Author Topic: MO: I-44 off center waypoints  (Read 282 times)

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Offline bejacob

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MO: I-44 off center waypoints
« on: February 27, 2018, 09:55:04 am »
Waypoint 55 (exit 186) is off centered at the interchange with US63. This is causing the intersecting/concurrent routes to not be displayed.

This appears to be a problem at multiple waypoints along I-44. No intersecting routes are shown at numerous exit along I-44 despite intersecting routes showing on the map (exits 26, 29, 82, 159, 184, 186, and probably more). Not sure how serious a problem this is, but if users are referencing the interesting/connecting routes, this will cause issues. It looks like some routes intersecting I-44 are using different waypoint coordinates than those being used on I-44 for the same interchange.

I don't know if this problem affects other Interstates as I was just looking at I-44.
« Last Edit: February 28, 2018, 10:04:34 am by bejacob »

Online Jim

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Re: MO: I-44 off center waypoints
« Reply #1 on: February 27, 2018, 10:10:10 am »
The ones I looked at should all be fixed to line up.  It's not just I-44, it looks like most of the NMPs in Missouri should be fixed.

In some cases elsewhere, situations arise where the points don't line up and it was intentional.  For example, many New York Thruway interchanges have the I-90 or I-87 point on the surface road at the Thruway entrance ramp while the Thruway's point is at an overpass.

Offline Highway63

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Re: MO: I-44 off center waypoints
« Reply #2 on: February 28, 2018, 01:08:29 am »
Are there changes to the files then? I-44, any others?

Likely the I-44 file was an original and point drift happened.

Online Jim

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Re: MO: I-44 off center waypoints
« Reply #3 on: February 28, 2018, 07:14:59 am »
Are there changes to the files then? I-44, any others?

Likely the I-44 file was an original and point drift happened.

It looks like there are changes throughout the state (Missouri is not unique in this respect).

Online Jim

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Re: MO: I-44 off center waypoints
« Reply #4 on: February 28, 2018, 11:33:02 am »
In the past, I've used the files in the nmp_merged directories to address misaligned points very quickly and painlessly.  The risk is that if you don't look at least quickly at each one, for example by loading up tm-master.nmp in the HDX, you could merge points that were left separate intentionally.

Offline Highway63

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Re: MO: I-44 off center waypoints
« Reply #5 on: March 04, 2018, 01:12:08 am »
It looks like there are changes throughout the state (Missouri is not unique in this respect).
So do I have to re-download things to sync?

Online Jim

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Re: MO: I-44 off center waypoints
« Reply #6 on: March 04, 2018, 12:19:50 pm »
It looks like there are changes throughout the state (Missouri is not unique in this respect).
So do I have to re-download things to sync?

I haven't made any changes.  If you'd like me to copy in some or all of the "NMP merged" files from Missouri I'm happy to do so.

Offline Highway63

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Re: MO: I-44 off center waypoints
« Reply #7 on: March 08, 2018, 01:46:30 am »
In the past, I've used the files in the nmp_merged directories to address misaligned points very quickly and painlessly.  The risk is that if you don't look at least quickly at each one, for example by loading up tm-master.nmp in the HDX, you could merge points that were left separate intentionally.
Can you explain what I'm looking at here? I don't understand where those other coordinates came from.

I looked at the MO I-44 file in that directory and yes, there are some differences in the last three decimal places of some coordinates. All the ones that are different start with https instead of http - is that an additional issue, or can it parse either?

Doing a spot check I see differences in US 63, US 71 (and thus both I-29 and I-49), and even a solitary point in MO 5. For example, the first point on US 50:

KS/MO http://www.openstreetmap.org/?lat=38.936913&lon=-94.607948
KS/MO https://www.openstreetmap.org/?lat=38.936947&lon=-94.607520

Obviously I want the most accurate points and files to be used, but I will need to know just what I'm going to have to copy/save in order to update things.

Online Jim

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Re: MO: I-44 off center waypoints
« Reply #8 on: March 08, 2018, 04:38:33 pm »
I wrote that code a long time ago, but fortunately I commented what was happening:

Code: [Select]
                    # for now, arbitrarily choose the northernmost
                    # latitude and westernmost longitude values in the
                    # list and denote a "merged" point with the https

The http vs https doesn't matter.  In fact, everything in the OSM URLs we use that comes before the first '=' is totally ignored.

Offline Highway63

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Re: MO: I-44 off center waypoints
« Reply #9 on: March 10, 2018, 01:03:51 pm »
Now I'm really confused, because of the example points above, mine (the first one) goes directly to the center of the interchange while the other ("merged") is noticeably east of there.