road segment information is not complete

[hessam94]

hello dear,

Thanks for impressive work. I am working on similar project and interested to use your great dataset. but in your road-segment dataset there is only start node of the street. in your paper you mentioned about a few items, like roadGps, length, etc. So here are my question. I would be appreciate if you can help me. I will definitely cite your paper and will acknowledge you .
1- how can i get main dataset for roads, i really need to have street start and end points. I see you have some intermediate files but i am out side of china and cannot get those files. also in your intermediate files there is nothing about gps coordination of streets. i mean start and end both.
2- i already downloaded your files from backup link, but in that roead-network-subset the sample is this : "1144134225930 116.391026 39.922581". it is not complete as you mentioned in paper, is there any way i can get end point of streets?

highly appreciated in advance

[JingqingZ]

Hi, the road data including start/end points of roads and GPS of start/end points are available to download in the link in README.md.

More explanation can be found #16

[hessam94]

thanks for your response, but I already downloaded the "Road Network Sub-dataset" and it seems is has only start point of the road. would you check it. which link you exactly mean? this is the sample data from Road Network Sub-dataset file :
roadId Y X
""1144134225930 116.391026 39.922581" ,
Thanks my friend. i will read the #16 as well. please let me know about it highly appreciated

[JingqingZ]

The snodeid and enodeid in the file named road_network_sub-dataset represent start/end points of a road/link.

To match those ID with GPS: #6

[hessam94]

thanks , I almost got it, but I just see a problem which is it also mentioned it #6 :
we have a link L1 with S1(snode ) and E1 (enode), There is no entry corresponding to S1_hash and E1_hash in the road_network_sub_dataset? so how complete the network is? it is mentioned less than 1% data incompleteness. is that right? i mean is the road network 99 % complete?? thanks

[hessam94]

i am checking randomly some samples, couldn't find even one connected link, So my another question is, was there any specific reason that you provided snode and enode for each link, because it seems there is not any corresponding for snode and enodes neither is road_network file, nor in link_gps.

[JingqingZ]

Hi sorry for the confusion. You may use the link_id to find gps of roads and start/end node ids to build connections between roads.

As mentioned in #6, 44k out of 450k roads are available to download. Some roads that have missing traffic values are removed as well.