Search Results - "Hyyppa, J"

Close-range hyperspectral spectroscopy reveals leaf water content dynamics by Junttila, S., Hölttä, T., Saarinen, N., Kankare, V., Yrttimaa, T., Hyyppä, J., Vastaranta, M.

“…Water plays a crucial role in maintaining plant functionality and drives many ecophysiological processes. The distribution of water resources is in a…”
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The potential of dual-wavelength terrestrial lidar in early detection of Ips typographus (L.) infestation – Leaf water content as a proxy by Junttila, S., Holopainen, M., Vastaranta, M., Lyytikäinen-Saarenmaa, P., Kaartinen, H., Hyyppä, J., Hyyppä, H.

“…Climate change is causing novel forest stress around the world due to changes in environmental conditions. Forest pest insects, such as Ips typographus (L.),…”
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Review of methods of small-footprint airborne laser scanning for extracting forest inventory data in boreal forests by Hyyppä, J., Hyyppä, H., Leckie, D., Gougeon, F., Yu, X., Maltamo, M.

“…Experiences from Nordic countries and Canada have shown that the retrieval of the stem volume and mean tree height of a tree or at stand level from laser…”
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Exploring tree growth allometry using two-date terrestrial laser scanning by Yrttimaa, T., Luoma, V., Saarinen, N., Kankare, V., Junttila, S., Holopainen, M., Hyyppä, J., Vastaranta, M.

“…[Display omitted] •Strong relationships (|r| > 0.8) were observed between stem growth and crown structure as well as competition metrics.•The competitive…”
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Capturing seasonal radial growth of boreal trees with terrestrial laser scanning by Yrttimaa, T., Junttila, S., Luoma, V., Calders, K., Kankare, V., Saarinen, N., Kukko, A., Holopainen, M., Hyyppä, J., Vastaranta, M.

“…[Display omitted] •Terrestrial laser scanning (TLS) was used to observe seasonal radial growth.•Dendrometers (n = 91) provided reference for radial growth…”
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Annual bank and point bar morphodynamics of a meandering river determined by high-accuracy multitemporal laser scanning and flow data by Lotsari, E., Vaaja, M., Flener, C., Kaartinen, H., Kukko, A., Kasvi, E., Hyyppä, H., Hyyppä, J., Alho, P.

“…The knowledge has been insufficient concerning the effects of peak flows, and local bend and flow characteristics on annual morphodynamics of consecutive bends…”
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Adding single tree features and correcting edge tree effects enhance the characterization of seedling stands with single-photon airborne laser scanning by Imangholiloo, M., Yrttimaa, T., Mattsson, T., Junttila, S., Holopainen, M., Saarinen, N., Savolainen, P., Hyyppä, J., Vastaranta, M.

“…[Display omitted] •Methodological improvements of ordinary area-based approach (ABA) by adding individual tree features and correcting edge tree effects…”
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Application of boat-based laser scanning for river survey by Alho, P., Kukko, A., Hyyppä, H., Kaartinen, H., Hyyppä, J., Jaakkola, A.

“…The boat‐based, mobile mapping system (BoMMS) with a laser scanner allows the derivation of detailed riverine topographical data for fluvial applications…”
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CONVOLUTIONAL NEURAL NETWORKS BASED GNSS SIGNAL CLASSIFICATION USING CORRELATOR-LEVEL MEASUREMENTS by Jiang, C., Chen, Y., Xu, B., Jia, J., Sun, H., He, Z., Wang, T., Hyyppä, J.

“…In urban areas, the None-Line-Of-Sight (NLOS) and Multipath (MP) signals are the major issues degrading the GNSS position accuracy. Signal reception type…”
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Estimation of timber volume and stem density based on scanning laser altimetry and expected tree size distribution functions by Maltamo, M., Eerikäinen, K., Pitkänen, J., Hyyppä, J., Vehmas, M.

“…Laser scanners of small footprint diameter and high sampling density provide possibility to obtain accurate height information on the forest canopy. When…”
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A segmentation-based method to retrieve stem volume estimates from 3-D tree height models produced by laser scanners by Hyyppa, J., Kelle, O., Lehikoinen, M., Inkinen, M.

“…In the boreal forest zone and in many forest areas, there exist gaps between the forest crowns. For example, in Finland, more than 30% of the first pulse data…”
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INTERACTIVE GEO-INFORMATION IN VIRTUAL REALITY – OBSERVATIONS AND FUTURE CHALLENGES by Virtanen, J.-P., Julin, A., Handolin, H., Rantanen, T., Maksimainen, M., Hyyppä, J., Hyyppä, H.

“…Visualization applications are an increasingly significant component in the field of 3D geo-information. In them, the utilization of consumer grade virtual…”
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Identifying and quantifying structural characteristics of heterogeneous boreal forests using laser scanner data by Maltamo, M., Packalén, P., Yu, X., Eerikäinen, K., Hyyppä, J., Pitkänen, J.

“…Structural characteristics of forest stands, e.g. in relation to carbon content and biodiversity, are of special interest. It has been stated in numerous…”
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Classification of Spruce and Pine Trees Using Active Hyperspectral LiDAR by Vauhkonen, J., Hakala, T., Suomalainen, J., Kaasalainen, S., Nevalainen, O., Vastaranta, M., Holopainen, M., Hyyppa, J.

“…Most forest inventories based on the use of remote-sensing data produce the required species-specific information by fusing data from different sources (e.g.,…”
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Obtaining plotwise mean height and volume growth in boreal forests using multi-temporal laser surveys and various change detection techniques by Yu, X., Hyyppä, J., Kaartinen, H., Maltamo, M., Hyyppä, H.

“…This study used high-density multitemporal laser scanner datasets acquired at different dates between 1998 and 2003 to estimate the tree mean height and volume…”
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Radiometric Calibration of LIDAR Intensity With Commercially Available Reference Targets by Kaasalainen, S., Hyyppa, H., Kukko, A., Litkey, P., Ahokas, E., Hyyppa, J., Lehner, H., Jaakkola, A., Suomalainen, J., Akujarvi, A., Kaasalainen, M., Pyysalo, U.

“…We present a new approach for radiometric calibration of light detection and ranging (LIDAR) intensity data and demonstrate an application of this method to…”
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QUALITY ANALYSIS AND CORRECTION OF MOBILE BACKPACK LASER SCANNING DATA by Rönnholm, P., Liang, X., Kukko, A., Jaakkola, A., Hyyppä, J.

“…Backpack laser scanning systems have emerged recently enabling fast data collection and flexibility to make measurements also in areas that cannot be reached…”
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Toward Hyperspectral Lidar: Measurement of Spectral Backscatter Intensity With a Supercontinuum Laser Source by Kaasalainen, S., Lindroos, T., Hyyppa, J.

“…We have tested the use of a supercontinuum laser source in laser-based spectral backscatter measurement. The calibration and first results with the prototype…”
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PRECISE INDOOR LOCALIZATION FOR MOBILE LASER SCANNER by Kaijaluoto, R., Hyyppä, A.

“…Accurate 3D data is of high importance for indoor modeling for various applications in construction, engineering and cultural heritage documentation. For the…”
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Estimation of stem volume using laser scanning-based canopy height metrics by Maltamo, M, Eerikäinen, K, Packalén, P, Hyyppä, J

“…The aim of this study was to test different stem volume predictors that are capable of utilizing laser scanning-based canopy height metrics as independent…”
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