0
\begin{table}
\begin{center}
     \caption{Types of Aggregation}
    \label{table:my_label1}

    \begin{tabular}{|c |c| c| c|}
    \multicolumn{4}{c}{}{$\overbrace{\rule{12.5em}{0pt}}^{Spatial Aggregation}$}\\
    \hline

     Meters & $time_1$ & $time_2$ & $time_3$ \\ [0.5ex]
    \hline

     $SM_{1}$ & $R_{1,1}$ & $R_{1,2}$ & $R_{1,3}$\\
    \hline
     $SM_2$  & $R_{2,1}$ & $R_{2,2}$ & $R_{2,3}$\\
    \hline
     $SM_3$  & $R_{3,1}$ & $R_{3,2}$ & $R_{3,3}$\\ 
    \hline

    \end{tabular}
\end{center}
\end{table}

I want to name the 2nd, 3rd and 4th column using \overbrace. How can I do that?

3

Welcome to TeX-SE! Assuming you want something similar to your code, you could use

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{table}
\centering
 \caption{Types of Aggregation}
 \label{table:my_label1}
 \begin{tabular}{|c |c| c| c|}
  \multicolumn{1}{c}{}& 
  \multicolumn{3}{c}{$\overbrace{\rule{9.5em}{0pt}}^{\text{Spatial
   Aggregation}}$}\\
    \hline
     Meters & $\text{time}_1$ & $\text{time}_2$ & $\text{time}_3$ \\ [0.5ex]
    \hline
     $SM_{1}$ & $R_{1,1}$ & $R_{1,2}$ & $R_{1,3}$\\
    \hline
     $SM_2$  & $R_{2,1}$ & $R_{2,2}$ & $R_{2,3}$\\
    \hline
     $SM_3$  & $R_{3,1}$ & $R_{3,2}$ & $R_{3,3}$\\ 
    \hline
  \end{tabular}
\end{table}
\end{document}

enter image description here

2

You can use \downbracefill, similar to what is suggested in Using \underbrace with table columns:

enter image description here

\documentclass{article}

\begin{document}

\begin{tabular}{| *{4}{c |} }
  \multicolumn{1}{c}{} & \multicolumn{3}{c}{\small Spatial aggregation} \\[-.3\normalbaselineskip]
  \multicolumn{1}{c}{} & \multicolumn{3}{c}{\downbracefill} \\
  \hline
  Meters & $time_1$ & $time_2$ & $time_3$ \\
  \hline
  $SM_1$ & $R_{1,1}$ & $R_{1,2}$ & $R_{1,3}$  \\
  \hline
  $SM_2$ & $R_{2,1}$ & $R_{2,2}$ & $R_{2,3}$  \\
  \hline
  $SM_3$ & $R_{3,1}$ & $R_{3,2}$ & $R_{3,3}$  \\ 
  \hline
\end{tabular}

\end{document}

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