How to subset the matrix/array with shape file?

14 次查看（过去 30 天）
Shakir Hussain
Shakir Hussain 2018-6-26
评论： Adi Mulsandi 2020-10-22
I have matrix of 890*751 and array 890*751*5 and I want to clip/crop/subset this matrix and array with shape file. The shape file is consist on several sub-polygon inside. Each inside sub-polygon of shape file has to clip/crop/subset separately and save with unique name. E.g, we have a shape file with 4 sub-polygon (with name (a,b,c,d) and we have to get 4 clip/crop/subset(a,b,c,d) of the matrix/array with. we can read the shape file by
area = shaperead('shapefile', 'UseGeoCoords', true);
geoshow( area , 'Facecolor', 'blue')
but no idea how to crop/clip/subset the matrix/array. The sample testmatrix, testarray and shapefile are attached here for easy to understand the question. Thank you in advance for any helpe/guide

请先登录，再回答此问题。

采纳的回答

KSSV
KSSV 2018-6-26
编辑：KSSV 2018-6-26
Check this link for a similar question. You can follow the same code.
https://in.mathworks.com/matlabcentral/answers/403555-how-to-extract-data-through-the-shapefile-india-from-global-precipitation-data
shapefile = 'shapefile.shp' ;
S = shaperead(shapefile) ;
N = length(S) ;
for i = 1:N
plot(S(i).X,S(i).Y)
hold on
end
lon = load('testlon.mat') ; lon = lon.testlon ;
lat = load('testlat.mat') ; lat = lat.testlat ;
[X,Y] = meshgrid(lon,lat) ;
data = load('testarray.mat') ; data = data.testarray ;
[nx,ny,d] = size(data) ;
%%Extract data
iwant = cell(d,N) ;
for i =1:d
A = data(:,:,i) ;
for j = 1:N
idx = inpolygon(X(:),Y(:),S(i).X,S(i).Y) ;
iwant{i,j} = A(idx) ;
end
end
  10 个评论
显示 8更早的评论
Shakir Hussain
Shakir Hussain 2018-8-19
Yes, Now it is fixed and code is working well. Last thing is how we convert the result (iwant) into 2d matrix according to the polygon extend?
Adi Mulsandi
Adi Mulsandi 2020-10-22
Hi Shakir Hussain can you share how to convert the result (iwant) into 2d matrix according to the polygon extend?

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 3-D Visualization 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by