SP-424 The Voyage of Mariner 10

 

Fig. B-11. Special versions of pictures were also made on which black and white dots are introduced every 25 pixels in the form of a grid on the picture as shown here. By counting pixels on pictures such as this, the coordinates of control points on Mercury's surface were established as part of the map-making process.

 

Fig. B-11. Special versions of pictures were also made on which black and white dots are introduced every 25 pixels in the form of a grid on the picture as shown here. By counting pixels on pictures such as this, the coordinates of control points on Mercury's surface were established as part of the map-making process.

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