PAI

I n t r o d u c t i o n

The PAI tools allow MicroStation users to migrate their asset data from old (pre-PAI) maps to new (post-PAI) maps. The Ordnance Survey have more information about Positional Accuracy Improvement.

See also 2006-10-03

W h a t D o e s I t D o ?

1) The PAI Tool displays the old map and the new map side by side in two views. image external:http://www.dhp11.com/site04/product/pai/images/pai01.jpg?

2) The operator identifies common points on the old and new map. image external:http://www.dhp11.com/site04/product/pai/images/pai02.jpg?

3) The operator adds link points until the assets are located correctly.

In more complex areas the assets move dynamically so the operator can see the effect of placing the link point.

I n s t a l l a t i o n

See the readme file.

U s i n g T h e T o o l s

Choose the 'Open Map Tile' option from the 'Positional Accuracy' menu.

Type in the name of the tile you want to edit and press 'Open'.

The tile is opened in two views. The left hand view shows the old map and old assets. The right hand view shows the new map and the assets in their new postions. Assets that have not been moved are shown 'greyed-out'.

Most of the PAI tools are shown in the dockable menu bar.

From left to right the tools are: Undo/Redo - A multi-level undo/redo that allows you to place link points to see their effect without worrying that you will 'mess up' the file. Add Link Point - This is the most used command. Click on this button and then place a link point in the left hand view (old). Identify the same point in the right hand view (new). The tools adjust the position of nearby assets automatically.

Delete Link Point - If you have placed a link point in the wrong place, click on this button and then click on the link point you want to delete. You can delete link points from the left or right views.

Move Link Point - Use this tool to adjust the location of a link point in the right view only. 'One Shot' - You can add link points in two different ways. If 'one shot' is on, you place a link point in the left view and then place its partner in the right view. i.e. You alternate between the left and right views.

If 'one shot' is off, you place any number of link points in the left view and then click 'reset' to place all the corresponding partners in the right view. Snap to Map - If snap to map is on, when the cursor is 'close' to a snappable point the link point sysmbol is automatically snapped to that location.

Use Reference Point - When this is on, the link point is placed as an offset to a known point. In the example below the yellow cable in the left view is known to be 2.08m from the corner of the building. With 'Use Reference Point' on we are able to click on the corner of the building and place the link point at the same bearing and distance from the corner in both views.

Click on the corner of the building and then on the cable. When we click on the corner of the building the linkpoint is automatically placed at the correct distance and angle.

Grey-out Plant - If this is on, when a link point is placed in the right hand view the assets are greyed-out to make it easier to see the effect of the linkpoint. This is particularly effective when combined with 'Dynamic Plant' (below).

Dynamic Plant - Turn this on to see dynamically what effect the link point will have as you move it around in the right view.

Dimension circles - Click on a line or piece of text to draw a circle with that radius in the right view. These are useful if there a are dimensions in the old design files that could be re-used to place assets very accurately.

Completed Areas - To help the operator keep track of which areas they have completed this tool allows you to 'block out' parts of the left hand view.

D o w n l o a d

These versions of the software are free to download and use.