Geodesy Archives - GIS Geography https://gisgeography.com/tag/geodesy/ Geographic Information Systems Thu, 17 Apr 2025 10:37:53 +0000 en-US hourly 1 https://wordpress.org/?v=6.9 https://gisgeography.com/wp-content/uploads/2019/01/cropped-GISGeography-SiteIcon-32x32.jpg Geodesy Archives - GIS Geography https://gisgeography.com/tag/geodesy/ 32 32 How the Public Land Survey System (PLSS) Works https://gisgeography.com/public-land-survey-system-plss/ https://gisgeography.com/public-land-survey-system-plss/#comments Wed, 27 Mar 2024 14:01:00 +0000 https://gisgeography.com/?p=90365 Learn how the Public Land Survey System (PLSS) works, which divides land in the United States into townships, ranges, and sections.

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]]> https://gisgeography.com/public-land-survey-system-plss/feed/ 6 Public Land Survey System (PLSS) vs Dominion Land Survey (DLS) https://gisgeography.com/public-land-survey-system-plss-vs-dominion-land-survey-dls/ https://gisgeography.com/public-land-survey-system-plss-vs-dominion-land-survey-dls/#comments Wed, 27 Mar 2024 14:00:00 +0000 https://gisgeography.com/?p=90360 The Dominion Land Survey (DLS) and the Public Land Survey System (PLSS) divide the land to help distribute land and assign land titles.

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]]> https://gisgeography.com/public-land-survey-system-plss-vs-dominion-land-survey-dls/feed/ 2 Geodesy: The Mathematics of “Where” https://gisgeography.com/geodesy/ https://gisgeography.com/geodesy/#respond Sat, 22 Jul 2017 02:13:26 +0000 http://gisgeography.com/?p=12613 Geodesy is the field of applied mathematics that studies Earth’s shape, orientation, positions and gravity for the past, present and future.

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]]> https://gisgeography.com/geodesy/feed/ 0 The Geoid – Hypothetical Mean Sea Level https://gisgeography.com/geoid-mean-sea-level/ https://gisgeography.com/geoid-mean-sea-level/#comments Sat, 20 Feb 2016 13:21:52 +0000 http://gisgeography.com/?p=9487 The geoid measures mean sea level and gravity. The GRACE and GOCE satellites are providing the most accurate measurements of the geoid to this date.

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]]> https://gisgeography.com/geoid-mean-sea-level/feed/ 3 Vertical Datum – Earth’s Elevation Reference Frame https://gisgeography.com/vertical-datum/ https://gisgeography.com/vertical-datum/#respond Fri, 18 Dec 2015 04:04:24 +0000 http://gisgeography.com/?p=5106 A vertical datum is a reference surface of zero elevation to which heights are referred to. Datums are used to measure height and depth from mean sea level.

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]]> https://gisgeography.com/vertical-datum/feed/ 0 Survey Benchmark Monument Locations https://gisgeography.com/survey-benchmark-monument-location-geocache/ https://gisgeography.com/survey-benchmark-monument-location-geocache/#comments Sat, 25 Jul 2015 09:30:22 +0000 http://gisgeography.com/?p=5077 If you're serious about geocaching, than you've probably heard of benchmark hunting. A survey benchmark is a disk in the ground with a latitude & longitude.

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]]> https://gisgeography.com/survey-benchmark-monument-location-geocache/feed/ 11 Magnetic North vs Geographic (True) North Pole https://gisgeography.com/magnetic-north-vs-geographic-true-pole/ https://gisgeography.com/magnetic-north-vs-geographic-true-pole/#comments Mon, 29 Jun 2015 09:00:43 +0000 http://gisgeography.com/?p=5129 The Magnetic North Pole is a point in Northern Canada where the northern lines of attraction enter the Earth. Compass needles point to the magnetic north.

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]]> https://gisgeography.com/magnetic-north-vs-geographic-true-pole/feed/ 112 Ellipsoid/Spheroid – Our Oblate Spheroid Planet Earth https://gisgeography.com/ellipsoid-oblate-spheroid-earth/ https://gisgeography.com/ellipsoid-oblate-spheroid-earth/#comments Mon, 12 Jan 2015 03:39:25 +0000 http://gisgeography.com/?p=10428 Reference ellipsoids (ex. Clarke Ellipsoid) are smooth, mathematical models of the Earth's shape. It has a semi-major and minor axis flattened at the poles.

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]]> https://gisgeography.com/ellipsoid-oblate-spheroid-earth/feed/ 13 What is a Horizontal Datum Reference Frame? https://gisgeography.com/horizontal-datum/ https://gisgeography.com/horizontal-datum/#comments Sat, 14 Jun 2014 11:12:06 +0000 http://gisgeography.com/?p=10418 A horizontal datum provides a reference frame for latitude and longitude coordinates on the Earth. A datum is constructed through surveys and triangulation.

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