System 1984, and units of decimal degrees. GeoJSON uses a geographic coordinate reference system, World Geodetic Geographic features, their properties, and their spatial extents. The manner in which they are combined to represent data about It defines several types of JSON objects and GeoJSON is a geospatial data interchange format based on JavaScript Retrieved 25 January 2006.RFC 7946: The GeoJSON Format Įrrata Exist Internet Engineering Task Force (IETF) H. JetStream, the National Weather Service Online Weather School. of Environmental Medicine Thermal and Mountain Medicine Division Technical Report. Medical Problems in High Mountain Environments. International Society for Mountain Medicine. Exosphere - Thermopause to 10,000 km /6200 miles.Thermosphere - Mesopause to 675 km / 420 miles.Mesosphere - Stratopause to 85 km /53 miles.Stratosphere - Tropopause to 50 km /31 miles.Troposphere - surface to 8000 m / 5 miles at poles – 18,000 m / 11 miles at Equator, ending at the Tropopause.The Earth's atmosphere is divided into several altitude regions: These conditions are caused by the profound hypoxia associated with travel to high altitudes. Travel to high altitudes can lead to medical problems, from the mild symptoms of acute mountain sickness to the potentially fatal high altitude pulmonary oedema (HAPE) and high altitude cerebral oedema (HACE). Mountain medicine recognizes three altitude regions: Density altitude - altitude in terms of the density of the airĪlthough the term altitude is commonly used to mean the height above sea level of a location, in Geography the term Elevation is often preferred for this usage.Pressure altitude - altitude in terms of the air pressure.Height - altitude in terms of the distance above a certain point.True altitude - altitude in terms of elevation above sea level.Absolute altitude - altitude in terms of the distance above the ground directly below it.Indicated altitude - what the altimeter says.These types of altitude can be explained more simply as various ways of measuring the altitude: On a very hot day, density altitude at an airport (especially one at a high elevation) may be so high as to preclude takeoff, particularly for helicopters or a heavily loaded aircraft. Aircraft performance depends on density altitude, which is affected by barometric pressure, humidity and temperature.
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