Search Results - "Viljanen, Niko"

Individual Tree Detection and Classification with UAV-Based Photogrammetric Point Clouds and Hyperspectral Imaging by Nevalainen, Olli, Honkavaara, Eija, Tuominen, Sakari, Viljanen, Niko, Hakala, Teemu, Yu, Xiaowei, Hyyppä, Juha, Saari, Heikki, Pölönen, Ilkka, Imai, Nilton, Tommaselli, Antonio

“…Small unmanned aerial vehicle (UAV) based remote sensing is a rapidly evolving technology. Novel sensors and methods are entering the market, offering…”
Get full text

Estimating Biomass and Nitrogen Amount of Barley and Grass Using UAV and Aircraft Based Spectral and Photogrammetric 3D Features by Näsi, Roope, Viljanen, Niko, Kaivosoja, Jere, Alhonoja, Katja, Hakala, Teemu, Markelin, Lauri, Honkavaara, Eija

“…The timely estimation of crop biomass and nitrogen content is a crucial step in various tasks in precision agriculture, for example in fertilization…”
Get full text

Machine learning estimators for the quantity and quality of grass swards used for silage production using drone-based imaging spectrometry and photogrammetry by Oliveira, Raquel Alves, Näsi, Roope, Niemeläinen, Oiva, Nyholm, Laura, Alhonoja, Katja, Kaivosoja, Jere, Jauhiainen, Lauri, Viljanen, Niko, Nezami, Somayeh, Markelin, Lauri, Hakala, Teemu, Honkavaara, Eija

“…Drones offer entirely new prospects for precision agriculture. This study investigates the utilisation of drone remote sensing for managing and monitoring…”
Get full text

Using UAV-Based Photogrammetry and Hyperspectral Imaging for Mapping Bark Beetle Damage at Tree-Level by Näsi, Roope, Honkavaara, Eija, Lyytikäinen-Saarenmaa, Päivi, Blomqvist, Minna, Litkey, Paula, Hakala, Teemu, Viljanen, Niko, Kantola, Tuula, Tanhuanpää, Topi, Holopainen, Markus

“…Low-cost, miniaturized hyperspectral imaging technology is becoming available for small unmanned aerial vehicle (UAV) platforms. This technology can be…”
Get full text

A Novel Machine Learning Method for Estimating Biomass of Grass Swards Using a Photogrammetric Canopy Height Model, Images and Vegetation Indices Captured by a Drone by Viljanen, Niko, Honkavaara, Eija, Näsi, Roope, Hakala, Teemu, Niemeläinen, Oiva, Kaivosoja, Jere

“…Silage is the main feed in milk and ruminant meat production in Northern Europe. Novel drone-based remote sensing technology could be utilized in many phases…”
Get full text

Direct Reflectance Measurements from Drones: Sensor Absolute Radiometric Calibration and System Tests for Forest Reflectance Characterization by Hakala, Teemu, Markelin, Lauri, Honkavaara, Eija, Scott, Barry, Theocharous, Theo, Nevalainen, Olli, Näsi, Roope, Suomalainen, Juha, Viljanen, Niko, Greenwell, Claire, Fox, Nigel

“…Drone-based remote sensing has evolved rapidly in recent years. Miniaturized hyperspectral imaging sensors are becoming more common as they provide more…”
Get full text

Assessment of Classifiers and Remote Sensing Features of Hyperspectral Imagery and Stereo-Photogrammetric Point Clouds for Recognition of Tree Species in a Forest Area of High Species Diversity by Tuominen, Sakari, Näsi, Roope, Honkavaara, Eija, Balazs, Andras, Hakala, Teemu, Viljanen, Niko, Pölönen, Ilkka, Saari, Heikki, Ojanen, Harri

“…Recognition of tree species and geospatial information on tree species composition is essential for forest management. In this study, tree species recognition…”
Get full text

A Novel Tilt Correction Technique for Irradiance Sensors and Spectrometers On-Board Unmanned Aerial Vehicles by Suomalainen, Juha, Hakala, Teemu, Alves de Oliveira, Raquel, Markelin, Lauri, Viljanen, Niko, Näsi, Roope, Honkavaara, Eija

“…In unstable atmospheric conditions, using on-board irradiance sensors is one of the only robust methods to convert unmanned aerial vehicle (UAV)-based optical…”
Get full text

Multisensorial Close-Range Sensing Generates Benefits for Characterization of Managed Scots Pine (Pinus sylvestris L.) Stands by Yrttimaa, Tuomas, Saarinen, Ninni, Kankare, Ville, Viljanen, Niko, Hynynen, Jari, Huuskonen, Saija, Holopainen, Markus, Hyyppä, Juha, Honkavaara, Eija, Vastaranta, Mikko

“…Terrestrial laser scanning (TLS) provides a detailed three-dimensional representation of surrounding forest structures. However, due to close-range…”
Get full text

Fotogrammetrisen 3D-latvusmallin ja hyperspektri­aineiston käyttö aluetason puustotulkinnassa by Sakari Tuominen, Andras Balazs, Eija Honkavaara, Ilkka Pölönen, Heikki Saari, Teemu Hakala, Niko Viljanen

Get full text

Remote sensing of bark beetle damage in urban forests at individual tree level using a novel hyperspectral camera from UAV and aircraft by Näsi, Roope, Honkavaara, Eija, Blomqvist, Minna, Lyytikäinen-Saarenmaa, Päivi, Hakala, Teemu, Viljanen, Niko, Kantola, Tuula, Holopainen, Markus

“…•A remote sensing approach was developed for identifying bark beetle infestation.•A low-cost hyperspectral camera was operated from UAV and aircraft…”
Get full text

Assessing the effects of thinning on stem growth allocation of individual Scots pine trees by Saarinen, Ninni, Kankare, Ville, Yrttimaa, Tuomas, Viljanen, Niko, Honkavaara, Eija, Holopainen, Markus, Hyyppä, Juha, Huuskonen, Saija, Hynynen, Jari, Vastaranta, Mikko

“…•Thinning intensity and type affected stem shape and size of Scots pine trees.•Tree stem reconstructions from 3D information of TLS and UAV.•Novel attributes…”
Get full text

Remote Sensing of 3-D Geometry and Surface Moisture of a Peat Production Area Using Hyperspectral Frame Cameras in Visible to Short-Wave Infrared Spectral Ranges Onboard a Small Unmanned Airborne Vehicle (UAV) by Honkavaara, Eija, Eskelinen, Matti A., Polonen, Ilkka, Saari, Heikki, Ojanen, Harri, Mannila, Rami, Holmlund, Christer, Hakala, Teemu, Litkey, Paula, Rosnell, Tomi, Viljanen, Niko, Pulkkanen, Merja

“…Miniaturized hyperspectral imaging sensors are becoming available to small unmanned airborne vehicle (UAV) platforms. Imaging concepts based on frame format…”
Get full text

Hyperspectral UAV-imagery and photogrammetric canopy height model in estimating forest stand variables by Tuominen, Sakari, Balazs, Andras, Honkavaara, Eija, Pölönen, Ilkka, Saari, Heikki, Hakala, Teemu, Viljanen, Niko

“…Remote sensing using unmanned aerial vehicle (UAV) -borne sensors is currently a highly interesting approach for the estimation of forest characteristics. 3D…”
Get full text

Tree Species Identification Using 3D Spectral Data and 3D Convolutional Neural Network by Polonen, Ilkka, Annala, Leevi, Rahkonen, Samuli, Nevalainen, Olli, Honkavaara, Eija, Tuominen, Sakari, Viljanen, Niko, Hakala, Teemu

“…In this study we apply 3D convolutional neural network (CNN) for tree species identification. Study includes the three most common Finnish tree species. Study…”
Get full text

On the Estimation of the Leaf Angle Distribution from Drone Based Photogrammetry by Xu, Shan, Zaidan, Martha A., Honkavaara, Eija, Hakala, Teemu, Viljanen, Niko, Porcar-Castell, Albert, Liu, Zhigang, Atherton, Jon

“…Leaf angle distribution (LAD) is a key canopy structural parameter, playing an important role in light transfer. LAD can be estimated from fixed point of view…”
Get full text