matlab学习笔记（1）

matlab学习笔记（1）
1）只让某一区域的点显示
[xv,yv] = ginput(); %选择合适的区域
xvs = [xv’ xv(1)];
yvs = [yv’ yv(1)];
in = inpolygon(X,Y,xvs,yvs); %X,Y为实际所有的点
plot(xvs,yvs,X(in),Y(in),‘r.’);

2）过滤某一区域的点迹内容
hh = imrect; %和imcrop 函数相结合,就可以实现截图功能
pos = getPosition(hh); %%获取特定区域的坐标
row1 = pos(1);
row2 = pos(1)+pos(3);
col1 = pos(2);
col2 = pos(2)+pos(4);
ax = aa(find(xx>row1&xx<row2&yy>col1&yy<col2))；%aa为点迹的内容信息

3）将点迹信息保存到kml文件
kmlFileName = ‘xx.kml’;
kmlwrite(kmlFileName,lats,lons);