The calibration options determine how the program will convert bitmap pixels (picture elements) to global map coordinates. Choose one of the methods:
- Min/Max Calibration: Expand this heading to specify the coordinates that represent the opposite corners of the image. This method assumes that the image is oriented exactly east/west & north/south.
- X-Min (West Edge): Click to type in the X (easting) coordinate to be represented along the west (left) edge of the image.
- Y-Min (South Edge): Click to type in the Y (northing) coordinate to be represented along the south (lower) edge of the image.
- X-Max (East Edge): Click to type in the X (easting) coordinate to be represented along the east (right) edge of the image.
- Y-Max (North Edge): Click to type in the Y (northing) coordinate to be represented along the north (upper) edge of the image.
- 3-Point Calibration: Identify any three points. This method will allow for some tilt relative to a perfectly east/west & north/south aligned image. Expand this heading to enter the three points. When you are done with that, the program will prompt you to click on the image where those three calibration points reside.
- Point 1: Click on the X and Y prompts to type in the X and Y coordinates for the first known point on the image.
- Point 2: Click on the X and Y prompts to type in the X and Y coordinates for the second known point on the image.
- Point 3: Click on the X and Y prompts to type in the X and Y coordinates for the third known point on the image.
- X-Scale is Logarithmic: Check this box if the calibration coordinates for the X-axis, entered above, are plotted using a logarithmic rather than linear scale.
- Y-Scale is Logarithmic: Check this box if the calibration coordinates for the Y-axis, entered above, are plotted using a logarithmic scale. See the diagram below, showing a logarithmically-scaled graph with logarithmic axes being digitized in RockWorks.
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