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Related Concept Videos

Temperature Measurement Sites01:14

Temperature Measurement Sites

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A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...
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Electronic Distance Measuring Instruments01:30

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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over...
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Distance Corrections01:15

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To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
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Using a Thermal Camera to Measure Heat Loss Through Bird Feather Coats
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Distance makes the difference in thermography for ecological studies.

E Faye1, O Dangles2, S Pincebourde3

  • 1UMR EGCE, IRD-247 CNRS-UP Sud-9191, 91198 Gif-sur-Yvette cedex, France; Sorbonne Universités, UPMC Univ Paris 06, IFD, 4 Place Jussieu, 75252 Paris cedex 05, France; Pontifica Universidad Católica del Ecuador, Facultad de Ciencias Exactas y Naturales, Quito, Ecuador.

Journal of Thermal Biology
|February 10, 2016
PubMed
Summary
This summary is machine-generated.

Infrared thermography for ecological studies is biased by camera distance. Surface temperature metrics rapidly decrease within 20m, leading to under-estimation and homogenization of thermal data, especially with solar radiation.

Keywords:
DistanceLeaf temperatureMicroclimateThermal biasThermography

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Area of Science:

  • Ecology
  • Remote Sensing
  • Thermal Imaging

Background:

  • Surface temperature is crucial for ecological processes.
  • Infrared thermography is a common tool for ecologists to assess habitat thermal heterogeneity.
  • The impact of camera distance on thermographic measurements is often overlooked.

Purpose of the Study:

  • To investigate the effect of varying distances (0.3–80m) on thermal metrics measured by infrared thermography.
  • To analyze how weather conditions and surface structural complexity influence distance-related biases.
  • To provide guidelines for minimizing inaccuracies in ecological thermography.

Main Methods:

  • Examined thermal metrics (mean temperature, standard deviation, patch richness, aggregation) at different distances.
  • Conducted measurements under various weather conditions and on surfaces with differing vegetation complexity.
  • Assessed the influence of solar radiation on measurement bias.

Main Results:

  • Camera distance significantly alters measured surface temperatures and thermal heterogeneity.
  • A non-linear relationship was observed, with rapid under-estimation of metrics within 20m, followed by a slower decrease up to 80m.
  • Solar radiation amplified distance-related biases, leading to homogenization of thermal patterns, particularly affecting warmer areas.

Conclusions:

  • Distance is a critical factor introducing bias in infrared thermography for ecological applications.
  • Atmospheric composition and pixel size effects contribute to temperature under-estimation with increasing distance.
  • Ecologists should carefully consider camera distance to ensure accurate thermal measurements in habitat assessments.