
Survey Marker
• U.S. Geological Survey • Bench mark• Elevation above sea 447 feet• I love finding these survey markers. It's somehow reassuring.• I like that someone, somewhere, knows where this spot is.• If I stand on it, they know where I am.• But the NAD83 and NAVD88 datums are getting replaced soon. That marker's coordinates could shift by like 5 feet.• Oh look, it just got updated.• Hey! Put me back!
Fun fact: The standard North American NAD83 coordinate system is misaligned from the actual Earth, off-center by about 7 feet. Someone knows where I am, and I'm in the wrong place.
- 美国地质调查局
- 基准点
- 海拔 447 英尺
- 我喜欢找到这些测量标记。它们令人安心。
- 我喜欢在某个地方的某人知道这个地方在哪。
- 如果我站在上面,他们就知道我在哪里。
- 但 NAD83 和 NAVD88 基准即将被替换。这个标记的坐标可能会偏移约 5 英尺。
- 哦,看,它刚刚更新了。
- 嘿!把我放回去!
有趣的事实:标准的北美 NAD83 坐标系统与地球实际位置不对齐,偏离了大约 7 英尺。有人知道我在哪里,而我却在错误的地方。