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geoid and ellispoid

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Philip Sargent
2025-02-13 15:42:13 +00:00
parent f1686578c8
commit 45fcc2d62e
2 changed files with 8 additions and 8 deletions
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handbook/survey/lasers.htm
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@@ -97,8 +97,11 @@ noted as possibly being dodgy, but we have no real indication of why.</p>
<p>This table shows the coordinates of the laser points in UTM using the WGS84
datum, which is the coordinate system we now use for the expo dataset (and
which the Austrian's kataster also now uses). If you want the original
coordinates, see the <i>*fix</i> commands in the file fixedpts/laser.svx
coordinates, see the <i>*fix</i> commands in the file <var>fixedpts/laser.svx</var>
in the Survex dataset.</p>
<p>[Just noticed in 2025: the altitudes in <var>loser/fixedpts/laser.svx</var> are not
te same as those in the table below. Current altitudes are 46.81m lower as we now measure altitude from
the geoid not the ellispoid; or <a href="https://support.virtual-surveyor.com/support/solutions/articles/1000261349-the-difference-between-ellipsoidal-geoid-and-orthometric-elevations-">possibly vice-versa</a>.]</p>
<table class="trad">
<tr><th>Code</th><th> Easting</th><th> Northing</th><th> Altitude</th><th>