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calcClosest.m
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calcClosest.m
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% Takes hurricane coordinates at a certain timestep, and finds the eddies
% closest to those coordinates.
% lat/lon are the hurricane coordinates, and antiCyc/cyc are file handles
% to eddy bodies from the timeframe cooresponding to hurricane coordinates
%
% proxType:
% 0 - miss
% 1 - within 1-2 grid cells
% 2 - edge
% 3 - core (or nearly so) overlap
% eddyClass:
% +1 - Anticyclonic
% -1 - Cyclonic
%
function [eddyClass, eddyLat, eddyLon, eddyAmp, eddyU, eddyIdx, EddyPixelCount]...
= calcClosest(lat, lon, antiCyc, cyc, p2ll)
consider_threshold = 20.0;
% p2ll = load('/project/expeditions/eddies_project_data/ssh_data/data/pixels_2_lat_lon_map.mat');
distanceToEddy = Inf('double');
EddyIndex = [0 0]; % Type [-1,1] and index
for i=1 : size(antiCyc.eddies,2)
latProximity = abs(lat - antiCyc.eddies(i).Lat);
lonProximity = abs(lon - antiCyc.eddies(i).Lon);
% Restrict the search area
if(latProximity <= 3.0 && lonProximity <= 3.0)
pixelLatLons = pid2latlon(antiCyc.eddies(i).Stats.PixelIdxList, p2ll.latLonMap);
pixelLatLons(:,2) = pixelLatLons(:,2) - 360;
distances = zeros(size(pixelLatLons,1),1);
% for j = 1 : size(distances,1)
% distances(j) = geoddistance(lat, lon, pixelLatLons(j,1),...
% pixelLatLons(j,2));
% end
for j = 1 : size(distances,1)
distances(j) = deg2km(distance(lat,lon,pixelLatLons(j,1),...
pixelLatLons(j,2)));
end
[d,di] = min(distances);
% d = d/1000;
if(d <= consider_threshold)
if(d < distanceToEddy)
distanceToEddy = d;
EddyIndex = [1, i];
eddyLat = antiCyc.eddies(i).Lat;
eddyLon = antiCyc.eddies(i).Lon;
eddyAmp = antiCyc.eddies(i).Amplitude;
eddyU = antiCyc.eddies(i).MeanGeoSpeed;
eddyIdx = i;
end
end
else
% do nothing
end
end
for i=1 : size(cyc.eddies,2)
latProximity = abs(lat - cyc.eddies(i).Lat);
lonProximity = abs(lon - cyc.eddies(i).Lon);
% Restrict the search area
if(latProximity <= 3.0 && lonProximity <= 3.0)
pixelLatLons = pid2latlon(cyc.eddies(i).Stats.PixelIdxList, p2ll.latLonMap);
pixelLatLons(:,2) = pixelLatLons(:,2) - 360;
distances = zeros(size(pixelLatLons,1),1);
% for j = 1 : size(distances,1)
% distances(j) = geoddistance(lat, lon, pixelLatLons(j,1),...
% pixelLatLons(j,2));
% end
for j = 1 : size(distances,1)
distances(j) = deg2km(distance(lat,lon,pixelLatLons(j,1),...
pixelLatLons(j,2)));
end
[d,di] = min(distances);
% d = d/1000;
if(d <= consider_threshold) %10 km
if(d < distanceToEddy)
distanceToEddy = d;
EddyIndex = [-1, i];
eddyLat = cyc.eddies(i).Lat;
eddyLon = cyc.eddies(i).Lon;
eddyAmp = cyc.eddies(i).Amplitude;
eddyU = cyc.eddies(i).MeanGeoSpeed;
eddyIdx = i;
end
end
else
% do nothing
end
end
% Found something
if(EddyIndex(1,1) == 1)
%proxType = NaN; % for now %TODO: calculate eddy boundaries
eddyClass = 1;
%eddyStruct = antiCyc.eddies(EddyIndex(2));
elseif (EddyIndex(1,1) == -1)
%proxType = NaN;
eddyClass = -1;
%eddyStruct = cyc.eddies(EddyIndex(2));
% Found nothing
else
%proxType = NaN;
eddyClass = NaN;
eddyLat = NaN;
eddyLon = NaN;
eddyAmp = NaN;
eddyU = NaN;
eddyIdx = NaN;
%eddyStruct = NaN;
end
end