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mainStep2.m
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% Spatial calibration and PM2.5 mapping
% Step-2 ploting and RMSE evaluation
% by Hone-Jay Chu
clear all;
grid=0.05;
neigh=30;
%plot GWR or LR result
% 1: run GWR maps
% others: run LR maps
plotGWR=0;
SS = shaperead('.\Data\TWN_shp\gadm36_TWN_0.shp');
[num1, text1, rawData1] =xlsread('.\Data\Newcase\1\EPA.csv');
load result;
% Showing original data, yhat by GWR, yhat0 by LR
if (plotGWR==1)
PM=yhat;
else
PM=yhat0;
end
% data clearing
loc=find( isnan(PM));
PM(loc)=[];
xx(loc)=[];
yy(loc)=[];
loc=find ((PM<0)|(PM>180));
PM(loc)=[];
xx(loc)=[];
yy(loc)=[];
loc=find ((xx<120)|(xx>130));
PM(loc)=[];
xx(loc)=[];
yy(loc)=[];
loc=find ((yy<20)|(yy>25.5));
PM(loc)=[];
xx(loc)=[];
yy(loc)=[];
loc=find ((xx==121.4930)&(yy==22.6740));
PM(loc)=[];
xx(loc)=[];
yy(loc)=[];
loc=find ((xx==120.368)&(yy==22.337));
PM(loc)=[];
xx(loc)=[];
yy(loc)=[];
loc=find ((xx==120.369)&(yy==22.335));
PM(loc)=[];
xx(loc)=[];
yy(loc)=[];
loc=find ((xx==121.491)&(yy==23.846));
PM(loc)=[];
xx(loc)=[];
yy(loc)=[];
xmin=min(xx);
xmax=max(xx);
ymin=min(yy);
ymax=max(yy);
[x] =(xmin:grid:xmax)';
[y] =(ymax:-grid:ymin)';
% IDW
z0=IDW(xx,yy,PM,x,y,-2,'ng',neigh);
for i=1:length(SS)
XX{i}=SS(i,1).X;
YY{i}=SS(i,1).Y;
end;
[X00,Y00] = meshgrid(x,y);
in = inpolygon(X00,Y00,SS(i,1).X',SS(i,1).Y');
z0((in~=1))=nan;
figure;
h=imagesc(z0);
set(h,'alphadata',~isnan(z0));
axis equal;axis off;
colorbar;
%[num1, text1, rawData1] =xlsread('.\Newcase\1\EPA.csv');
row=size(num1,1);
loc=find( isnan(num1(:,1)));
num1(loc,:)=[];
%
% Mapping error
for k=1:length(num1)
X0(k,1)=num1(k,23);
Y0(k,1)=num1(k,18);
Z0(k,1)=num1(k,1);
row1(k,1)=ceil((Y00(1,1)-Y0(k,1))/grid+1);
col1(k,1)=ceil((X0(k,1)-X00(1,1))/grid);
end
E=0;
loc1=find(row1<0|col1<0);
row1(loc1)=[];
col1(loc1)=[];
Z0(loc1)=[];X0(loc1)=[];Y0(loc1)=[];
loc1=find(row1>size(z0,1)|col1>size(z0,2));
row1(loc1)=[];
col1(loc1)=[];
Z0(loc1)=[];X0(loc1)=[];Y0(loc1)=[];
loc1=find(isnan(row1)==1);
row1(loc1)=[];
col1(loc1)=[];
Z0(loc1)=[];X0(loc1)=[];Y0(loc1)=[];
loc1=find(isnan(col1)==1);
row1(loc1)=[];
col1(loc1)=[];
Z0(loc1)=[];X0(loc1)=[];Y0(loc1)=[];
for k=1: length(col1)
% Error
E(k,1)=z0((row1(k)),(col1(k)))-Z0(k);
end
loc1=find(E<-100);
E(loc1)=[];
% RMSE
RMSE = sqrt(nanmean((E).^2));