Graham McIntire
0f15e99fb9
Phase 2/3/5 of the building-blockage support: * Parser streams csv.gz tiles into compact records (centroid, radius, height) — keeps RAM ~32 B per polygon, drops -1.0-height entries. * Index buckets records into 0.01° (~1 km) grid cells in a public ETS table for concurrent reads; max_height_near/3 and records_near/3 scan only the 9 nearest buckets. * Loader lazily parses any cached quadkey before a Calculate so the scorer is terrain-only when tiles aren't on disk yet. * Rover.PathTerrain now treats each path-sample obstacle as terrain_elev + max_local_building_height, so blocked LOS through recent construction actually reduces clearance. * Selecting a candidate pushes a candidate_buildings event with the buildings near each rover→station path; the hook renders them as height-coloured circles (yellow <10 m, orange 10-30 m, red >=30 m) with a tooltip showing height in meters.
60 lines
1.7 KiB
Elixir
60 lines
1.7 KiB
Elixir
defmodule Microwaveprop.Buildings.Loader do
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@moduledoc """
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Lazily loads cached Microsoft footprint csv.gz tiles into the
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spatial `Microwaveprop.Buildings.Index`. Idempotent: a quadkey
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loaded once stays loaded for the lifetime of the BEAM.
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Tiles that haven't been pre-fetched are skipped with a debug log —
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the rover scorer falls back to terrain-only path analysis when the
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index is missing for a region.
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"""
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alias Microwaveprop.Buildings.Index
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alias Microwaveprop.Buildings.MsFootprints
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alias Microwaveprop.Buildings.Parser
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require Logger
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@zoom 9
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@doc """
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Ensures every quadkey covering `bbox` has its csv.gz tile parsed
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into the index. Returns the list of quadkeys that were *attempted*
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(whether already loaded, freshly loaded, or missing on disk).
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"""
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@spec ensure_loaded_for_bbox(map()) :: [String.t()]
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def ensure_loaded_for_bbox(bbox) do
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quadkeys = MsFootprints.quadkeys_for_bbox(bbox, @zoom)
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Enum.each(quadkeys, &ensure_loaded/1)
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quadkeys
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end
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@doc """
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Load a single quadkey. No-op if already loaded; logs and skips if
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the csv.gz file is missing on disk.
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"""
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@spec ensure_loaded(String.t()) :: :ok
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def ensure_loaded(quadkey) do
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if Index.loaded?(quadkey) do
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:ok
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else
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do_load(quadkey)
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end
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end
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defp do_load(quadkey) do
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path = Path.join(MsFootprints.cache_dir(), "#{quadkey}.csv.gz")
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if File.exists?(path) do
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records = path |> Parser.parse_tile() |> Enum.to_list()
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Index.insert_records(records)
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Index.mark_loaded(quadkey)
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Logger.info("buildings index: loaded #{quadkey} (#{length(records)} polygons)")
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else
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Logger.debug("buildings index: tile #{quadkey} not on disk; skipping")
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Index.mark_loaded(quadkey)
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end
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:ok
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end
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end
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