I have always used local coordinates when referencing my surveys to pipeline stationing, but recently have started using state plane coordinates so that down the road if someone needs to know where we were looking at old survey reports would be able to locate the pipeline with more accuracy.
With that being said, What coordinate system would you use if the entry point is in Texas, drilling under the Sabine river with an exit point in Louisiana??ÿ
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Thanks for your time.
Regardless of which projection was chosen, I would reference the salient points with geodetic coordinates and ties to published NGS control/CORS and the nearest corners. If you really want it nailed down for whoever may follow, set reference monuments where they are most accessible and survivable, again with both geodetic and your projection coordinates of choice.
I??d use whichever one the owner of the pipeline would prefer, or whichever one includes most of the line. ?ÿ Most of the CORS stations that are close to state lines have the coordinates for both zones published for situations like this. ?ÿ
as mentioned above, best to list geodetic as well. ?ÿSome of our clients are to the point that they request a table in NAD27, NAD83, WGS84, local Cartesian, and SPC for all their points. ?ÿIt can get very tedious to review the data that goes out the door. ?ÿ???ª
This is a very interesting post. At first, I was curious about the geographical aspects of it. That investigation prompted me to investigate the historical aspects.
https://docslib.org/doc/10225994/the-sabine-river-boundary-between-texas-and-louisiana
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As others have noted, geodetic coordinates remove the issue of determining the appropriate zone. As you now work with SPCs, don??t you choose one zone then compute your points in it?
The following statements are derived from the reading on the tool and not any rigourous testing or use.
Transforming SPCs to Geodetic is supported by?ÿthe NGS NCAT tool. Transforming geodetic coordinates to your preferred SPC zone is also available in NCAT. There is a multi-coordinate input option.
The output of NCAT can be provided in multiple formats including SPC,UTM,USNG and XYZ. ?ÿI do not see a provision for output in multiple SPC zones.
As UTM zones are much larger, one could work in that system without concern for state boundaries.
Note that NGS data sheets in near-border areas include data in multiple zones (all computed from the geodetic coordinates). See screen capture:
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A screen capture of the NCAT tool is here:
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The version starting with SPCs is:
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One last note, if you are working in SPC you have a Northing and Easting but no height. Your geodetic coordinates (and XYZ) will be on the surface of the reference ellipsoid (GRS80).
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Maybe list coordinates for both zones for critical points say ~1 mile in each side of the state line?
Unless your client requested a specific coronation system cut out more points potential points of confusion in the future and use geodetic cordiantates and bearings.?ÿ
WGS 84
Javad. Uses lat Lon as its native coord. System. Then, allows up to 10 simultaneous expressions of those. These are called pages.?ÿ
as one of the others have mentioned, lat Lon is a good way to go. Then, they can be expressed as needed, to go with any mfr system or projection.?ÿ
rectangular coords are for flat earthers !! Sorta ?ÿ
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