How to display DTM (.img) in Matlab

Now I have a DTM, I read it in Matlab using the following code. And the data is a 301989888 x 1 matrix. I try to display it, but it is too big and my Matlab just break down each time. Could someone give me some advices about how to do this?

fid = fopen('DTM_MAP_02_N24E000N21E003SC.img'); 
data = fread(fid);
fclose(fid);