[中考化学]（人教版）2010年化学（精品课件）九年级（下）第9单元溶液 课题3溶质的质量分数 第1课时溶质的质量分数.ppt

堕查堡三些查兰三堡堡圭兰堡鎏圣
Abstract
GPS,with the merit of high orientation precision、high speed、simple and convenient manipulation etc,gets the rapid and widespread application in the survey domain,especially in highway has the great tendency in substitution of Levels and Geodetic Measurement Instruments:GPS plane relative orientation precision has already achieved higher which is difficult pare with conventional plan the GPS elevation orientation ha not sufficient accuracy,which seriously affected the development of the GPS three—dimensional orientation precision,and caused the superior performance provided by the three dimensional coordinate Can not obtain the full indicates that there are mainly two aspects affects the GPS
elevation measuring accuracy:(1)The ionosphere and the troposphere seriously
affects the GPS survey localization to the GPS signal refraction the ponent is under a more tremendous influence.(2)Resembled the regional charisteristics greatly level plane the precision influence,the GPS survey greatly
high in to the normal high switching process in,the precision is under a more
tremendous influence.
Actually,resemble greatly level plane is an irregular curved surface,it is unable to simulate with precise curved surface,therefore,it is not precise
mathematleal model and transformation formala of the transformation from
follow:
First,according to known control point(these control points simultaneously had the GPS elevation and standard elevation)in the distribute area to greatly resembles level plane,it specifically includes 5 kinds of fitting forms: transects curve fitting curve fitting fitting curved surface fitting —surface function curved surface
firing.
Second,in order to make the putations more convenient,a set of GPS elevation fitting procedures is developed based on the five fitting methods. The application of the fitting methods make the G