Details

Autor(en) / Beteiligte

• Mugnier, Clifford J

Titel

GRIDS & DATUMS of THE WORLD

Ist Teil von

• Photogrammetric engineering and remote sensing, 2014-02, Vol.80 (2), p.117-118

Erscheinungsjahr

2014

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• The U. S. Global Positioning System (GPS) satellites have revolutionized surveying and mapping activities. First-order astronomical theodolites are now used as bookends or displays in museums. Little classical triangulation is done outside of academic instruction because of the enormous cost-savings afforded by differential GPS techniques. However, the fruits of centuries of detailed and largely reliable classical surveys are the basic foundation of today's national topographic maps existing in every country throughout the world. When we venture into a "new" mapping project, there is some pre-existing survey data that will have to be incorporated into that data set.