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- SourceAvailable from: Daan Swart[Show abstract] [Hide abstract]
ABSTRACT: 6) Norwegian Institute for Air Research, Kjeller, Norway, firstname.lastname@example.org (7) Institute of Applied Physics, Bern, Switzerland, email@example.com (8) Deutscher Wetterdienst, Hohenpeissenberg, Germany, Hans.Claude@dwd.de (9) Central Aerological Observatory, Moscow, Russia, firstname.lastname@example.org (10) Alfred Wegener Institute for Polar and Marine Research, (16) Institute of Meteorology and Water Management, Warsaw, Poland, email@example.com (17) ESA-ESRIN, Via Galileo Galilei, I-00044 Frascati, Italy, Rob.Koopman@esa.int (18) Belgian Inst. for Space Aeronomy (BIRA), Avenue Circulaire 3, Bruxelles, Belgium, firstname.lastname@example.org (19) Jet Propulsion Laboratory, Wrightwood (CA), USA (22) Royal Meteorological Institute (RMI), Ringlaan 3, Brussels B-1180, Belgium, email@example.com (23) Meteo Swiss, Payerne, Switzerland, firstname.lastname@example.org (24 ABSTRACT One of the nine instruments on-board the polar-orbiting environmental satellite ENVISAT is the Global Ozone Monitoring by Occultation of Stars (GOMOS) instrument. This paper presents validation results of GOMOS ozone profiles (v6.0a) from comparisons to microwave radiometer, balloon ozonesonde and lidar measurements worldwide. Thirty-one instruments/ launch-sites at twenty-five stations ranging from the Arctic to the Antarctic joined in this activity. We identified 3,713 useful collocated observations that were performed within an 800-km radius and a maximum 20-hours time difference of a satellite observation, for the period June 2002 and March 2003. These collocated profiles were compared and the results were analyzed for possible dependencies on several geophysical (e.g., latitude) and GOMOS observational (e.g., star characteristics) parameters. In a dark atmospheric limb the GOMOS data agree very well with the correlative data and between 20-to 61-km altitude their differences only show a small (2.5%) insignificant negative bias with a standard deviation of about 14%. This conclusion is demonstrated to be independent of the star temperature and magnitude, and the latitudinal region of the GOMOS observation.
Conference Paper: Design issues in distributed searching of multi-dimensional data[Show abstract] [Hide abstract]
ABSTRACT: In this paper we discuss some design issues concerning a semi-dynamic data structure for searching in multi-dimensional point sets in distributed environments. The data structure is based on an extension of k-d trees and supports exact, partial, and range search queries. We assume multicast is available in our distributed environment, but discuss how to use it only when needed and investigate, through a cost-model, the best strategy to deal with range queries.
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ABSTRACT: In the present study we investigated the role of spatial locative comprehension in learning and retrieving pathways when landmarks were available and when they were absent in a sample of typically developing 6- to 11-year-old children. Our results show that the more proficient children are in understanding spatial locatives the more they are able to learn pathways, retrieve them after a delay and represent them on a map when landmarks are present in the environment. These findings suggest that spatial language is crucial when individuals rely on sequences of landmarks to drive their navigation towards a given goal but that it is not involved when navigational representations based on the geometrical shape of the environment or the coding of body movements are sufficient for memorizing and recalling short pathways.
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