Add known xy

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Add known xy

Add known xy

Add known xy command lets you enter a new Known xy tie point. Known xy tie points are entered based on points for which the x and y coordinates are known, for example, control points on the ground without (valid) elevation values. The coordinates can be defined by snapping to vector elements drawn into the design file or by typing a key-in command in the MicroStation key-in line.

To enter a new known xy point:

1. Select Add known xy command from the Point pulldown menu.

The Tie Add Known Xy dialog opens:

tie_add_known_xy

2. Define a Number for the new point. By default, the number increments automatically.

3. Enter the position of the known xy point with a data click in a MicroStation view. You may snap to a vector element drawn in the design file in order to get the exact coordinates of the known point.

Alternatively, you can type a key-in command with the exact coordinates:

xy=212457.65,670960.11

The application adds the point to the list of tie points. All tie point pixels are undefined at this stage.

The application updates the Active detail view in order to show the known point location.

4. Enter the tie point position with a data click in the Active detail view.

The software computes and displays the mismatch between the tie point and the known point coordinates. It selects the next image with an undefined tie point pixel in the list and updates the Secondary detail view in order to show the tie line position.

5. Enter the tie point position with a data click in the Secondary detail view.

The software computes and displays the mismatch between the tie point and the known point coordinates. It selects the next image with an undefined tie point pixel in the list and updates the Secondary detail view in order to show the tie point position.

6. Continue with step 5 until all tie point pixels are defined.

7. After entering the last pixel of a tie point, you can continue with step 3 if you want to place the next Known xy tie point.

If the tie point position can not be defined in one of the secondary images, you should select the next undefined pixel for this tie point and continue entering the tie point pixels. Use the Clean command from the Point pulldown menu in order to remove undefined pixels from a selected tie point.