EQUI1: A GLOBAL GRID SYSTEM

摘要

Geophysical parameters derived from space-borne EarthObservation Systems are either assigned to discretepoints on a fixed Earth grid (e.g. regular lon/lat grid) orlocated on orbital point nodes with a customized arrangement,often in-line with the instrument’s measurementgeometry. The driving factors of the choice and structureof a spatial reference system (i.e. the grid) are typicallyspatial resolution, instrument geometry, measurementtechnique or application.In this study we propose a global grid system, the socalledEqui1 grid, and demonstrate its realization andstructure. An exemplary Equi1 grid with a base samplingdistance of 12.5 km is compared against two othergrids commonly used in the domain of remote sensing ofsoil moisture. The simple nearly-equidistant grid designmakes it interesting for a wide range of other geophysicalparameters as well.