TY - GEN
T1 - Simulation of grassland-shrubland transition zone landscape images at 650 nm using a simple BRDF model
AU - Chopping, Mark J.
AU - Rango, Albert
AU - Goslee, Sarah
AU - Schmugge, Tom
AU - Ritchie, Jerry C.
PY - 2002
Y1 - 2002
N2 - The objective of this study was to assess the capability of a simple bidirectional reflectance distribution function (BRDF) model to simulate angular 650 nm (red wavelength) images of shrubland landscapes when driven by a small number of spatially-varying structural parameters (mean shrub density and width, together with derived mean canopy height and overall brightness), together with two static parameters (spectral reflectance of leaves and a parametric soil/understory BRDF). It was hypothesized that this simple parameterization will lead to important errors in reconstruction of directional (off-nadir) images, as acquired by a tilting multispectral digital camera at six different viewing directions and three different solar zenith angles in the principal plane. The results show that great care is needed in parameterizing the BRDF in this way and that variations in the brightness of the understory - here represented by grasses, forbs, subshrubs, biotic crusts and bare soil - has an important effect on modeled estimates of bidirectional reflectance in the red wavelengths.
AB - The objective of this study was to assess the capability of a simple bidirectional reflectance distribution function (BRDF) model to simulate angular 650 nm (red wavelength) images of shrubland landscapes when driven by a small number of spatially-varying structural parameters (mean shrub density and width, together with derived mean canopy height and overall brightness), together with two static parameters (spectral reflectance of leaves and a parametric soil/understory BRDF). It was hypothesized that this simple parameterization will lead to important errors in reconstruction of directional (off-nadir) images, as acquired by a tilting multispectral digital camera at six different viewing directions and three different solar zenith angles in the principal plane. The results show that great care is needed in parameterizing the BRDF in this way and that variations in the brightness of the understory - here represented by grasses, forbs, subshrubs, biotic crusts and bare soil - has an important effect on modeled estimates of bidirectional reflectance in the red wavelengths.
UR - https://www.scopus.com/pages/publications/0036402896
M3 - Conference contribution
AN - SCOPUS:0036402896
SN - 078037536X
T3 - International Geoscience and Remote Sensing Symposium (IGARSS)
SP - 3561
EP - 3563
BT - 2002 IEEE International Geoscience and Remote Sensing Symposium, 24th Canadian Symposium on Remote Sensing - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2002 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2002
Y2 - 24 June 2002 through 28 June 2002
ER -