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I know it's been a long time and you probably no longer care for the answer, but in case you (or someone coming in from a web search) cares, I'll attempt an answer. To quote some text from the NMEA 0183 (unofficial reference at http://www.catb.org/gpsd/NMEA.txt, in case the official one disappears) specification, The numbers 65-96 are reserved for ...


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Commercial satellite imagery can be purchased either from archives or ordered as tasking for anywhere in the world through DigitalGlobe/GeoEye who have recently combined their constellation of satellites. Imagery is usually at 50cm or 60cm. You can actually get 8 band imagery in many cases, which would allow more specific classification. They even have ...


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The US Government GPS Standard Positioning Service Performance Standard, appendix A, guarantees coverage up to an altitude of 3000km. Accuracy of a standard receiver would in no way be reduced at high altitude. High velocity is a bit different - the increase dopplar shift requires a receiver to search a large frequency range in order to lock on to the ...



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