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"Assume you have last GPS coordinates in gps_old_x, gps_old_y, new GPS position in gps_new_x, gps_new_y, and the movement IMU thinks happened between the two GPS measurements, imu_x, imu_y. How do...

@ Nominal Animal : I downloaded Python and PyQt4 ..... where am I to run your code? .... in Python or PyQt4? (Python says "can't find module")

"Should we start a new thread, "shrinking a concave polygon"? - NA

.... Yes! That would be great! .... but it must cover both a mix of convex and concave.


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"You don't need to...

@Nominal Animal Thank-you!

I will be ordering the GPS module and the IMU module soon with an RF module linked back to my pc.

Up to this point I was just pondering if both modules could be...

Thank you so much Nominal Animal !


Only now am I getting to understand your method! (I'm sorry, ... you do have the patience of a saint in deed!) : )



What is troubling me with your...

Thank you for your thoughts on this Nominal Animal! "Is this any better?" .... yes! ......but I'm confused!

Let me ask you this,

You do realize the IMU has NO ability to acquire a "fix" on...

..... the IMU lives for only one second at a time .... the app uses the summation XY as its working coordinates.

GPS XY difference IMU XY = working XY coordinate

Question:

I'm now thinking maybe a kalman is not what is needed. Both location streams are fully matured to their best guess.

Lets say at every second the GPS offers its best guess and the IMU...

The VN-200 incorporates the latest advancements in Aerospace grade Kalman filter inertial navigation algorithms specifically tailored to solve problems typically faced by industrial users.Industrial...

@Nominal Animal: "What you need is a Kalman filter which uses location, acceleration, and angular acceleration as inputs, and provides at minimum the (filtered) location (but due to physics, it will...

Hi!

I want to input two location data output streams (X,Y from GPS) and (X,Y from a nine axis composite data gyro+accelerometer+compass) into this Kalman filter.
The objective here is to have the...

agreed! .... and thank you! : )

"You really should consider the big picture and real-world use cases before delving into the details like point-in-polygon testing, in my opinion."

... I disagree! The simplistic method of...

"How accurate are the GPS units you'll use for local measurements?"

<3ft @ (hot start) <1ft after 10min (running with an on chip precision point position algorithm)

"Sure. You'd need to create a polygon, say a small rectangle, where the dog is allowed to exit." .....I take it that to add this new polygon, you would require the homeowner to manually edit the c...

@Nominal Animal:

I'm sorry for your frustration! : ( ... this was not my intent. Your very creative ideas have been most helpful. I never expected that you would have
proposed an entirely new...

"4) The neighbors kid wanders inside the perimeter, and your dog bites him/her. There is no physical barrier, so your dog could be legally construed as an "attractive nuisance".

OK!

"3) The rogue pit bull of the neighborhood, who has no zapper collar on, walks right through the perimeter, and kills your dog"

...... yea?? ...... whats your point here?

"2) The dog spies the neighbors cat, squirrel, or another dog, and charges right through the perimeter - zap, what zap?."

.... that will be the last time he does it! : )

"1) The power goes off, and now the dog is running free"

... you mean battery in this case I think, ....no! , most dogs after a few learning ZAP's never challenge the fence again. Its all in...

COST?? .... well .... in my RFID version of this system, the cost and size have dropped low enough to make entry into the general consumer market. The entire reader (mounted on dogs collar) in now...

"Not for those large properties." ......... ??????? you lost me here! : (

..... In a premium version, I could attach a wifi module that would assist in the fence boundary set-up .... eliminating any physical external programming buttons needed on the unit itself (think of...

....... of course you could include the house itself in the front yard only poly by plotting all the corners of the house as well and making choking off points to any side yard paths out of the front...

"The green area is defined by 17 points .... "

This looks like your method requires the homeowner (during set-up) to record his primary yard points (polygon) offseted 3-4ft (warning buffer) from...