Update and rename ITRF/README to IGRF/README

CGS-GIS · Nov 9, 2018 · 543bbd5 · 543bbd5
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diff --git a/IGRF/README b/IGRF/README
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+The source files in this directory were downloaded from the IGRF web site:
+        https://www.ngdc.noaa.gov/IAGA/vmod/igrf.html
+
+Original directory contains the original igrf12.f program and the current
+(IGRF) directory contains a modification of that file, converting it to a
+subroutine usable in GPSPACE.
+
+Subroutine igrf12syn is called from iono2nd.f to compute 2nd and 3rd order
+ionospheric effects.
diff --git a/ITRF/README b/ITRF/README