blob: 07760e66cfc1de3f6bd73e4ba07767722fb138f2 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
|
<!DOCTYPE html>
<html class="writer-html5" lang="en" >
<head>
<meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Set coordinate value — PROJ 9.0.0 documentation</title>
<link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
<link rel="stylesheet" href="../../_static/css/theme.css" type="text/css" />
<link rel="shortcut icon" href="../../_static/favicon.png"/>
<link rel="canonical" href="https://proj.orgoperations/conversions/set.html"/>
<!--[if lt IE 9]>
<script src="../../_static/js/html5shiv.min.js"></script>
<![endif]-->
<script data-url_root="../../" id="documentation_options" src="../../_static/documentation_options.js"></script>
<script src="../../_static/jquery.js"></script>
<script src="../../_static/underscore.js"></script>
<script src="../../_static/doctools.js"></script>
<script src="../../_static/js/theme.js"></script>
<link rel="author" title="About these documents" href="../../about.html" />
<link rel="index" title="Index" href="../../genindex.html" />
<link rel="search" title="Search" href="../../search.html" />
<link rel="next" title="Geocentric to topocentric conversion" href="topocentric.html" />
<link rel="prev" title="Push coordinate value to pipeline stack" href="push.html" />
</head>
<body class="wy-body-for-nav">
<div class="wy-grid-for-nav">
<nav data-toggle="wy-nav-shift" class="wy-nav-side">
<div class="wy-side-scroll">
<div class="wy-side-nav-search" style="background: #353130" >
<a href="../../index.html">
<img src="../../_static/logo.png" class="logo" alt="Logo"/>
</a>
<div class="version">
9.0.0
</div>
<div role="search">
<form id="rtd-search-form" class="wy-form" action="../../search.html" method="get">
<input type="text" name="q" placeholder="Search docs" />
<input type="hidden" name="check_keywords" value="yes" />
<input type="hidden" name="area" value="default" />
</form>
</div>
</div><div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="Navigation menu">
<ul class="current">
<li class="toctree-l1"><a class="reference internal" href="../../about.html">About</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../news.html">News</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../download.html">Download</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../install.html">Installation</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../usage/index.html">Using PROJ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../apps/index.html">Applications</a></li>
<li class="toctree-l1 current"><a class="reference internal" href="../index.html">Coordinate operations</a><ul class="current">
<li class="toctree-l2"><a class="reference internal" href="../projections/index.html">Projections</a></li>
<li class="toctree-l2 current"><a class="reference internal" href="index.html">Conversions</a><ul class="current">
<li class="toctree-l3"><a class="reference internal" href="axisswap.html">Axis swap</a></li>
<li class="toctree-l3"><a class="reference internal" href="cart.html">Geodetic to cartesian conversion</a></li>
<li class="toctree-l3"><a class="reference internal" href="geoc.html">Geocentric Latitude</a></li>
<li class="toctree-l3"><a class="reference internal" href="latlon.html">Lat/long (Geodetic alias)</a></li>
<li class="toctree-l3"><a class="reference internal" href="noop.html">No operation</a></li>
<li class="toctree-l3"><a class="reference internal" href="pop.html">Pop coordinate value to pipeline stack</a></li>
<li class="toctree-l3"><a class="reference internal" href="push.html">Push coordinate value to pipeline stack</a></li>
<li class="toctree-l3 current"><a class="current reference internal" href="#">Set coordinate value</a><ul>
<li class="toctree-l4"><a class="reference internal" href="#example">Example</a></li>
<li class="toctree-l4"><a class="reference internal" href="#parameters">Parameters</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="topocentric.html">Geocentric to topocentric conversion</a></li>
<li class="toctree-l3"><a class="reference internal" href="unitconvert.html">Unit conversion</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="../transformations/index.html">Transformations</a></li>
<li class="toctree-l2"><a class="reference internal" href="../pipeline.html">The pipeline operator</a></li>
<li class="toctree-l2"><a class="reference internal" href="../operations_computation.html">Computation of coordinate operations between two CRS</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../../resource_files.html">Resource files</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../geodesic.html">Geodesic calculations</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../development/index.html">Development</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../specifications/index.html">Specifications</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../community/index.html">Community</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../faq.html">FAQ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../glossary.html">Glossary</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../zreferences.html">References</a></li>
</ul>
</div>
</div>
</nav>
<section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"><nav class="wy-nav-top" aria-label="Mobile navigation menu" style="background: #353130" >
<i data-toggle="wy-nav-top" class="fa fa-bars"></i>
<a href="../../index.html">PROJ</a>
</nav>
<div class="wy-nav-content">
<div class="rst-content">
<div role="navigation" aria-label="Page navigation">
<ul class="wy-breadcrumbs">
<li><a href="../../index.html" class="icon icon-home"></a> »</li>
<li><a href="../index.html">Coordinate operations</a> »</li>
<li><a href="index.html">Conversions</a> »</li>
<li>Set coordinate value</li>
<li class="wy-breadcrumbs-aside">
<a href="https://github.com/OSGeo/PROJ/edit/8.2/docs/source/operations/conversions/set.rst" class="fa fa-github"> Edit on GitHub</a>
</li>
</ul><div class="rst-breadcrumbs-buttons" role="navigation" aria-label="Sequential page navigation">
<a href="push.html" class="btn btn-neutral float-left" title="Push coordinate value to pipeline stack" accesskey="p"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a>
<a href="topocentric.html" class="btn btn-neutral float-right" title="Geocentric to topocentric conversion" accesskey="n">Next <span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a>
</div>
<hr/>
</div>
<div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
<div itemprop="articleBody">
<section id="set-coordinate-value">
<span id="set"></span><h1>Set coordinate value<a class="headerlink" href="#set-coordinate-value" title="Permalink to this headline">¶</a></h1>
<div class="versionadded">
<p><span class="versionmodified added">New in version 7.0.0.</span></p>
</div>
<p>Set component(s) of a coordinate to a fixed value.</p>
<table class="docutils align-default">
<colgroup>
<col style="width: 27%" />
<col style="width: 73%" />
</colgroup>
<tbody>
<tr class="row-odd"><td><p><strong>Alias</strong></p></td>
<td><p>set</p></td>
</tr>
<tr class="row-even"><td><p><strong>Domain</strong></p></td>
<td><p>4D</p></td>
</tr>
<tr class="row-odd"><td><p><strong>Input type</strong></p></td>
<td><p>Any</p></td>
</tr>
<tr class="row-even"><td><p><strong>Output type</strong></p></td>
<td><p>Any</p></td>
</tr>
</tbody>
</table>
<p>This operations allows for components of coordinates to be set to a fixed value.
This may be useful in <a class="reference internal" href="../pipeline.html#pipeline"><span class="std std-ref">pipeline</span></a> when a step requires some
component, typically an elevation or a date, to be set to a fixed value.</p>
<section id="example">
<h2>Example<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h2>
<p>In the ETRS89 to Dutch RD with NAP height transformation, the used ellipsoidal
height for the Helmert transformation is not the NAP height, but the height is
set to 0 m. This is an unconventional trick to get the same results as when the
effect of the Helmert transformation is included in the horizontal NTv2 grid.
For the forward transformation from ETRS89 to RD with NAP height, we need to set
the ellipsoidal ETRS89 height for the Helmert transformation to the equivalent
of 0 m NAP. This is 43 m for the centre of the Netherlands and this value can
be used as an approximation elsewhere (the effect of this approximation is
below 1 mm for the horizontal coordinates, in an area up to hundreds of km
outside the Netherlands).</p>
<p>The <code class="docutils literal notranslate"><span class="pre">+proj=set</span> <span class="pre">+v_3=0</span></code> close to the end of the pipeline is to make it usable in
the reverse direction.</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>$ cct -t 0 -d 4 +proj=pipeline \
+step +proj=unitconvert +xy_in=deg +xy_out=rad \
+step +proj=axisswap +order=2,1 \
+step +proj=vgridshift +grids=nlgeo2018.gtx \
+step +proj=push +v_3 \
+step +proj=set +v_3=43 \
+step +proj=cart +ellps=GRS80 \
+step +proj=helmert +x=-565.7346 +y=-50.4058 +z=-465.2895 +rx=-0.395023 +ry=0.330776 +rz=-1.876073 +s=-4.07242 +convention=coordinate_frame +exact \
+step +proj=cart +inv +ellps=bessel \
+step +proj=hgridshift +inv +grids=rdcorr2018.gsb,null \
+step +proj=sterea +lat_0=52.156160556 +lon_0=5.387638889 +k=0.9999079 +x_0=155000 +y_0=463000 +ellps=bessel \
+step +proj=set +v_3=0 \
+step +proj=pop +v_3
</pre></div>
</div>
</section>
<section id="parameters">
<h2>Parameters<a class="headerlink" href="#parameters" title="Permalink to this headline">¶</a></h2>
<dl class="std option">
<dt class="sig sig-object std" id="cmdoption-arg-v_1">
<span id="cmdoption-arg-v-1"></span><span class="sig-name descname"><span class="pre">+v_1</span></span><span class="sig-prename descclassname"><span class="pre">=value</span></span><a class="headerlink" href="#cmdoption-arg-v_1" title="Permalink to this definition">¶</a></dt>
<dd><p>Set the first coordinate component to the specified value</p>
</dd></dl>
<dl class="std option">
<dt class="sig sig-object std" id="cmdoption-arg-v_2">
<span id="cmdoption-arg-v-2"></span><span class="sig-name descname"><span class="pre">+v_2</span></span><span class="sig-prename descclassname"><span class="pre">=value</span></span><a class="headerlink" href="#cmdoption-arg-v_2" title="Permalink to this definition">¶</a></dt>
<dd><p>Set the second coordinate component to the specified value</p>
</dd></dl>
<dl class="std option">
<dt class="sig sig-object std" id="cmdoption-arg-v_3">
<span id="cmdoption-arg-v-3"></span><span class="sig-name descname"><span class="pre">+v_3</span></span><span class="sig-prename descclassname"><span class="pre">=value</span></span><a class="headerlink" href="#cmdoption-arg-v_3" title="Permalink to this definition">¶</a></dt>
<dd><p>Set the third coordinate component to the specified value</p>
</dd></dl>
<dl class="std option">
<dt class="sig sig-object std" id="cmdoption-arg-v_4">
<span id="cmdoption-arg-v-4"></span><span class="sig-name descname"><span class="pre">+v_4</span></span><span class="sig-prename descclassname"><span class="pre">=value</span></span><a class="headerlink" href="#cmdoption-arg-v_4" title="Permalink to this definition">¶</a></dt>
<dd><p>Set the fourth coordinate component to the specified value</p>
</dd></dl>
</section>
</section>
</div>
</div>
<footer><div class="rst-footer-buttons" role="navigation" aria-label="Footer">
<a href="push.html" class="btn btn-neutral float-left" title="Push coordinate value to pipeline stack" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a>
<a href="topocentric.html" class="btn btn-neutral float-right" title="Geocentric to topocentric conversion" accesskey="n" rel="next">Next <span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a>
</div>
<hr/>
<div role="contentinfo">
<p>© Copyright 1983-2022.
<span class="lastupdated">Last updated on 22 Mar 2022.
</span></p>
</div>
Built with <a href="https://www.sphinx-doc.org/">Sphinx</a> using a
<a href="https://github.com/readthedocs/sphinx_rtd_theme">theme</a>
provided by <a href="https://readthedocs.org">Read the Docs</a>.
</footer>
</div>
</div>
</section>
</div>
<script>
jQuery(function () {
SphinxRtdTheme.Navigation.enable(true);
});
</script>
</body>
</html>
|
