Coordinate transformations and processing of total station observations
The topography module can be installed over standard or professional MDT, and is very useful for processing total station observations, calculating point coordinates, compensating traverses and networks, etc.
It also allows to perform global and local coordinate transformations. The EPSG database is included with global coverage of reference systems, organized by countries.
The topography module allows the importing of files from total stations and the most usual data collectors on the market. Data can also be entered manually in tachymeter, theodolite, distance meter or total station mode which can be defined by the user, selecting the horizontal or geometric distance, vertical angle or change in level etc.
Based on this information, the program provides all the tools required for the processing, calculation and drawing of stations and topographic points. Stations calculation can be carried out by radiation procedures, inverse bisection, direct and inverse intersections and levelling.
The program compensates the mean distances and slopes in the calculation of points and stations. Optionally, corrections may be considered by refraction and sphericity, reduction to ellipsoid and combined scale factor.
It also includes the automatic correction of disorientations of mutual observations and instrument angular errors in direct-inverse circle observations. Finally, for these calculations to be more precise, a table is included with the precisions and characteristics of the most usual instruments.
MDT includes the compensation of networks and traverses (closed, open and tied to one or more fixed points) by Least Squares, proportional to the distances, coordinates' increases, Crandall rule or rotation and dilation.
The program allows the configuration of admissible errors and for calculation methods which use Least Squares, the tests can be activated which assess the reliability of the observations and of the adjustment made.
The program includes the EPSG data base which incorporates hundreds of coordinates' systems and vertical and geodesic datum transformations from all around the world, including an adaptation to the Geocentric Reference System for the Americas (SIRGAS). This data is used by the mapping projections library PROJ.4 to carry out conversions of coordinates between the different systems. The coordinates' units may be meters, miles, American feet etc. The most usual systems can be selected from a list of favorites.
A powerful geodesic calculator allows the implementation of the most usual transformations and/or conversions between geographic, geocentric and projected systems.
Furthermore, this module includes options for converting projected coordinates' files into generic format X, Y, Z and geographic coordinates into KML formats from Google Earth, GPS exchange Format (GPX) and W84 from TcpGPS.
Finally, another command allows the projection of drawings opened in CAD, applying the transformations to the complete drawing, a list of layers or a selection of objects and being able to decide whether the elevations will be included in the calculations.
The selected transformation applies to all drawing entities (vertices of lines, arcs and polylines, text insertion points and blocks etc.).
It is also endowed with specific options for transforming a flat and projected coordinates' drawing and vice versa.
This module also has options for local coordinate systems application and management with the following methods being available:
To create a local coordinate system there are various possibilities: enter the value of the transformation parameters directly (rotations, translations etc.), establish the pairs of source and target points involved or by importing a predefined file. The program generates a detailed report in which the parameters calculated, various statistics and the coordinates of the checkpoints involved are provided.
Once the local system has been created, recording can be carried out to subsequently carry out transformations of drawings and files of coordinates and it may also be used in the TcpGPS application for mobile devices.
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