How can I convert some pixels of a satellite image (raster) into point (shapefile)?

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naeim mj 2021-12-12

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https://ww2.mathworks.cn/matlabcentral/answers/1609440-how-can-i-convert-some-pixels-of-a-satellite-image-raster-into-point-shapefile

回答： gmflores 2022-10-11

I have a raster image (satellite image) that I need to convert some pixels (for example, pixels >1) in the image to point (shapefile). How can I do this?

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Answer 1

gmflores 2022-10-11

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1609440-how-can-i-convert-some-pixels-of-a-satellite-image-raster-into-point-shapefile#answer_1070958

在 MATLAB Online 中打开

Read the image and select some pixels (uses Mapping Toolbox)

[img,R] = readgeoraster('boston.tif','OutputType','double','Bands',1);
idx = find(img < 5); 

Get the location of the pixels (X, Y), create a mappoint vector, and write the shapefile

[X,Y] = meshgrid(linspace(R.XWorldLimits(1), R.XWorldLimits(2), R.RasterSize(2)), linspace(R.YWorldLimits(1), R.YWorldLimits(2), R.RasterSize(1)));
shp = mappoint(X(idx), Y(idx), 'pixValue', img(idx));
shapewrite(shp,'boston_points');