RADIOMETRIC CALIBRATION OF ALS INTENSITY

We have developed a new concept of empirical calibration scheme for airborne laser scanner (ALS) intensity by means of portable brightness calibration targets, which can be laid out in the flight target area. The accurate radiometric calibration of these targets is based on laboratory measurements with CCD-based laser backscatter instrument and terrestrial laser scanner reference measurements in laboratory and field conditions. We also discuss the extension of this method into the usage of commercially available industrial gravels or other (natural-type) targets available ad hoc. We demonstrate that airborne laser intensity calibration is feasible using this type of targets, but one must take carefully into account the physical parameters related to the experiment and the targets.

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