77 lines
1.9 KiB
Ruby
77 lines
1.9 KiB
Ruby
module OSM
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# This piece of magic reads a GPX with SAX and spits out
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# lat/lng and stuff
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#
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# This would print every latitude value:
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#
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# gpx = OSM:GPXImporter.new('somefile.gpx')
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# gpx.points {|p| puts p['latitude']}
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require 'time'
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require 'rexml/parsers/sax2parser'
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require 'rexml/text'
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class GPXImporter
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attr_reader :possible_points
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attr_reader :actual_points
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attr_reader :tracksegs
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def initialize(filename)
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@filename = filename
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@possible_points = 0
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@actual_points = 0
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@tracksegs = 0
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end
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def points
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file = File.new(@filename)
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parser = REXML::Parsers::SAX2Parser.new( file )
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lat = -1
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lon = -1
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ele = -1
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date = Time.now();
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gotlatlon = false
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gotele = false
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gotdate = false
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parser.listen( :start_element, %w{ trkpt }) do |uri,localname,qname,attributes|
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lat = attributes['lat'].to_f
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lon = attributes['lon'].to_f
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gotlatlon = true
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@possible_points += 1
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end
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parser.listen( :characters, %w{ ele } ) do |text|
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ele = text
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gotele = true
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end
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parser.listen( :characters, %w{ time } ) do |text|
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if text && text != ''
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date = Time.parse(text)
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gotdate = true
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end
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end
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parser.listen( :end_element, %w{ trkseg } ) do |uri, localname, qname|
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@tracksegs += 1
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end
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parser.listen( :end_element, %w{ trkpt } ) do |uri,localname,qname|
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if gotlatlon && gotdate
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ele = '0' unless gotele
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if lat < 90 && lat > -90 && lon > -180 && lon < 180
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@actual_points += 1
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yield Hash['latitude' => lat,'longitude' => lon,'timestamp' => date,'altitude' => ele,'segment' => @tracksegs]
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end
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end
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gotlatlon = false
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gotele = false
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gotdate = false
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end
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parser.parse
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end
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end
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end
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