Conversion of LineString to GEOGRAPHY throwing an error that makes no sense

I am hoping someone can assist me understanding a very confusing set of circumstances:
I have a database of geographic locations (Latitude / Longitude) that make up routes a person has travelled. To work out the distance travelled I transform these Lat/Lon pairs into a LINESTRIMG, and convert it to type GEOGRAPHY (and then I manipulate it). The problem I am having is repreesented by the code attached (I have many similar examples, but this is the most confusing).

It is not a string length problem; instead it is something to do with the pattern of the data and I am in the dark as to where the problem cound be. GEOGRAPHY-Data.txt
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kemi67Connect With a Mentor Commented:
I agree that there is a problem in the data set.
Linestring must meet some criteria as written here:

Accepted Instances
Accepted LineString instances can be input into a geometry variable, but they may not be valid LineString instances. The following criteria must be met for a LineString instance to be accepted. The instance must be formed of at least two points or it must be empty. The following LineString instances are accepted.

Valid Instances
For a LineString instance to be valid it must meet the following criteria.
The LineString instance must be accepted.
If a LineString instance is not empty then it must contain at least two distinct points.
The LineString instance cannot overlap itself over an interval.

So, as you have done, you must remove the first segment because starting point and ending point are the same.
Furthermore I think that you must search for overlapping over an interval: probabily this is the cause
Do you have a tool to draw the path, so you can visual check overlapping ?
Bird757Author Commented:
Important to note; there cannot be a duplicate data point! Lines can cross but what was causing my error was an exact repeat of a co-ordinate.
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