GeoConvert.NET (nuget): Lets you perform Helmert (7 - parameter) Transforms, convert to and from Transverse Mercator projections (UTM) and provides simple methods for conversions between the WGS84 (latitude/longitude) and GGRS87 (Greek Grid) systems.
Keywords: greek|grid|helmert|7|-|parameter|transform|spatial|reference|coordinates|convert|WSG84|GGRS87|.NET