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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:
- By Matching Line - opens the dialog, where you can select a common line on the background image and in the current job to transform the pixel coordinates of the background to the job's current coordinate system. This way is equal to localization in the horizontal plane using 2 pairs of points;
- By Matching Point - opens the dialog where you can select a common point on the background image and in the current job to transform the pixel coordinates of the background image to the job's current coordinate system. In this dialog you can enter rotate and scale values for the background. This way is equal to grid-to-ground transformation in the horizontal plane with origin point and non-zero rotation angle.
- By Plotting Scale - opens the dialog, where you can select a current job's point as origin point for background image rotation. In this case the application will rotate the background relatively to the top left point of the background image.
Image Transformation By Matching Line
For the transformation, the application performs the following operations:
- rotates the image around an origin point, the rotation angle is an azimuth of the job's line;
- scales the image; the scale factor is calculated as ratio of line length of the job to line length on the image.
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.
- Click
in the Line Length field of the Image panel to display the selected background image.
- Click and activate the start point button
then click on a background image to select the start point of the line. The start point of the line is used as the origin point of the transformation. - Click and activate the end point button
then click on a background image to select the end point of the line. - Click
to save the selection. The dialog displaying the selected background image is closed and the Line Length field displays the length of the selected line.
- In the Job Data panel, specify the start and end points of job's line:
- Start Point. The start point of the line is used as the origin point of the transformation. You can select the start point 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). - The end point can be set in the same way: by selecting from the map, from the list of job points, and by measuring its coordinates. Alternatively, the end point can be also specified by clicking the switchable End Point button and choosing and entering Line Length and Azimuth values.
- 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:
- rotates the image around an origin point, the user can specify the rotation angle;
- scales the image; the user can specify the scale factor.
In this dialog you need to select an origin point and specify rotation angle and scale factor:
- 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".
- 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).
- In the Rotation field enter the value of the rotation angle.
- In the Scale Factor specify the value of Scale factor. The value should be greater than 0.
- 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:
- rotates the image around an origin point, the user can specify the rotation angle;
- scales the image; the user can specify the scale factor.
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:
- 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.
- In the Rotation field enter the value of the rotation angle.
- In the Scale Factor specify the value of Scale factor. The value should be greater than 0.
- 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.
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