By Ute Christina Herzfeld
Although it really is mostly understood that the Antarctic Ice Sheet performs a severe position within the altering worldwide approach, so far there's a normal loss of available info at the topic. The Atlas of Antarctica is the 1st atlas at the 7th continent to be released in twenty years. It comprises a hundred forty five exact topographic and elevation maps derived from satellite tv for pc facts (GEOSAT and ERS-1 radar altimeter data), that are the simplest in their variety to be had at the present time. each one map is observed by means of an outline of geographic and glaciological features.
The introductory chapters familiarise the reader with the area of the Antarctic Ice Sheet and its function within the worldwide approach, in addition to discussing satellite tv for pc distant sensing and geo-statistical equipment at textbook point. purposes comprise distinctive nearby experiences of 15 outlet glaciers of the inland ice, a few of that are at present altering speedily. combos with SAR information facilitate the examine of floor buildings and circulate features.
Despite its state of the art clinical accuracy, the Atlas of Antarctica isn't just meant to be used via researchers and scholars in glaciology, geophysics, distant sensing, cartography and Antarctic examine, but in addition informative and stress-free for any reader attracted to the 7th continent. The Atlas is followed by means of a CD-ROM containing the entire atlas maps and elevation types – permitting the reader to find a wealth of interesting information in Antarctica!
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Extra resources for Atlas of Antarctica: Topographic Maps from Geostatistical Analysis of Satellite Radar Altimeter Data
Over large areas in the interior of the Antarctic continent, the slope is fairly small (and thus processing is easier and more similar to those of ocean returns), but the areas that are of greatest interest in the study of changes in the ice sheets are the margins of the continent — it is here that outlet glaciers ﬂow into ice shelves, calve into the ocean, and that most changes occur. The gradient is largest and most variable in the marginal areas of Antarctica. Consequently, the value of mapping methods increases with their ability to handle processing of data collected over complex terrain.
The science and technology of precision orbit determination has advanced considerably with the development of satellites. At time of SEASAT launch in 1978, the orbit error was about 5 m (Lerch et al. 1982), errors were at about 1 m in the early 1980’s (Schutz et al. 2-1). More information on orbit determination is given in Chelton et al. (2001, p. 64-86). Brieﬂy, orbit determination involves calculation of the satellite in motion, eﬀects of gravitational forces, geographically correlated errors, eﬀects of the geodetical reference frames used, forces of atmospheric drag and solar and terrestrial pressure.
4)). Atmospheric attenuation. Atmospheric attenuation (lack of transmittance of the signal) depends on latitude: The transmission is better over the polar latitudes than over the tropical latitudes, because the thickness of the troposhere is 18 km over the tropics, 10 km at mid-latitude, and least over the poles, and moisture is highest in the tropics also. 31 Ghz (Chelton et al. 2001, p. 7). In addition, the footprint should be small enough that homogeneity of roughness characteristics of the surface inside the footprint may be assumed in order to simplify integration in the radar equation (see eqn.