derivative of arctan

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8 documents for derivative of arctan

- A geodesic map projection for quadrilaterals.
...The arc-length of each edge is Arctan(2[square root 2]), about 70.53[degrees]. This and ... cusps (discontinuities in the first derivative) are discussed by van Leeuwen and Strebe (2006). ....
- Cartography and Geographic Information Science
- Vol. 36 Nbr. 2, April 2009
- 'Yu laid out the lands:' georeferencing the Chinese Yujitu [Map of the Tracks of Yu] of 1136.
...Eratosthenes: radius of Earth = d/(arctan ([[s.sub.1]/h]) - arctan ([s.sub.2]/h)) . Thus a v...Formally this means: . [[partial derivative][phi]]/[[partial derivative]t](x) = v([[phi].sub.t...
- Cartography and Geographic Information Science
- Vol. 39 Nbr. 3, July 2012
- Spatial resolution and algorithm choice as modifiers of downslope flow computed from digital elevation models.
... of surface parameters and their derivatives has been a subject of DEM research ever since the ...Slope = arctan ([square root of [Z.sup.2] x + [Z.sup.2] y) (1) . ...
- Cartography and Geographic Information Science
- Vol. 34 Nbr. 3, July 2007
- Labor market inefficiency and economic restructuring: evidence from cross-sectoral data.
... shock z: dV/dU = [[partial derivative]V/[partial derivative](log z)]/[[partial derivativ... increase in log U is [DELTA]u = W cos[arctan(-1/z)]. Thus, the predicted increase in unemployme...
- Southern Economic Journal
- Vol. 74 Nbr. 1, July 2007