Leica TPS1200 System Field Manual

18.4 TPS CorrectionsDescriptionAccessCONFIGURETPS Corrections,AtmosPPM pageThe settings on this screen define the atmospheric ppm, the geometric ppm and therefraction. The geometric ppm can also be determined by a resection calculation.For standard application programs the distance is corrected on account of atmosphericinfluences. The geometrical correction and the projection distortions are setto 0.00. Heights are reduced with the standard refraction coefficient.Select Main Menu: Config...\Instrument Settings...\TPS Corrections.CONT (F1)To accept changes and return toTPS1200+ Main Menu.PE (F3)To change to and back.%T ’ (F4)To change to and back.PPM=0 (F5)To set .Description of fieldsField Option Description User input Sets the temperature. or orUser inputUser inputUser input orOutputSets the atmospheric pressure or theelevation above mean sea leveldependent on selection.Sets the relative air humidity or the wetbulb temperature dependent on selection.The atmospheric ppm is either set orcalculated from the above values.Next stepPAGE (F6) changes to the GeomPPM page.CONFIGURETPS Corrections,GeomPPM page• The geometric distance correction (geometric ppm) is derived from the mapprojection distortion (map projection ppm), the height above reference datumcorrection (height ppm) and an individual correction (individual ppm).• The calculation of the map projection ppm follows the formula for the TransversalMercator Projection. The individual factors are: the scale factor of the lineof projection central meridian, Gauss-Krüger = 1.0, UTM = 0.9996, etc. and theoffset from the line of projection.• The calculation of the height ppm is derived from the height of the instrumentstation above the reference datum. Normally this is the height above mean sealevel MSL.106 TPS1200+ Config...\Instrument Settings...