The discussion centers on the impact of oil extraction on Earth's rotation. Participants assert that while oil removal creates cavities, the mass of oil extracted is negligible compared to Earth's total mass, making any rotational effects imperceptible. They highlight that geological factors, such as tectonic plate movements and variations in Earth's crust density, have a far more significant influence on rotation. The consensus is that while oil extraction does theoretically affect Earth's moment of inertia, the practical implications are minimal, with changes in rotation measured in microseconds.
PREREQUISITESGeophysicists, environmental scientists, and anyone interested in the interplay between natural resource extraction and planetary dynamics will benefit from this discussion.
jim mcnamara said:Lastly, do you know of any concrete observations that support your claim?
Gedanken said:shouldn't that affect Earth's rotation on its axis?
Okay by me. Let's wait and see.davenn said:I don't really think he/she is making a claim/personal theory
backspace said:I like that the system is designed with "fuzzy" information
jim mcnamara said:I do not see a discussion of a fuzzy signal
the Trimble article said:Intentional Errors!
As hard as it may be to believe, the same government that spent $12 billion to develop the most accurate navigation system in the world intentionally degraded its accuracy. The policy was called "Selective Availability" or "SA" and the idea behind it was to make sure that no hostile force or terrorist group can use GPS to make accurate weapons.
Basically the DoD introduced some "noise" into the satellite's clock data which, in turn, added noise (or inaccuracy) into position calculations. The DoD may have also been sending slightly erroneous orbital data to the satellites which they transmitted back to receivers on the ground as part of a status message.
Together these factors made SA the biggest single source of inaccuracy in the system. Military receivers used a decryption key to remove the SA errors and so they're much more accurate.
Turning Off Selective Availability
On May 1, 2000 the White House announced a decision to discontinue the intentional degradation of the GPS signals to the public beginning at midnight. Civilian users of GPS are now able to pinpoint locations up to ten times more accurately. As part of the 1996 Presidential Decision Directive goals for GPS, President Clinton committed to discontinuing the use of SA by 2006. The announcement came six years ahead of schedule. The decision to discontinue SA was the latest measure in an on-going effort to make GPS more responsive to civil and commercial users worldwide.
jim mcnamara said:Yes. I do not see that SA is active. And you are right it is mentioned. I originally thought you meant the article implied SA was still up. My bad. @rbelli1
DaveIn GPS technology, the term "COCOM Limits" also refers to a limit placed on GPS tracking devices that disables tracking when the device calculates that it is moving faster than 1,000 knots (1,900 km/h; 1,200 mph) at an altitude higher than 18,000 m (59,000 ft).[2] This was intended to prevent the use of GPS in intercontinental ballistic missile-like applications.
Some manufacturers apply this limit only when both speed and altitude limits are reached, while other manufacturers disable tracking when either limit is reached. In the latter case, this causes some devices to refuse to operate in very high altitude balloons.[3]
I would expect the reservoir to be backfilled with water to assist in the removal of the oil. If not, ground water would be expected to flow into the area from which hydrocarbons were removed. Since the density of water is greater than the oil or gas, the mass of the reservoir may actually increase.Gedanken said:When oil is taken from the ground, it leaves a cavity that doesn't get backfilled.