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-- This config example file is released into the Public Domain.
-- This is a very simple Lua config for the Flex Backend not intended for
-- real-world use. Look at and understand "simple.lua" first, before looking
-- at this file. This file demonstrates some column data type options.
local highways = osm2pgsql.define_way_table('highways', {
{ column = 'name', type = 'text' },
-- We always need a highway type, so we can declare the column as NOT NULL
{ column = 'type', type = 'text', not_null = true },
-- Add a SERIAL column and tell osm2pgsql not to fill it (PostgreSQL will
-- do that for us)
{ column = 'id', type = 'serial', create_only = true },
-- type "direction" is special, see below
{ column = 'oneway', type = 'direction' },
{ column = 'maxspeed', type = 'int' },
-- type "bool" is special, see below
{ column = 'lit', type = 'bool' },
{ column = 'tags', type = 'hstore' },
-- an PostgreSQL array type, not specially handled by osm2pgsql, see below
{ column = 'nodes', type = 'int8[]' },
{ column = 'geom', type = 'linestring' },
})
-- Helper function to remove some of the tags we usually are not interested in.
-- Returns true if there are no tags left.
function clean_tags(tags)
tags.odbl = nil
tags.created_by = nil
tags.source = nil
tags['source:ref'] = nil
return next(tags) == nil
end
local highway_types = {
'motorway',
'motorway_link',
'trunk',
'trunk_link',
'primary',
'primary_link',
'secondary',
'secondary_link',
'tertiary',
'tertiary_link',
'unclassified',
'residential',
'track',
'service',
}
-- Prepare table "types" for quick checking of highway types
local types = {}
for _, k in ipairs(highway_types) do
types[k] = 1
end
-- Parse a maxspeed value like "30" or "55 mph" and return a number in km/h
function parse_speed(input)
if not input then
return nil
end
local maxspeed = tonumber(input)
-- If maxspeed is just a number, it is in km/h, so just return it
if maxspeed then
return maxspeed
end
-- If there is an 'mph' at the end, convert to km/h and return
if input:sub(-3) == 'mph' then
local num = tonumber(input:sub(1, -4))
if num then
return math.floor(num * 1.60934)
end
end
return nil
end
function osm2pgsql.process_way(object)
if clean_tags(object.tags) then
return
end
-- Get the type of "highway" and remove it from the tags
local type = object:grab_tag('highway')
-- We are only interested in highways of the given types
if not types[type] then
return
end
-- We want to put the name in its own column
local name = object:grab_tag('name')
highways:add_row({
name = name,
type = type,
-- The 'maxspeed' column gets the maxspeed in km/h
maxspeed = parse_speed(object.tags.maxspeed),
-- The 'oneway' column has the special type "direction", which will
-- store "yes", "true" and "1" as 1, "-1" as -1, and everything else
-- as 0.
oneway = object.tags.oneway or 0,
-- The 'lit' column has the special type "bool", which will store
-- "yes" and "true" as true and everything else as false value.
lit = object.tags.lit,
-- The way node ids are put into a format that PostgreSQL understands
-- for a column of type "int8[]".
nodes = '{' .. table.concat(object.nodes, ',') .. '}',
tags = object.tags
})
end
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