How to transform multiple sets of coordinates in a csv file into a single shapefile

Question

Blue 2021-1-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/723388-how-to-transform-multiple-sets-of-coordinates-in-a-csv-file-into-a-single-shapefile

回答： Rohit Pappu 2021-1-25

test.csv

Hi,

I was wondering what was the easiest way to transform the coordinates of multiple polygons in a csv file into a single shapefile ? In the attached file I have multiple polygons with their corresponding latitudee and longitude coordinates and I would like to transform these into a single shapefile consisting of four polygons. I would also like to set the projection to mercator.

How do I do that ?

Thank you,

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Answer 1

Rohit Pappu 2021-1-25

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https://ww2.mathworks.cn/matlabcentral/answers/723388-how-to-transform-multiple-sets-of-coordinates-in-a-csv-file-into-a-single-shapefile#answer_605518

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A possible workaround is as follows

% Read the data from the csv file (exclude the header row)
data = readcell("test.csv","NumHeaderLines",1);
% Create an empty struct array with required field names
d = struct('Geometry','','Lat',[],'Lon',[],'Name','');
% Since there are 4 polygons, iterate four times
for i =1:4
    % Define the starting and ending row for each polygon (Every 6th row is filled with NaNs)
    first = 6*(i-1)+1;
    last = 6*i-1;
    % Set the fields for a dummy struct
    Data.Geometry='Polygon';
    Data.Lat = cell2mat(data(first:last,2));
    Data.Lon = cell2mat(data(first:last,3));
    Data.Name = cell2mat(data(first,1));
    % Store the data in the struct array
    d(i) = Data;
end
% Write struct array to shapefile
shapewrite(d,'myfile.shp');
% Verify if data has been written correctly or not
P = shaperead('myfile.shp')