Created
June 6, 2014 11:50
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ラインやポリゴンのデータもストリーム処理でベクトルタイルに変換する convert.rb
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# coding: utf-8 | |
require 'georuby-ext' # gem install georuby-ext | |
require 'geo_ruby/shp' | |
require 'fileutils' | |
require 'json' | |
include GeoRuby::Shp4r | |
module Math | |
def self.sec(x) | |
1.0 / cos(x) | |
end | |
end | |
module XYZ | |
def self.pt2xy(pt, z) | |
lnglat2xy(pt.x, pt.y, z) | |
end | |
def self.lnglat2xy(lng, lat, z) | |
n = 2 ** z | |
rad = lat * 2 * Math::PI / 360 | |
[n * ((lng + 180) / 360), | |
n * (1 - (Math::log(Math::tan(rad) + | |
Math::sec(rad)) / Math::PI)) / 2] | |
end | |
def self.xyz2lnglat(x, y, z) | |
n = 2 ** z | |
rad = Math::atan(Math.sinh(Math::PI * (1 - 2.0 * y / n))) | |
[360.0 * x / n - 180.0, rad * 180.0 / Math::PI] | |
end | |
def self.xyz2envelope(x, y, z) | |
GeoRuby::SimpleFeatures::Envelope.from_points([ | |
GeoRuby::SimpleFeatures::Point.from_coordinates( | |
xyz2lnglat(x, y, z)), | |
GeoRuby::SimpleFeatures::Point.from_coordinates( | |
xyz2lnglat(x + 1, y + 1, z))]) | |
end | |
end | |
class GeoRuby::SimpleFeatures::Geometry | |
def tile(z) | |
lower = XYZ::pt2xy(self.bounding_box[0], z) | |
upper = XYZ::pt2xy(self.bounding_box[1], z) | |
rg = self.to_rgeo | |
lower[0].truncate.upto(upper[0].truncate) {|x| | |
upper[1].truncate.upto(lower[1].truncate) {|y| | |
env = XYZ::xyz2envelope(x, y, z).to_rgeo | |
intersection = rg.intersection(env) | |
if intersection.is_empty? | |
$stderr.print "e" | |
next | |
end | |
if intersection.respond_to?(:each) | |
intersection.each {|g| | |
$stderr.print "m" | |
yield x, y, JSON.parse(g.to_georuby.as_geojson) | |
} | |
else | |
$stderr.print "s" | |
yield x, y, JSON.parse(intersection.to_georuby.as_geojson) | |
end | |
} | |
} | |
end | |
end | |
def write(geojson, tzxy) | |
path = tzxy.join('/') + '.geojson' | |
print "writing #{geojson[:features].size} features to #{path}\n" | |
[File.dirname(path)].each {|d| FileUtils.mkdir_p(d) unless File.exist?(d)} | |
File.open(path, 'w') {|w| w.print(JSON.dump(geojson))} | |
end | |
def map(t, z, paths) | |
IO.popen("sort | ruby #{__FILE__}", 'w') {|io| | |
fid = 0 | |
paths.each {|path| | |
ShpFile.open(path) {|shp| | |
shp.each{|r| | |
fid += 1 | |
prop = r.data.attributes | |
prop[:fid] = fid | |
$stderr.print "[#{fid}]" | |
prop.each {|k, v| | |
if(v.class == String) | |
prop[k] = v.encode('UTF-8', 'CP932') | |
end | |
} | |
r.geometry.tile(z) {|x, y, g| | |
f = {:type => 'Feature', :geometry => g, :properties => prop} | |
io.puts([t, z, x, y, JSON.dump(f)].join("\t") + "\n") | |
} | |
} | |
} | |
} | |
$stderr.print "\n" | |
} | |
end | |
def reduce | |
last = nil # to extend the scope of the variable | |
geojson = nil # to extend the scope of the variable | |
while gets | |
r = $_.strip.split("\t") | |
current = r[0..3] | |
if current != last | |
write(geojson, last) unless last.nil? | |
geojson = {:type => 'FeatureCollection', :features => []} | |
end | |
geojson[:features] << JSON.parse(r[4]) | |
last = current | |
end | |
write(geojson, last) | |
end | |
def help | |
print <<-EOS | |
ruby convert.rb {theme} {z} {shapefiles...} | |
EOS | |
end | |
if __FILE__ == $0 | |
if ARGV.size == 0 | |
reduce | |
else | |
begin | |
# ruby convert.rb test 10 /Users/hfu/Downloads/A13-11_42_GML/a001420020120310.shp | |
map(ARGV[0], ARGV[1].to_i, ARGV[2..-1]) | |
rescue | |
p $! | |
help | |
end | |
end | |
end |
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