SPACER 1430542 - Caterpillar

File Format
The site calibration file must be available in the *.dc file format for use on all equipment on the site that has GNSS receivers including, but not limited to:
Autonomous equipment
Equipment equipped with Terrain
Vehicles with proximity awarenessConfiguration Management
Once the site calibration file is developed and distributed, a process must be established to ensure that all equipment on site is using a common file.Support Requirements
Site Positioning Support Personnel
Champion - A site positioning champion must be identified at each customer site. The champion should be made responsible to ensure the consistent operation of the site positioning equipment.Technician Support - Given the critical nature of the site positioning components, having technician support on site that can respond to any issues with the components during all working days and hours is important. Technician abilities must include the ability to troubleshoot issues and replace components as needed.Appendix
Introduction
GNSS provides geographic positions (latitude and longitude, together with ellipsoidal heights) that must be transformed and projected to be compatible with local mine coordinate systems. A GNSS "site calibration", or simply "site cal", provides the transformation parameters necessary to convert the GNSS positions to local positions. This document provides some basic information and guidelines that apply to Cat MineStar System installations and the selection of qualified third-party survey consultants.Definitions
Control Points (or Just "Control")
Physical points in the ground that are semi-permanent and assumed to never move, with known coordinates:1D Points - Have only known elevation and are frequently referred to as benchmarks.2D Coordinates - Have only Easting, Northing or x, y known.3D Coordinates - Have Easting, Northing, Elevation or x,y,z all known.In ideal cases, horizontal (x,y) control points are located near or beyond the perimeter of the mine and are located on at least three sides of the work areaVertical (z) control points are also evenly distributed around the site and should ideally cover the extreme heights or depths of the site.Site Calibration
Site Calibration has three distinct definitions:Field Survey - performed after base station is set up to occupy (survey) control points that exist around the mine.File Created From The Results Of The Field Survey - Latitude, longitude, and ellipsoid height (LLH) on each point, relative to the base station, come from the GNSS; projected grid positions (x, y or Easting, Northing), plus elevation (z) are known (come from previous survey and should be provided by the mine surveyor).Transformation Parameters that are Applied to GNSS positions ("WGS84") - Convert the parameters to the local mine coordinate system.*.dc ("DC") File
A file that is used to put on the site calibration parameters to a Cat Terrain system.Typical parameters in a site calibration "DC" file include:
Ellipsoid definition
Datum definition
Projection
Horizontal adjustment
Vertical adjustmentNote: For Cat MineStar System applications, the "DC" file must not contain a geoid model, should be created with no geoid model, and should include a vertical adjustment based on the designated survey control points.Note: A "DC" file may also have other data, such as list of control points, or results of field surveys (for example, topographic data), or even road designs.