GPS SURVEYING RTK S82
Calculate conversion parameter
The control point library is used to calculate the conversion parameter. We use two known points coordinates (point a and point b) to calculate the conversion parameter, firstly we must note down the original coordinates of these two points, which are obtained by the rover in the fixed status without any conversion parameter. Input the know coordinate of point A in the control point library, and then enter the original coordinate of point a according to the prompt. The conersion parameter will be calculated after entering the known coordinate and original coordinate of point b. Click set coordinate lib to opern the control point library. Add, delete and edit buttons are the relevant operation to the know coordinates and original coordinates of known points. The button on/off is the oprtion of place calculation or altitude calculation. Oper button is to open an exist conversion file. Save button is to save a file of conversion parameter. Click add to input known coordinate and original coordinates of known points. You can input coordinate directly or click to select the coordinates from coordinate lib.Thesoftware will guide to continue step by step. Int he above dialog box, you can click add to ad known point coordinate or click import to open the file which the known point’s coordinate is in. After inputting the known coordinate of a point, the software will guide you to input its original coordinate we choose add from cor library.
Note: int he above figure there are four methods to input the original coordinates First, add the coordinates from coordinate library. Second, read the coordinates of the current position (to save an original coordinates when the rover keep centered and leveled) Third, read the coordinates fo base station (to read the original coordinate when the base station is on the know point) Fouth, input the geodetic coordinates. We reccomend the first method. Now we get back to coordinate lib again, you need to click inport to open the file, which the known point’s original coordinate is in. The icon represent original coordinate.
Note: in general plane conversion needs two points at least, and the altitude fitting needs three point s at least. IF a Benchmark has no plane coordinates, you need to get this point’s coordinate first and change the altitude surveyed to the known altitude. Before saving the file, you’ d better check wheter the plane accuracy and altitude accurcay meet the requirement.
