2. Beyond Spectral and Spatial data: Exploring other domains of information: 2 GEOG3010 Remote Sensing and Image Processing Lewis RSU

3. Domains of Information spectral angular multi-temporal distance-resolved spatial

4. Directional Information spectral depends on illuminated/viewed amounts of material As change view / illumination angles, change these proportions –so change reflectance

5. Directional Information Describe directional reflectance by BRDF –Bidirectional Refelctance Distribution Function e.g. plot as function of view zenith angle:

6. Directional Information

7. Features of BRDF General upwards bowl shape for most biomes retro-reflectance peak (‘hot spot’)

8. Directional Information

9. Features of BRDF Bowl shape –increased scattering due to increased path length through canopy

10. Features of BRDF Bowl shape –increased scattering due to increased path length through canopy

12. Features of BRDF Hot Spot –mainly shadowing minimum –so reflectance higher

14. Features of BRDF Also orientation of leaves etc. –projection –quantify through eg leaf angle distribution

17. Use of directional information Discrimination / classification Green red nir swir

18. Use of directional information Parameterisation of surface conditions –build model of physics of effect of surface properties on reflectance –invert model against RS BRDF measurements