# Hellmut Schmid

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Not to be confused with [Helmut Schmidt](/source/Helmut_Schmidt).

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**Hellmut H. Schmid** (12 September 1914 – 27 April 1998) was a Swiss professor of [geodesy](/source/Geodesy) and [photogrammetry](/source/Photogrammetry). He taught at [ETH Zürich](/source/ETH_Z%C3%BCrich) (Switzerland). In the 1950s, he worked on [space exploration](/source/Space_exploration) in the United States. Between 1968 and 1974, he promoted the first [intercontinental](/source/Continent) network of [satellite geodesy](/source/Satellite_geodesy).

## Research

- Geodetic measurement methods at the [V2](/source/V-2_rocket) project in [Peenemünde](/source/Peenem%C3%BCnde) (~1942)

- Beginnings of [satellite geodesy](/source/Satellite_geodesy) 1959

- Theory of [analytical photogrammetry](https://en.wikipedia.org/w/index.php?title=Analytical_photogrammetry&action=edit&redlink=1) and [matrix](/source/Matrix_(mathematics))/[IT](/source/Information_technology) developments (1950s, USA)

- High precision evaluation of [photogram](/source/Photogram) (ca. 1965-1978)

- [Worldwide Satellite Triangulation Network](https://en.wikipedia.org/w/index.php?title=Worldwide_Satellite_Triangulation_Network&action=edit&redlink=1) (1969-1973 (publ. 1974): first regular intercontinental network, 46 stations (3000–5000 km apart), pioneering accuracy (±3m)

- Contributions to the [least-squares adjustment](/source/Least-squares_adjustment), network optimization, [Block triangulation](https://en.wikipedia.org/w/index.php?title=Block_triangulation&action=edit&redlink=1)

- Optimization of [coordinate transformations](/source/Coordinate_system#Transformations) (~1975)

- Development of [3D](/source/Three-dimensional_space) [intersection](/source/Line-plane_intersection) methods in analytical photogrammetry

## See also

- [PAGEOS](/source/PAGEOS), [balloon satellites](/source/Balloon_satellite), [stellar triangulation](/source/Stellar_triangulation)

- Global [reference ellipsoid](/source/Reference_ellipsoid), "Earth [polyhedron](/source/Polyhedron)", [geodetic system](/source/Geodetic_system), [WGS84](/source/WGS84)

- [ETH Zürich](/source/ETH_Z%C3%BCrich), [Ohio State University](/source/Ohio_State_University), [Friedrich Hopfner](/source/Friedrich_Hopfner)

## Literature

- [K.Ledersteger](/source/Karl_Ledersteger): "'Astronomische und Physikalische Geodäsie ([Erdmessung](/source/Erdmessung))", *JEK* **Vol.V** (870 S., espec. §§ 2, 5, 13), J.B.Metzler, Stuttgart 1968

- H.H. Schmid: "Das Weltnetz der [Satellitentriangulation](/source/Satellite_triangulation)". *Wiss. Mitteilungen* [ETH Zürich](/source/ETH_Z%C3%BCrich) and *Journal of Geophysical Research*, 1974.

- Klaus Schnädelbach et al.: *Western European Satellite Triangulation Programme (WEST), 2nd Experimental Computation*. Mitteilungen Geodät.Inst. Graz 11/1, Graz 1972

- Nothnagel, Schlüter, Seeger: *Die Geschichte der geodätischen [VLBI](/source/VLBI) in Deutschland*, Bonn 2000

- [ZfV](https://de.wikipedia.org/wiki/Zeitschrift_f%C3%BCr_Vermessungswesen) 1998: Hellmut H. Schmid † (obituary).

- [Professor Dr. h.c. HellmutH. Schmid (1914- 1998)](https://www.isprs.org/proceedings/Xxxiii/congress/partA/81_XXXIII-PartA.pdf)

- "Dr. Schmid leaves Aberdeen after 12 year to join staff at GIMRADA": United States. Department of the Army (1960). [*Army Research and Development*](https://books.google.com/books?id=6JjCF2Z7-gIC&pg=RA18-PA25). Department of Defense, Department of the Army, Army Materiel Development and Readiness Command, Development and Engineering Directorate. Retrieved 2021-02-05.

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