In-flight Radiometric Calibration of Digital Photogrammetric Camera using Multi-grayscale Artificial Targets

With features of digitalization, light weight, high spatial resolution, high detection precision, production of digital photogrammetry sensors are widely used in aviation remote sensing replacing the analog sensors. One of the most attractive features of digital cameras compared with analog cameras is the radiometric properties. To implement spectral and radiometric calibration for digital photogrammetric cameras, a set of artificial targets were built in a test field. The artificial targets reflectance annual attenuation was measured, the result demonstrated that attenuation is influenced by gray scale changes. In this paper, in-flight radiometric calibration of SWDC was carried out in reflectance-based vicarious calibration method in 2011. The linear correlation between the sensor response and targets reflectance is 90% above. The apparent radiance that is simulated by radiation transfer is compared with the radiance value that is retrieved with calibrated coefficients, the relative difference is superior to 8% and it is sensitive to GSD.