added bootstrap buildings

scripts/osm2pgsql_buildings.lua

@@ -0,0 +1,75 @@
+local buildings = osm2pgsql.define_area_table('buildings', {
+  { column = 'osm_id', type = 'bigint', not_null = true },
+  { column = 'geom', type = 'multipolygon', projection = 4326, not_null = true },
+  { column = 'height_m', type = 'real', not_null = true },
+  { column = 'levels', type = 'int' },
+  { column = 'building_type', type = 'text' },
+  { column = 'source', type = 'text', not_null = true },
+})
+
+local function parse_number(value)
+  if value == nil then
+    return nil
+  end
+  local normalized = tostring(value):gsub(',', '.')
+  local number = normalized:match('[-+]?%d+%.?%d*')
+  if number == nil then
+    return nil
+  end
+  return tonumber(number)
+end
+
+local function default_height(building_type)
+  if building_type == 'garage' or building_type == 'garages' or building_type == 'shed' then
+    return 3.0
+  end
+  if building_type == 'industrial' or building_type == 'warehouse' then
+    return 8.0
+  end
+  if building_type == 'church' or building_type == 'cathedral' then
+    return 12.0
+  end
+  return 9.0
+end
+
+local function building_height(tags)
+  local height = parse_number(tags.height)
+  if height ~= nil and height > 0 then
+    return height, parse_number(tags['building:levels']), 'measured'
+  end
+
+  local levels = parse_number(tags['building:levels'])
+  if levels ~= nil and levels > 0 then
+    return levels * 3.0, levels, 'estimated'
+  end
+
+  return default_height(tags.building), nil, 'estimated'
+end
+
+local function add_building(object, geom)
+  if object.tags.building == nil or object.tags.building == 'no' then
+    return
+  end
+
+  local height_m, levels, source = building_height(object.tags)
+  buildings:add_row({
+    osm_id = object.id,
+    geom = geom,
+    height_m = height_m,
+    levels = levels,
+    building_type = object.tags.building,
+    source = source,
+  })
+end
+
+function osm2pgsql.process_way(object)
+  if object.is_closed then
+    add_building(object, object:as_multipolygon())
+  end
+end
+
+function osm2pgsql.process_relation(object)
+  if object.tags.type == 'multipolygon' or object.tags.type == 'boundary' then
+    add_building(object, object:as_multipolygon())
+  end
+end