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Motiejus Jakštys 2021-05-19 22:57:49 +03:00 committed by Motiejus Jakštys
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@ -2,25 +2,31 @@ Wang–Müller algorithm in PostGIS
--------------------------------
This is a work-in-progress implementation following "Line generalization based
on analysis of shape characteristics" by Wang and Müller, 1998 paper.
on analysis of shape characteristics" by Wang and Müller, 1998.
Structure
---------
Detailed implementation description: `mj-msc.tex`. It is describing in detail
what is implemented and what isn't, and why.
There will be 2 deliverables from this folder:
Algorithm itself: `wm.sql`. This is the main file you probably want to look at.
- `wm.sql`, the implementation.
- paper `mj-msc-full.pdf`, a MSc thesis, explaining the whole thing.
Synthetic tests are in `tests.sql`. They are exercising various pieces of the
algorithm and asserting the results are what expect them to be.
It contains a few supporting files, notably:
Tests with real rivers are in `test-rivers.sql`.
- `tests.sql` for synthetic unit tests.
- `test-rivers.sql` for tests with real rivers.
- `Makefile` to glue everything together.
- `layer2img.py` converts a PostGIS layer to an embeddable image.
- `init.sql` initializes PostGIS database for running the tests.
- `rivers.sql` is an OpenStreetMap snapshot of select rivers (`Makefile`
contains code to update them).
- ... and a few more files to build the paper.
`Makefile` glues everything together.
Running it
----------
Executing the algorithm
-----------------------
`make help` lists the most interesting commands for humans. As of writing:
```
$ make help
@ -39,7 +45,7 @@ To execute the algorithm, run:
- `make test` for tests with synthetic data.
- `make test-rivers` for tests with real rivers. You may adjust the rivers and
data source (e.g. use a different country instead of Lithuania) by changing
the `Makefile` and the test files.
the `Makefile` and the test files. Left as an exercise for the reader.
Building the paper (pdf)
------------------------
@ -50,9 +56,10 @@ $ make -j$(nproc) mj-msc-full.pdf
`mj-msc.tex` results in `mj-msc-full.pdf`, which will be at some point
published. It needs quite a few dependencies, including a functioning Docker
environment.
environment, postgresql client, geopandas, and a pretty complete LaTeX
installation.
License
-------
GPL 2.0 or later. Same as QGIS and PostGIS.
Same as QGIS and PostGIS: GPL 2.0 or later.