The Finding Elevation with Geographic and UTM Coordinate

Abstract

The Finding Elevation with Geographic and UTM Coordinate was prepared by Public Works Department Bangkok, with an elevation total of 879 point, in which the elevation point used the leveling methods and horizontal coordinate methods used GPS. The elevation point and horizontal coordinate are used to model grid elevation values, which consist of 49 rows 67 columns of grids, grid size 1000x1000 meters. Scope of UTM Bangkok lower left corner (N1495940.000,E643360.000) and upper right corner (N1543940.000,E709360.000) and Geographic lower left corner (133134.93312,1002146.656996) upper right corner (135736.778341,1005610.364321). An equation used to convert values between geographic coordinates and UTM coordinates are used to the equations of The Nation Geodetic Survey or Kruger or Snyder or Redfearn, the equations used to determine the level values, Bi-Linear, Bi-Quadratic and Bi-Cubic. Programs to process use AutoCAD Civil 3D and Microsoft Excel on sheets and programming by visual basic for applications. The test point for determined the level with geocoordinate and UTM coordinates uses the centroid of each district in Bangkok. The Finding Elevation with Geographic and UTM Coordinate. Level values can be found in all locations in Bangkok. By entering the Geographic coordinates or the UTM coordinates. Into the grid level model created. Level values derived from Geographic coordinates values and UTM coordinates values give average accuracy, Bi-Linear equation 0.0300.191 meters, Bi-Quadratic equation 0.0590.372 meters and Bi-Cubic equation 0.0650.392 meters.