\documentclass{article}
\usepackage[pdftex,active,tightpage]{preview}
\setlength\PreviewBorder{2mm}
\usepackage{tikz}
\usepackage{tkz-fct}
\usetikzlibrary{shapes.misc}
\usetikzlibrary{shapes, calc, decorations}
\usepackage{amsmath,amssymb}

\begin{document}
\begin{preview}
\begin{tikzpicture}[cross/.style={    thick,
    draw=gray,
    cross out,
    inner sep=0pt,
    minimum width=4pt,
    minimum height=4pt},
dot/.style={    thick,
    draw=gray,
	circle,
	fill=black,
    inner sep=0pt,
    minimum width=4pt,
    minimum height=4pt}]
\node at (0,3) {Schritt 1:};
\foreach \point in {(2,3),(4,3),(6,3),(8,3),(10,3),(12,3)}{
	\node[cross] at \point {};
}
\foreach \point in {(3,3),(11,3)}{
	\node[dot] at \point {};
}

\draw[->] (2,3) edge[bend left] (2.9,3);
\draw[->] (12,3) edge[bend right] (11.1,3);
%%%%%%%%%%%%%%%%%%%%%%%%
\node at (0,2) {Schritt 2:};
\foreach \point in {(3,2),(4,2),(6,2),(8,2),(10,2),(11,2)}{
	\node[cross] at \point {};
}
\foreach \point in {(3.5,2),(4.33,2),(9.66,2),(10.5,2)}{
	\node[dot] at \point {};
}

\draw[->] (3,2) edge[bend left] (3.4,2);
\draw[->] (4,2) edge[bend left] (4.2,2);
\draw[->] (11,2) edge[bend right] (10.6,2);
\draw[->] (10,2) edge[bend right] (9.73,2);
%%%%%%%%%%%%%%%%%%%%%%%%
\node at (0,1) {Schritt 3:};
\node[cross] at (7,1) {};

\node at (0,1.6) {$\vdots$};
\node at (0,2.6) {$\vdots$};


% Brace
\draw [decorate,decoration={brace,amplitude=6pt},yshift=3pt]
(2,3) -- (4,3) node [black,midway,yshift=12pt]
{\footnotesize 200m};
\draw [decorate,decoration={brace,amplitude=6pt},yshift=3pt]
(4,3) -- (6,3) node [black,midway,yshift=12pt]
{\footnotesize 200m};
\draw [decorate,decoration={brace,amplitude=6pt},yshift=3pt]
(6,3) -- (8,3) node [black,midway,yshift=12pt]
{\footnotesize 200m};
\draw [decorate,decoration={brace,amplitude=6pt},yshift=3pt]
(8,3) -- (10,3) node [black,midway,yshift=12pt]
{\footnotesize 200m};
\draw [decorate,decoration={brace,amplitude=6pt},yshift=3pt]
(10,3) -- (12,3) node [black,midway,yshift=12pt]
{\footnotesize 200m};

\end{tikzpicture}
\end{preview}
\end{document}
