Dr. Dong's Midterm Review List
Terms in this set (5)
Definition of remote sensing
the science of obtaining information about objects or areas from a distance, typically from aircraft or satellites.
Active- Provide their own EMR source (radar, lidar)
Passive- Rely on other sources (i.e. the sun) (landsat, color cameras, Hyperion)
What are the four sensor resolutions that must be determined before acquiring data?
Temporal- how often is data collected
Spatial- how small of an area can be distinguished
Spectral- how many bands can be distinguished and how narrow are those bands
Radiometric- how sensitive is it to value changes
Virtually all remotely sensed data is collected within 2 hours of solar noon to avoid extended shadows in the image or photo. This is because shadows can obscure other objects that could otherwise be identified. On the other hand, the shadow cast by an object may be key to the identity of another object. Take for example the Washington Monument in Washington D.C. While viewing this from above it can be difficult to discern the shape of the monument, but with a shadow cast, this process becomes much easier. It is good practice to orient the photos so that the shadows are falling towards the interpreter. A pseudoscopic illusion can be produced if the shadow is oriented away from the observer. This happens when low points appear high and high points appear low.
What is the difference between pixel size and spatial resolution?
Spatial resolution- the smallest distance a sensor is able to distinguish
Pixel- An image is a matrix made of pixels. A pixel has a value to determine color representation. A pixel's length equals the spatial resolution.
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Mid Term Review