Source: libgeo-helmerttransform-perl Section: perl Priority: optional Build-Depends: debhelper (>= 10) Build-Depends-Indep: perl (>= 5.8.8-6.1) Maintainer: Debian Perl Group Uploaders: Dominic Hargreaves Standards-Version: 4.1.3 Homepage: http://search.cpan.org/dist/Geo-HelmertTransform/ Vcs-Browser: https://salsa.debian.org/perl-team/modules/packages/libgeo-helmerttransform-perl Vcs-Git: https://salsa.debian.org/perl-team/modules/packages/libgeo-helmerttransform-perl.git Package: libgeo-helmerttransform-perl Architecture: all Depends: ${perl:Depends}, ${misc:Depends}, Description: Transformations between coordinates in different datums It is usual to describe geographical points in terms of their polar coordinates (latitude, longitude and altitude) referenced to a "datum ellipsoid", which is used to approximate the Earth's geoid. The latitude, longitude and altitude of a given physical point vary depending on which datum ellipsoid is in use. Unfortunately, a number of ellipsoids are in everyday use, and so it is often necessary to transform geographical coordinates between different datum ellipsoids. . Two different datum ellipsoids may differ in the locations of their centers, or in their shape; and there may be an angle between their equatorial planes or the meridians relative to which longitude is measured. The Helmert Transform, which this module implements, is a linear transformation of coordinates between pairs of datum ellipsoids in the limit of small angles of deviation between them.