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2. Trimble Inc. - Wikipedia

   en.wikipedia.org/wiki/Trimble_Inc.

   Trimble Inc. is an American software, hardware, and services technology company. Trimble also does hardware development of global navigation satellite system (GNSS) receivers, scanners, total stations, laser rangefinders, unmanned aerial vehicles (UAVs), inertial navigation systems and software processing tools.

3. Satellite geodesy - Wikipedia

   en.wikipedia.org/wiki/Satellite_geodesy

   Optical triangulation with the BC-4, PC-1000, MOTS, or Baker Nunn cameras consisted of photographic observations of a satellite, or flashing light on the satellite, against a background of stars. The stars, whose positions were accurately determined, provided a framework on the photographic plate or film for a determination of precise ...

4. Earth Gravitational Model - Wikipedia

   en.wikipedia.org/wiki/Earth_Gravitational_Model

   This gravitational model is complete to spherical harmonic degree and order 2159 (block diagonal), and contains additional coefficients extending to degree 2190 and order 2159. It provides a raster of 2.5′×2.5′ and an accuracy approaching 10 cm. 1'×1' is also available [ 7 ] in non-float but lossless PGM , [ 5 ] [ 8 ] but original .gsb ...

5. Geodetic Reference System 1980 - Wikipedia

   en.wikipedia.org/wiki/Geodetic_Reference_System_1980

   The geometrical separation between it and the reference ellipsoid is called the geoidal undulation, or more usually the geoid-ellipsoid separation, N. It varies globally between ±110 m. A reference ellipsoid, customarily chosen to be the same size (volume) as the geoid, is described by its semi-major axis (equatorial radius) a and flattening f.

6. SketchUp - Wikipedia

   en.wikipedia.org/wiki/SketchUp

   SketchUp is a 3D modeling software that is used to create and manipulate 3D models. It is used in architecture and interior design.. SketchUp is owned by Trimble Inc. The software has a free web-based version, and three paid subscriptions to gain access to applications for Windows and macOS.

7. North American Datum - Wikipedia

   en.wikipedia.org/wiki/North_American_Datum

   [2] [16] The new gravimetric geoid model is the product of the Gravity for the Redefinition of the American Vertical Datum (GRAV-D) project. These new reference frames are intended to be easier to access and to maintain than NAD 83 and NAVD 88, which rely on physical survey marks that deteriorate over time.