How to write a matrix into Geotiff file?

The instruction provided by Mathworks says this "geotiffwrite(filename,A,R) writes a georeferenced image or data grid, A, spatially referenced by R, into an output file, filename."

My question is what exactly is R?

I have a matrix Z the size of 181 x 361, and I want to save it as a Geotiff file so that my friend can read it into ArcGIS. I tried

geotiffwrite('a.tif', Z, size(Z))

and it did not work;

[Waqas Ahmad]

R is a georeferencing matrix which specifies the position of your grtid (matrix Z) on the world map when you open the geotif in arcgis. See refmatToGeoRasterReference documentation https://kr.mathworks.com/help/map/ref/refmattogeorasterreference.html

Answer 1

[Dasharath Gulvady]

According to the documentation R is:

spatialref.GeoRasterReference object, referencing matrix, or referencing vector; or spatialref.MapRasterReference object or referencing matrix. Provides spatial referencing information.

You may use "georasterref" to create a reference matrix from your matrix.

http://www.mathworks.com/help/map/ref/georasterref.html?searchHighlight=georasterref