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-- Transparent snow cover using MHS
function init()
if not has_sat_proj() then
lerror("This composite requires projection info")
return 0
end
sat_proj = get_sat_proj()
img_landmask = image_t.new()
image_load_jpeg(img_landmask, get_resource_path("maps/landmask.jpg"))
image_linear_invert(img_landmask)
equ_proj = EquirectangularProj.new()
equ_proj:init(img_landmask:width(), img_landmask:height(), -180, 90, 180, -90)
return 4
end
function process()
pos = geodetic_coords_t.new()
for x = 0, rgb_output:width() -1, 1 do
for y = 0, rgb_output:height() -1, 1 do
get_channel_values(x, y)
if not sat_proj:get_position(x, y, pos) then
x2, y2 = equ_proj:forward(pos.lon, pos.lat)
mappos = y2 * img_landmask:width() + x2
mval = img_landmask:get(img_landmask:width() * img_landmask:height() + mappos) / 255.0
if mval < 0.1 then
local cch1 = get_channel_value(0)
local cch2 = get_channel_value(1)
local redChannel = 1-cch1
if cch2-cch1 < 0.1 then
if cch1 < 0.6 then
set_img_out(3, x, y, 1)
else
set_img_out(3, x, y, 0)
end
else
set_img_out(3, x, y, 0)
end
set_img_out(0, x, y, redChannel)
set_img_out(1, x, y, 0)
set_img_out(2, x, y, 0)
end
end
end
end
end
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