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The geometry of resections matters!

Following examples are calculated with BestTachySpot.

 

You may have experienced this before. You are defining a new station and all points with known coordinates are more or less in the same direction. Be careful in this situation.

The situation explained with an example: 

Resection on point 1 with observations to known backsight points on the road north of the site (green in following figure). Goal is to find the coordinates of point 5.

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Accuracy (blue error ellipse in map):

Standard deviation is ver

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Point of Beginning

THE NEW POB

 

The new point of beginning for land surveys is orbiting the earth at 5,000 miles an hour 12 ½ thousand miles up in the stratosphere.  That’s correct and I suppose I owe my fellow professional land surveyors an apology for my participation in the changes we have been going through the last 20 years (see the POB cover article attached).  The fact of the matter is the PLS’s of this country have had our exclusive provenances invaded by all manor of non-surveyor professionals and others. 

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GIS & FEMA Mapping

There is a growing need for accurate land surveying data to be a fundamental requirement for government level geographic information systems. As an example for the USGS National flood inundation mapping science initiative a professional survey level data layer would be of great benefit to help determining exactly which structures in or out of the flood zones. Greetings my name is John W. Veatch. I am a land planner, a professional land development engineer, professional land surveyor, Florida Re

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