FRM4ALT

To establish a continuous, homogenous and reliable monitoring of the ocean and its changes, altimetry observations have to be free of errors and biases, uninterrupted, but also tied from one mission to the next in an objective and absolute sense. Altimetry system's responses have to be, thus, continuously monitored and controlled for their quality, biases, errors, drifts, although relations among different missions have to be established on a common and reliable earth-centered reference system, maintained over a long period of time... FRM4ALT Fiducial Reference Measurements for Altimetry