Search Results - "Ronnholm, P."

UTILISING SIMULATED TREE DATA TO TRAIN SUPERVISED CLASSIFIERS by Rönnholm, P., Wittke, S., Ingman, M., Putkiranta, P., Kauhanen, H., Kaartinen, H., Vaaja, M. T.

“…The aim of our research was to examine whether simulated forest data can be utilized for training supervised classifiers. We included two classifiers namely…”
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DESIGNING AND BUILDING A COST-EFFICIENT SURVEY DRONE by Kauhanen, H., Rönnholm, P., Vaaja, M., Hyyppä, H.

“…In this paper, we present a workflow how to design and implement a low-cost survey drone that meets the quality requirements of a much higher cost drone…”
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WIRED AND WIRELESS CAMERA TRIGGERING WITH ARDUINO by Kauhanen, H., Rönnholm, P.

“…Synchronous triggering is an important task that allows simultaneous data capture from multiple cameras. Accurate synchronization enables 3D measurements of…”
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ON SELECTING IMAGES FROM AN UNAIMED VIDEO STREAM FOR PHOTOGRAMMETRIC MODELLING by Rönnholm, P., Vaaja, M. T., Kauhanen, H., Klockars, T.

“…In this paper, we illustrate how convolutional neural networks and voxel-based processing together with voxel visualizations can be utilized for the selection…”
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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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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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EXPERIENCES FROM THE PROJECT COURSE IN GEOINFORMATICS by Haggrén, H., Ståhle, P., Vaaja, M., Rönnholm, P., Sarkola, P., Rautiainen, M., Nordman, M., Nikander, J.

“…The aim of this paper is to share our experiences and thoughts about a project course in geoinformatics. The course has been organised annually since 2017. We…”
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MOTORIZED PANORAMIC CAMERA MOUNT - CALIBRATION AND IMAGE CAPTURE by Kauhanen, H., Rönnholm, P., Lehtola, V. V.

“…interesting applications. Among the large variation of panoramic camera systems, we have focused on concentric panoramic imaging with a frame camera. In order…”
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MOTORIZED PANORAMIC CAMERA MOUNT – CALIBRATION AND IMAGE CAPTURE by Kauhanen, H., Rönnholm, P., Lehtola, V. V.

“…interesting applications. Among the large variation of panoramic camera systems, we have focused on concentric panoramic imaging with a frame camera. In order…”
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REGISTRATION OF LASER SCANNING POINT CLOUDS AND AERIAL IMAGES USING EITHER ARTIFICIAL OR NATURAL TIE FEATURES by Rönnholm, P., Haggrén, H.

“…Integration of laser scanning data and photographs is an excellent combination regarding both redundancy and complementary. Applications of integration vary…”
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SHAPE FUNCTION-BASED ESTIMATION OF DEFORMATION WITH MOVING CAMERAS ATTACHED TO THE DEFORMING BODY by Jokinen, O., Ranta, I., Haggrén, H., Rönnholm, P.

“…The paper presents a novel method to measure 3-D deformation of a large metallic frame structure of a crane under loading from one to several images, when the…”
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LOCALIZATION CORRECTIONS FOR MOBILE LASER SCANNER USING LOCAL SUPPORT-BASED OUTLIER FILTERING by Lehtola, V. V., Virtanen, J.-P., Rönnholm, P., Nüchter, A.

“…Following the pioneering work introduced in [Lehtola et al., ISPRS J. Photogramm. Remote Sens. 99, 2015, pp. 25–29], we extend the state-of-the-art intrinsic…”
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SHAPE FUNCTION-BASED ESTIMATION OF DEFORMATION WITH MOVING CAMERAS ATTACHED TO THE DEFORMING BODY by Jokinen, O., Ranta, I., Haggrén, H., Rönnholm, P.

“…The paper presents a novel method to measure 3-D deformation of a large metallic frame structure of a crane under loading from one to several images, when the…”
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LOCALIZATION CORRECTIONS FOR MOBILE LASER SCANNER USING LOCAL SUPPORT-BASED OUTLIER FILTERING by Lehtola, V. V., Virtanen, J.-P., Rönnholm, P., Nüchter, A.

“…Following the pioneering work introduced in [Lehtola et al., ISPRS J. Photogramm. Remote Sens. 99, 2015, pp. 25–29], we extend the state-of-the-art intrinsic…”
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IMAGE ACQUISITION CONSTRAINTS FOR PANORAMIC FRAME CAMERA IMAGING by Kauhanen, H., Rönnholm, P.

“…The paper describes an approach to quantify the amount of projective error produced by an offset of projection centres in a panoramic imaging workflow. We have…”
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FUSION OF MOBILE LASER SCANNING AND PANORAMIC IMAGES FOR STUDYING RIVER ENVIRONMENT TOPOGRAPHY AND CHANGES by Vaaja, M., Kurkela, M., Hyyppä, H., Alho, P., Hyyppä, J., Kukko, A., Kaartinen, H., Kasvi, E., Kaasalainen, S., Rönnholm, P.

“…In recent years, laser scanning measurements have been widely used to detect topographic and urban features. In this article, we present a method to integrate…”
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Carbon dioxide and methane fluxes from mounds of African fungus-growing termites by Räsänen, Matti, Vesala, Risto, Rönnholm, Petri, Arppe, Laura, Manninen, Petra, Jylhä, Markus, Rikkinen, Jouko, Pellikka, Petri, Rinne, Janne

“…Termites play an essential role in decomposing dead plant material in tropical ecosystems and are thus major sources of gaseous C emissions in many…”
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Calibration of laser-derived tree height estimates by means of photogrammetric techniques by Ronnholm, P, Hyyppa, J, Hyyppa, H, Haggren, H, Yu, X, Kaartinen, H

“…Techniques based on laser point clouds and digital terrestrial images were demonstrated for the calibration of tree-height estimation. Individual tree heights…”
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A comparison between one- and two-field 60 degree fundus photography when screening for diabetic retinopathy by von Wendt, G, Rönnholm, P, Heikkilä, K, Summanen, P

“…To compare the severity level of diabetic retinopathy obtained when assessed from two versus only one 60 degrees photographic field using colour transparencies…”
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Map updating and change detection using vehicle-based laser scanning by Hyyppa, J., Jaakkola, A., Hyyppa, H., Kaartinen, H., Kukko, A., Holopainen, M., Lingli Zhu, Vastaranta, M., Kaasalainen, S., Krooks, A., Litkey, P., Lyytikainen-Saarenmaa, P., Matikainen, L., Ronnholm, P., Ruizhi Chen, Yuwei Chen, Kivilahti, A., Kosonen, I.

“…The vehicle-based laser scanning (VLS, also known as mobile mapping) is a new technology, which is currently under development for creating 3D models of the…”
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