Before GPS, how did surveyors establish control and tie in to the geodetic datum?

Also, on projects where GPS cant such as heavily wooded areas, how is control established to ensure accuracy? Are assumed coordinates used?

πŸ‘︎ 28
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πŸ‘€︎ u/andrewerdna100
πŸ“…︎ Feb 28 2021
🚨︎ report
ELI5, vertical datums (geodetic), like Amsterdam's NAP.

How did people understand and establish this in the 1600s?

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πŸ‘€︎ u/JoeWegs
πŸ“…︎ Jul 10 2018
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What are Geodetic Datums? monde-geospatial.com/what…
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πŸ‘€︎ u/monde-geospatial
πŸ“…︎ Apr 02 2015
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Where is PoGo-CN? A technical analysis of the challenges created by Chinese mapping laws

Every once in a while, we hear some news of Niantic or the Pokemon Company doing some legal maneuvers in China to facilitate the eventual launch of Pokemon Go there....and yet it hasn't happened in 4 years. So....what's up? This is a post detailing the technical issues surrounding ONE particular aspect of Chinese law --mapping laws-- which in my opinion, create the some of the greatest technical and financial challenges for Niantic.

ATTENTION: Both Chinese law and the politics surrounding China can be touchy subjects. Discussing Chinese politics is NOT the purpose of this post. Instead, I will only discuss ESTABLISHED Chinese law with minimal references to the political implications of said laws. That said, I have only a passing familiarity with Chinese law and I do not claim area expertise in all of the technical details I present here. You have been warned.

Chinese mapping law

In a nutshell, the Chinese government prohibits the publication of geographical data about its territorial land, water, and air. The operant word here is "publish" -- to publish map data means to make it publicly available. That means no unauthorized creation/publishing of maps/map data or geotagging of certain items (notably photos).

In short, any application or venture that tries to create a publicly accessible map of China is going to run into legal trouble (to the tune of heavy fines). Things like OpenStreetMaps (basically, crowdsourced Google maps) and camera makers that geotag photos have run into trouble in the past.

Practically all the basic functions of PoGo break these laws. From the position of spawn points (arbitrarily chosen, but fixed-point locations that are broadcast by Niantic servers to everyone's phones) to the location/photos of PokeStops (again, broadcast by Niantic servers), to the location of the player's avatar (not broadcast, but locally available for all devices and to Niantic themselves), Pokemon Go is one giant exercise in violation of Chinese mapping laws. And of course, the recently launched AR scan feature is a huge no-no.

Obviously, though, it's not like China is completely without maps. There exist a small number of Chinese companies with the authority from the government to create maps of China. So Niantic basically has to collaborate with one of these companies. But before I get into what this collaboration would entail, I'll give a quick primer on how global positioning works.

Fundamentals of global positioning systems

The way

... keep reading on reddit ➑

πŸ‘︎ 274
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πŸ‘€︎ u/EmrysX77
πŸ“…︎ Nov 25 2020
🚨︎ report
The Truth About Coordinates (And Floating Points) (crosspost)
πŸ‘︎ 106
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πŸ‘€︎ u/AlloyIX
πŸ“…︎ May 19 2020
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What is a datum?

I’m a first year arch student and this might be a dumb question but I’ve read so many definitions of datum and i still don’t get it. Are there any examples that i can look at to understand it easier? Thank you in advance :)

πŸ‘︎ 2
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πŸ‘€︎ u/whereisgoose
πŸ“…︎ Oct 17 2020
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Google Earth does this for some reason
πŸ‘︎ 273
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πŸ‘€︎ u/notowa
πŸ“…︎ Feb 07 2020
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What do you call a man with no arms or legs in a hole?

Phil

πŸ‘︎ 5k
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πŸ‘€︎ u/Rumblebully
πŸ“…︎ Jun 30 2021
🚨︎ report
06-Sep-2020 Update: 56,786 new test (20,947 from first-timers), 2,564 new cases, 12.23% first-timers positivity, 5.97% FDoH-reported positivity, 114 hospitalizations, 38 deaths

u/Ishkoten is still taking care of some personal business, so I am filling in for him once again. Some of the metrics below will be different than what Ishkoten usually posts because I am inherently lazy currently visiting family and cannot dig through the PDF reports right now. Most of the numbers posted here have been automatically scraped from the FDoH’s ArcGIS platform (which feeds the official Covid-19 Dashboard) and from the FDoH Case Line Data. These numbers often vary slightly from what you will find in the PDF reports; they should not vary at all, but… welcome to Florida!

Today’s data shows a total of 56,786 new test results from both state-operated and privately-operated labs. 3,768 of those results are positive and 53,018 are negative. 20,947 of the results are from first- timers* while 35,839 are from people who were tested at least one other time in the past (excluding the previously mentioned first-timers). 6,402 of the retests are results (positive and negative) from people who have previously tested positive; these results are excluded from the FDoH’s positivity calculation.

The data shows 2,564 new cases (2,513 residents & 51 non-residents) with a calculated positivity of 12.23% from 20,947 tests (first-timers). The FDoH reports a positivity of 5.97% from 63,188 tests which may include people who have previously tested negative, but NOT people who previously tested positive. The average age (mean) of the new cases reported today is 36. There were 162 covid-positive emergency department visits reported today (160 residents & 2 non-residents) and 114 new hospital admissions (112 residents & 2 non-residents). Finally, there were 38 new deaths reported (38 residents & 0 non-residents).

* β€œFirst-timers” are people who have tested positive for the very first time (though they may have tested negative in the past) along with people who were tested for the very first time with negative results.

Summary

  • New Test Results: 56,786
  • First-timers: 20,947
  • Retests: 35,839
  • New Cases: 2,564
  • Positivity (1st Timers): 12.23%
  • Positivity (Labs): 6.64%
  • Positivity (FDoH): 5.97%
  • New ED Visits: 162
  • New Hospital Admissions: 114
  • New Deaths: 38

Age Data (All Time)

  • Average Case Age: 42
  • Average ED Visit Age: 53
  • Average Hospitalization Age: 63
  • Average Death Age: 77
  • Youngest Death: 6
  • Oldest Death: 108

Useful Links

  • [FDoH State Report](http://ww11.doh.state.fl.us/comm/_part
... keep reading on reddit ➑

πŸ‘︎ 110
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πŸ‘€︎ u/ScottAllyn
πŸ“…︎ Sep 06 2020
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Did you know Bruce Lee has a faster older brother?

Sudden Lee

πŸ‘︎ 9k
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πŸ“…︎ Jul 02 2021
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DAD JOKES ARE NOT DIRTY.

Go post NSFW jokes somewhere else. If I can't tell my kids this joke, then it is not a DAD JOKE.

If you feel it's appropriate to share NSFW jokes with your kids, that's on you. But a real, true dad joke should work for anyone's kid.

Mods... If you exist... Please, stop this madness. Rule #6 should simply not allow NSFW or (wtf) NSFL tags. Also, remember that MINORS browse this subreddit too? Why put that in rule #6, then allow NSFW???

Please consider changing rule #6. I love this sub, but the recent influx of NSFW tagged posts that get all the upvotes, just seem wrong when there are good solid DAD jokes being overlooked because of them.

Thank you,

A Dad.

πŸ‘︎ 11k
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πŸ‘€︎ u/Von_Bostaph
πŸ“…︎ Jun 18 2021
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I'd ruther not say
πŸ‘︎ 10k
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πŸ‘€︎ u/Un_FaZed211
πŸ“…︎ Jul 01 2021
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I've asked so many people what LGBTQ stands for

So far nobody has given me a straight answer

πŸ‘︎ 6k
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πŸ“…︎ Jul 04 2021
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Rational
πŸ‘︎ 8k
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πŸ‘€︎ u/mainhoonmadrasi
πŸ“…︎ Jun 30 2021
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If the sea level rises, does the altitude of everything decreases ?
πŸ‘︎ 11k
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πŸ‘€︎ u/zenef
πŸ“…︎ Sep 30 2017
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My wife blocked me on Facebook because I post too many bird puns.

Well, toucan play at that game.

πŸ‘︎ 9k
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πŸ‘€︎ u/Zayan-ali
πŸ“…︎ Jun 30 2021
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If Apple made a car what would it be missing?

Windows

πŸ‘︎ 2k
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πŸ‘€︎ u/Moplex1234
πŸ“…︎ Jul 02 2021
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There are only two white people in the movie Black Panther

Martin Freeman, and Andy Serkis.

They also play roles in Lord of the Rings.

I guess that makes them the Tolkien white guys.

πŸ‘︎ 12k
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πŸ‘€︎ u/jzagri
πŸ“…︎ Jun 24 2021
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My 3 yr old daughter made her first pun today and I almost cried. She was eating an apple and I asked her if she liked apples.

She said apple-lutely

πŸ‘︎ 12k
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πŸ“…︎ Jun 29 2021
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"ground" the kid
πŸ‘︎ 5k
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πŸ‘€︎ u/freakynit
πŸ“…︎ Jul 03 2021
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What did the left eye say to the right eye when they got married?

'Eye-do'

This is my first post pls don't kill me lol.

The people in the comment section is why I love this subreddit!!

Cred once again my sis wants credit lol

πŸ‘︎ 6k
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πŸ‘€︎ u/tieyz
πŸ“…︎ Jun 27 2021
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Proud dad moment.

Keep in mind, my son is 4 years old, so everything is an original to him.

I had to work late into the evening yesterday, and he was just going to bed when I got home. I had left home for the office nearly 14 hours prior, had a long day, lots of meetings, traffic, etc.

When I walked through the door, I was exhausted, run down, and starving. My wife hugged me and asked how my day was, and I replied, "Done. It was a good day, but has got me exhausted. I just want to grab a bite and go to bed. I'm hungry."

From my son's bedroom, I hear him shout, "Hi Hungry! Nice to meet you!"

Not only did it make me laugh, but I completely forgot about how hungry and tired I was. I went to his bedroom, and we laughed together about it. It was exactly what I needed.

Edit: Thanks for all the awards, kind strangers! I'll let my son know y'all enjoyed his joke too!

πŸ‘︎ 7k
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πŸ‘€︎ u/LaBarbaGuapa
πŸ“…︎ Jul 01 2021
🚨︎ report
What was a very common name in the middle ages?

I heard parents named their children lance a lot.

First post please don't kill me

Edit: i went to sleep and now my inbox is dead, thank you kind strangers for the awards!

πŸ‘︎ 9k
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πŸ“…︎ Jun 24 2021
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Apologies if it's a bit corn-y
πŸ‘︎ 3k
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πŸ‘€︎ u/mediashiznaks
πŸ“…︎ Jun 26 2021
🚨︎ report
Gottemm
πŸ‘︎ 8k
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πŸ‘€︎ u/Un_FaZed211
πŸ“…︎ Jun 29 2021
🚨︎ report
What pan is the best to make sushi in?

Japan.

πŸ‘︎ 6k
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πŸ‘€︎ u/Most-Stomach4240
πŸ“…︎ Jul 01 2021
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so many choices
πŸ‘︎ 5k
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πŸ‘€︎ u/SailorNebula
πŸ“…︎ Jun 07 2021
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Well that didn't cross my mind
πŸ‘︎ 6k
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πŸ‘€︎ u/JasonPetreasCoach
πŸ“…︎ Jun 11 2021
🚨︎ report
I said to my wife, "I need to call the doctor today." Concerned, she asked, "Which doctor?"

"No, the regular kind!" I laughed.

πŸ‘︎ 8k
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πŸ‘€︎ u/808gecko808
πŸ“…︎ Jul 03 2021
🚨︎ report
He knows too much
πŸ‘︎ 6k
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πŸ‘€︎ u/Potato_salad123
πŸ“…︎ Jun 24 2021
🚨︎ report
where do pirates get their hooks?

second hand stores!

πŸ‘︎ 7k
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πŸ‘€︎ u/bigus-_-dickus
πŸ“…︎ Jun 25 2021
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I've just deleted all the German names off my pre owned iPhone..

it's Hans free now..

πŸ‘︎ 7k
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πŸ‘€︎ u/HugoZHackenbush2
πŸ“…︎ Jun 28 2021
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My 6 year old wanted me to share his joke with you all. What is a horses favorite store?

Old Neeeeiiiiighvy

πŸ‘︎ 9k
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πŸ‘€︎ u/WantedDadorAlive
πŸ“…︎ Jun 28 2021
🚨︎ report
I've spent all morning trying to think of a quality pun, just to come up with THIS otter rubbish.
πŸ‘︎ 3k
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πŸ‘€︎ u/awesome_smokey
πŸ“…︎ Jun 28 2021
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3.14159265387279 snek
πŸ‘︎ 4k
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πŸ“…︎ Jun 20 2021
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Did you know 10+10 and 11+11 are the same?

10+10 is twenty and 11+11 is twenty too

πŸ‘︎ 5k
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πŸ“…︎ Jun 27 2021
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Rock bottom
πŸ‘︎ 4k
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πŸ‘€︎ u/Theo19555
πŸ“…︎ Jun 23 2021
🚨︎ report
How much does it cost for a pirate to get his ears pierced?

A buck-an-ear!

I Thank ye kind Matey for the booty! I be truly overwhelmed! Thank you!

Holy cow! Thank you everyone for the upvotes and awards! I wasn’t expecting this!

πŸ‘︎ 6k
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πŸ‘€︎ u/motherduck5
πŸ“…︎ Jun 25 2021
🚨︎ report
My Son Ate a Bunch of Scrabble Tiles. My Wife is Scared but I'm not...

He should have a good vowel movement. His next diaper change could spell disaster though.

πŸ‘︎ 8k
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πŸ‘€︎ u/hypeaze
πŸ“…︎ Jun 23 2021
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I never really understood why it was spelled: camouflage

and not:

πŸ‘︎ 4k
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πŸ‘€︎ u/professorf
πŸ“…︎ Jul 01 2021
🚨︎ report
Chinese takeout: $11.77. Price of gas to get there: $3.00

Making it all the way home and realizing that they forgot one of the containers:

Riceless

πŸ‘︎ 5k
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πŸ“…︎ Jun 28 2021
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Two drunk guys were about to get into a brawl. One of the guys grabs a stick and draws a line in the dirt and says "If you cross this line, I'll hit you in the face"

That was the punchline

πŸ‘︎ 10k
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πŸ“…︎ Jun 29 2021
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I threw up in the toilet
πŸ‘︎ 3k
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πŸ“…︎ Jun 25 2021
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My Mexican friend takes anti-anxiety medication

It’s for Hispanic attacks

πŸ‘︎ 4k
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πŸ‘€︎ u/monolocomotive
πŸ“…︎ Jul 01 2021
🚨︎ report
Hot
πŸ‘︎ 6k
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πŸ‘€︎ u/AlexxFruit
πŸ“…︎ Jun 22 2021
🚨︎ report
Saw this on insta @PunHubOnline
πŸ‘︎ 5k
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πŸ‘€︎ u/Haidi7
πŸ“…︎ Jun 26 2021
🚨︎ report
05-Sep-2020 Update: 70,024 new tests (23,804 from previously untested persons), 3,656 new cases, 15.36% "new individuals" positivity, 5.97% FDoH-reported positivity, 246 hospitalizations, 60 deaths

u/Ishkoten is taking care of some personal business today, so I am filling in for him. Some of the metrics below will be different than what Ishkoten usually posts because I am inherently lazy currently at work and cannot dig through the PDF reports right now. Most of the numbers posted here have been automatically scraped from the FDoH’s ArcGIS platform (which feeds the official Covid-19 Dashboard) and from the FDoH Case Line Data. These numbers often vary slightly from what you will find in the PDF reports; they should not vary at all, but… welcome to Florida!

Today’s data shows a total of 70,024 new test results from both state-operated and privately-operated labs. Of those, 5,632 results are positive and 64,392 are negative. 23,804 of the results are from people who were tested for the very first time (or became a new case), while 46,220 are from people who were tested at least one other time in the past (aka retests). 6,836 of the retests are results (positive and negative) from people who have previously tested positive; these results are excluded from the FDoH’s positivity calculation.

The data shows 3,656 new cases (3,593 residents & 63 non-residents) with a calculated positivity of 15.36% from 23,804 tests (previously untested persons). The FDoH reports a positivity of 5.97% from 63,188 tests which may include people who have previously tested negative, but NOT people who previously tested positive. The average age (mean) of the new cases reported today is 39. There were 347 covid-positive emergency department visits reported today (346 residents & 1 non-residents) and 246 new hospital admissions (245 residents & 1 non-resident). Finally, there were 60 new deaths reported (61 residents & -1 non-residents).

Summary

  • New Test Results: 70,024
  • Previously Untested Persons: 23,804
  • Retests: 46,220
  • New Cases: 3,656
  • Positivity (1st Timers): 15.36%
  • Positivity (Labs): 8.04%
  • Positivity (FDoH): 5.97%
  • New ED Visits: 347
  • New Hospital Admissions: 246
  • New Deaths: 60

Age Data (All Time)

  • Average Case Age: 42
  • Average ED Visit Age: 53
  • Average Hospitalization Age: 63
  • Average Death Age: 77
  • Youngest Death: 6
  • Oldest Death: 108

Useful Links

... keep reading on reddit ➑

πŸ‘︎ 116
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πŸ‘€︎ u/ScottAllyn
πŸ“…︎ Sep 05 2020
🚨︎ report
08-Sep-2020 Update: 40,893 new test results (15,196 from first-timers), 1,823 new cases, 12.00% first-timers positivity, 4.96% FDoH-reported positivity, 114 hospitalizations, 44 deaths

u/Ishkoten is still taking care of some personal business, so I am filling in for him; he should be back tomorrow. Some of the metrics below will be different than what Ishkoten usually posts because I am inherently lazy currently at work and unable to dig through the pdf reports. Most of the numbers posted here have been automatically scraped from the FDoH’s ArcGIS platform (which feeds the official Covid-19 Dashboard) and from the FDoH Case Line Data. These numbers often vary slightly from what you will find in the PDF reports; they should not vary at all, but… welcome to Florida!

Today’s data shows a total of 40,893 new test results from both state-operated and privately-operated labs. 2,786 of those results are positive and 38,107 are negative. 15,196 of the results are from first- timers* while 25,697 are from people who were tested at least one other time in the past (excluding the previously mentioned first-timers).

The data shows 1,823 new cases (1,797 residents & 26 non-residents) with a calculated positivity of 12.00% from 15,196 tests (first-timers). The FDoH reports a positivity of 4.96%; unfortunately, they are no longer updating the raw numbers used for this calculation (the numbers on Testing page of the Official Dashboard are days old). The average age (mean) of the new cases reported today is 41. There were 171 covid-positive emergency department visits reported today (170 residents & 1 non-resident) and 114 new hospital admissions (112 residents & 2 non-residents). Finally, there were 44 new deaths reported (44 residents & 0 non-residents).

* β€œFirst-timers” are people who have tested positive for the very first time (though they may have tested negative in the past) along with people who were tested for the very first time with negative results.

Summary

  • New Test Results: 40,893
  • First-timers: 15,196
  • Retests: 25,697
  • New Cases: 1,823
  • Positivity (1st Timers): 12.00%
  • Positivity (Labs): 6.81%
  • Positivity (FDoH): 4.96%
  • New ED Visits: 171
  • New Hospital Admissions: 114
  • New Deaths: 44

Age Data (All Time)

  • Average Case Age: 42
  • Average ED Visit Age: 53
  • Average Hospitalization Age: 63
  • Average Death Age: 77
  • Youngest Death: 6
  • Oldest Death: 108

Useful Links

  • πŸ“ FDoH State Report (PDF)
  • πŸ“ [FDoH County Report](http://ww11.doh.state.fl.us/comm/_partners/covid19_report_archive/county_report
... keep reading on reddit ➑

πŸ‘︎ 65
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πŸ‘€︎ u/ScottAllyn
πŸ“…︎ Sep 08 2020
🚨︎ report

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