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...iously used on the Shuttle in 1994. To acquire [[Topography|topographic]] (elevation) data, the SRTM payload was outfitted with two radar antennas. One antenna The elevation models are arranged into tiles, each covering one [[degree (angle)|degree]] of lat ...

...''[[APRS]]''') is an [[amateur radio]]-based system for real time tactical digital communications of information of immediate value in the local area. In addi [[APRS]] ([[Automatic Packet Reporting System]]) is a digital communications protocol for exchanging information between a large number o ...