Information AboutFlattening |
| CATEGORIES ABOUT FLATTENING | |
| celestial mechanics | |
| geodesy | |
| geophysics | |
|
The flattening, '''ellipticity''', or '''oblateness''' of an Oblate Spheroid is the "squashing" of the spheroid's Pole , down towards its Equator . FIRST AND SECOND FLATTENING The first, primary flattening, ''f'', is the Versine of the spheroid's Angular Eccentricity (""), equaling the relative difference between its equatorial radius, , and its polar radius, : :::
The amount of flattening depends on
and in detail on
There is also a second flattening, ''f' '' (sometimes denoted as "''n''"), that is the half-angle tangent2 of : ::: FLATTENING WITHOUT PICKING Flattening without picking is an efficient full-volume automatic dense-picking method for flattening seismic data. First, local dips (step-outs) are calculated over the entire seismic volume. The dips are then resolved into time shifts (or depth shifts) relative to reference trace using a non-linear Gauss-Newton iterative approach that exploits Discrete Cosine Transforms (DCT's) to minimize computation time. At each point in the image two dips are estimated; one dip in the x direction and one dip in the y direction. Because each point in the image has two dips, each horizon is estimated from an over-determined system of dips in a least-squares sense. SEE ALSO |
|
|