 	The SRTM30 Plus dataset, a 30 arc-second seamless combination of GTOPO30, SRTM derived land elevation and UCSD Sandwell bathymetry data.  The default style is scaled to 8 bit, non-linear.  It is possible to request the elevation data in meters by the short_int tyle and requesting PNG format.  The resulting PNG file will be a unsigned 16 bit per pixel image. The values are then the elevation in meters.  Values are signed 16 bit integers, but PNG will present them as unsigned, any values larger than 32767 should be interpreted as negative numbers.  For elevation values in feet, request PNG format with the style feet_short_int.       