[Proj] Algorithms & Plate Carrée

[Noel Zinn (cc)]

Irwin,

Your question can be interpreted in many ways and it's not clear to me what 
you really mean.  But let me address one interpretation, that of 
registration.

A former colleague of mine used published WGS84 coordinates of airport 
runways and VOR/DME all over the world, north and south, east and west, and 
picked the ties in Google Earth (because the targets are visible).  Most 
often the ties were sub 5 meters.  Less often they were 15 meters or more. 
If the WGS84 registration is of this magnitude, so, too, the UTM.

This is one way of answering your question.  Take it for what it's worth.

Noel

Noel Zinn, Principal, Hydrometronics LLC
+1-832-539-1472 (office), +1-281-221-0051 (cell)
noel.zinn at hydrometronics.com (email)
http://www.hydrometronics.com (website)

-----Original Message----- 
From: Irwin Scollar
Sent: Wednesday, July 18, 2012 10:42 AM
To: proj at lists.maptools.org
Subject: [Proj] Algorithms & Plate Carrée

Roughly what order of magnitude of error would there be in N-S and
E-W in coordinates compared to WGS84 UTM in a Google Earth image
showing a 1 kilometer square at middle latitudes and close to the
central UTM meridian, assuming no distortion due to other causes in
the Google Earth image?

Is there a simple way to calculate this for arbitrary lat/lons
between 70 degrees North or South like a Tissot Indicatrice for small areas?

Irwin Scollar

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