Does anybody know where I can download the Interstate highway system (as a shapefile) for Southern California (the area around San Diego in particular)?
2 Answers
Go to https://www.census.gov/cgi-bin/geo/shapefiles2012/main and select Roads from the layer. Then you can select either all primary and secondary roads for the state, or you can get all the roads on a county by county basis.
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I've already got ALL the roads for San Diego County (161,000 +)! I need JUST the interstates (to differentiate from a residential street).– zetarMar 21, 2013 at 13:04
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2You could download the California Primary & Secondary roads shapefile (a 13MB download) and clip them with the San Diego County boundary. If your existing layer is based on TIGER you could also look in your attribute table and pull records with S1100 or S1200 in the MTFCC field. Mar 21, 2013 at 13:17
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This is the answer! I'm using this in my own program (that I wrote) and it only took a few seconds to clip the data to San Diego County... thanks!– zetarMar 21, 2013 at 14:02
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Awesome! Glad to help! Out of curiosity, what language are you using? Which libraries? Mar 21, 2013 at 14:11
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I've only done a quick search but there's one for the whole of the USA here:
http://www.nws.noaa.gov/geodata/catalog/transportation/html/interst.htm
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Yes, that's the ENTIRE interstate (>600 kb)! I need JUST the interstates in San Diego county (to differentiate from the residential roads and alleys which I already have as a shapefile).– zetarMar 21, 2013 at 13:06
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3Can you not filter to get only the ones that interest you then? "He who can do more can do less"– AnameMar 21, 2013 at 13:46
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I'm not using ARCGIS Desktop Explorer; I'm writing my own code. I'm actually 'clipping' the data to a rectangle (in this case downtown San Diego).– zetarMar 21, 2013 at 16:09