Improved Gravimetric Terrain Corrections

SECOND” Digital Elevation Model of Australia, and their effects on gravimetric terrain corrections

Large gradients, when calculated by a first-difference method, have been detected in the 9 arc-second National Digital Elevation Model (DEM) of Australia released by the Australian Surveying and Land Information Group. Gradient values implied by the mean elevations in the DEM between adjacent grid cells of up to 74° have been observed, most notably in Australia’s more mountainous regions in the...

A Simple Gravimetric Method to Determine Barometer Corrections

Presented here is a gravimetric me thod to calibr a te barometers. The difference in forces exerted on th e pan of a balance is observed for tw o we ll charac terized artifac ts of nearly equ al masses but different volumes. During the weighing, air tempera ture and re lative humidity ar e meas ured; the ambient pressur e is then calculated from an a ir density equation. A barometer correc tion...

Atmospheric Corrections to Satellite Radiometrie Data over Rugged Terrain

Radlometnc measurements from satelhtes m the solar portmn of the electromagnetic spectrum can be converted to measurements of surface eratance Over rugged terrain, the satelhte image must be precisely registered to a terrain data set For small areas a first-order polynomial mterpolatmn scheme is generally satisfactory for the geometric rectlficatmn If there are saturated plxels, a nearest-neigh...

Improved Rover State Estimation in Challenging Terrain

Given ambitious mission objectives and long delay times between command-uplink/datadownlink sessions, increased autonomy is required for planetary rovers. Speci cally NASA's planned 2003 and 2005 Mars rover missions must incorporate increased autonomy if their desired mission goals are to be realized. Increased autonomy, including autonomous path planning and navigation to user designated goals...

Spatial Multi-resolution Terrain Rendering Based on the Improved Strategy for Terrain Dispatching and Pre-reading