commit 6d1dd019d73a21aa18218a40c29b4e8b1da694f4 (tree)
parent 94f0e54ea6f9f8fcc1fb014f2f492a099ef110ba
Author: Motiejus Jakštys <desired.mta@gmail.com>
Date: Tue, 26 May 2020 13:56:26 +0300
example bends generalized
Diffstat:
4 files changed, 38 insertions(+), 19 deletions(-)
diff --git a/II/Referatas/Makefile b/II/Referatas/Makefile
@@ -4,7 +4,7 @@ GEN = $(addsuffix .pdf, \
$(addprefix zeimena-visvalingam-,$(TOLERANCES)))
mj-referatas.pdf: mj-referatas.tex version.tex bib.bib zeimena-pretty.pdf \
- sinewave-douglas-100.pdf $(GEN)
+ sinewave.pdf sinewave-douglas-5.pdf $(GEN)
latexmk -g -pdf $<
define algo2img
@@ -16,13 +16,16 @@ $(1)-$(2)-$(3).pdf: layer2img.py db/.faux_$(1)-$(2)-$(3)
./layer2img.py --table=$(1)_$(2)_$(3) --size=52x74 --outfile $(1)-$(2)-$(3).pdf
endef
-$(eval $(call algo2img,sinewave,douglas,100))
+$(eval $(call algo2img,sinewave,douglas,5))
$(foreach t,$(TOLERANCES),$(eval $(call algo2img,zeimena,douglas,$(t))))
$(foreach t,$(TOLERANCES),$(eval $(call algo2img,zeimena,visvalingam,$(t))))
sinewave.gpkg: sinewave.py
./sinewave.py
+sinewave.pdf: sinewave.gpkg
+ ./layer2img.py --size=52x15 --infile=$< --outfile=$@
+
db/.faux_ready: zeimena.gpkg sinewave.gpkg managedb
-./managedb stop; rm -fr db
./managedb init
diff --git a/II/Referatas/bib.bib b/II/Referatas/bib.bib
@@ -45,6 +45,14 @@
publisher={John Wiley and Sons}
}
+@article{miuller1995generalization,
+ title={Generalization-state of the art and issues},
+ author={Miuller, JC and Weibel, R and Lagrange, J and {\"E}alge, F},
+ journal={GIS and Generalisation: Methodology and Practice},
+ pages={3--17},
+ year={1995}
+}
+
@inproceedings{mcmaster1992generalization,
title={Generalization in digital cartography},
author={McMaster, Robert Brainerd and Shea, K Stuart},
diff --git a/II/Referatas/mj-referatas.tex b/II/Referatas/mj-referatas.tex
@@ -52,6 +52,16 @@ connect rivers first to a single polylines:
ideal hypothesis: mueller algorithm + topology may fully realize cartographic generalization tasks.
what scales and what distances?
+
+= Intro: Aktualumas
+FOSS nėra realizuotas tinkamas kartografinio realizavimo algoritmas (2–3 sakiniai). Kad kartografai turėtų
+įrankį upių generalizavimui.
+
+Bazė: imame tai, ką dabar turi kartografai įrankių paletėj.
+
+Imti mažus upės vingius. Paimti mažas atkarpėles ir palyginti su originalia.
+Todėl, kad nėra kilpų.
+
\fi
\author{Motiejus Jakštys}
@@ -203,11 +213,11 @@ retained.
To sum up, both {\VW} and {\DP} simplify the lines, but their cartographic
output poorly represents lines and bends. Where to look for better output?
-\section{Suggested alternative}
-\label{sec:suggested_alternative}
+\subsection{Combining bends}
-{\WM} observed how professional cartographers are simplifying rivers and encoded it
-to an algorithm which can be implemented by a computer.
+Consecutive small bends should be combined into larger bends, and that is one
+of the least developed aspects of automatic line generalization, according to
+\cite{miuller1995generalization}. {\WM} encoded this process to an algorithm.
Imagine there are two small bends close to each other, similar to
figure~\ref{pic:example-bend} on page~\pageref{pic:example-bend}, and one needs
@@ -216,22 +226,20 @@ straight line, but too small to retain both and retain their complexity.
\begin{figure}[h]
\centering
- \begin{tikzpicture}[xscale=.5]
- \draw (-4,-1) -- (-1, -1);
- \draw (-1,-1) cos (0,0) sin (1,1) cos (2,0) sin (3,-1) cos (4,0) sin (5,1) cos(6,0) sin (7,-1);
- \draw (7,-1) -- (10, -1);
- \end{tikzpicture}
+ \includegraphics[width=52mm]{sinewave}
\caption{Example river bend that should be generalized}
- \label{pic:example-bend}
+ \label{pic:sinewave}
\end{figure}
-We would imagine
+When one applies {\DP} to figure~\ref{pic:sinewave}, either both bends remain,
+or become a straight line.
-\begin{itemize}
- \item Describe algorithm by {\WM}.
- \item Explain how outputs will differ.
- \item Explain implementation plan?
-\end{itemize}
+\begin{figure}[h]
+ \centering
+ \includegraphics[width=52mm]{sinewave-douglas-5}
+ \caption{Example bend, generalized}
+ \label{pic:sinewave-douglas-5}
+\end{figure}
\section{Related Work and future suggestions}
\label{sec:related_work}
diff --git a/II/Referatas/sinewave.py b/II/Referatas/sinewave.py
@@ -6,7 +6,7 @@ import geopandas as gpd
from shapely.geometry import LineString, MultiLineString
INTERVAL = 0.1
-TAIL_LEN = 4
+TAIL_LEN = 10
SINE_LEN = 7
TAILS = np.zeros(int(TAIL_LEN / INTERVAL))
