Hi,
As per my understanding you want to change the pixel values of a geo-reference TIFF File and save the modified while retaining the spatial reference information.
Use the "readgeoraster" function to read the TIFF file. Also, get the "info" using "georasterinfo" function.
[originalImg,R] = readgeoraster('filename.tif');
info = georasterinfo("filename.tif");
"R" in the above code is the spatial reference.
Modify the image by changing the pixel values.
modifiedImage = A;
modifiedImage(modifiedImage < 100) = 200; % (example)
Get the Geo Tags.
geoTags = info.GeoTIFFTags.GeoKeyDirectoryTag;
Write the modified TIFF file as shown below. Set the spatial reference as the original image.
geotiffwrite("mod.tif",modifiedImage,R,'GeoKeyDirectoryTag',geoTags)
Refer to the below MathWorks documentation link to learn more about "readgeoraster" function.
Refer to the below MathWorks documentation link to learn more about "georasterinfo" function.
Refer to the below MathWorks documentation link to learn more about "geotiffwrite" function.
Hope it helps!
