Commit 7004a1b1 authored by Pascal Parraud's avatar Pascal Parraud
Browse files

typo

parent 73eca74c
......@@ -42,13 +42,15 @@ Frames
one, including velocity composition effects.
Transforms are used both:
** to define the relationship from a parent to a child frames.
This transform (<<tdef>> on the following scheme), is stored in the child frame.
** to merge all individual transforms encountered while walking the tree from one
frame to any other one, whatever far away they are from each other (<<trel>> on the
following scheme).
* to define the relationship from a parent to a child frames.
This transform (<<tdef>> on the following scheme), is stored in the child frame.
* to merge all individual transforms encountered while walking the tree from one
frame to any other one, whatever far away they are from each other (<<trel>> on the
following scheme).
[]
[../images/transform.png]
......@@ -145,15 +147,16 @@ Frames
In summary, Orekit implements the following frames:
** those related to the IERS 2003 convention: GCRF, CIRF 2000, TIRF 2000 with and without
tidal effects, ITRF 2005 with and without tidal effects,
** those related to the older IERS conventions: MEME with and without EOP correction,
TEME with and without EOP correction, PEF with and without EOP correction, Veis 1950.
* those related to the IERS 2003 convention: GCRF, CIRF 2000, TIRF 2000 with and without
tidal effects, ITRF 2005 with and without tidal effects,
* those related to the older IERS conventions: MEME with and without EOP correction,
TEME with and without EOP correction, PEF with and without EOP correction, Veis 1950.
**** CIO-based transformations
Here is a schematic representation of the partial tree containing the supported IERS frames
based on CIO
based on CIO.
[../images/iers-tree.png]
......@@ -193,7 +196,7 @@ Frames
The path from EME2000 to Veis1950, involving the MEME, TEME and PEF without EOP correction is
devoted to some legacy systems, whereas the MEME, TEME and PEF with EOP correction are for
compatibility with the IERS 2003 convention. The gap between the two branches can reach a few
meters, a very crude accuracy in many space systems.
meters, a rather crude accuracy for many space systems.
The same kind of optimization used for the IAU-2000 precession-nutation model are also applied for
the older IAU-1980 precession-nutation model, despite it is much simpler.
......
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