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+--- Thread: Map out a path (/showthread.php?tid=2104)
Map out a path - noitarud - 03-16-2025
[ Moderator comment: In order to avoid copyright problems, I had to remove the images from –for me– unknown sources. I tend to entirely remove this post, as I do not really get the point and phyphox angle, sorry. ]
Would you like to use the accelerometers to plot out the phone’s path? This is for a 2D map, with the device moving on a plane. Of course you can do it for 3D space too, you could perhaps use it to determine how thick a wall is or something. 3d necessary else user tilting will ruin.
When the phone is secured to an object which is moving about, there may be interesting things to see after it is mapped out. The rotation of the phone will have to be factored into the orienteering. I will use the chandler wobble to examplify what users may also find, which is the apparent motion of the earth’s magnetic pole relative to the earth. I have found a number of ways to display it, and users of your app may get the benefit of the depictions for analysing their observations. for this ahplication lets have the phone on a pivot which is parallel with gravity, going around (slow, because the device may be limited to 4g!). There will also be some cumulative error over time (speed, trajectory).
1st depiction: With the phone in rotation, the circumference will need to be resolved to get the plot of the circles. We have the inward reading and the forward reading. initial speeds should be given (will effect the scale), since that is not recorded (defaults: standstill; largest change period; Report the final speed at this setting as a hint), and the forward rate will cumulate on this (presumably it is rise and run from last points, else maybe it is distance away (hypotenuse) and the length of side Opposite or maybe hypotenuse and circumference of the hypotenuse sweep?). The initial trajectory will also need to be given also for the first two points (gap based on initial speed) and each reading will project from the last two.
2nd depiction: To do this on the C.W. I graphed the angle of three points and cumulated it. The result was a downward trend (I added a constant value to straighten it), the C.W. has outward zips.
3: my next idea with the C.W. was to unroll the spiral anticlockwise. The C.W. was one reading per day. The formula for a polygon’s corner angle: A=(S-2)×180÷S. The result was repeating arches (not too interesting).
4: I noticed something peculiar in this and graphed out the speed for both X and Y. (this value subtract last value). This revealed some precession activity, it was drawing another circle, about 433d (i nicknamed it "son of chandler"). My unroll calc is slow so I didn’t bother for too long trying to find a period that would look the best.
5: so I repeat the unroll at 433d and get some concealed data. I presume this is the earth’s crust going about the core (I later thought it was probably going to be a multiple of the moon’s motion, 16×27.33 = 437.3 since there is “orbital resonance”). Shows some oscillations which sometimes die out. I thought the oscillations could be some external influence on the core, moving it about, then leaving it alone. If the mantle gets stirred up then when it is left alone the stirred mantle should act on the core and this causes a phenomenon called gyrostatic precession, which causes the core to tilt. So I predicted when it would tilt again, based on orbits of jupiter and extrapolation of the 2015 data I had, and got August 2018. I was expecting something biggish to happen but here in Australia all that happened was some pilot whales getting beached, one event only (I have not heard of any since… but I don’t always watch the news).
averages are centred, ±24, ±91, ±1195
RE: Map out a path - noitarud - 03-17-2025
to moderator, the first image which was the plotted content from the cw source (IERS), I was the source of the modifications seen in subsequent images. as for the phyphox angle - I don't think I could have described it clearer,
1. use accelerometers to plot a path
2.the depictions discovered from my cw project would help interpret data when it is a rotary observation.
[3. see touchscreen thread]
5b. I had come back bc I forgot to add "second depiction" for result of the second "third depiction"(since you could open or unroll a circle; fifth was really "fourth depiction" again on the result of the second third, not shown).
if it helps I will supply the credit image here too.
As for copyright, I don't really care what people do with my stuff, it was supplied chiefly for purpose of helping others replicate the suggestions, and suggestions can lose their validity if they are not given a real life application.
moderate again if you must (to return above to original or to clean this too). At least /you/ have what I thought should be included.