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Correction of Low-altitude Thermal Images applied to estimating Soil Water Status

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/22084

Title: Correction of Low-altitude Thermal Images applied to estimating Soil Water Status
Authors: Sugiura, R. Browse this author
Noguchi, N. Browse this author →KAKEN DB
Ishii, K. Browse this author →KAKEN DB
Issue Date: Mar-2007
Publisher: Elsevier
Journal Title: Biosystems Engineering
Volume: 96
Issue: 3
Start Page: 301
End Page: 313
Publisher DOI: 10.1016/j.biosystemseng.2006.11.006
Abstract: A system based on a thermal camera was developed for monitoring soil water status. This study used a thermal camera to take images of a field from a low-altitude helicopter. Thermal infrared energy captured by cameras tends to include errors because of atmospheric effects. This means that the image must be corrected for atmospheric transmissivity. The transmissivity can be determined from the ambient temperature, the humidity and the distance between the target object and the sensor. A method for correcting the image was developed using a principle of thermal imaging. The imaging accuracy was improved by the correction method. Remote-sensing experiments using an unmanned helicopter were conducted at an agricultural field. The experimental field was a paddy field with uniform soil quality, and the images of bare soil in the field were obtained at 10 a.m. and 3 p.m. on the same day. The correlation between the thermal image temperature and soil water content was evaluated. The determination coefficient between water content and temperature at 10 a.m. was 0·69 and that at 3 p.m. was 0·64. The difference in temperature between the two images was examined. The determination coefficient between water content and temperature difference was 0·42. Finally, a map of ground surface water content was generated using the captured image obtained at 10 a.m. The thermal imagery was found to be useful in determining within-field variability in ground surface soil moisture status.
Relation: http://www.sciencedirect.com/science/journal/15375110
Type: article (author version)
URI: http://hdl.handle.net/2115/22084
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 野口 伸

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