destructively for the purpose of obtaining reference values. The stem curves are automatically retrieved from laser point...

article

TerraSAR-X Stereo Radargrammetry and Airborne Scanning LiDAR Height Metrics in Imputation of Forest Aboveground Biomass and Stem Volume

Mikko Vastaranta, Markus Holopainen, Mika Karjalainen, Ville Kankare, more

IEEE Transactions on Geoscience and Remote Sensing > 2014 > 52 > 2 > 1197 - 1204

Our objective is to evaluate the boreal forest aboveground biomass (AGB) and stem volume (VOL) imputation accuracy when scanning LiDAR or TerraSAR-X stereo radargrammetry-derived point-height metrics are used as predictors in the nearest neighbor imputation approach. Treewise measured field plots are used as reference data in the AGB and VOL imputations and accuracy evaluations. The digital terrain...

article

Validation of Mobile Laser Scanning for Understory Tree Characterization in Urban Forest

Yi Lin, Markus Holopainen, Ville Kankare, Juha Hyyppa

IEEE Journal of Selected Topics in Applied Earth Observations and Remote... > 2014 > 7 > 7 > 3167 - 3173

This study was dedicated to validating mobile laser scanning (MLS) for understory tree characterization, which now is still an open issue of interest in the fields of forest inventory and remote sensing. The program of validation was divided into three steps aiming at its three premise questions, respectively: 1) Can MLS record echoes with precise coordinates in the scenario of forest overstory shading...

article

Mapping of urban roadside trees – A case study in the tree register update process in Helsinki City

Topi Tanhuanpää, Mikko Vastaranta, Ville Kankare, Markus Holopainen, more

Urban Forestry & Urban Greening > 2014 > 13 > 3 > 562-570

This case study describes a method for utilizing leaf-off airborne laser scanning (ALS) data for mapping characteristics of urban trees. ALS data were utilized to detect and update all street trees in the tree inventory of the City of Helsinki, Finland. The inventory consists of roughly 20,000 street trees with mean diameter at breast height (DBH) of 24cm and mean height of 10.6m. The large number...

article

Single tree biomass modelling using airborne laser scanning

Ville Kankare, Minna Räty, Xiaowei Yu, Markus Holopainen, more

ISPRS Journal of Photogrammetry and Remote Sensing > 2013 > 85 > Complete > 66-73

Accurate forest biomass mapping methods would provide the means for e.g. detecting bioenergy potential, biofuel and forest-bound carbon. The demand for practical biomass mapping methods at all forest levels is growing worldwide, and viable options are being developed. Airborne laser scanning (ALS) is a promising forest biomass mapping technique, due to its capability of measuring the three-dimensional...

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...

article

Individual tree biomass estimation using terrestrial laser scanning

Ville Kankare, Markus Holopainen, Mikko Vastaranta, Eetu Puttonen, more

ISPRS Journal of Photogrammetry and Remote Sensing > 2013 > 75 > Complete > 64-75

Determination of stem and crown biomass requires accurate measurements of individual tree stem, bark, branch and needles. These measurements are time-consuming especially for mature trees. Accurate field measurements can be done only in a destructive manner. Terrestrial laser scanning (TLS) measurements are a viable option for measuring the reference information needed. TLS measurements provide dense...

chapter

SAR radargrammetry and scanning LiDAR in predicting forest canopy height

Mikko Vastaranta, Markus Holopainen, Mika Karjalainen, Ville Kankare, more

2012 IEEE International Geoscience and Remote Sensing Symposium > 6515 - 6518

IGARSS 2012 - 2012 IEEE International Geoscience and Remote Sensing Symposium

Our objective was to evaluate the accuracy of estimating forest canopy height when using scanning LiDAR and TerraSAR-X stereo radargrammetry. The study area was located in southern Finland. We used SAR radargrammetry and LiDAR to extract 3D point clouds to derive predictors used in the non-parametric prediction of forest canopy height. We used tree-wise measured field plots (n=110) as reference data...

article

Prediction of plot-level forest variables using TerraSAR-X stereo SAR data

Mika Karjalainen, Ville Kankare, Mikko Vastaranta, Markus Holopainen, more

Remote Sensing of Environment > 2012 > 117 > Complete > 338-347

Promising results have been obtained in recent years in the use of high-resolution X-band stereo SAR satellite images (with the spatial resolution being in order of meters) in the extraction of elevation data. In the case of forested areas, the extracted elevation values appear to be somewhere between the ground surface and the top of the canopy, depending on the forest characteristics. If the ground...

article

Combination of individual tree detection and area-based approach in imputation of forest variables using airborne laser data

Mikko Vastaranta, Ville Kankare, Markus Holopainen, Xiaowei Yu, more

ISPRS Journal of Photogrammetry and Remote Sensing > 2012 > 67 > Complete > 73-79

The two main approaches to deriving forest variables from laser-scanning data are the statistical area-based approach (ABA) and individual tree detection (ITD). With ITD it is feasible to acquire single tree information, as in field measurements. Here, ITD was used for measuring training data for the ABA. In addition to automatic ITD (ITD _auto ), we tested a combination of ITD _auto ...

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