When searching Google Maps for a city, the city's administrative boundary is displayed.
Is there a way to get the polygon boundaries of City in a JSON format using google maps api?
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1Related post: Which API method provides the drawing of a city's boundaries?– ArMoraerMar 3, 2016 at 12:46
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1@ArMoraer your related post is a dead end– abboodJun 4, 2018 at 7:49
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The format for Google map is GeoJson. There is an API for querying by zipcodes,city and state ,👉 www.boundaries-io.com– Jeryl CookSep 19, 2019 at 12:17
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5 Answers
You can get polygon coordenates in json for using with googlemaps using openstreetmap. Go to http://nominatim.openstreetmap.org/ search a place like "Partido de ItuzaingĂł"
click on "details"
Look for OSM ID and copy it (control+c), example: 2018776
paste the ID in http://polygons.openstreetmap.fr/index.py and download the polygon
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polygons.openstreetmap.fr/index.py not work anymore. you can use global.mapit.mysociety.org– Shai M.Dec 26, 2017 at 12:15
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2global.mapit.mysociety.org didn't work for Baghdad (but the original post did): first I got it here: nominatim.openstreetmap.org/details.php?place_id=179724619, then found the relation id to be
5638803, when I run global.mapit.mysociety.org/code/osm_rel/5638803 I get{"code": 404, "error": "No areas were found that matched code osm_rel = 5638803."}– abboodJun 4, 2018 at 8:02 -
Too complicated. And didn't work for me. its easier to grab the geojson directly from the nominatim's source code.– ymakuxJan 27, 2020 at 3:32
To get polygon boundaries just add format=json to your request!
So instead of https://nominatim.openstreetmap.org/search.php?q=Warsaw+Poland&polygon_geojson=1
use
https://nominatim.openstreetmap.org/search.php?q=Warsaw+Poland&polygon_geojson=1&format=json
By adding &format=geojson you can get a valid geojson response
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Thanks, I would like to download the boundaries of all neighbourhood within a city? Is this also doable and what is the command for that?– NeStackMay 8, 2022 at 12:07
I've found a work around solution for this problem.
- Go to www.gadm.org/country
- Choose your country and select Google Earth .kmz file format
- Choose the level you need (level 3 is the deepest with all small towns/cities)
- Download the file (can be large)
- Unzip the .kmz file (You'll find a .kml which is XML)
- Open it with Sublime or notepad++ (the file will probably be too large for other text editor)
- Search by city name and copy data below (Search can take 1 to 4 seconds with large file)
You can use lat,long data and parse it into an array. This solution is working well, but the quality of the path is sometimes rough.
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Excellent tip thanks. I've made a basic repo with PHP and javascript to automate much of this herE: github.com/andyg2/parse-gadm-kml– Andy GeeSep 2, 2021 at 12:41
No, there is no way to steal Google's data. May be you could look at OpenStreetMap which is designed for people to download.
answered Mar 3, 2016 at 20:01
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1Have some exemple, how can extract polygons boundaries in OpenStreetMap? If I extract this, can draw the extracted polygon on google maps? Mar 4, 2016 at 19:25
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Please search this site and ask a new question if you are unable to find the answer to this– Ian Turton ♦Mar 4, 2016 at 19:52
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2Who would consider this stealing? This data is taken from the US Census. Jun 10, 2019 at 5:17
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1then fetch it from the US census site, though I doubt they have many UK city boundaries– Ian Turton ♦Jun 10, 2019 at 7:37
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As an alternative to Google Maps API, OpenStreetMap may help you to search for a city by name in this page http://nominatim.openstreetmap.org/ . Then review search results, and you can get region coordinate in GeoJSON format e.g (http://nominatim.openstreetmap.org/details.php?place_id=145126778) to get mashhad geojson coordinates in Administrative tab
