\begin{frame}{Joining Parcels}
\begin{figure}[!h]
	\label{compare}
	\centering
  \begin{subfigure}[b]{0.4\textwidth}
	  \includegraphics[width=\textwidth]{./RG_img/pre_proc.png}
    \caption{Crop Parcels and Legal Parcels}
    \label{pre}
  \end{subfigure}
  %
  \begin{subfigure}[b]{0.4\textwidth}
	  \includegraphics[width=\textwidth]{./RG_img/post_proc.png}
    \caption{Intersection of Parcels}
    \label{post}
  \end{subfigure}
\end{figure}
\end{frame}