IT Notes : Use Overpass Turbo API to extract information from OSM

Use  Overpass Turbo API to extract information from OpenStreetMap

Example : Find and download places of worship in Hong Kong

Go to https://overpass-turbo.eu/

move the map to show Hong Kong SAR boundary

Set [amenity=place_of_worship]



Click [Run] to execute the enquiry
After a while, circles were generated on the map showing the locations of  place of worship.


Select the [Export] option to download the required format, e.g. gpx.


Since some area in Shenzhen was also included in the data collection, remove them using GIS tools.

Import the gpx file into map application. The place of worship was shown in the map.


Alternatively, we can use overpass API to retrieve the above data
First locate HKSAR's border coordinates from Wikipedia


The order of the four numbers is left, bottom, right, top:

http://www.overpass-api.de/api/xapi?map?bbox=left,bottom,right,top

left is the longitude of the left (westernmost) side of the bounding box, or minlon.
bottom is the latitude of the bottom (southernmost) side of the bounding box, or minlat.
right is the longitude of the right (easternmost) side of the bounding box, or maxlon.
top is the latitude of the top (northernmost) side of the bounding box, or maxlat.

http://www.overpass-api.de/api/xapi_meta?*[amenity=place_of_worship][bbox=113.8222,22.12,114.4522,22.5706]

An xml data file containing places of worship in Hong Kong (with some Shenzhen data that needed to be removed) will be downloaded.


Comments

Popular posts from this blog

旅遊筆記 : 吉隆坡前往檳城交通方式及網上購買馬來西亞KTM火車票教學

旅遊筆記 : 馬來西亞電動 Platinum ETS 列車初體驗

日本行山:善用免費資源規劃行程 YAMAP 應用篇 (3)