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A test target is a common feature on interplanetary landing craft such as the Viking Lander and Mars Exploration Rovers. The target is usually a visible marker or plate on the exterior of the vehicle, within sight of the lander's imaging system, usually a CCD camera. The target first possesses samples of primary colors and a grey scale. The camera uses this much like a photographer would use a chip chart on Earth; the color samples allow the camera to compensate for white balance and contrast. The target provides a visual reference as well, so that the initial orientation of the camera can be fixed.

On the Mars Exploration Rover, the target was designed with a pillar elevated above the main surface, so that the targe could be used as a sundial.

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	A '''~~Test~~ ~~Target~~''' is a common feature on interplanetary landing craft such as the [[Viking Lander]] and [[Mars Exploration Rover]]s. The target is usually a visible marker or plate on the exterior of the vehicle, within sight of the lander's imaging system, usually a [[CCD]] [[camera]]. The target first possesses samples of [[primary colors]] and a [[grey scale]]. The camera uses this much like a photographer would use a [[chip chart]] on Earth; the color samples allow the camera to compensate for [[white balance]] and [[contrast]]. The target provides a visual reference as well, so that the initial [[orientation]] of the camera can be fixed.		A '''test target''' is a common feature on interplanetary landing craft such as the [[Viking Lander]] and [[Mars Exploration Rover]]s. The target is usually a visible marker or plate on the exterior of the vehicle, within sight of the lander's imaging system, usually a [[CCD]] [[camera]]. The target first possesses samples of [[primary colors]] and a [[grey scale]]. The camera uses this much like a photographer would use a [[chip chart]] on Earth; the color samples allow the camera to compensate for [[white balance]] and [[contrast]]. The target provides a visual reference as well, so that the initial [[orientation]] of the camera can be fixed.

	On the Mars Exploration Rover, the target was designed with a pillar elevated above the main surface, so that the targe could be used as a [[sundial]].		On the Mars Exploration Rover, the target was designed with a pillar elevated above the main surface, so that the targe could be used as a [[sundial]].