The Conception of Test Fields for Fast Geometric Calibration of the FLIR VUE PRO Thermal Camera for Low-Cost UAV Applications

Sensors, Journal Year: 2022, Volume and Issue: 22(7), P. 2468 - 2468

Published: March 23, 2022

The dynamic evolution of photogrammetry led to the development numerous methods geometric calibration cameras, which are mostly based on building flat targets (fields) with features that can be distinguished in images. Geometric thermal cameras for UAVs is an active research field attracts researchers. As a result their low price and general availability, non-metric being increasingly used measurement purposes. Apart from resolution, sensors do not have any other known parameters. commonly applied process self-calibration, enables determining approximate elements camera's interior orientation. purpose this work was analyze possibilities UAV using proposed test patterns materials. experiment conducted FLIR VUE PRO camera dedicated platforms. authors propose selection various image processing (histogram equalization, thresholding, brightness correction) order improve quality thermograms. consecutive resulted over 80% effectiveness average by 94%, 81%, 80 %, respectively. This effectiveness, no use filtering method, was: 42% 38%, Only high-pass did obtained results. final results method structure fields were verified chosen algorithms. fast low-cost satisfactory, especially terms automation process. For correction, standard deviations specific thermogram sharpness enhancement two three times better than without correction.

Language: Английский

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Supplementing aerial drone surveys with biotelemetry data validates wildlife detection probabilities

Frontiers in Conservation Science, Journal Year: 2023, Volume and Issue: 4

Published: Aug. 25, 2023

Aerial drone systems are now widely used to survey wildlife, but validation in the detectability of individuals is rarely assessed. This knowledge gap critical, given influence local environments on wildlife from air. In this study, we integrated Animal Biotelemetry technology with aerial drones evaluate temporal and environmental factors influencing animal detection probability subsequent population estimates. Wild-caught feral pigs (Sus scrofa) were fitted GPS tracking collars releasing them into a large natural habitat enclosure northern Australia. Utilizing fixed-wing equipped dual camera (thermal infrared RGB), conducted multiple flights over study area during both wet dry seasons, sunrise sunset. The found that pig was visible imagery highly variable depending timing survey. Detection at its lowest mid-afternoon (5 20%), while early evening yielded highest (50 75%). We observed seasonal differences, probabilities exceeding 50% mornings season, contrast less than 30% season. Temporal trends similar thermal RGB imagery. location data enabled us assess how localized (canopy cover, land ambient temperature) altered probability. information facilitated identification times maximize development correction factor account for non-detected specific locations. demonstrates value integrating variations when undertaking surveys. Insights gained approach have implications enhancing accuracy assessments contributing more effective management conservation.

Language: Английский

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Thermal Drone Technology Used to Capture Thermoregulation in Wild Sumatran Elephants

HAYATI Journal of Biosciences, Journal Year: 2023, Volume and Issue: 30(6), P. 1061 - 1070

Published: Aug. 4, 2023

Drone technology plays a critical role in supporting conservation efforts for endangered species, not only terms of species monitoring within various landscapes, but also potentially when applied to behavioral studies investigate interaction patterns and response environmental change. We tested thermal drone thermoregulation surface temperature wild Sumatran elephants the lowland tropical forest Jambi, Indonesia. Thermoregulation data was obtained using RGB images videos, while values were measured from (R-JPEG) extracted into TIFF equipped with pixel temperature. detected visual mechanism known as mud bathing. Our study demonstrated that trunk functions draw throw it onto head, back, stomach, tail distribute all parts back body, ears flapped keep head cool. measurements showed is between 28.9-30.3°C. The had relatively lower than other body parts. This revealed humidity variable significantly affects elephant's rise. use future recommended accurately provides high quality can be widely used any type terrain.

Language: Английский

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Przewalski’s Horses (Equus ferus przewalskii) Responses to Unmanned Aerial Vehicles Flights under Semireserve Conditions: Conservation Implication

International Journal of Zoology, Journal Year: 2021, Volume and Issue: 2021, P. 1 - 6

Published: Aug. 27, 2021

Recent technological innovations have led to an upsurge in the availability of unmanned aerial vehicles (also known as drones and hereafter referred UAVs)—aircraft remotely operated from ground—which are increasingly popular tools for ecological research, question this study concerns extent which wildlife responses might allow monitoring (AWM) by UAVs. Our experiment tests hypothesis that wildlife-UAVs interaction depends strongly on flight altitude there may be a lowest range ungulates not exceedingly disturbed, dictating practically achievable level discernibility observation, influence future viability UAVs protection other China’s semiarid ecosystem. We examined behavioral group enclosed Przewalski’s horses (Equus ferus przewalskii) presence different in-flight models conducting flights at altitudes ranging 1 52 meters recorded heights each horse reacted (noticed fled) All exhibited stress response evidenced running away. The results suggest strong correlations between across subjects adults generally noticed larger (20.58 ± 10.46 m) than immature (4.67 0.87 m). Meanwhile, reaction females (15.85 6.01 smaller males (26.85 18.52 Supported their biological roles herds (e.g., must give his entire herd while purely responsible offspring), our also show age, closely followed gender, two most significant elements determine horse’s alertness This research will help scientists better gauge appropriate height use drone animal observation order minimize disturbance best preserve natural behavior.

Language: Английский

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How many macropods?A manager’s guide to small‐scale population surveys of kangaroos and wallabies

Ecological Management & Restoration, Journal Year: 2021, Volume and Issue: 22(S1), P. 75 - 89

Published: Nov. 1, 2021

Summary Every macropod population is unique in terms of the combination species, site and management goals, so there no universal ‘best’ method for surveying populations. We distinguish between different measures abundance confidence a manager can place them. examine separate components survey methods: platform, mode detection form sampling. also review range current methods available highlight new developments, including their assumptions limitations. To guide managers choosing context, we provide decision matrix based on behavioural ecology target structure habitat at porosity boundary. promote best practice, describe detail four standard counting direct count, sweep faecal accumulation rate distance

Language: Английский

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