Merge pull request #70 from komatits/devel

added a remark about ellipticity to the users manual.
SPECFEM · May 2, 2014 · 1e48348 · 1e48348
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diff --git a/doc/USER_MANUAL/manual_SPECFEM3D_GLOBE.pdf b/doc/USER_MANUAL/manual_SPECFEM3D_GLOBE.pdf
diff --git a/doc/USER_MANUAL/manual_SPECFEM3D_GLOBE.tex b/doc/USER_MANUAL/manual_SPECFEM3D_GLOBE.tex
@@ -780,6 +780,7 @@ \chapter{\label{cha:Running-the-Mesher}Running the Mesher \texttt{xmeshfem3D}}
 \item [{\texttt{ELLIPTICITY}}] Set to \texttt{.true.} if the mesh should
 make the Earth model elliptical in shape according to Clairaut's equation
 \citep{DaTr98}. This feature adds no cost to the simulation.
+After adding ellipticity, the mesh becomes elliptical and thus geocentric and geodetic/geographic latitudes and colatitudes differ (longitudes are unchanged).
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 From \cite{DaTr98}: "Spherically-symmetric Earth models all have the same hydrostatic surface ellipticity 1/299.8. This is 0.5 percent smaller than observed flattening of best-fitting ellipsoid 1/298.3. The discrepancy is referred to as the "excess equatorial bulge of the Earth", an early discovery of artificial satellite geodesy."
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