NASA Technical Reports Server (NTRS) 19820024943: Software for the grouped optimal aggregation technique

by: NASA Technical Reports Server (NTRS)

Publication date: 1982-02-01

Topics: NASA Technical Reports Server (NTRS), CROP GROWTH, CROP IDENTIFICATION, CROP INVENTORIES, USER MANUALS (COMPUTER PROGRAMS), AGRISTARS PROJECT, EARTH RESOURCES PROGRAM, ERROR ANALYSIS, INPUT/OUTPUT ROUTINES, PREDICTION ANALYSIS TECHNIQUES, SUBROUTINES, Brown, P. M., Shaw, G. W. [Principal Investigator],

Collection: NASA_NTRS_Archive; additional_collections

Language: English

The grouped optimal aggregation technique produces minimum variance, unbiased estimates of acreage and production for countries, zones (states), or any designated collection of acreage strata. It uses yield predictions, historical acreage information, and direct acreage estimate from satellite data. The acreage strata are grouped in such a way that the ratio model over historical acreage provides a smaller variance than if the model were applied to each individual stratum. An optimal weighting matrix based on historical acreages, provides the link between incomplete direct acreage estimates and the total, current acreage estimate.