The enhanced vegetation index (EVI) was developed to optimise the vegetation signal, correcting reflected light distortions caused by particulate matter suspended in the air, as well as by influence of background data under the vegetation canopy (Justice et al. 1998).
With respect to deriving common vegetation indices from corrected reflectance data, the Normalized Difference Vegetation Index (NDVI) was associated with the smallest errors (3 8% MAD).
Based on these results, the original version of SRTM DEM, the ASTER GDEM along with vegetation smoothed and hydrologically corrected versions were prepared and used to simulate three flood events along a 200 km stretch of the low-gradient Thompson River, in arid Australia (using five metrics: peak discharge, peak height, travel time, terminal water storage and flood extent).
We found that AGB estimates for hardwood forests were strongly related to stand age and near-infrared reflectance (r2=0.95) while the AGB for pine forests was strongly related to the corrected normalized difference vegetation index (NDVIc; r2=0.86).
Roughness-element heights (mean, maximum and standard deviation) of both buildings and vegetation are combined with a porosity corrected plan area and drag formulation.
Habitat affinities should be taken as an index comparable among species rather than as an absolute measure of species' habitat preferences because sightings/km were not corrected for variability in detection probability among vegetation types.
Williams et al. [95] observed tracks and roads through dense vegetation in Papua New Guinea using X- and P-band terrain corrected magnitude data overlaid on digital elevation models (DEMs) derived from GeoSAR data.
Extending this, the soil-adjusted vegetation index (SAVI) (Huete 1988) was promoted as a modification to the NDVI, allowing a corrected assessment of the impact of soil on the reflectance characteristics of green vegetation in semi-arid regions.
The hydrologically corrected DEMs performed best across these metrics in simulating floods compared with vegetation smoothed DEMs and original DEMs.
The annual vegetation green-up date was calculated as the day of a study year when the corrected (anomalies caused by clouds, snow cover, orbital drifts and volcanic stratospheric aerosol) interpolated 1-day resolution NDVI crossed the threshold value.
