DOC: Update overview

Author: rstoneback

docs/overview.rst

@@ -4,35 +4,25 @@ Overview
 ========
 
 The derivation of an appropriate vector basis has been a long-term challenge
-in space science. The vector basis in current use is non-orthogonal and as
-such presents a number of challenges when attempting to apply it to space
-science studies. This package provides for the calculation of an orthogonal
-vector basis, consistent with the underlying physics, for general magnetic
-fields. Further, OMMBV calculates scaling factors suitable for translating
-an electric field at one location to any other location on the field line.
+in space science. This package provides the first accurate orthogonal
+vector basis that supports mapping electric fields or other parameters at one
+location to any other location on the same field line.
 OMMBV retains these properties for non-spherical planets, such as the Earth, as
 well as for magnetic fields that are more complicated than a pure dipole, such
 as the Earth's.
 
 These features are fundamental for Space Science studies. Satellite measurements
 of plasma motions in-situ can now be accurately mapped along field lines
-for comparison to ground based equipment. Forcings from the neutral atmosphere
-(in say Earth's E-region Ionosphere) may now also be mapped to satellite
-altitudes to accurately characterize both the magnitude and direction
-of that forcing on plasma motion at satellite locations. Computer modelers
-may use OMMBV to map electric fields calculated within a single plane through
-the whole magnetosphere, significantly reducing computational resources.
+for comparison to ground based equipment. Forcing from the neutral atmosphere
+may now also be mapped to satellite altitudes to accurately characterize
+both the magnitude and direction of that forcing on plasma motion at satellite
+locations. Computer modelers may use OMMBV to map electric fields calculated
+within a single plane through the whole magnetosphere, significantly reducing
+computational resources.
 
 OMMBV has been validated using a variety of test magnetic sources as well as
 via application to the Earth's magnetic field using the
 `International Geomagnetic Reference Field (IGRF) <https://geomag.bgs.ac.uk/research/modelling/IGRF.html>`_.
-Further, OMMBV includes two paths to determine the relevant vector basis. Both
-paths will only result in the same answers if the underlying system is truly
-orthogonal. The statistical performance of OMMBV between IGRF with a geodetic
-Earth and a spherical Earth with a pure dipole magnetic field is the same.
-OMMBV vectors are accurate up to 6-7 digits of precision at default calculation
-settings.
-
 
 .. image:: images/logo_high_res.png
     :width: 400px