mirror of
https://github.com/SatDump/SatDump
synced 2026-08-13 17:47:30 -04:00
51 lines
1.2 KiB
Lua
51 lines
1.2 KiB
Lua
-- Transparent snow cover using MHS
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function init()
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sat_proj = get_sat_proj()
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img_landmask = image8.new()
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img_landmask:load_jpeg(get_resource_path("maps/landmask.jpg"))
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img_landmask:linear_invert()
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equ_proj = EquirectangularProj.new()
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equ_proj:init(img_landmask:width(), img_landmask:height(), -180, 90, 180, -90)
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return 4
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end
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function process()
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pos = geodetic_coords_t.new()
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for x = 0, rgb_output:width() -1, 1 do
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for y = 0, rgb_output:height() -1, 1 do
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get_channel_values(x, y)
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if not sat_proj:get_position(x, y, pos) then
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x2, y2 = equ_proj:forward(pos.lon, pos.lat)
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mappos = y2 * img_landmask:width() + x2
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mval = img_landmask:get(img_landmask:width() * img_landmask:height() + mappos) / 255.0
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if mval < 0.1 then
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local cch1 = get_channel_value(0)
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local cch2 = get_channel_value(1)
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local redChannel = 1-cch1
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if cch2-cch1 < 0.1 then
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if cch1 < 0.6 then
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set_img_out(3, x, y, 1)
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else
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set_img_out(3, x, y, 0)
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end
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else
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set_img_out(3, x, y, 0)
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end
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set_img_out(0, x, y, redChannel)
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set_img_out(1, x, y, 0)
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set_img_out(2, x, y, 0)
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end
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end
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end
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end
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end
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