Potential of the Incidence Angle Effect on the Radiometric Calibration of Full-Waveform Airborne Laser Scanning in Urban Areas
Issue:
Volume 1, Issue 4, August 2013
Pages:
77-87
Received:
1 July 2013
Published:
10 August 2013
Abstract: Full-waveform airborne laser scanning has shown potential to better describe land cover features through the additional physical information it can provide alongside the standard geometric information. To fully utilize full-waveform for enhanced object recognition and feature extraction, it is essential to calibrate the backscattered energy of the received signal. The backscatter signal is affected by many variables during the travel between the sensor and the target. To eliminate these effects and deliver more reliable physical information for land cover features, the incidence angle effect was considered following the RSN method which was introduced in previous work. Following the radar equation, a comprehensive radiometric calibration routine was applied in this paper where the backscatter coefficient utilized to deliver the calibration constant. The calibrated results were achieved by means of backscatter cross-section and coefficient parameters in addition to the normalized parameters with respect to the incidence angle effect. The backscatter signals from overlapping flight lines were investigated and analyzed over various land cover types before and after calibration in the study site. Results show the potential of using the backscatter coefficient to deliver the calibration constant for the radiometric calibration purposes. It was also proven that the normalized backscatter coefficient with respect to incidence angle provides the greatest potential amongst the other backscatter parameters by delivering the optimal match between flight lines.
Abstract: Full-waveform airborne laser scanning has shown potential to better describe land cover features through the additional physical information it can provide alongside the standard geometric information. To fully utilize full-waveform for enhanced object recognition and feature extraction, it is essential to calibrate the backscattered energy of the ...
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Spatial Distribution of the Effect of Temperature &Rainfall on the Production of Bororice in Bangladesh
Md. Abu ZaferSiddik,
Abu Sufian Mohammad Asib,
Samrin Ahmed Kusum
Issue:
Volume 1, Issue 4, August 2013
Pages:
88-95
Received:
12 July 2013
Published:
20 August 2013
Abstract: Climate is one of the major controlling factors for the well-being of the residents in the world. Global climate has been changing due to natural forces as well as anthropogenic activities, especially for emissions of greenhouse gases, aerosols and land use changes in recent decades. Climatic factors such as temperature, rainfall, relative humidity, cloud coverage, wind speed, bright sunshine etc. are closely linked with agricultural production. This paper mainly focuses on the effect of rainfall & temperature on the production of Boro rice. Rice production has been a major concern in recent years due to changing climatic conditions because significant amount of rice yield may be hampered for fluctuations in those climatic parameters. This study is limited to assess the effect of climate change on production of Boro rice in Bangladesh. Boro cultivation is held on dry season (mostly November-April in Bangladesh). Geographic Information System (GIS) is a tool to show the spatial distribution of the effect of these climatic parameters on the production of Boro in Bangladesh. This effect is shown by normalization of Boro yield by temperature and rainfall.
Abstract: Climate is one of the major controlling factors for the well-being of the residents in the world. Global climate has been changing due to natural forces as well as anthropogenic activities, especially for emissions of greenhouse gases, aerosols and land use changes in recent decades. Climatic factors such as temperature, rainfall, relative humidity...
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