Travel Mapping

Highway Data Discussion => Updates to Highway Data => Solved Highway data updates => Topic started by: Jim on August 21, 2016, 11:05:59 pm

Title: DE: US 13 at the MD border
Post by: Jim on August 21, 2016, 11:05:59 pm

I noticed in the datacheck that US 13 in Delaware has two points at the Maryland border.  I assume this is showing up now because of my NMP fixes that included Delaware.  But that seems like an odd thing to have.  Why not just have MD/DE with DE54 as an alt label?  Thoughts?

Title: Re: DE: US 13 at the MD border
Post by: froggie on August 22, 2016, 07:11:58 am

Given the states involved, I'm guessing that's something Tim put in for reasons only Tim could explain...

Title: Re: DE: US 13 at the MD border
Post by: rickmastfan67 on August 22, 2016, 07:43:01 am

I did something similar with US-11W in VA because of US-421 starting/ending a multiplex right at the intersection where it leaves, but doesn't enter TN (but does later on).'
https://github.com/TravelMapping/HighwayData/blob/master/hwy_data/VA/usaus/va.us011w.wpt

I just know that the TN/VA state line that is shown in OSM can't be 100% relied on, as I know for a fact, State Street has the border go straight down the center, and there are little markers in-bedded in the pavement in Downtown Bristol (yes, I have close up photos from during the NASCAR Street Fair they have on that street).

Title: Re: DE: US 13 at the MD border
Post by: mapcat on November 02, 2016, 09:32:40 pm

Since MD 54 changes to DE 54 right at US 13, and GMSV shows the state line following that route (https://www.google.com/maps/place/Delmar,+DE+19940/@38.4555414,-75.5581339,3a,55.4y,38.34h,83.08t/data=!3m7!1e1!3m5!1swY46EKipAuxJFisSOb-Zyw!2e0!6s%2F%2Fgeo1.ggpht.com%2Fcbk%3Fpanoid%3DwY46EKipAuxJFisSOb-Zyw%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D66.37644%26pitch%3D0%26thumbfov%3D100!7i13312!8i6656!4m5!3m4!1s0x89b8fb56974cb497:0xce574a5ca5ccbb41!8m2!3d38.4565052!4d-75.5771471), I went ahead and changed it to what Jim suggested.

If anything, the state line is slightly north of DE/MD 54 at US 13, according to this Maryland DOT map (http://sha.maryland.gov/Gridmaps/GridMap_J17A.pdf). OSM concurs (http://www.openstreetmap.org/#map=18/38.45485/-75.55910), but I think the difference is so negligible that adding a MD 54/DE 54 point to Maryland (and changing DE 54 to MD 54 there, contradicting signage (https://www.google.com/maps/@38.4554766,-75.5567325,3a,42.5y,100.78h,87.2t/data=!3m6!1e1!3m4!1sYdzEi6aTuKIEcT2HGL5YDg!2e0!7i13312!8i6656)) would be pointless.

Title: Re: DE: US 13 at the MD border
Post by: froggie on November 03, 2016, 07:21:56 am

Quote

If anything, the state line is slightly north of DE/MD 54 at US 13

North of the centerline, but basically along the northern pavement edge per GIS data.

But that's so close of a distance as to be negligible, as you suggested.