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bstabler / TransportationNetworks

Transportation Networks for Research
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Chicago Coordinates incorrect #23

Closed alexdawn closed 4 years ago

alexdawn commented 5 years ago

image

Following the readme I've tried plotting the nodes with the state plane projection using QGIS: NAD_1983_StatePlane_Illinois_East_FIPS_1201_Feet

however as you can see in the screenshot this is not quite right

chkwon commented 5 years ago

I am not an expert in GIS, but is there any chance that they are in different coordinate systems?

alexdawn commented 5 years ago

Most likely, I've tried the 8 different Illinois State projections in QGIS and none are right, it can take custom projection parameters. I'm no expert on US systems so there could be others. An EPSG index number would be really useful to know exactly which system was used.

bstabler commented 5 years ago

Maybe you need a false easting?

hhngo96 commented 5 years ago

Image 1 I also have the same issue in arcgis. The red polygon are the City of Chicago itself (plotted from the data given by their official website). I tried the NAD 1927 Illinois State Plane East for this figure (i have tried other as well but it do not work).

ililbst commented 5 years ago

If I have real coordinates reading from GPS, how do I upload them to the networks?