The Referencing Method applied to Airborne Scanner data

A range of brightness surfaces and test results are included in the following scanned image that were acquired using the Daedalus on 24.08.94.

Figure 6: Bands 1, 2, 3, 4 and 5 of Daedalus run 3 collected on 24.08.94 showing combined BRDF and Instrument contribution.

Figure 7: Brightness surfaces for bands 1, 2, 3, 4 and 5 of Daedalus run 3 modelled with Landsat TM imagery acquired on 24.08.94.

Figure 8: Bands 6, 7, 8, 9 and 10 of Daedalus run 3 collected on 23.08.94 showing combined BRDF and Instrument contribution.

Figure 9: Brightness surfaces for bands 6, 7, 8, 9 and 10 of Daedalus run 3 modelled using Landsat TM imagery acquired on 24.08.94.

Figure 10 has been included to show a subset of the mosaic of 3 flightlines (one of which was shown in full in Figures 6 and 8) highlighting the scene brightness variation. This variation is a scan angle-dependent brightness effect as well as a documented instrument induced brightness variation on the left and middle images. The image on the right shows the three runs after removal of the brightness surface. This supports the assumption that some additive instrument-related problems may also be solved using the Referencing Method. The following four images in Figure 11 show the correction to a seamless mosaic of the Daedalus data using different band combinations, NDVI and a vegetation classification that was validated over the entire mosaic.

Figure 10: LEFT: Raw Daedalus band 10 from 3 flightlines, the overlap order is flightline 2,3,4. MIDDLE: Raw Daedalus band 10 from 3 flightlines. The overlap order is flightline 3,4,2. RIGHT: Corrected band 10 from 3 flightlines.

Figure 11: (a) Band 7 (760-900 nm) in red, band 5 (630-690 nm) in green and band 3 (520-600 nm) (b) Bands 10 (2080 - 2350 nm), 9 (1550 - 1750 nm) and 3 (520 - 600 nm). (c) NDVI from band 7 (760-800 nm) and band 5 (630-690 nm). (d) Vegetation Classification.