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| − | (But there are still {{#expr:{{LATESTCOMIC}}-({{PAGESINCAT:Comics}}- | + | (But there are still {{#expr:{{LATESTCOMIC}}-({{PAGESINCAT:Comics}}-10)}} to go. Come and [[List of all comics|add yours]]!) |
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Revision as of 16:59, 20 November 2012
Welcome to the explain xkcd wiki! We already have 5 comic explanations!
(But there are still 2915 to go. Come and add yours!)
Latest comic
| Survey Marker |
 Title text: 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. |
Explanation
|
This explanation may be incomplete or incorrect: Created by a GUIDED MISSILE THAT MISSED THE TARGET DUE TO COORDINATE DRIFT - Please change this comment when editing this page. Do NOT delete this tag too soon. |
Cueball and Megan have found a survey marker on the ground. Survey markers such as these are used to define the NAD 83 and NAVD 88 systems, and the National Geodetic Survey has a database storing the coordinates of these markers. Those two systems however are being replaced by the New Datums of 2022 (delayed to 2024-2025), and is primarily based off of satellite systems and gravimetric models.
When they update the database, in the comic Cueball's position changes to compensate. In reality updating a database to change the coordinates of a location would not physically move the location.[citation needed]
The title text refers to NAD 83 being around 7 feet off. This is in reference to both WGS84 and presumably the New Datum.
Transcript
- [Zoomed in view of a round marker on the ground, with small specks of dirt around it. There is one line of text going around the central part in the outer rim of the marker, with the first three words written around the top, and the last two words written around the bottom (thus not text that are going all the way around in one single line). Inside this rim there are more text on three lines. In the center there is a small cross in a triangle pointing up in relation to the central text. There are more unreadable text below the last line of text and around the inner part of the rim. And off panel voice, which in the next panel turns out to be Cueball, is written above the mark.]
- U.S. Geological survey bench mark
- Elevation above sea 447 feet
- Cueball (off-panel): I love finding these survey markers. It's somehow reassuring.
- [Cueball and Megan are show as they look down on the marker. Cueball has one leg on either side of the marker and Megan stands to the right.]
- Cueball: I like that someone, somewhere, knows where this spot is.
- Cueball: If I stand on it, they know where I am.
- [Cueball and Megan looks up at each other.]
- Megan: But the NAD83 and NAVD88 datums are getting replaced soon. That marker's coordinates could shift by like 5 feet.
- [Megan is looking down at her phone in her hand, standing in the same relation to the marker. But Cueball is now floating in the air behind her 5 feet above the ground, while flailing with his arms and legs (as shown with three small curved lines at the end of either arm and above and below him.]
- Megan: Oh look, it just got updated.
- Cueball: Hey! Put me back!
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