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4	<head>
5	<title>inquad.pro (SAXO Documentation Assistant)</title>
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50	<font size=-1><i>SAXO Documentation Assistant</i>: <a href="./../home.html">Overview</a></font></td>
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55
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57	<h1><font size="-2">Interpolation/</font></h1>
58	<h2>inquad.pro</h2>
59
60	<dl>
61	</dl>
62
63
64	to find if an (x,y) point is in a quadrilateral (x1,x2,x3,x4)
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66
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68
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70	<a name="#_inquad"></a>
71
72	<h2>inquad <font size="-1" color="#006633">
73	Grid
74	</font></h2>
75
76	<p><font face="Courier"><i>result = </i>inquad(<i><a href="#_inquad_keyword_x">x</a>, <a href="#_inquad_keyword_y">y</a>, <a href="#_inquad_keyword_x1">x1</a>, <a href="#_inquad_keyword_y1">y1</a>, <a href="#_inquad_keyword_x2">x2</a>, <a href="#_inquad_keyword_y2">y2</a>, <a href="#_inquad_keyword_x3">x3</a>, <a href="#_inquad_keyword_y3">y3</a>, <a href="#_inquad_keyword_x4">x4</a>, <a href="#_inquad_keyword_y4">y4</a></i>, <a href="#_inquad_keyword_ONSPHERE">ONSPHERE</a>=<i>ONSPHERE</i>, <a href="#_inquad_keyword_DOUBLE">DOUBLE</a>=<i>DOUBLE</i>, <a href="#_inquad_keyword_ZOOMRADIUS">ZOOMRADIUS</a>=<i>ZOOMRADIUS</i>, <a href="#_inquad_keyword_NOPRINT">NOPRINT</a>=<i>NOPRINT</i>, <a href="#_inquad_keyword_NEWCOORD">NEWCOORD</a>=<i>NEWCOORD</i>)</font></p>
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80	<h3>Return value</h3>
81	a n element vector. Where n is the number of elements of
82	x. res[i]=j means that the point number i is located in the
83	quadrilateral number j with (0 <= j <= n_elements(x0)-1)
84
85
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87	<h3>Parameters</h3>
88
89
90	<a name="#_inquad_keyword_x"></a>
91	<h4>x
92	<font size="-1" color="#006633">in</font>
93
94
95	<font size="-1" color="#006633">required</font>
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100	</h4>
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105	<a name="#_inquad_keyword_y"></a>
106	<h4>y
107	<font size="-1" color="#006633">in</font>
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109
110	<font size="-1" color="#006633">required</font>
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114
115	</h4>
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117
118	the coordinates of the point we want to know where it is.
119	Must be a scalar if /ONSPHERE activated else can be scalar or array.
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121
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123	<a name="#_inquad_keyword_x1"></a>
124	<h4>x1
125	<font size="-1" color="#006633">in</font>
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127
128	<font size="-1" color="#006633">required</font>
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133	</h4>
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138	<a name="#_inquad_keyword_y1"></a>
139	<h4>y1
140	<font size="-1" color="#006633">in</font>
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142
143	<font size="-1" color="#006633">required</font>
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148	</h4>
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153	<a name="#_inquad_keyword_x2"></a>
154	<h4>x2
155	<font size="-1" color="#006633">in</font>
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158	<font size="-1" color="#006633">required</font>
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163	</h4>
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168	<a name="#_inquad_keyword_y2"></a>
169	<h4>y2
170	<font size="-1" color="#006633">in</font>
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173	<font size="-1" color="#006633">required</font>
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178	</h4>
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183	<a name="#_inquad_keyword_x3"></a>
184	<h4>x3
185	<font size="-1" color="#006633">in</font>
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188	<font size="-1" color="#006633">required</font>
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193	</h4>
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198	<a name="#_inquad_keyword_y3"></a>
199	<h4>y3
200	<font size="-1" color="#006633">in</font>
201
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203	<font size="-1" color="#006633">required</font>
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208	</h4>
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213	<a name="#_inquad_keyword_x4"></a>
214	<h4>x4
215	<font size="-1" color="#006633">in</font>
216
217
218	<font size="-1" color="#006633">required</font>
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223	</h4>
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228	<a name="#_inquad_keyword_y4"></a>
229	<h4>y4
230	<font size="-1" color="#006633">in</font>
231
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233	<font size="-1" color="#006633">required</font>
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238	</h4>
239
240
241	the coordinates of the quadrilateral given in the CLOCKWISE order.
242	Scalar or array.
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244
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246
247
248	<h3>Keywords</h3>
249
250
251	<a name="#_inquad_keyword_ONSPHERE"></a>
252	<h4>ONSPHERE
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261	</h4>
262
263
264	to specify that the quadrilateral are on a sphere and
265	that their coordinates are longitude-latitude coordinates. In this
266	case, est-west periodicity, poles singularity and other pbs
267	related to longitude-latitude coordinates are managed
268	automatically.
269
270
271	<a name="#_inquad_keyword_DOUBLE"></a>
272	<h4>DOUBLE
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281	</h4>
282
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284	use double precision to perform the computation
285
286
287	<a name="#_inquad_keyword_ZOOMRADIUS"></a>
288	<h4>ZOOMRADIUS
289
290
291
292
293
294
295	<font size="-1" color="#006633">default:</font> <font size="-1" color="#006633"><i>4</i></font>
296
297	</h4>
298
299
300	the zoom (circle centered on the (x,y) with a radius of
301	zoomradius degree where we look for the the quadrilateral which
302	contains the (x,y) point) used for the satellite projection
303	when /ONSPHERE is activated.
304	4 seems to be the minimum which can be used.
305	Can be increase if the cell size is larger than 5 degrees.
306
307
308	<a name="#_inquad_keyword_NOPRINT"></a>
309	<h4>NOPRINT
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316
317
318	</h4>
319
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321	to suppress the print messages.
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323
324	<a name="#_inquad_keyword_NEWCOORD"></a>
325	<h4>NEWCOORD
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334	</h4>
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341	<h3>Examples</h3>
342
343	IDL> x = 1.*[1, 2, 6, 7, 3]
344	IDL> y = 1.*[1, 3, 3, 4, 7]
345	IDL> x1 = 1.*[0,4,2]
346	IDL> y1 = 1.*[1,4,8]
347	IDL> x2 = 1.*[1,6,4]
348	IDL> y2 = 1.*[5,6,8]
349	IDL> x3 = 1.*[3,8,4]
350	IDL> y3 = 1.*[4,4,6]
351	IDL> x4 = 1.*[2,6,2]
352	IDL> y4 = 1.*[0,2,6]
353	IDL> splot, [0,10], [0,10], xstyle = 1, ystyle = 1,/nodata
354	IDL> for i=0,2 do oplot, [x4[i],x1[i],x2[i],x3[i],x4[i]],[y4[i],y1[i],y2[i],y3[i],y4[i]]
355	IDL> oplot, x, y, color = 20, psym = 1, thick = 2
356	IDL> print, inquad(x, y, x1, y1, x2, y2, x3, y3, x4, y4)
357
358	On a sphere see clickincell.pro...
359
360	<h3>Version history</h3>
361
362	<h4>Version</h4> $Id: inquad.pro 163 2006-08-29 12:59:46Z navarro $
363
364	<h4>History</h4>
365	Sebastien Masson (smasson@lodyc.jussieu.fr)
366	August 2003
367	Based on Convert_clic_ij.pro written by Gurvan Madec
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369
370
371	<h3>Known issues</h3>
372
373
374
375	<h4>Restrictions</h4>
376	I think degenerated quadrilateral (e.g. flat of twisted) is not work.
377	This has to be tested.
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388	<font size="-3"><p> </p></font>
389	<hr size="1" color="#CCCCCC"/>
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394	<p><font color="gray" size="-3">  Produced by IDLdoc 2.0.</font></p>
395
396	</body>
397	</html>

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