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Speedtrap Alert for Android (Split from CamerAlert Thread re
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Leo_A
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Joined: Jan 10, 2017
Posts: 146

PostPosted: Sat Jan 11, 2020 7:06 pm    Post subject: Reply with quote

Kremmen wrote:
What I've noticed is that I always get an advance warning for Specs. I'm set for just 1 second but typically it's 3 to 5 seconds.

If the distance to a camera is less than 220 yd (200 meters), "time to camera" setting is ignored. Perhaps, that's why you're getting 3-5 seconds alert.

Kremmen wrote:

However, every end specs always tells me - after I've just passed the camera.

"just passed the camera" is the special part of the app algorithm. Geolocations are discrete with the interval of 1 second. If previous location was before the cam and current location is after and the cam is closer than 30 meters to the line connecting these two locations, then the app triggers an event "just passed". This event initiates and stops av .calc. Though there are some other events that stop av. calc, but only "just passed" initiates.
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Leo_A
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PostPosted: Sat Jan 11, 2020 7:08 pm    Post subject: Reply with quote

M8TJT wrote:
I don't think these would need an advanced warning, just an "End of average speed zone" announcement as at present. Same for ENDSPECS would be my preference.

Yes, only "end of av. speed zone". Nothing else.
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M8TJT
The Other Tired Old Man
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Joined: Apr 04, 2006
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PostPosted: Sun Jan 12, 2020 12:25 am    Post subject: Reply with quote

Thanks Leo. I must get my Mock Locations running against my test SPECS then. Laughing
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Kremmen
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Posts: 7037
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PostPosted: Sun Jan 12, 2020 6:11 am    Post subject: Reply with quote

All good stuff Smile

I've always run my camera devices with 15 secs for first alert and 6 secs for any subsequent overspeed warning.

Those 2 timings were taken from my first device, a Talex, and I found those distances to be perfect for me.

With Specs I don't see the point of that much warning as you don't get clocked until the second camera so just a few secs warning to slow down I consider sufficient.
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DennisN
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PostPosted: Sun Jan 12, 2020 1:04 pm    Post subject: Reply with quote

DennisN wrote:
MaFt wrote:
DennisN wrote:
I believe that Exitspecs 191814/815/816 are all wrongly placed and come well within the normal arcs of tolerance to cancel main carrigeway running.

I've tweaked 191814
191815 has a direction of 270 degrees so will not affect the main carriageway
191816 has a direction of 10 degrees so will not affect the main carriageway

I remain sceptical. I would have only placed two exitspecs :

51.43339,-0.86205 Heading 320
51.42928,-0.84661 Heading 112

If 191814 and 815 are (after tweaking) "correct", why is my CA discontinuing warnings and calculation as I drive between approx 51.43463,-0.84824 until specs 198459?

My settings are :-
Default Range 30 seconds
Warning cone 45 degrees
Warning sensitivity 50
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Oldboy
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PostPosted: Sun Jan 12, 2020 6:20 pm    Post subject: Reply with quote

DennisN wrote:

My settings are :-
Default Range 30 seconds
Warning cone 45 degrees
Warning sensitivity 50

On my Android I also have 'Direction difference (degrees)', that is set to 28.

If this is too large, it can trigger false alerts.

I'm presuming that Apple phones have this setting also.
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DennisN
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PostPosted: Sun Jan 12, 2020 7:44 pm    Post subject: Reply with quote

That’s what is the Warning cone (degrees difference from my heading) and is why I reported it. According to the user manual, a ‘normal ‘ setting would be half way along the setting bar, guessing 50, but if it were half a right angle , it would be 45. Either 45 or 50 gets 191815 and 816 inside the main carriageway cone I guess. That’s why I think those particular Exitspecs should be better positioned.

All three of the settings can trigger false alerts of course. I’m OK with false alerts, but I don’t want false Exitspecs.
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If it tastes good - it's fattening.

Two of them are obesiting!!
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MaFt
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Joined: Aug 31, 2005
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PostPosted: Mon Jan 13, 2020 10:13 pm    Post subject: Reply with quote

DennisN wrote:
DennisN wrote:
MaFt wrote:
DennisN wrote:
I believe that Exitspecs 191814/815/816 are all wrongly placed and come well within the normal arcs of tolerance to cancel main carrigeway running.

I've tweaked 191814
191815 has a direction of 270 degrees so will not affect the main carriageway
191816 has a direction of 10 degrees so will not affect the main carriageway

I remain sceptical. I would have only placed two exitspecs :

51.43339,-0.86205 Heading 320
51.42928,-0.84661 Heading 112

If 191814 and 815 are (after tweaking) "correct", why is my CA discontinuing warnings and calculation as I drive between approx 51.43463,-0.84824 until specs 198459?

My settings are :-
Default Range 30 seconds
Warning cone 45 degrees
Warning sensitivity 50


In 'Manage Cameras' does it show anything for 'My Cameras' or 'Cameras on Device' (sorry, can't receall the exact phrase used). I'm wondering if you are getting the alerts stopping or starting due to cameras you have submitted that are still on your device.
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Leo_A
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Joined: Jan 10, 2017
Posts: 146

PostPosted: Mon Jan 13, 2020 10:23 pm    Post subject: Reply with quote

These SPECS are not mistakes?
SPECS:196206@40
SPECS:199924@40

Where it is better to ask such questions? Submission page, field 'Details & description' is ok to write there and sent entry then?

Another thing I noticed - there are forgotten EXITSPECS present in the database. Av. zone most likely was removed, but EXITSPECS remained.
52.35318,-2.06819
52.33193,-2.04987
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DennisN
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PostPosted: Mon Jan 13, 2020 10:39 pm    Post subject: Reply with quote

MaFt, there’s nothing in “my cameras” and “my reports”.
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M8TJT
The Other Tired Old Man
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PostPosted: Tue Jan 14, 2020 9:44 am    Post subject: Reply with quote

@Leo_a @MaFt
Re the two 40MPH SPECS. They probably are and there are 'remove requests' for both of them. Neither of them have got 'mates' and one is a Start with no End and the other is an End with no Start.
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westcatford
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PostPosted: Tue Jan 14, 2020 12:41 pm    Post subject: Reply with quote

[quote="Oldboy"][quote="DennisN"]
My settings are :-
Default Range 30 seconds
Warning cone 45 degrees
Warning sensitivity 50[/quote]
On my Android I also have 'Direction difference (degrees)', that is set to 28.

If this is too large, it can trigger false alerts.

I'm presuming that Apple phones have this setting also.[/quote]

Forgive my piggerance, but is there a 'warning cone' or 'direction difference' setting in STA? If there is, I can't find it and, having just done my first major test of STA on a 500 mile round trip, it's the one feature I really needed: I was picking up a number of warnings from cameras etc which were clearly not of a type or speed for the road that I was on.

I am aware of, and use successfully, these settings in CA.
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M8TJT
The Other Tired Old Man
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PostPosted: Tue Jan 14, 2020 4:19 pm    Post subject: Reply with quote

westcatford wrote:
Forgive my piggerance, but is there a 'warning cone' or 'direction difference' setting in STA?
No.
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Leo_A
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PostPosted: Tue Jan 14, 2020 9:41 pm    Post subject: Reply with quote

westcatford wrote:
but is there a 'warning cone' or 'direction difference' setting in STA?.


No.

Direction difference - 30 degrees initially and 45 degrees when a camera is captured (for better retention at lower speeds when car direction is jumping).

Warning cone - no constant cone, there is a little different algorithm. When we have a point on the surface and associated direction, it is possible to draw a line. The app 'draws' such line for a camera and calculates deviation of the car location from the line. Value of the deviation depends on speed. Table below demonstrates this dependence.

Mph Yd
20 82
30 82
40 84
50 90
60 98
70 107
80 115
90 122
100 128

There are three conditions to met for camera warning:
Direction difference < 30
Deviation < [value from the table above]
Distance < [value from 'time to camera' setting]
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MaFt
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Joined: Aug 31, 2005
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PostPosted: Wed Jan 15, 2020 3:38 pm    Post subject: Reply with quote

Leo_A wrote:
These SPECS are not mistakes?
SPECS:196206@40
SPECS:199924@40

Where it is better to ask such questions? Submission page, field 'Details & description' is ok to write there and sent entry then?

Judging by the other local cameras having been removed I would hazard a guess that yes they need to be removed now.

Leo_A wrote:

Another thing I noticed - there are forgotten EXITSPECS present in the database. Av. zone most likely was removed, but EXITSPECS remained.
52.35318,-2.06819
52.33193,-2.04987

Correct - they generally stay in the database. They don't have any effect on any cameras anyway and can be useful to keep in place if average speed cameras are put in place again on that stretch
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