by Slack Groverglow
Last Updated May 22, 2020 22:22 PM - source

I have the two points in `NAD_1983_UTM_Zone_8N`

```
A: 520474.065771355,7146471.63532946
B: 523398.322298721,7146491.17961279,1056.79350172838
Distance A-B: 2925.739824m
```

When I convert them to `NAD_1983_UTM_Zone_10N`

I get the points:

```
A: -54764.4762031343,7197193.19405588
B: -51878.0632641406,7196659.83388472
Distance A-B: 2936.689978m
```

Both coordinate systems are using the same spheroid and datum. What is causing the 11m discrepancy between the A-B distances?

In UTM projection, distortion is small near central meridian, when you move away it increases. `A`

and `B`

are near central meridian in `UTM Zone 8`

. When you convert them to `UTM Zone 10`

, coordinates of `A`

and `B`

are calculated based on in `UTM Zone 10`

.

After converting, points are in the same location on earth, but far from central meridian of `Zone 10`

in comparison with `Zone 8`

's. Therefore, distortion of `A-B`

distance is more. This is nature of UTM.

May 22, 2020 22:18 PM

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