Official Sources of Mapping Information

[ctpoole]

Today I discovered this link for Texas. Press Accept on the page to get to the official State highway system designations and projects in map form:

http://www.txdot.gov/inside-txdot/divis ... nning.html

[jwriddle]

I'll go ahead and do so since the "Georgia" wiki page is currently blank. Thanks.

[AlanOfTheBerg]

This info should be posted to the wiki, if you haven't already.

[jwriddle]

Georgia
http://www.dot.state.ga.us/maps/Pages/default.aspx

The above URL for Georgia Transportation Maps has changed to the following:

http://www.dot.ga.gov/informationcenter/maps/Pages/default.aspx

Main Georgia DOT Website
http://www.dot.ga.gov/Pages/default.aspx

Georgia Navigator Map (LIVE)
http://www.511ga.org/

Georgia Travel Info -- including Travel Alerts; Road Closures, etc.
http://www.dot.ga.gov/travelingingeorgia/Pages/TravelInfo.aspx

Additional GIS Data for Georgia
Georgia State University: http://research.library.gsu.edu/content.php?pid=178923&sid=2129632

[ctpoole]

Texas:

City of Austin -- http://austintexas.gov/department/gis-and-maps

[nnote]

http://maps.mcassessor.maricopa.gov/default.aspx
Central Arizona
Also AZ511.com for Highway info

[marigolds]

State of Missouri spatial data clearinghouse:
http://msdis.missouri.edu/
This is the download link for every transportation file provided by the state:
ftp://msdis.missouri.edu/pub/state/transportation/st_trans06.e00.zip
But you are better off going here first and toggling on the transportation layers:
http://www.msdis.missouri.edu/data/themelist.html

They also have webservices:
http://msdis.missouri.edu/webservices/mapping/index.html
This is every road in the state cataloged by MoDOT as an ArcGIS REST endpoint:
http://msdisweb.missouri.edu/ArcGIS/rest/services/MoDOT_Roads_Quarterly_December_2012_WMS/MapServer
And as a KML generator REST endpoint:
http://msdisweb.missouri.edu/ArcGIS/rest/services/MoDOT_Roads_Quarterly_December_2012_WMS/MapServer/generatekml
These are ArcGIS REST endpoints for every quarterly updated of the roads layers:
http://msdisweb.missouri.edu/ArcGIS/rest/services/MSDIS_Download/MapServer/182

[cwdurst]

Another good source of local Massachusetts roads is:

http://maps.massgis.state.ma.us/map_ol/oliver.php

Hint: turn on the "MassDOT Roads Street Names" Data Layer to get all the streets labeled.

[dbwiddis]

Clark County (Nevada) GIS Management Office:
http://gisgate.co.clark.nv.us/gismo/gismo.htm

[ArlenBystander]

Great idea. As an FYI, the Illinois link sent in the original post is very old and should not be used to gather current information on streets.

Yes, it does look like that IDOT general maps site contains older versions of the highway maps. At least the one township and one county I checked were last updated in the 90s.

The parent page has links maps such as the 5-year functional classification maps which have been updated more recently. Each county (we have 182) might have maps available on its own website.

There is a group of Illinois editors working on getting the state wiki pages, including reference info, in order so I'd recommend that (link is in my sig) for updated IL-specific resources going forward.