Add projection points

Add projection points to Plot Plan images

You will need to place at least four points in the source image and the target image.

• Four (4) points in the source image and four points in the corresponding target image should be enough for most plot plans.

• By using OSM Administration to fine tune the X/Y coordinates and recalculating, then it should not usually be necessary to add more points. See Adjust Projection / Cross Section.

• Only in a very few situations will more than four points be needed.

Suggested order of placing points

When mapping points on source and destination images, place points in the following order:

• Start with left upper corner on source image, then find the corresponding position on target image.

• Next, place the point on left lower corner of source image, and mark the associated position on the target.

• Do the upper right corner on the source image and destination image.

• Lastly, place the point in lower right corner of source image and corresponding position on destination image.

  

See X Y coordinate system.

To add projection points

1. Add the first point to the source image (on left side) by positioning mouse cursor over plot plan and clicking right mouse button.

2. Then, find the corresponding point in the destination image (on right side) and click again with right mouse button.

   When you add the destination point, both points will show in red on both plans.

   

3. Continue to add points to the source image and destination image until you have four points on each image.

   

Fine tune the placement of the points

You can delete a point and replace it to get the correct location, or you can use the OSM Administration interface to manipulate the X,Y values. See Adjust Projection / Cross Section.

After mapping points

After mapping the coordinates between source and destination image, do the following:

4. Close the Image mapping window and reopen it. Do not calculate yet.

5. Open OSM Administration and find the plot plan and fine tune the coordinates. See Adjust Projection / Cross Section.

   You can keep both software applications open side-by-side while fine tuning the X/Y coordinates. Remember that it is possible to zoom in the Image Calibration Tool.

6. When fine tuning is finished, close the Image mapping window and then reopen it.

7. Calculate and save in the Image tool.

8. Close the Image tool window and reopen.

9. Test the movement of the green dot to see if it behaves as it should.

Cross-section points

When looking from the side-view at a cross-section, some points will appear to be in the same position. However, they cannot be in exactly the same position. There must be a difference of at least 1 pixel.

Zoom

You can change the zoom level of either image with the mouse scroll button.

Next step