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"We cut over the fields at the back with him between us – straight as the crow flies – through hedge and ditch." [1] While crows do conspicuously fly alone across open country, they do not fly in especially straight lines. [3] While crows do not swoop in the air like swallows or starlings, they often circle above their nests. [3]
We can measure the distance between two such points by the length of the shortest path along the surface, "as the crow flies"; this is particularly useful for shipping and aviation.
A diagram illustrating great-circle distance (drawn in red) between two points on a sphere, P and Q. Two antipodal points, u and v are also shown. The great-circle distance, orthodromic distance, or spherical distance is the distance between two points on a sphere, measured along the great-circle arc between them. This arc is the shortest path ...
In practice, one is often interested in the travel distance between two points along roads, rather than as the crow flies. In a grid plan, the travel distance between street corners is given by the Manhattan distance: the number of east–west and north–south blocks one must traverse to get between those two points.
1.010 Mm – distance from San Diego to El Paso as the crow flies; 1.100 Mm – length of Italy; 1.200 Mm – length of California; 1.200 Mm – width of Texas; 1.500 Mm – length of the Gobi Desert; 1.600 Mm – length of the Namib, the oldest desert on Earth; 2.000 Mm – distance from Beijing to Hong Kong as the crow flies
The researchers found that mountain lions of Los Angeles are shifting their activities, avoiding typically human-frequented spaces to maintain a safe distance. Image credits: an1malpulse #5
The grid distance or rectilinear distance (sometimes called the "Manhattan distance") between two points is never shorter than the length of the line segment between them (the Euclidean or "as the crow flies" distance).
Watch the Video. Click here to watch on YouTube. The ostrich is quite an unusual animal. With its giant feathery plumes, massive feet, and long spindly legs, it looks like something right out of a ...