\documentclass[landscape]{article}

\usepackage{graphicx}

\begin{document}

 \begin{figure}
 \centering
 %\includegraphics[totalheight=0.8\textheight,viewport=50 260 400 1000,clip]{erptsqfit}
 \includegraphics{uml}
 %\caption[UML Diagram for the CFA translator] %\label{fig:erptsqfit}
 \end{figure}

\end{document}