From 36a565be149d062bd2a2e2b07b5c046693c5825b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Motiejus=20Jak=C5=A1tys?= Date: Wed, 19 May 2021 22:57:50 +0300 Subject: [PATCH] address more andriub comments --- mj-msc.tex | 54 ++++++++++++++++++++++++++++++++++++------------------ 1 file changed, 36 insertions(+), 18 deletions(-) diff --git a/mj-msc.tex b/mj-msc.tex index acf67e9..6de006d 100644 --- a/mj-msc.tex +++ b/mj-msc.tex @@ -321,6 +321,13 @@ figure~\onpage{fig:salvis-generalized-chaikin-50k}. \label{fig:salvis-overlaid-generalized-chaikin-50k} \end{figure} +\begin{figure}[b!] + \centering + \includegraphics[width=.9\textwidth]{amalgamate1} + \caption{Narrow bends amalgamating into large unintelligible blobs.} + \label{fig:pixel-amalgamation} +\end{figure} + The resulting simplified and smoothened example (figure~\onpage{fig:salvis-generalized-chaikin-50k}) yields a more aesthetically pleasing result, however, it obscures natural river features. @@ -351,12 +358,6 @@ classical algorithms would remove these bends altogether. A cartographer would retain a few of those distinctive bends, but would increase the distance between the bends, remove some of the bends, or both. -\begin{figure}[ht] - \includegraphics[width=\textwidth]{amalgamate1} - \caption{Narrow bends amalgamating into large unintelligible blobs.} - \label{fig:pixel-amalgamation} -\end{figure} - For the reasons discussed in this section, the "classical" {\DP} and {\VW} are not well suited for natural river generalization, and a more robust line generalization algorithm is worthwhile for to look for. @@ -385,8 +386,6 @@ have emerged. These modern replacements fall into roughly two categories: \end{itemize} -% TODO: [Šioje vietoje turi būti WM algoritmo pristatymas su iliustracijomis. Turi būti bent minimalus, ne sakinio, paaiškinimas, kodėl algoritmas tinkamas kartografijai. Kodėl jis pasirinktas realizuoti - o čia ir Tomas ir aš buvome parašę email: išlaikant raiškius naturalių objektų kontūrus, generalizacijos rezultatas žemėlapyje geriau atspindi gamtinės aplinkos savybes, pvz. upių vingiuotumą, kuris gali atspindėti reljefo bei kitas paviršiaus savybes ir pan.] - Authors of most of the aforementioned articles have implemented the generalization algorithm, at least to generate the illustrations in the articles. However, code is not available for evaluation with a desired data @@ -395,6 +394,34 @@ set, much less for use as a basis for creating new maps. To author's knowledge, purchase of the commercial product suite, without a way to license the standalone algorithm. +{\WM} algorithm was created by encoding professional cartographers' knowledge +into a computer algorithm. It has a few main properties which make it +especially suitable for generalization of natural linear features: + +\begin{itemize} + \item Small bends are not always removed, but either combined (for example, + 3 bends into 2), exaggerated, or removed, depending on the neighboring + bends. + \item Long and gentle bends are not straightened, but kept as-is. +\end{itemize} + +\begin{figure}[h] + \centering + \includegraphics[width=.8\textwidth]{wang125} + \caption{Originally figure 12.5: cartographic line generalization example.} + \label{fig:wang125} +\end{figure} + +As a result of these properties, {\WM} algorithm retains the defining +properties of the natural features; high-current rivers keep their appearance +as such, instead of becoming canals; low-stream bendy rivers retain their +frequent small bends. + +Figure~\ref{fig:wang125} (from the original \titlecite{wang1998line}) +illustrates the {\WM} algorithm (the figure labeled "proposed method"). + +% TODO DONE: [Šioje vietoje turi būti WM algoritmo pristatymas su iliustracijomis. Turi būti bent minimalus, ne sakinio, paaiškinimas, kodėl algoritmas tinkamas kartografijai. Kodėl jis pasirinktas realizuoti - o čia ir Tomas ir aš buvome parašę email: išlaikant raiškius naturalių objektų kontūrus, generalizacijos rezultatas žemėlapyje geriau atspindi gamtinės aplinkos savybes, pvz. upių vingiuotumą, kuris gali atspindėti reljefo bei kitas paviršiaus savybes ir pan.] + \subsection{Problematic with generalization of rivers} % DONE subscection: andriub: Į šį skyrių turi būti perkeltas tekstas iš From Simplification to Generalization ir mano pakomentuota dalis iš Modern approaches skyriaus. @@ -495,19 +522,10 @@ We are limiting the problem to cartographic line generalization. That is, full cartographic generalization, which takes topology and other feature classes into account, is out of scope. -Figure~\ref{fig:wang125} illustrates {\WM} algorithm from their original +Figure~\onpage{fig:wang125} illustrates {\WM} algorithm from their original paper. Note how the long bends retain curvy, and how some small bends got exaggerated. -\begin{figure}[ht] - \centering - \includegraphics[width=.8\textwidth]{wang125} - - \caption{Originally figure 12.5: cartographic line generalization example.} - - \label{fig:wang125} -\end{figure} - \section{Methodology} \label{sec:methodology} % andriub: Šio skyriaus poskyriai turėtų būti išdėstyti tokia tvarka: