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‎.nojekyll‎

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‎01-geodata.html‎

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‎03-geoio.html‎

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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head>
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<meta charset="utf-8">
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<meta name="generator" content="quarto-1.5.56">
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@@ -375,7 +375,7 @@ <h2 data-number="3.1" class="anchored" data-anchor-id="geoio.jl"><span class="he
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<section id="file-formats" class="level2" data-number="3.2">
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<h2 data-number="3.2" class="anchored" data-anchor-id="file-formats"><span class="header-section-number">3.2</span> File formats</h2>
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<p>Most GIS file formats do <strong>not</strong> preserve topological information. This means that neighborhood information is lost as soon as geometries are saved to disk. To illustrate this issue, we consider a geotable over a grid:</p>
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<div id="ee11c935" class="cell" data-execution_count="2">
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<div class="sourceCode cell-code" id="cb3"><pre class="sourceCode julia code-with-copy"><code class="sourceCode julia"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="im">using</span> <span class="bu">GeoIO</span></span>
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<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a></span>
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<span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a>geotable <span class="op">=</span> GeoIO.<span class="fu">load</span>(<span class="st">"data/earth.tif"</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
@@ -384,7 +384,7 @@ <h2 data-number="3.2" class="anchored" data-anchor-id="file-formats"><span class
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<caption>11664×2 GeoTable over 108×108 TransformedGrid</caption>
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<thead>
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<tr class="header">
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<th style="text-align: center;" data-quarto-table-cell-role="th">COLOR</th>
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<th style="text-align: center;" data-quarto-table-cell-role="th">color</th>
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<th style="text-align: center;" data-quarto-table-cell-role="th">geometry</th>
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</table>
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<p>If we save the geotable to a <code>.geojson</code> file on disk, and then load it back, we observe that the <code>CartesianGrid</code> gets replaced by a <code>GeometrySet</code>:</p>
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<div id="cbac4062" class="cell" data-execution_count="3">
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<p>If we save the geotable to a <code>.geojson</code> file on disk, and then load it back, we observe that the grid gets replaced by a geometry set:</p>
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<div id="c9ca3d1b" class="cell" data-execution_count="3">
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<div class="sourceCode cell-code" id="cb4"><pre class="sourceCode julia code-with-copy"><code class="sourceCode julia"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a>fname <span class="op">=</span> <span class="fu">tempname</span>() <span class="op">*</span> <span class="st">".geojson"</span></span>
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<span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a></span>
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<span id="cb4-3"><a href="#cb4-3" aria-hidden="true" tabindex="-1"></a>GeoIO.<span class="fu">save</span>(fname, geotable)</span>
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<caption>11664×2 GeoTable over 11664 GeometrySet</caption>
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<thead>
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<tr class="header">
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<th style="text-align: center;" data-quarto-table-cell-role="th">COLOR</th>
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<th style="text-align: center;" data-quarto-table-cell-role="th">color</th>
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<th style="text-align: center;" data-quarto-table-cell-role="th">geometry</th>
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<p>Other file formats such as <code>.ply</code> and <code>.msh</code> are widely used in <a href="https://en.wikipedia.org/wiki/Computer_graphics">computer graphics</a> to save geospatial data over meshes, and preserve topological information:</p>
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<div id="8b76916b" class="cell" data-execution_count="4">
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<div id="2291b0d8" class="cell" data-execution_count="4">
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<div class="sourceCode cell-code" id="cb5"><pre class="sourceCode julia code-with-copy"><code class="sourceCode julia"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a>beethoven <span class="op">=</span> GeoIO.<span class="fu">load</span>(<span class="st">"data/beethoven.ply"</span>)</span>
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<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a></span>
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<span id="cb5-3"><a href="#cb5-3" aria-hidden="true" tabindex="-1"></a><span class="fu">viz</span>(beethoven.geometry)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
@@ -543,7 +543,7 @@ <h2 data-number="3.3" class="anchored" data-anchor-id="rationale"><span class="h
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<p>Do we gain anything by not adhering to <strong>programming interfaces</strong>?</p>
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<p>The answer is an emphatic <strong>YES</strong>! It means that we have total freedom to innovate and improve the representation of various geometries and geospatial domains with Julia’s amazing type system. To give a simple example, let’s take a look at the <code>Triangle</code> geometry:</p>
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<div id="486a2f5b" class="cell" data-execution_count="5">
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<div class="sourceCode cell-code" id="cb7"><pre class="sourceCode julia code-with-copy"><code class="sourceCode julia"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a>t <span class="op">=</span> <span class="fu">Triangle</span>((<span class="fl">0</span>, <span class="fl">0</span>), (<span class="fl">1</span>, <span class="fl">0</span>), (<span class="fl">1</span>, <span class="fl">1</span>))</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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<div class="cell-output cell-output-display" data-execution_count="6">
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<pre><code>Triangle
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<p>If we treated this geometry as a generic polygon represented by a vector of vertices in memory, like it is done in <a href="https://github.com/JuliaGeo/GeoInterface.jl">GeoInterface.jl</a> for example, we wouldn’t be able to dispatch optimized code that is only valid for a triangle:</p>
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<div class="sourceCode cell-code" id="cb9"><pre class="sourceCode julia code-with-copy"><code class="sourceCode julia"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a><span class="pp">@code_llvm</span> <span class="fu">isconvex</span>(t)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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<pre><code>; @ /home/runner/.julia/packages/Meshes/SJejL/src/predicates/isconvex.jl:57 within `isconvex`
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define i8 @julia_isconvex_4468([1 x [3 x [1 x [1 x [2 x [1 x double]]]]]]* nocapture readonly %0) #0 {
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<pre><code>; Function Signature: isconvex(Meshes.Ngon{3, Meshes.𝔼{2}, CoordRefSystems.Cartesian{CoordRefSystems.NoDatum, 2, Unitful.Quantity{Float64, Unitful.Dimensions{(Unitful.Dimension{:Length}(power=Base.Rational{Int64}(num=1, den=1)),)}(), Unitful.FreeUnits{(Unitful.Unit{:Meter, Unitful.Dimensions{(Unitful.Dimension{:Length}(power=Base.Rational{Int64}(num=1, den=1)),)}()}(tens=0, power=Base.Rational{Int64}(num=1, den=1)),), Unitful.Dimensions{(Unitful.Dimension{:Length}(power=Base.Rational{Int64}(num=1, den=1)),)}(), nothing}}}})
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; @ /home/runner/.julia/packages/Meshes/lAdY6/src/predicates/isconvex.jl:57 within `isconvex`
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define i8 @julia_isconvex_27603(ptr nocapture readonly %0) #0 {
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ret i8 1
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}</code></pre>

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