Graham McIntire
c56f349c86
95k points at 0.125 degree resolution caused the GRIB2 extraction to take too long. 0.5 degree (~55 km) resolution gives 6k points which completes in under a minute. Can increase resolution later once the extraction is optimized.
28 lines
884 B
Elixir
28 lines
884 B
Elixir
defmodule Microwaveprop.Propagation.Grid do
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@moduledoc "CONUS grid definition for propagation scoring. 0.5 degree resolution (~55 km)."
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@lat_min 25.0
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@lat_max 50.0
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@lon_min -125.0
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@lon_max -66.0
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@step 0.5
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@doc "Returns all grid points as `{lat, lon}` tuples covering CONUS at 0.5 degree spacing."
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def conus_points do
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for lat <- float_range(@lat_min, @lat_max, @step),
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lon <- float_range(@lon_min, @lon_max, @step) do
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{Float.round(lat, 3), Float.round(lon, 3)}
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end
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end
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@doc "Returns the grid step size in degrees."
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def step, do: @step
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@doc "Returns the CONUS bounding box as a map."
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def bounds, do: %{lat_min: @lat_min, lat_max: @lat_max, lon_min: @lon_min, lon_max: @lon_max}
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defp float_range(start, stop, step) do
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count = round((stop - start) / step) + 1
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Enum.map(0..(count - 1), fn i -> start + i * step end)
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end
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end
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