Blue Marble Geographics of US announced an update to their GeoCalc 6.1 developer tool kit. This fully object-oriented, cross platform version of Blue Marble’s coordinate conversion libraries was created to meet the accuracy and data conversion needs of GIS and mapping programmers.
GeoCalc 6.1 introduces a vertical datum transformation model that enables 3-D transformations based on various Geoid Models including NGS Vertcon and the following Geoid Models: GEOID96, GEOID99 and GEOID03 for the NGVD29 and NAVD88 vertical datums, AUSGEOID98 for AHD and OSGM02 for the Ordnance Datum Newlyn (ODN) (UK), Belfast Lough (Northern Ireland) and the Malid Head (Republic of Ireland) vertical datums. Higher order polynomial models have been added including LinearPolynomial2D, CubicPolynomial2D, QuadraticPolynomial2D, QuarticPolynomial2D and QuinticPolynomial2D for modeling a more complicated surface.
This release also improves the ease of use of the developer library interface with dialogue improvements. Enhanced Well Known Text support for ESRI, Oracle, and other common dialectics. EPSG support has been upgraded to v6.6 as well.