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ogr_geo_utils.h
1 /******************************************************************************
2 * $Id$
3 *
4 * Project: X-Plane aeronautical data reader
5 * Purpose: Definition of geo-computation functions
6 * Author: Even Rouault, even dot rouault at mines dash paris dot org
7 *
8 ******************************************************************************
9 * Copyright (c) 2008, Even Rouault <even dot rouault at mines-paris dot org>
10 *
11 * Permission is hereby granted, free of charge, to any person obtaining a
12 * copy of this software and associated documentation files (the "Software"),
13 * to deal in the Software without restriction, including without limitation
14 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
15 * and/or sell copies of the Software, and to permit persons to whom the
16 * Software is furnished to do so, subject to the following conditions:
17 *
18 * The above copyright notice and this permission notice shall be included
19 * in all copies or substantial portions of the Software.
20 *
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
22 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
24 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
26 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
27 * DEALINGS IN THE SOFTWARE.
28 ****************************************************************************/
29
30 #ifndef OGR_GEO_UTILS_H_INCLUDED
31 #define OGR_GEO_UTILS_H_INCLUDED
32
42 double OGR_GreatCircle_Distance(double dfLatA_deg, double dfLonA_deg,
43 double dfLatB_deg, double dfLonB_deg);
44
45 double OGR_GreatCircle_InitialHeading(double dfLatA_deg, double dfLonA_deg,
46 double dfLatB_deg, double dfLonB_deg);
47
48 /* such as ExtendPosition(A, Distance(A,B), InitialHeading(A,B)) ~= B */
49 int OGR_GreatCircle_ExtendPosition(double dfLatA_deg, double dfLonA_deg,
50 double dfDistance, double dfHeadingInA,
51 double* pdfLatB_deg, double* pdfLonB_deg);
52
53 #endif /* ndef OGR_GEO_UTILS_H_INCLUDED */

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