Minimal viable Go bindings for doing minimal viable things with the Mapzen Valhalla Turn-by-Turn API.
You will need to have both Go (specifically a version of Go more recent than 1.6 so let's just assume you need Go 1.9 or higher) and the make programs installed on your computer. Assuming you do just type:
make bin
All of this package's dependencies are bundled with the code in the vendor directory.
./bin/valhalla-route -h
Usage of ./bin/valhalla-route:
-api-key string
A valid Mapzen API key. (default "mapzen-xxxxxx")
-costing string
A valid Valhalla costing. (default "auto")
-endpoint string
A valid Valhalla API endpoint. (default "valhalla.mapzen.com")
-from string
Starting latitude,longitude position.
-from-wofid int
Starting Who's On First ID.
-to string
Destination latitude,longitude position.
-to-wofid int
Destination Who's On First ID.
For example:
$> valhalla-route -api-key mapzen-xxxx -from 40.759220,-73.987126 -to 40.765852,-73.968329 | jq '.trip.legs[].shape'
"eewvlAnzxblChRwl@nSeo@Nm@~BoHzAuEdAyCd@iB`BcF|s@m|B~Mwb@xBqGjBuFjUkt@xv@qcChBcGbBsFfc@ytAzAeFyCiBsPkL_OmJyf@a\\af@s[i\\}SmEyCkBkAaC{AmTuNyLaIqb@wXiBkAaCiBqQkLaHuEaCyAqB{AiC{Ao^kViBkAyB{AoSwMeJcGsBkA_CkBqRgMyGgEuEwCoXaRuO}Jyb@eYcFgD{e@c[yGuE_TyMaHuEye@q[{B{Am^{UqB{Aqb@wXqB{AyBkAu^kVyB{AyBkAo^kVyByAjAwD|c@gvAbf@r[ze@b[oIfX"
Or:
$> valhalla-route -api-key mapzen-xxxxx -from 40.759220,-73.987126 -to 40.765852,-73.968329 | jq '.trip.legs[].maneuvers[].instruction'
"Drive southeast on West 46th Street."
"Turn left onto Madison Avenue."
"Turn right onto East 65th Street."
"Turn right onto Park Avenue."
"Turn right onto East 63rd Street."
"Your destination is on the right."
You can also pass the valhalla-route tool Who's On First IDs to route to and from. For example:
./bin/valhalla-route -api-key mapzen-xxxxxx -from-wofid 1108798585 -to-wofid 270097925 | jq '.trip.legs[].shape'
"cajagAryumhF~H}JrVq\\tYm_@jBhClO~R~kAy~A~kAi_Bju@rcAln@p{@zZxa@xa@jk@jG]dELvDl@zE|@tExA|ExBzEfDzFfErFbFpGpG`H`HzG~HhWb\\|DbFvHlJze@nh@|JvN|JtOdJtOnIvNfItOdcAzqBlEzL~C`HnDpGjF~HrF`HbGpHvH~HfI~HpHrG~HpGvIbGfX`RnDfC~CxCnCvCxCdEnCvDjBtEbAdEl@bF`Bb\\l@~HdAxLrKvNzd@bo@hRhWx\\de@p\\dd@`R{VtO_Sli@_r@tn@o}@~NoStEuE|NeO~HsFzLsFhL]bR}@fg@yBnS}@zPk@li@iC~SkAbAfc@dAng@`Bbp@jBdx@pB`|@pB`{@fS{@"
Valhalla polylines can then be handed off to the Mapzen Places mapzen.places.getByPolyline API method.
For example, here are the unique postal codes you would pass through traveling from the Mapzen offices, in downtown San Francisco, to Zeitgeist, in the Mission:
curl -s 'https://places.mapzen.com/v1?api_key=mapzen-******&method=whosonfirst.places.getByPolyline&polyline=cajagAryumhF%7EH%7DJrVq%5CtYm_%40jBhClO%7ER%7EkAy%7EA%7EkAi_Bju%40rcAln%40p%7B%40zZxa%40xa%40jk%40jG%5DdELvDl%40zE%7C%40tExA%7CExBzEfDzFfErFbFpGpG%60H%60HzG%7EHhWb%5C%7CDbFvHlJze%40nh%40%7CJvN%7CJtOdJtOnIvNfItOdcAzqBlEzL%7EC%60HnDpGjF%7EHrF%60HbGpHvH%7EHfI%7EHp%5C+HrG%7EHpGvIbGfX%60RnDfC%7ECxCnCvCxCdEnCvDjBtEbAdEl%40bF%60Bb%5Cl%40%7EHdAxLrKvNzd%40bo%40hRhWx%5Cde%40p%5Cdd%40%60R%7BVtO_Sli%40_r%40tn%40o%7D%40%7ENoStEuE%7CNeO%7EHsFzLsFhL%5DbR%7D%40fg%40yBnS%7D%40zPk%40li%40iC%7ESkAbAfc%40dAng%40%60Bbp%40jBdx%40pB%60%7C%40pB%60%7B%40fS%7B%40&precision=6&unique=1&placetype=postalcode' | python -mjson.tool
{
"cursor": null,
"next_query": null,
"page": 1,
"pages": 1,
"per_page": 100,
"places": [
[
{
"wof:country": "US",
"wof:id": 554784673,
"wof:name": "94105",
"wof:parent_id": "85922583",
"wof:placetype": "postalcode",
"wof:repo": "whosonfirst-data-postalcode-us"
},
{
"wof:country": "US",
"wof:id": 554784667,
"wof:name": "94103",
"wof:parent_id": "85922583",
"wof:placetype": "postalcode",
"wof:repo": "whosonfirst-data-postalcode-us"
},
{
"wof:country": "US",
"wof:id": 554784675,
"wof:name": "94107",
"wof:parent_id": "85922583",
"wof:placetype": "postalcode",
"wof:repo": "whosonfirst-data-postalcode-us"
},
{
"wof:country": "US",
"wof:id": 554784681,
"wof:name": "94110",
"wof:parent_id": "85922583",
"wof:placetype": "postalcode",
"wof:repo": "whosonfirst-data-postalcode-us"
}
]
],
"stat": "ok",
"total": null
}
Note that a) the polyline in the API call is URL-encoded and b) we are explicitly passing a precision=6 parameter to distinguish the polyline from the usual 5-decimal precision polylines that Google uses.