Geocarto International · 1992 · 10 citations · 13 references
Natural ResourcesEcologyRange ManagementRangeland AssessmentRangeland MonitoringTerrestrial EcologyBiomass Resource AssessmentRange Condition AssessmentVegetation Change DetectionVegetation Cover AssessmentVegetation IndicesVegetation MonitoringArea CoverageGeospatial Range AssessmentHerbaceous Biomass EstimationHerbaceous Cover AssessmentNormalized Difference Vegetation Index MappingRadiometer CalibrationRemote Sensing Biomass EstimationWeighted Least Squares
Abstract Average integrated National Oceanic and Atmospheric Administration (NOAA) advanced very‐high resolution radiometer (AVHRR) local area coverage (LAC) normalized difference vegetation index (NDVI) was used to extrapolate ground truth herbaceous biomass estimates. Calibration of average integrated NDVI to herbaceous biomacs was via inverse predictions of NDVI regressed on herbaceous biomass linear regressions. Weighted least squares regression analysis were typically employed with R2 values ranging from 0.25 to 0.80. The herbaceous biomass average estimates of 200 and 1,000 kg/ha had a standard error of less than 200 kg/ha. A pastoral zone mask was developed and applied to obtain arrondissement (county) pastoral zone herbaceous biomass estimates. Total pastoral zone herbaceous biomass indicated that 1987 and 1990 were drought years and that 1986 and 1988 were favorable years for livestock and herders.
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