Hi to all,

We can get co-ordinates for a region(city/state/country) using polygon_geojson=1 in nominatim url. It will give large amount of data(co-ordinates) for large regions(example for a country). Now i want to reduce the co-ordinates count. How it is possible?

asked 09 Jul '15, 10:15

Rajavelu_M's gravatar image

accept rate: 33%

Are you asking for an algorithm for simplifying a polygon?

(09 Jul '15, 10:25) scai ♦

@scai: yes. An algorithm for simplifying a polygon is fine. For example http://nominatim.openstreetmap.org/search?q=India&polygon_geojson=1&format=json The above url gives 1.5MB data. I want to reduce co-ordinates and the size to around 200kb.

(09 Jul '15, 10:35) Rajavelu_M

gpsbabel can simplify tracks which could be an option depending on what you are trying to do.

(09 Jul '15, 11:41) scai ♦

... or try JOSM offline editor (not sure whether it can load geojson, but it has a simplify feature for lines)... or maybe QGIS?

(10 Jul '15, 20:25) stephan75

I was trying to do the same and found that using param polygon_threshold=0.009 is usefull

permanent link

answered 26 Feb, 15:09

shaniqwa's gravatar image

accept rate: 0%

Your answer
toggle preview

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here



Answers and Comments

Markdown Basics

  • *italic* or _italic_
  • **bold** or __bold__
  • link:[text](http://url.com/ "title")
  • image?![alt text](/path/img.jpg "title")
  • numbered list: 1. Foo 2. Bar
  • to add a line break simply add two spaces to where you would like the new line to be.
  • basic HTML tags are also supported

Question tags:


question asked: 09 Jul '15, 10:15

question was seen: 3,336 times

last updated: 26 Feb, 15:09

powered by OSQA