Background Image Transformation

Select the transformation type to convert the selected background images from the pixel coordinates to the job's current coordinate system. The coordinates transformation is performed in the horizontal plane only. MAGNET Field offers three transformation types:

Image Transformation By Matching Line

For the transformation, the application performs the following operations:

In this dialog you need to specify the start and end points of a line on the background image and start and end points of the same line in the current job.

  1. Click in the Line Length field of the Image panel to display the selected background image.
  2. In the Job Data panel, specify the start and end points of job's line:
  3. Click the Save button to save the calculated transformation parameters to ESRI World File. This file is saved in the background drawing folder. When transformation parameters are updated successfully, the Background Images dialog displays.
Image Transformation By Matching Point

For the transformation, the application performs the following operations:

In this dialog you need to select an origin point and specify rotation angle and scale factor:

  1. Click in the Select an Origin Point field of the Image panel to display the selected background image. Click and activate the button then click on a background image to select the required point. The selected point is used as the origin point of the transformation. Click to save the selection. The dialog displaying the selected background image is closed and the Select an Origin Point field displays "Point Selected".
  2. In the Origin Point field of the Job Data panel, specify a point in a current job. This point is used as the origin point of the transformation. You can select it from the map or from the list of the job points, or you can measure its coordinates by clicking (for GNSS device type) or (for optical device type).
  3. In the Rotation field enter the value of the rotation angle.
  4. In the Scale Factor specify the value of Scale factor. The value should be greater than 0.
  5. Click the Save button to save the calculated transformation parameters to ESRI World File. This file is saved in the background drawing folder. When transformation parameters are updated successfully, the Background Images dialog displays.
Image Transformation By Plotting Scale

For the transformation, the application performs the following operations:

In this dialog you need to select an origin point in the job and specify rotation angle and scale factor. By default, the origin point of the image is top left point of the background drawing:

  1. In the Origin Point specify the point in a current job to use it as the origin point for the transformation. You can select it from the map or from the list of the job points, or you can measure its coordinates by clicking (for GNSS device type) or (for optical device type). If you did not select an origin point from the job, the application will use a point with plane coordinates (0;0) as origin point.
  2. In the Rotation field enter the value of the rotation angle.
  3. In the Scale Factor specify the value of Scale factor. The value should be greater than 0.
  4. Click the Save button to save the calculated transformation parameters to ESRI World File. This file is saved in the background drawing folder. When transformation parameters are updated successfully, the Background Images dialog will be displayed.