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The Thematic Mapper (TM) instruments onboard Landsats 4 and 5 provide high-quality imagery appropriate for many different applications, including land cover mapping, landscape ecology, and change detection. Precise calibration was considered to be critical to the success of the Landsat 7 mission and, thus, issues of calibration were given high priority(More)
The Landsat 8 spacecraft was launched on 11 February 2013 carrying the Operational Land Imager (OLI) payload for moderate resolution imaging in the visible, near infrared (NIR), and short-wave infrared (SWIR) spectral bands. During the 90-day commissioning period following launch, several on-orbit geometric calibration activities were performed to refine(More)
A joystick controlled wheelchair can be an awkward steering apparatus for a person with poor motor skills. An alternate steering apparatus would be a set of four sensors placed underneath a wheelchair's lapboard. There would be one set of sensors for each direction the wheelchair can move. When an object is placed over the sensors, the wheelchair will move(More)
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