How much Endlap do you need for stereo pairs?

This lapping along the flight strip is called end lap and the area of coverage common between two adjacent pair of photographs called in a flight strip is called stereoscopic overlap (end lap). The amount of end lap is normally from 55% to 65%. The pair of photograph is called stereo pair.

What is crab and drift?

Crab occurs when the aircraft is not oriented with flightline. It causes a reduction in a stereoscopic coverage of the terrain. It can be corrected by rotating the camera around the vertical axis. Drift is the result of not be able the unmanned aircraft to keep the planned navigation bearing.

What exactly is stereoscopy?

Stereoscopy is the production of the illusion of depth in a photograph, movie, or other two-dimensional image by the presentation of a slightly different image to each eye, which adds the first of these cues (stereopsis). The two images are then combined in the brain to give the perception of depth.

How is stereoscopic parallax measured?

Parallax can be measured by the angle of inclination between those two lines. Nearby objects have larger parallax than distant objects when observed from different positions. This difference in parallax gives a three-dimensional effect when stereo pairs are viewed stereoscopically.

What is eye base photogrammetry?

Eye base: The distance and orientation of the line between centers of rotation of eye ball of an individual.

What is photogrammetry side lap?

Side lap is a term used in photogrammetry to describe the amount of overlap between images from adjacent flight lines (see Figure 4.8). Figure 4.8 illustrates an aircraft taking two overlapping photographs from two adjacent flight lines. The distance in the air between the two flight lines (W) is called lines spacing.

What is side lap?

Side lap is a term used in photogrammetry to describe the amount of overlap between images from adjacent flight lines (see Figure 4.8). The distance in the air between the two flight lines (W) is called lines spacing.

How absolute parallax is different than differential parallax?

The absolute stereoscopic parallax is 12.36 mm in this case, i.e., the sum of the distances of the corresponding images from their respective nadirs. Differential parallax in this case is the difference in the absolute stereoscopic parallax at the top and base objects being measured, i.e., 12.3−12.32 = 0.04.

What are the most common coverage ratios?

The most common coverage ratios are: Interest coverage ratioInterest Coverage RatioInterest Coverage Ratio (ICR) is a financial ratio that is used to determine the ability of a company to pay the interest on its outstanding debt.

What is the difference between a higher and lower coverage ratio?

A higher ratio indicates a greater ability of the company to meet its financial obligations while a lower ratio indicates a lesser ability. Coverage ratios are commonly used by creditors and lenders to determine the financial standing of a prospective borrower.

What is the asset coverage ratio (ACR)?

The asset coverage ratio (ACR) evaluates a company’s ability to repay its debt obligations by selling its assets. In other words, this ratio assesses a company’s ability to pay debt obligations with assets after satisfying liabilities.

What is interest coverage ratio (ICR)?

The interest coverage ratio (ICR), also called the “times interest earned”, evaluates the number of times a company is able to pay the interest expenses on its debt with its operating income. As a general benchmark, an interest coverage ratio of 1.5 is considered the minimum acceptable ratio.