Created
February 27, 2013 21:17
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Convert a GeoJSON file from RT90 (Swedish standard) coordinate system to WGS84
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| require 'rubygems' | |
| require 'json' | |
| require "swedishgrid" | |
| def convert(coords) | |
| grid = SwedishGrid.new(:rt90) | |
| reversed = grid.grid_to_geodetic(coords[1], coords[0]) | |
| [reversed[1], reversed[0]] | |
| end | |
| file_name = 'rt90.geojson' | |
| file = File.open(file_name, "r") | |
| contents = file.read | |
| geo_json = JSON.parse(contents) | |
| geo_json['features'].each do |el| | |
| el['geometry']['coordinates'].each do |polygon| | |
| print '.' | |
| polygon.map! do |coords| | |
| if coords[0].is_a? Array | |
| coords.map! do |c| | |
| convert(c) | |
| end | |
| coords | |
| else | |
| convert(coords) | |
| end | |
| end | |
| end | |
| end | |
| file = File.open(file_name, "w") | |
| file.write(geo_json.to_json) | |
| puts 'done!' |
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