问题
I have a mapbox, and want to display a layer of esri data onto it. The data I'm getting is being pulled in from this json file:
https://gis.usps.com/arcgis/rest/services/EDDM/selectZIP/GPServer/routes/execute?f=json&env%3AoutSR=102100&ZIP=93003&Rte_Box=R&UserName=EDDM
The data['results'][0]['value']['features'] array looks something like this:
[{'attributes': {'key':'value'}},{'geometry':{'paths':[[-13273770,4064608],[-13273762,4064613],....]}}, {'attributes': {'key':'value'}},{'geometry':{'paths':[[-13273770,4064608],[-13273762,4064613],....]}}, {'attributes': {'key':'value'}},{'geometry':{'paths':[[-13273770,4064608],[-13273762,4064613],....]}}}]
My question is about the geometry array. The data there is not Lat/Lng values (which I was hoping for), so I'm not sure how to add these to my map. I'm new to GIS, and the research I've done so far points to SpatialReferences. Any help is obviously much appreciated!
回答1:
MapBox seems to only accept Latitude and Longitude coordinates (from what I can tell at least). The coordinates you have in your file come from ESRI 102100 (3857) projection system - the clue is near the beginning of your file:
"spatialReference":{"wkid":102100,"latestWkid":3857}..."
Normally, you'd have to convert this yourself, a good link for potential tips in the future is:
https://gis.stackexchange.com/questions/9442/arcgis-coordinate-system
On this occasion however, you can do something far easier. Simply change the "outSR" property of your URL from 102100 to 4326 (WGS84) and let it do it for you.
https://gis.usps.com/arcgis/rest/services/EDDM/selectZIP/GPServer/routes/execute?f=json&env%3AoutSR=4326&ZIP=93003&Rte_Box=R&UserName=EDDM
来源：https://stackoverflow.com/questions/28862710/mapbox-esri-data-layer