Real-Time Bus Predictions
Real-time bus prediction methods.
XML - Next Buses
Description
Returns next bus arrival times at a stop.
Response Elements
Element | Description |
---|---|
Predictions | Array containing bus predictions (NextBusPrediction). |
StopName | Full name of the given StopID. |
DirectionNum | Denotes a binary direction (0 or 1) of the bus. There is no specific mapping to direction, but a different value for the same route signifies that the buses are traveling in opposite directions. Use the DirectionText element to show the actual destination of the bus. |
DirectionText | Customer-friendly description of direction and destination for a bus. |
Minutes | Minutes until bus arrival at this stop. Numeric value. |
RouteID | Base route name as shown on the bus. This can be used in other bus-related methods. Note that all variants will be shown as their base route names (i.e.: 10Av1 and 10Av2 will be shown as 10A). |
TripID | Trip identifier. This can be correlated with the data in our bus schedule information as well as bus positions. |
VehicleID | Bus identifier. This can be correlated with results returned from bus positions. |
Request URL
Request parameters
string
7-digit regional stop ID.
Request headers
Request body
Response 200
Default response code.
<NextBusResponse
xmlns="http://www.wmata.com"
xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<Predictions>
<NextBusPrediction>
<DirectionNum>0</DirectionNum>
<DirectionText>North to Bwi - Thurgood Marshall Airport</DirectionText>
<Minutes>8</Minutes>
<RouteID>B30</RouteID>
<TripID>6794838</TripID>
<VehicleID>6217</VehicleID>
</NextBusPrediction>
<NextBusPrediction>
<DirectionNum>1</DirectionNum>
<DirectionText>South to Greenbelt Station</DirectionText>
<Minutes>37</Minutes>
<RouteID>B30</RouteID>
<TripID>6794868</TripID>
<VehicleID>6217</VehicleID>
</NextBusPrediction>
<NextBusPrediction>
<DirectionNum>0</DirectionNum>
<DirectionText>North to Bwi - Thurgood Marshall Airport</DirectionText>
<Minutes>48</Minutes>
<RouteID>B30</RouteID>
<TripID>6794839</TripID>
<VehicleID>6213</VehicleID>
</NextBusPrediction>
<NextBusPrediction>
<DirectionNum>1</DirectionNum>
<DirectionText>South to Greenbelt Station</DirectionText>
<Minutes>77</Minutes>
<RouteID>B30</RouteID>
<TripID>6794869</TripID>
<VehicleID>6213</VehicleID>
</NextBusPrediction>
</Predictions>
<StopName>Bwi Airport + Stop 2</StopName>
</NextBusResponse>
Response 400
Response from invalid Stop ID.
<Error><Message>Stop Id not specified, invalid, or does not exist.</Message></Error>
Code samples
@ECHO OFF
curl -v -X GET "https://api.wmata.com/NextBusService.svc/Predictions?StopID=1001195"
-H "api_key: {subscription key}"
--data-ascii "{body}"
using System;
using System.Net.Http.Headers;
using System.Text;
using System.Net.Http;
using System.Web;
namespace CSHttpClientSample
{
static class Program
{
static void Main()
{
MakeRequest();
Console.WriteLine("Hit ENTER to exit...");
Console.ReadLine();
}
static async void MakeRequest()
{
var client = new HttpClient();
var queryString = HttpUtility.ParseQueryString(string.Empty);
// Request headers
client.DefaultRequestHeaders.Add("api_key", "{subscription key}");
// Request parameters
queryString["StopID"] = "1001195";
var uri = "https://api.wmata.com/NextBusService.svc/Predictions?" + queryString;
var response = await client.GetAsync(uri);
}
}
}
// // This sample uses the Apache HTTP client from HTTP Components (http://hc.apache.org/httpcomponents-client-ga/)
import java.net.URI;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
public class JavaSample
{
public static void main(String[] args)
{
HttpClient httpclient = HttpClients.createDefault();
try
{
URIBuilder builder = new URIBuilder("https://api.wmata.com/NextBusService.svc/Predictions");
builder.setParameter("StopID", "1001195");
URI uri = builder.build();
HttpGet request = new HttpGet(uri);
request.setHeader("api_key", "{subscription key}");
// Request body
StringEntity reqEntity = new StringEntity("{body}");
request.setEntity(reqEntity);
HttpResponse response = httpclient.execute(request);
HttpEntity entity = response.getEntity();
if (entity != null)
{
System.out.println(EntityUtils.toString(entity));
}
}
catch (Exception e)
{
System.out.println(e.getMessage());
}
}
}
<!DOCTYPE html>
<html>
<head>
<title>JSSample</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
</head>
<body>
<script type="text/javascript">
$(function() {
var params = {
"api_key": "{subscription key}",
// Request parameters
"StopID": "1001195",
};
$.ajax({
url: "https://api.wmata.com/NextBusService.svc/Predictions?" + $.param(params),
type: "GET",
})
.done(function(data) {
alert("success");
})
.fail(function() {
alert("error");
});
});
</script>
</body>
</html>
#import <Foundation/Foundation.h>
int main(int argc, const char * argv[])
{
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
NSString* path = @"https://api.wmata.com/NextBusService.svc/Predictions";
NSArray* array = @[
// Request parameters
@"entities=true",
@"StopID=1001195",
];
NSString* string = [array componentsJoinedByString:@"&"];
path = [path stringByAppendingFormat:@"?%@", string];
NSLog(@"%@", path);
NSMutableURLRequest* _request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:path]];
[_request setHTTPMethod:@"GET"];
// Request headers
[_request setValue:@"{subscription key}" forHTTPHeaderField:@"api_key"];
// Request body
[_request setHTTPBody:[@"{body}" dataUsingEncoding:NSUTF8StringEncoding]];
NSURLResponse *response = nil;
NSError *error = nil;
NSData* _connectionData = [NSURLConnection sendSynchronousRequest:_request returningResponse:&response error:&error];
if (nil != error)
{
NSLog(@"Error: %@", error);
}
else
{
NSError* error = nil;
NSMutableDictionary* json = nil;
NSString* dataString = [[NSString alloc] initWithData:_connectionData encoding:NSUTF8StringEncoding];
NSLog(@"%@", dataString);
if (nil != _connectionData)
{
json = [NSJSONSerialization JSONObjectWithData:_connectionData options:NSJSONReadingMutableContainers error:&error];
}
if (error || !json)
{
NSLog(@"Could not parse loaded json with error:%@", error);
}
NSLog(@"%@", json);
_connectionData = nil;
}
[pool drain];
return 0;
}
<?php
// This sample uses the Apache HTTP client from HTTP Components (http://hc.apache.org/httpcomponents-client-ga/)
require_once 'HTTP/Request2.php';
$request = new Http_Request2('https://api.wmata.com/NextBusService.svc/Predictions');
$url = $request->getUrl();
$headers = array(
// Request headers
'api_key' => '{subscription key}',
);
$request->setHeader($headers);
$parameters = array(
// Request parameters
'StopID' => '1001195',
);
$url->setQueryVariables($parameters);
$request->setMethod(HTTP_Request2::METHOD_GET);
// Request body
$request->setBody("{body}");
try
{
$response = $request->send();
echo $response->getBody();
}
catch (HttpException $ex)
{
echo $ex;
}
?>
########### Python 2.7 #############
import httplib, urllib, base64
headers = {
# Request headers
'api_key': '{subscription key}',
}
params = urllib.urlencode({
# Request parameters
'StopID': '1001195',
})
try:
conn = httplib.HTTPSConnection('api.wmata.com')
conn.request("GET", "/NextBusService.svc/Predictions?%s" % params, "{body}", headers)
response = conn.getresponse()
data = response.read()
print(data)
conn.close()
except Exception as e:
print("[Errno {0}] {1}".format(e.errno, e.strerror))
####################################
########### Python 3.2 #############
import http.client, urllib.request, urllib.parse, urllib.error, base64
headers = {
# Request headers
'api_key': '{subscription key}',
}
params = urllib.parse.urlencode({
# Request parameters
'StopID': '1001195',
})
try:
conn = http.client.HTTPSConnection('api.wmata.com')
conn.request("GET", "/NextBusService.svc/Predictions?%s" % params, "{body}", headers)
response = conn.getresponse()
data = response.read()
print(data)
conn.close()
except Exception as e:
print("[Errno {0}] {1}".format(e.errno, e.strerror))
####################################
require 'net/http'
uri = URI('https://api.wmata.com/NextBusService.svc/Predictions')
query = URI.encode_www_form({
# Request parameters
'StopID' => '1001195'
})
if uri.query && uri.query.length > 0
uri.query += '&' + query
else
uri.query = query
end
request = Net::HTTP::Get.new(uri.request_uri)
# Request headers
request['api_key'] = '{subscription key}'
# Request body
request.body = "{body}"
response = Net::HTTP.start(uri.host, uri.port, :use_ssl => uri.scheme == 'https') do |http|
http.request(request)
end
puts response.body