add more river examples
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Motiejus Jakštys
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IV/Makefile
22
IV/Makefile
@ -23,9 +23,9 @@ FIGURES = \
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selfcrossing-1-after
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RIVERS = \
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salvis-gdr10 \
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salvis-gdr50 \
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salvis-gdr250
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salvis-25k \
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salvis-50k \
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salvis-250k
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#################################
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# The thesis, publishable version
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@ -121,15 +121,17 @@ selfcrossing-1-after_1SELECT = wm_debug where name='selfcrossing-1' AND stage='d
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selfcrossing-1-after_2SELECT = wm_debug where name='selfcrossing-1' AND stage='bbends' AND gen=1
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selfcrossing-1-after_2LINESTYLE = invisible
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salvis-gdr10_1SELECT = wm_rivers where name='Šalčia' OR name='Visinčia'
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salvis-gdr10_WMCLIP = salcia-visincia:GDR10
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salvis-25k_1SELECT = wm_rivers where name='Šalčia' OR name='Visinčia'
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salvis-25k_WMCLIP = salcia-visincia:25k
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salvis-25k_WIDTHDIV = 1
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salvis-gdr50_1SELECT = wm_rivers where name='Šalčia' OR name='Visinčia'
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salvis-gdr50_WMCLIP = salcia-visincia:GDR50
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salvis-gdr250_1SELECT = wm_rivers where name='Šalčia' OR name='Visinčia'
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salvis-gdr250_WMCLIP = salcia-visincia:GDR250
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salvis-50k_WIDTHDIV = 2
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salvis-50k_1SELECT = wm_rivers where name='Šalčia' OR name='Visinčia'
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salvis-50k_WMCLIP = salcia-visincia:50k
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salvis-250k_WIDTHDIV = 10
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salvis-250k_1SELECT = wm_rivers where name='Šalčia' OR name='Visinčia'
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salvis-250k_WMCLIP = salcia-visincia:250k
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.faux_test-rivers: tests-rivers.sql wm.sql .faux_db
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./db -f $<
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@ -17,9 +17,10 @@ PSQL_CREDS = "host=127.0.0.1 dbname=osm user=osm password=osm"
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TEXTWIDTH_CM = 12.12364
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SCALES = {
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"GDR10": 10000,
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"GDR50": 50000,
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"GDR250": 250000,
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"10k": 10000,
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"25k": 25000,
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"50k": 50000,
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"250k": 250000,
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}
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def inch(cm):
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@ -52,7 +53,7 @@ def parse_args():
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parser.add_argument('--wmclip',
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type=wm_clip,
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help="Clip for scale. E.g. salcia-visincia:GDR10",
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help="Clip for scale. E.g. salcia-visincia:10k",
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)
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parser.add_argument('--widthdiv',
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default=1, type=float, help='Width divisor')
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@ -85,7 +85,7 @@ Current open-source line generalization solutions have their roots in
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NOTICE: this value should be copied to layer2img.py:TEXTWIDTH, so dimensions
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of inline images are reasonable.
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textwidth in cm: {\printinunitsof{cm}\prntlen{\textwidth}}
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Textwidth in cm: {\printinunitsof{cm}\prntlen{\textwidth}}
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\fi
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When creating small-scale maps, often the detail of the data source is greater
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@ -129,7 +129,8 @@ different trade-offs.
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\label{sec:literature-review}
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A number of cartographic line generalization algorithms have been researched.
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The "classical" ones are {\DP} and {\VW}.
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The "classical" ones are {\DP} and {\VW} in combination with Chaikin's. There
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are also modern ones.
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\subsection{Available algorithms}
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@ -150,13 +151,43 @@ Both algorithms are part of PostGIS, a free-software GIS suite:
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\href{https://postgis.net/docs/ST_SimplifyVW.html}{PostGIS SimplifyVW}.
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\end{itemize}
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Examples of <TBD Chaikin and others>
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It may be worthwhile to post-process those through a widely available Chaikin's
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line smoothing algorithm \cite{chaikin1974algorithm} via
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\href{https://postgis.net/docs/ST_ChaikinSmoothing.html}{PostGIS
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ChaikinSmoothing}.
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To use in generalization examples, we will use two rivers: Žeimena and Šalčia
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(they flow into one). Figure~\onpage{fig:salvis-25} illustrates the original
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two rivers without any processing (yet).
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\begin{figure}[h]
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\centering
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\includegraphics[width=\textwidth]{salvis-25k}
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\caption{Example rivers for visual tests (1:25000)}
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\label{fig:salvis-25}
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\end{figure}
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Same rivers, unprocessed, but with higher density (scales 1:50000 and 1:250000)
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are depicted in figure~\onpage{fig:salvis-50-250}. Some river features are so
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compact that a reasonably thin line depicting them is overlapping with itself.
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As can be seen in the article example, generalization is worthy.
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\begin{figure}[h]
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\centering
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\begin{subfigure}[b]{.49\textwidth}
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\includegraphics[width=\textwidth]{salvis-50k}
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\caption{Example scaled 1:50000}
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\end{subfigure}
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\hfill
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\begin{subfigure}[b]{.49\textwidth}
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\centering
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\includegraphics[width=.2\textwidth]{salvis-250k}
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\caption{Example scaled 1:250000}
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\end{subfigure}
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\caption{Down-scaled original river (1:50000 and 1:250000)}
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\label{fig:salvis-50-250}
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\end{figure}
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\subsubsection{Modern approaches}
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@ -359,12 +390,12 @@ when a single vertex is moved outwards the end of the bend.
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\begin{figure}[h]
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\centering
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\begin{subfigure}[b]{.45\textwidth}
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\begin{subfigure}[b]{.49\textwidth}
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\includegraphics[width=\textwidth]{fig5-gentle-inflection-before}
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\caption{Before applying the inflection rule}
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\end{subfigure}
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\hfill
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\begin{subfigure}[b]{.45\textwidth}
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\begin{subfigure}[b]{.49\textwidth}
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\includegraphics[width=\textwidth]{fig5-gentle-inflection-after}
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\caption{After applying the inflection rule}
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\end{subfigure}
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@ -386,12 +417,12 @@ vertices to the next bend instead of one.
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\begin{figure}[h]
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\centering
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\begin{subfigure}[b]{.45\textwidth}
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\begin{subfigure}[b]{.49\textwidth}
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\includegraphics[width=\textwidth]{inflection-1-gentle-inflection-before}
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\caption{Before applying the inflection rule}
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\end{subfigure}
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\hfill
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\begin{subfigure}[b]{.45\textwidth}
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\begin{subfigure}[b]{.49\textwidth}
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\includegraphics[width=\textwidth]{inflection-1-gentle-inflection-after}
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\caption{After applying the inflection rule}
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\end{subfigure}
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@ -427,12 +458,12 @@ following the rules of the article.
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\begin{figure}[h]
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\centering
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\begin{subfigure}[b]{.45\textwidth}
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\begin{subfigure}[b]{.49\textwidth}
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\includegraphics[width=\textwidth]{fig6-selfcrossing-before}
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\caption{Bend's baseline (dotted) is crossing a neighboring bend}
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\end{subfigure}
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\hfill
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\begin{subfigure}[b]{.45\textwidth}
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\begin{subfigure}[b]{.49\textwidth}
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\includegraphics[width=\textwidth]{fig6-selfcrossing-after}
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\caption{Self-crossing removed following the algorithm}
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\end{subfigure}
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@ -447,12 +478,12 @@ figure~\onpage{fig:selfcrossing-1-non-neighbor}.
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\begin{figure}[h]
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\centering
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\begin{subfigure}[b]{.45\textwidth}
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\begin{subfigure}[b]{.49\textwidth}
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\includegraphics[width=\textwidth]{selfcrossing-1-before}
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\caption{Bend's baseline (dotted) is crossing a non-neighboring bend}
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\end{subfigure}
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\hfill
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\begin{subfigure}[b]{.45\textwidth}
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\begin{subfigure}[b]{.49\textwidth}
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\includegraphics[width=\textwidth]{selfcrossing-1-after}
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\caption{Self-crossing removed following the algorithm}
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\end{subfigure}
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