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High Resolution 1:10,000 scale Mapping Strategy of Multi ... - NDMA

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adjustment determines the ground coordinates <strong>of</strong> any tie points manually or<br />

automatically measured on the overlap areas <strong>of</strong> multiple images. The highly<br />

precise ground point determination <strong>of</strong> tie points is useful for generating control<br />

points from imagery in lieu <strong>of</strong> ground surveying techniques. Additionally, if a<br />

large number <strong>of</strong> ground points is generated, then a DEM can be interpolated<br />

using the 3D surfacing.<br />

• Block adjustment minimizes and distributes the errors associated with the<br />

imagery, image measurements, GCPs, and so forth. The block adjustment<br />

processes information from an entire block <strong>of</strong> imagery in one simultaneous<br />

solution (i.e., a bundle) using statistical techniques (i.e., adjustment<br />

component) to automatically identify, distribute, and remove error. Because<br />

the images are processed in one step, the misalignment issues associated<br />

with creating mosaics are resolved.<br />

Satellite Photogrammetry<br />

Figure App 20.6: Interior orientation in satellite imagery scene<br />

213

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