Nate The Surveyor
Well-Known Member
One of the more interesting things that got put into the LS during my original configurations, (with Shawn Billings on the phone) was the epoch date. It was 2010. I noticed this post over on the other forum:
A guy called "Mapman" posted this:
I had a general idea of what Epoch Date was doing... But this was a bit more to the point.
I guess it should be a part of the metadata I put on my surveys. ie, Epoch dates.
Any further comments would be welcomed.
I want to compile a metadata list that is good, practical, and needed, for use on my surveys.
What does your meta data list look like?
Thanks
Nate
A guy called "Mapman" posted this:
Good intro. The HDTP program is slightly different from 2006 I think. Here is a newer result.
HTDP (VERSION v3.2.5 ) OUTPUT
UPDATED POSITIONS IN NAD_83(2011/CORS96/2007)
FROM 5-08-1991 TO 1-01-2007 (month-day-year)
FROM 1991.350 TO 2007.000 (decimal years)
OLD COORDINATE NEW COORDINATE VELOCITY DISPLACEMENT
LATITUDE 33 40 18.87000 N 33 40 18.88498 N 28.20 mm/yr 0.462 m north
LONGITUDE 117 50 24.00000 W 117 50 24.01484 W -24.62 mm/yr -0.382 m east
ELLIP. HT. 25.000 24.984 -1.22 mm/yr -0.016 m up
X -2481446.101 -2481446.314 -14.00 mm/yr -0.212 m
Y -4698527.510 -4698527.094 26.22 mm/yr 0.416 m
Z 3516232.206 3516232.581 22.79 mm/yr 0.376 m
The displacement is the result needed. It shows the estimated amount of shift from one date to another. This can be directly applied to the "original" coordinates to bring them into this epoch or whatever epoch you need. In this example you get an idea of how much it actually moves over time.
I thought a bit about it. To be able to place an epoch date in it, automates this portion of the migration of land masses. I thought that Mapman's fairly simple explanation was good. And, would possibly be of benefit to some of the Javad Users here. So, I re posted it. HTDP (VERSION v3.2.5 ) OUTPUT
UPDATED POSITIONS IN NAD_83(2011/CORS96/2007)
FROM 5-08-1991 TO 1-01-2007 (month-day-year)
FROM 1991.350 TO 2007.000 (decimal years)
OLD COORDINATE NEW COORDINATE VELOCITY DISPLACEMENT
LATITUDE 33 40 18.87000 N 33 40 18.88498 N 28.20 mm/yr 0.462 m north
LONGITUDE 117 50 24.00000 W 117 50 24.01484 W -24.62 mm/yr -0.382 m east
ELLIP. HT. 25.000 24.984 -1.22 mm/yr -0.016 m up
X -2481446.101 -2481446.314 -14.00 mm/yr -0.212 m
Y -4698527.510 -4698527.094 26.22 mm/yr 0.416 m
Z 3516232.206 3516232.581 22.79 mm/yr 0.376 m
The displacement is the result needed. It shows the estimated amount of shift from one date to another. This can be directly applied to the "original" coordinates to bring them into this epoch or whatever epoch you need. In this example you get an idea of how much it actually moves over time.
I had a general idea of what Epoch Date was doing... But this was a bit more to the point.
I guess it should be a part of the metadata I put on my surveys. ie, Epoch dates.
Any further comments would be welcomed.
I want to compile a metadata list that is good, practical, and needed, for use on my surveys.
What does your meta data list look like?
Thanks
Nate