TRAFFIC API PPT
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The document describes a project to collect traffic data from the MapQuest Traffic API for the area of Chicago, IL. A group of 4 students - Abhinav, Shanmukh, Swarna, and Vinisha - built a URL to query the API for construction and incident data within specific latitude and longitude boundaries. The R code extracts the data from the JSON response, transforms it into a data table, and writes it to an output CSV file. Tools used include Excel, R Studio, and APIs. Learnings included handling SSL verification errors and transforming JSON data.
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TRAFFIC API PPT
- 2. GROUP MEMBERS Abhinav - 71520071 Shanmukh - 71520022 Swarna - 71520112 Vinisha - 71520104
- 3. API details Map quest Free traffic API Location : Chicago , IL Boundary : Latitude : 42.023135, -87.940 Longitude: 41.644286, -87.523661
- 4. URL BUILT *: http://www.mapquestapi.com/traffic/v2/i ncidents?key=9MeX47CdULA7fqTMbUmp hHwGZQlezisk&boundingBox=42.023135, - 87.940101,41.644286, - 87.523661&filters=construction,incidents&i nFormat=kvp&outFormat=json *Incidents Data
- 5. Codelibrary("RCurl") library("jsonlite") library("data.table") url = paste0("http://www.mapquestapi.com/traffic/v2/incidents?key=9MeX47CdULA7fqTMbUmphHwGZQlezisk&boundingBox=42.023135, %20-87.940101,41.644286,%20-87.523661&filters=construction,incidents&inFormat=kvp&outFormat=json") doc <- getURL(url) x <- jsonlite::fromJSON(doc) ids = x$incidents$id type = x$incidents$type severity = x$incidents$severity longitude = x$incidents$lng latitude = x$incidents$lat startTime = x$incidents$startTime endTime = x$incidents$endTime shortDesc = x$incidents$shortDesc fullDesc = x$incidents$fullDesc delayFromFreeFlow = x$incidents$delayFromFreeFlow delayFromTypical = x$incidents$delayFromTypical distance = x$incidents$distance roadName = x$incidents$parameterizedDescription$roadName direction = x$incidents$parameterizedDescription$direction eventText = x$incidents$parameterizedDescription$eventText toLocation = x$incidents$parameterizedDescription$toLocatio iconURL = x$incidents$iconURL b=data.table(ids,type,severity,longitude,startTime,endTime,shortDesc,fullDesc,delayFromFreeFlow,delayFromTypical,distance,roadN ame,direction,eventText,toLocation,iconURL,keep.rownames=True) dim(b) write.csv(b,"OutputTable_Assignment3.csv", row.names = T)
- 6. TOOLS USED - MS EXCEL - R Studio
- 7. OUTPUT
- 8. R Code & Output File
- 9. LEARNINGS WHILE USING APIs SSL shows local verifier Error if Https is used (resolved by doc <- getURL(url, .opts = list(ssl.verifypeer = FALSE)) ) If cross domain data is extracted then Callback is to be handled JSON data transformation will allow to extract all data as list while merging in data frames individual rows were binded so used data tables.
- 10. Thanks