Treading LL P-1 for 100M TF

[c10ck3r]

Originally Posted by kracker

Sounds like your homework, for some reason.

If it was homework, I'd have put it in "Homework Help"
I'm running a planter using GPS and need an exact heading to orient the plots correctly. The feed from the tractor only gives a heading for the current past 5 feet and only gives it to one decimal place. I'd be using it after the first pass to establish an AB line, which is why I need it to be longer, since (for example) today's plot is 980 feet deep and 320 feet wide, right about 7.2 acres.

[chalsall]

Originally Posted by c10ck3r

I'm running a planter using GPS and need an exact heading to orient the plots correctly.

Can the iPhone run Perl? And/or, is there EDGE cellular coverage where you're working (which would allow "outsourcing" the needed processing to an Internet server)?

The reason I ask is this Perl module has just about everything you need.

[Xyzzy]

Apple really does not want any code other than "approved" code running on an IOS device.



We program a little on our iPhone and iPad with this app:

https://itunes.apple.com/us/app/codetogo/id382677229

All it does is offloads the compilation and execution to a different device. It is limited but it is okay for simple stuff. It requires an Internet connection to run the code but you can edit, load and save without a connection.

[lycorn]

Originally Posted by Uncwilly

Aramis has been MIA since then. His twitter is not a very active account. Has he logged in since then?

According to his public profile->statistics, the last activity was on May 20th.

[davieddy]

Originally Posted by chalsall

Would the curvature of the earth be required to be considered?

The start and finish positions define a plane through the centre of the earth.
The heading is the angle between this plane and the plane of longitude at the time you want the heading.

If you were to consider starting and finishing at different distances from the centre of the earth, this would entail a small correction.

Euler

[davieddy]

Originally Posted by c10ck3r

Not sure if this is the right place to put this, but...
I'd be willing to do 2.5 Thz-Days of GPU TF (your choice of range) for an iPhone app to get my exact heading by entering my start coordinates and end coordinates. Needs to allow 9 decimal places for my entries. format would be
Lat (ie) 37.981234432
Long -97.782435987
End Lat 37.983462697
End Long -97.789436899
Would need heading to 6 places, 0 to 359.999999

On this scale the computation is childishly simple:

NS distance is difference in latitude * 2piR/360
EW distance is difference in longitude * 2piRcos(laitude)/360

D

[chalsall]

Originally Posted by chalsall

And/or, is there EDGE cellular coverage where you're working (which would allow "outsourcing" the needed processing to an Internet server)?

Is this useful to you? If so, 2.5 THz-Days of GPU TF of "What Makes Sense" to 74 in the LL range would be great!

Let me know if you'd prefer feet rather than meters.

[c10ck3r]

Originally Posted by chalsall

Is this useful to you? If so, 2.5 THz-Days of GPU TF of "What Makes Sense" to 74 in the LL range would be great!

Let me know if you'd prefer feet rather than meters.

Indeed it will be! Thank you so much! I will reserve the batch momentarily!

[chalsall]

Originally Posted by c10ck3r

Indeed it will be! Thank you so much! I will reserve the batch momentarily!

You are most welcome -- it took me all of half an hour (I love Perl, and the diverse range of modules available). BTW, it's currently using the NAD27 ellipsoid; let me know if you'd prefer another (like WGS72, WGS84, etc).

And thanks for the TFing.

[chalsall]

Originally Posted by chalsall

BTW, it's currently using the NAD27 ellipsoid; let me know if you'd prefer another (like WGS72, WGS84, etc).

During a very hectic day, a couple of things popped into my head about this... First, it would be highly advisable to use the same ellipsoid that your GPS is using. It's less than a minute for me to set it to be anything you'd like.

Secondly, are you using Differential GPS (or military grade)? Otherwise you're going to have much greater varation in your data feed than three inches....

[davieddy]

Originally Posted by c10ck3r

Indeed it will be! Thank you so much! I will reserve the batch momentarily!

Love you Clocker!
But do what actually makes sense.
TF 63M+ to 73.
I promise Chris will be grateful when the LL tsunami hits the fan.

D