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<!doctype html>
<html>
<head>
<meta charset="utf-8">
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<title>Shingle 1.0: Generation of boundary representation from arbitrary geophysical fields</title>
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<body>
<div class="wrapper">
<p><img src="./data/shingle.png?raw=true" alt="Shingle" title="Shingle"></p>
<div>
<h1>
<a name="shingle" class="anchor" href="#shingle"><span class="octicon octicon-link"></span></a>Shingle</h1>
<p>Generation of boundary representation from arbitrary geophysical fields.</p>
<p>For further information and updates, please contact the author Dr Adam S. Candy at <a href="mailto:[email protected]">[email protected]</a>.</p>
<p class="view">
View the project on GitHub:
<a href="https://github.com/adamcandy/Shingle">adamcandy/Shingle</a>.</p>
<div class=bar>
<ul>
<li><a href="https://github.com/adamcandy/Shingle/zipball/master">Download <strong>ZIP File</strong></a></li>
<li><a href="https://github.com/adamcandy/Shingle/tarball/master">Download <strong>TAR Ball</strong></a></li>
<li><a href="https://github.com/adamcandy/Shingle">View On <strong>GitHub</strong></a></li>
</ul>
</div>
<h2>
<a name="build-status" class="anchor" href="#build-status"><span class="octicon octicon-link"></span></a>Build status</h2>
<p><a href="http://travis-ci.org/adamcandy/Shingle"><img src="https://secure.travis-ci.org/adamcandy/Shingle.png" alt="Build Status"></a></p>
<div>
<h2>
<a name="examples" class="anchor" href="#example"></a>Example geophysical domains</h2>
<p>
A selection of geophysical domains where Shingle has been applied to generate the boundary representation.
This description is then meshed using <a href="http://geuz.org/gmsh">Gmsh</a>.
</p>
<p><img src="./data/shingleexamples.jpg?raw=true" alt="Shingle" title="Shingle"></p>
</div>
<h2>
<a name="outline" class="anchor" href="#outline"><span class="octicon octicon-link"></span></a>Outline</h2>
<p>A new meshing approach for realistic domains.</p>
<p>This code generates boundary representations with elemernt identifications from arbitrary geophysical fields. It was originally used mask to generate a boundary along the coastlines and grounding line* (which is not positioned at a constant depth). The code is easily applied to boundaries along depth contours and to work with other NetCDF sources.</p>
<p>The new approach uses contouring routines (as opposed to the GSHHS Gmsh plugin, or a GMT approach). It would be useful to test this new code on a wide range of regions - particularly to check the contouring routines are behaving satisfactorily. It works very well in the Antarctic region (including the region inside ice shelf cavities). </p>
<p>The dependencies are all Python modules (e.g. GMT is not required).</p>
<ul>
<li>which involves a neat trick with modulo arithmetic to keep calculation time down significantly.</li>
</ul><h2>
<a name="supported-features" class="anchor" href="#supported-features"><span class="octicon octicon-link"></span></a>Supported features</h2>
<ul>
<li>Generate boundary representation from raw raster input (e.g. a NetCDF data file),</li>
<li>Regions defined by arbitrary functions of longitude and latitude (given on the command line),</li>
<li>Simpler definition of regions by boxes (such as 'longmin:longmax,latmin:longmax'),</li>
<li>Define included paths by Gmsh ID number (useful to include or exclude specific islands/land masses),</li>
<li>Deals with multiple open boundaries,</li>
<li>Islands and boundaries split by the global boundary are treated,</li>
<li>Automatically closes boundaries with parallels and meridians (with a prescribed length step),</li>
<li>Applies different boundary IDs on open and closed boundaries,</li>
<li>Exclude smaller islands - restricted by a given minimum area,</li>
<li>Option to extend domain in latitude on open boundaries (e.g. for sponge regions, or large open regions in the open ocean),</li>
<li>Command line used is saved in the Gmsh .geo file for reference,</li>
<li>Projection type (e.g. options to generate a mesh to UTM coordinates, </li>
<li>Option to generate the ACC average track line (and then to refine the mesh to this).</li>
<li>Ice shelf inclusion options</li>
</ul><h2>
<a name="development-version" class="anchor" href="#development-version"><span class="octicon octicon-link"></span></a>Development version</h2>
<p>A development version of the code also has:</p>
<ul>
<li>Caching of contours (which can save a lot of processing time)</li>
<li>Graphical output of contouring stage, to aid in contour selection</li>
</ul><h2>
<a name="other-updates" class="anchor" href="#other-updates"><span class="octicon octicon-link"></span></a>Other updates</h2>
<ul>
<li>Consistent use of dx_default,</li>
<li>The Antarctica main example contour can now be meshed (uses dx=10 in the parallel creation now),</li>
<li>Renamed the variables associated with the inclusion of the ice shelf ocean cavities to be more intuitive.</li>
</ul><h2>
<a name="test-suite" class="anchor" href="#test-suite"><span class="octicon octicon-link"></span></a>Test suite</h2>
<p>Currently there are six tests in the test suite:</p>
<ul>
<li>amundsen_sea</li>
<li>antarctica_all</li>
<li>antarctica_main_landmass</li>
<li>antarctica_main_landmass_30s</li>
<li>filchner-ronne</li>
<li>filchner-ronne_iceshelf</li>
</ul><h2>
<a name="datasets" class="anchor" href="#datasets"><span class="octicon octicon-link"></span></a>Datasets</h2>
<p>The above tests use the RTopo dataset, described in detail at: <a href="http://doi.pangaea.de/10.1594/PANGAEA.741917">http://doi.pangaea.de/10.1594/PANGAEA.741917</a>.</p>
<p>Timmermann, R et al. (2010): Antarctic ice sheet topography, cavity geometry, and global bathymetry (RTopo 1.0.5-beta). doi:10.1594/PANGAEA.741917,
Supplement to: Timmermann, Ralph; Le Brocq, Anne M; Deen, Tara J; Domack, Eugene W; Dutrieux, Pierre; Galton-Fenzi, Ben; Hellmer, Hartmut H; Humbert, Angelika; Jansen, Daniela; Jenkins, Adrian; Lambrecht, Astrid; Makinson, Keith; Niederjasper, Fred; Nitsche, Frank-Oliver; Nøst, Ole Anders; Smedsrud, Lars Henrik; Smith, Walter (2010): A consistent dataset of Antarctic ice sheet topography, cavity geometry, and global bathymetry. Earth System Science Data, 2(2), 261-273, doi:10.5194/essd-2-261-2010</p>
</div>
<div>
<p>This project is maintained by <a href="https://github.com/adamcandy">Dr Adam S. Candy</a>.</p>
</div>
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