\section{Principles} % Principles \subsection{Polygon basics} \subsubsection{Topological aspects} \subsection{LineString simplification} \subsubsection{Positional errors} \subsubsection{Length errors} \subsubsection{Area Errors} \subsection{Runtimes on the Web} \subsubsection{Webassembly} \subsection{Coordinate representation} \paragraph{in Javascript} \paragraph{in C} \paragraph{in C++} \subsection{Data Formats} \subsection{GeoJSON} \subsection{TopoJSON}