Physics folks: Please explain to me coordinate transformation and gravity waves in simple terms....

[Mr. Potter]

I listened to a fascinating lecture by Lex Fridman, understood very little although that topic was interesting yet confusing.

 

[Woodpecker]

 

[BobPSU92]

One for me.

 

[PrtLng Lion]

Gravity waves: predicted by Einstein's theory of general relativity. Space and time are a unified fabric called "space-time". Large cosmic events, like the collision/merger of two black holes, create ripples (somewhat analogous to waves in a pond) in the spacetime fabric. Checkout the LIGO systems in Washington (state) and Louisiana designed to detect them.

Coordinate transformation: not sure if this is the same context, but in engineering it was used to relate one frame of reference (or coordinate system) in terms of the other.

 

[s1uggo72]

You should have watched Young Shelton, they discussed that tonight

 

[Catch1lion]

The answer to that question lies somewhere in Amsterdam.

 

[BobPSU92]

You should have watched Young Shelton, they discussed that tonight

Young Shelton? Oh, spit.

 

[step.eng69]

If the poster doesn't understand the following, he has no reason to ask.
Pretty straightforward. Currently, we use NAD 83 in our vertical geometry.
Gravity waves, find a hippie from my generation.
..

Abstract: In 2022, the National Geodetic Survey (NGS) will replace all components of the National Spatial Reference System (NSRS), including NAD 83 and NAVD 88, with a new system that is geocentric, time-dependent, and not reliant upon passive control. Every survey, map or geolocation created today will be incompatible with the new system by as much as 4 meters, depending on where in the United States you are working. This misalignment could apply to every latitude and/or longitude and/or height in your work.

In order to assist users in understanding and adapting to the new system, two technical reports were released by NGS in 2017, under the title “Blueprint for 2022”, with a third, companion report in the works. The first two reports provide the scientific and definitional aspects of four new time-dependent terrestrial reference frames and their companion “geopotential datum” (replacing and expanding upon the historic concept of a “vertical datum”). The third report will focus on the user community and how it can work within this new paradigm of time-dependent geodetic control.

Key Objectives:

• Transform all of their data from NAD 83 / NAVD 88 into the new NSRS
• Understand why time-dependent geodetic control is the only realistic way forward
• Use time-dependent geodetic control

 

[VicVaselino]

If the poster doesn't understand the following, he has no reason to ask.
Pretty straightforward. Currently, we use NAD 83 in our vertical geometry.
Gravity waves, find a hippie from my generation.
..

Abstract: In 2022, the National Geodetic Survey (NGS) will replace all components of the National Spatial Reference System (NSRS), including NAD 83 and NAVD 88, with a new system that is geocentric, time-dependent, and not reliant upon passive control. Every survey, map or geolocation created today will be incompatible with the new system by as much as 4 meters, depending on where in the United States you are working. This misalignment could apply to every latitude and/or longitude and/or height in your work.

In order to assist users in understanding and adapting to the new system, two technical reports were released by NGS in 2017, under the title “Blueprint for 2022”, with a third, companion report in the works. The first two reports provide the scientific and definitional aspects of four new time-dependent terrestrial reference frames and their companion “geopotential datum” (replacing and expanding upon the historic concept of a “vertical datum”). The third report will focus on the user community and how it can work within this new paradigm of time-dependent geodetic control.

Key Objectives:

• Transform all of their data from NAD 83 / NAVD 88 into the new NSRS
• Understand why time-dependent geodetic control is the only realistic way forward
• Use time-dependent geodetic control

Yeah, but everybody knows that.

 

[PSU Mike]

I listened to a fascinating lecture by Lex Fridman, understood very little although that topic was interesting yet confusing.

The dude with the most money gets the hottest chicks. If there’s a tie, the hot chicks go to the guy with the best watch. If there’s still a tie they go to the guy that necessarily wears the loosest pants. It’s what economists call lexicographic preferences.

 

[Catch1lion]

Probably a question better directed towards some really brilliant guy, like a Norman Einstein.

 

[step.eng69]

Isn’t There a French word for that problem?

 

[Catch1lion]

The dude with the most money gets the hottest chicks. If there’s a tie, the hot chicks go to the guy with the best watch. If there’s still a tie they go to the guy that necessarily wears the loosest pants. It’s what economists call lexicographic preferences.

Don't forget expensive shoes. Chicks love guys with expensive shoes.

 

[Woodpecker]

Isn’t There a French word for that problem?

 

[Nitt1300]

Don't forget expensive shoes. Chicks love guys with expensive shoes.