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display xy points at correct location

panlu

I have the data downloaded on-line and have no idea about the original coordinate system. I observed the x and y values, they looks like in meters,

The latitude is something like: 468769600, and longitude like: -1028108400. the points should located in ND, and I tried UTM14N and WGS1984 none of them works. Any help would be appreciated. Many thanks

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Accepted answers

MelitaKennedy

Weirdly enough, these might be scaled latitude and longitude.

Original:

latitude: 468769600

longitude: -1028108400

If I divide by 10000000,

latitude: 46.8769600

longitude: -102.8108400

which certainly fits North Dakota.

All comments

JoeBorgione

Good catch Melita! I used to have a system that did that same sort of calculation to put the intersection of the Prime Meridian and the Equator in Murray, Utah. And on top of that, it would split things into quadrants where the NW was -X, +Y; NE was +X +Y; SE was +X, -Y; SW was -X,-Y.

I'd look at the coordinate values with a mirror while standing on my head to figure them out...

panlu

Thanks, I could not see the button earlier. Done now.

XanderBakker

pan lu‌, could you mark the thread as answered? In the lower left corner of Melita's post, there should be a button "Correct Answer".

panlu

Yes, you are life saver. After I divide by 10000000, they are mapped at correct locations. Thanks a lot!!

MelitaKennedy

Weirdly enough, these might be scaled latitude and longitude.

Original:

latitude: 468769600

longitude: -1028108400

If I divide by 10000000,

latitude: 46.8769600

longitude: -102.8108400

which certainly fits North Dakota.

DarrenWiens2

I don't think you can determine the unit by the magnitude of the coordinates. They are just numbers - you could make a custom coordinate system with the origin 1,000,000 times the circumference of the Earth away from your data. How did you decide that your unit is cm, other than they are large numbers?

Where did you download this data from? There was surely metadata.

panlu

Yes, you are right. the values in my table looks like in a unit of cm. What coordinate system would generate CM values?

panlu

tried but still not work. There are several outliers (with 0 Lat/Lon values) I don't know if those can cause trouble

XanderBakker

I think you an issue with the decimal sign of the coordinates. If your x-coord (longitude) is expressed in meters, it would be like 25-26 times the circumference of the world. That doesn't make sense.

JoeBorgione

Just a guess: check for a ND state plane coordinate system....

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