Surface reflectance mapping using interferometric spectral imagery from a remotely piloted aircraft

DASI characteristics: Compactness (pod is ~0.3m W x ~1.2m L), light weight, low power, rugged design, simplicity of operation Achieves spectral discrimination by 2-beam interference Spectral range: 0.45 to 0.80 m m Spectral resolution: ~250 cm-1 (10 nm at 0.65 m m) Cross-track FOV: 11 deg, 240 elements Surface spatial resolution: ~5 m typical Configured for remote operation Analysis: 20 regions were selected from DASI image of PMRF (Fig. 7). Comparisons of DASI and ground measurements were made near region 1, a concrete runway with uniform spectral properties. Surface albedos measured on ground (Fig. 5, 6) were transformed to effective DASI at-sensor radiance values using an atmospheric model (MODTRAN) together with radiosonde measurements. Comparison with DASI at-sensor radiance (adjusted with a spectrally independent multiplier) is shown in Fig. 8. This multiplier was applied to DASI laboratory calibration to compensate for radiance scale errors caused by in-flight malfunction of the adjustable entrance aperture. Surface reflectance values for all regions were derived from adjusted DASI at-sensor radiance measurements using the above model (Fig. 9). Fig. 3: False color image of PMRF from ARTIS/Kodak camera aboard Pathfinder. Near IR channel is rendered as red. Surface Reflectance Mapping using Interferometric Spectral Imagery from a Remotely Piloted Aircraft Philip D. Hammer, Lee F. Johnson, Anthony W. Strawa, Stephen E. Dunagan, Robert Higgins, James Brass, Robert E. Slye, Donald V. Sullivan, Brad M. Lobitz, William H. Smith, and David L. Peterson