Matlab 画图，根据shp地图文件白化？？？

Touuqu

data=load('data.txt');
lat=data(:,1);
lon=data(:,2);
rain=data(:,3);
& S: z" T* i% T/ G% g7 `clear data
# e5 j- p* G( S, T  clevel0=find(rain==0);
level1=find(rain>0&rain<=0.1);
level2=find(rain>0.1&rain<=0.5);
level3=find(rain>0.5&rain<=1);
% @* ~, Y8 U2 F6 e; alevel4=find(rain>1&rain<=5);
$ v9 @6 ^$ x) a, Elevel5=find(rain>5&rain<=10);
level6=find(rain>10);
rain(level0)=nan;
rain(level1)=1;
& f4 t/ p* T& y/ G+ Mrain(level2)=2;
2 |& Q  j8 P8 G" Crain(level3)=3;
) `, Y( z8 B: m" i: Crain(level4)=4;
' M. a# D$ M9 l% p/ B7 [rain(level5)=5;
) I2 A# [& S) o) m; b; O$ u  r* `rain(level6)=6;

cmap=[255,255,255;0,255,3;0,255,253;0,0,254;255,253,6;249,2,255;254,0,2]/255;
figure
! J9 B& q+ n$ Y  Jset(gcf,'position',[100 100 800 650])
scatter(lon,lat,10,rain,'fill')
set(gca,'fontsize',18,'linewidth',1.5,'box','on')
xlim([floor(min(lon))-1 floor(max(lon))+1])
ylim([floor(min(lat))-1 floor(max(lat))+1])
ylabel('Latitude')
, k+ z4 C5 L* i) q+ {% O2 Xxlabel('Longitude')
colormap(cmap)
9 {3 z, [9 G! q& L. t- scb=colorbar;
5 `  c( J1 z1 v0 Pcaxis([-0.5 6.5])
* {# W- i7 g& }/ t6 Kset(cb,'ytick',-0.5:1:6.5,'yticklabel',{'','0','0.1','0.5','1','5','10','15'})

用matlanb画了一张散点图，现在要根据.shp文件，加上地图，并且白化地图区域外，求大神帮帮忙

7 K3 w* C) t4 m; g% t. h

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