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Motiejus Jakštys 2021-05-19 22:57:52 +03:00 committed by Motiejus Jakštys
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mj-msc.tex
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@ -697,8 +697,10 @@ functions\cite{postgisref} for working with geometric and geographic objects.
Due to its wide applicability and rich library of spatial functions, PostGIS is
the implementation language of the {\WM} algorithm. The implementation exposes
the entrypoint function \textsc{st\_simplifywm}:
the entrypoint function \textsc{st\_simplifywm}, in
listing~\ref{lst:st-simplifywm}.
\begin{listing}
\begin{minted}[fontsize=\small]{sql}
create function ST_SimplifyWM(
geom geometry,
@ -706,7 +708,10 @@ create function ST_SimplifyWM(
intersect_patience integer default 10,
dbgname text default null
) returns geometry
\end{minted}
\end{minted}
\caption{Function \textsc{st\_simplifywm}.}
\label{lst:st-simplifywm}
\end{listing}
This function accepts the following parameters:
\begin{description}
@ -1392,21 +1397,14 @@ Our generalized results are viewed from the following angles:
\subsubsection{Medium-scale (1:\numprint{50000})}
\label{sec:analyzed-medium-scale}
\begin{figure}[h]
\begin{figure}[h!]
\centering
\includegraphics[width=\textwidth]{salvis-wm75--grpk10-1x50k}
\caption{2x zoomed-in {\WM} for 1:\numprint{50000}.}
\label{fig:salvis-wm75--grpk10-1x50k}
\end{figure}
\begin{figure}[h]
\centering
\includegraphics[width=\textwidth]{salvis-wm75--grpk10-1x50ktl}
\caption{Left part of Figure~\ref{fig:salvis-wm75--grpk10-1x50k}.}
\label{fig:salvis-wm75--grpk10-1x50ktl}
\end{figure}
\begin{figure}[h]
\begin{figure}[h!]
\centering
\includegraphics[width=\textwidth]{salvis-wm75--grpk10-1x50ktr}
\caption{Top--right part of Figure~\ref{fig:salvis-wm75--grpk10-1x50k}.}
@ -1467,8 +1465,6 @@ A conglomeration of bends is visible, especially in top--right side of the
illustration. We assume this was caused by two bends significantly exaggerated,
leaving no space to exaggerate for those between the two.
\clearpage
\subsubsection{Discussion}
For mid-size scales of 1:\numprint{50000}, the implemented algorithm works well
@ -1508,11 +1504,9 @@ downloaded for free from \cite{nzt}. Here are the meanings of the codenames:
\end{description}
During the analysis, we ran {\WM} on GRPK10 for 2 destination scales:
1:\numprint{50000} and 1:\numprint{250000}.\footnote{How parameters are
calculated is detailed in section~\ref{sec:bend-scaling-and-dimensions}.} This
section compares the resulting {\WM}--generalized rivers to GRPK50 and GRPK250.
\clearpage
1:\numprint{50000} and 1:\numprint{250000}.\footnote{parameter calculation is
detailed in section~\ref{sec:bend-scaling-and-dimensions}.} This section
compares the resulting {\WM}--generalized rivers to GRPK50 and GRPK250.
\subsubsection{Medium-scale (1:\numprint{50000})}
@ -1530,6 +1524,13 @@ original GRPK10.
\label{fig:salvis-wm75-grpk50-grpk10-1x50k}
\end{figure}
\begin{figure}[h!]
\centering
\includegraphics[width=\textwidth]{salvis-wm75-grpk50-grpk10-1x50ktl}
\caption{Left side of Figure~\ref{fig:salvis-wm75-grpk50-grpk10-1x50k}.}
\label{fig:salvis-wm75-grpk50-grpk10-1x50ktl}
\end{figure}
\begin{figure}[h!]
\centering
\includegraphics[width=\textwidth]{salvis-wm75-grpk50-grpk10-1x50ktr}
@ -1632,8 +1633,6 @@ produces poorly simplified results for some geometries.
\label{fig:openmap-wm-bad}
\end{figure}
\clearpage
\section{Conclusions}
\label{sec:conclusions}