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--[[
A simple example tilemaker configuration, intended to illustrate how it
works and to act as a starting point for your own configurations.
The basic principle is:
- read OSM tags with Find(key)
- write to vector tile layers with Layer(layer_name)
- add attributes with Attribute(field, value)
(This is a very basic subset of the OpenMapTiles schema. Don't take much
notice of the "class" attribute, that's an OMT implementation thing which
is just here to get them to show up with the default style.)
It doesn't do much filtering by zoom level - all the roads appear all the
time. If you want a practice project, try fixing that!
You can view your output with tilemaker-server:
tilemaker-server /path/to/your.mbtiles --static server/static
]]--
-- Nodes will only be processed if one of these keys is present
node_keys = { "amenity", "historic", "leisure", "place", "shop", "tourism" }
-- Assign nodes to a layer, and set attributes, based on OSM tags
function node_function(node)
-- POIs go to a "poi" layer (we just look for amenity and shop here)
local amenity = Find("amenity")
local shop = Find("shop")
if amenity~="" or shop~="" then
Layer("poi")
if amenity~="" then Attribute("class",amenity)
else Attribute("class",shop) end
Attribute("name:latin", Find("name"))
AttributeNumeric("rank", 3)
end
-- Places go to a "place" layer
local place = Find("place")
if place~="" then
Layer("place")
Attribute("class", place)
Attribute("name:latin", Find("name"))
if place=="city" then
AttributeNumeric("rank", 4)
MinZoom(3)
elseif place=="town" then
AttributeNumeric("rank", 6)
MinZoom(6)
else
AttributeNumeric("rank", 9)
MinZoom(10)
end
end
end
-- Assign ways to a layer, and set attributes, based on OSM tags
function way_function()
local highway = Find("highway")
local waterway = Find("waterway")
local building = Find("building")
-- Roads
if highway~="" then
Layer("transportation", false)
if highway=="unclassified" or highway=="residential" then highway="minor" end
Attribute("class", highway)
-- ...and road names
local name = Find("name")
if name~="" then
Layer("transportation_name", false)
Attribute("class", highway)
Attribute("name:latin", name)
end
end
-- Rivers
if waterway=="stream" or waterway=="river" or waterway=="canal" then
Layer("waterway", false)
Attribute("class", waterway)
AttributeNumeric("intermittent", 0)
end
-- Lakes and other water polygons
if Find("natural")=="water" then
Layer("water", true)
if Find("water")=="river" then
Attribute("class", "river")
else
Attribute("class", "lake")
end
end
-- Buildings
if building~="" then
Layer("building", true)
end
end
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