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Conventions
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Some conventions that have been implemented:

	* Attribute names are all lower case and word separated by '_'
	* All times are UTC, other time zones are supported but strongly discouraged.
	* Units should be in SI and when a name is required should be all lower case and spelled out, for example 'nanotesla' or 'millivolts per kilometer'
	* All azimuth angles should be relative to geographic north and measured positive clockwise in a right-handed coordinate system with z positive downwards.  
	* All angles should be in degrees
	* Locations are given in latitude and longitude in decimal degrees and should all use the same well known datum.  Default is WGS84.