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
|
/*=========================================================================
Program: ORFEO Toolbox
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Centre National d'Etudes Spatiales. All rights reserved.
See OTBCopyright.txt for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
// Software Guide : BeginCommandLineArgs
// ${OTB_DATA_ROOT}/Input/srtm_directory ${OTB_DATA_ROOT}/Input/DEM/egm96.grd
// 40 8.434583 44.647083 383.580313671 0.001
// Software Guide : EndCommandLineArgs
// Software Guide : BeginLatex
//
// OTB relies on OSSIM for elevation handling. Since release 3.16, there is a
// single configuration class \doxygen{otb}{DEMHandler} to manage elevation (in
// image projections or localization functions for example). This configuration
// is managed by the a proper instantiation and parameters setting of this
// class. These instantiations must be done before any call to geometric
// filters or functionalities. Ossim internal accesses to elevation are also
// configured by this class and this will ensure consistency throughout the
// library.
//
// Software Guide : EndLatex
#include "otbDEMHandler.h"
int main(int argc, char * argv[])
{
if(argc!=8)
{
std::cerr<<"Usage: "<<argv[0]<<" demdir[path|no] geoid[path|no] defaultHeight longitude latitude targetValue tolerance"<<std::endl;
return EXIT_FAILURE;
}
std::string demdir = argv[1];
std::string geoid = argv[2];
double defaultHeight = atof(argv[3]);
double longitude = atof(argv[4]);
double latitude = atof(argv[5]);
double target = atof(argv[6]);
double tolerance = atof(argv[7]);
// Software Guide : BeginLatex
//
// This class is a singleton, the New() method is deprecated and will be removed
// in future release. We need to use the \code{Instance()} method instead.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
otb::DEMHandler::Pointer demHandler = otb::DEMHandler::Instance();
// Software Guide : EndCodeSnippet
bool fail = false;
// Software Guide : BeginLatex
//
// It allows configuring a directory containing DEM tiles (DTED or SRTM
// supported) using the \code{OpenDEMDirectory()} method. The \code{OpenGeoidFile()} method
// allows inputting a geoid file as well. Last, a default height above ellipsoid
// can be set using the \code{SetDefaultHeightAboveEllipsoid()} method.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
demHandler->SetDefaultHeightAboveEllipsoid(defaultHeight);
if(!demHandler->IsValidDEMDirectory(demdir.c_str()))
{
std::cerr<<"IsValidDEMDirectory("<<demdir<<") = false"<<std::endl;
fail = true;
}
demHandler->OpenDEMDirectory(demdir);
demHandler->OpenGeoidFile(geoid);
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// We can now retrieve height above ellipsoid or height above Mean Sea Level
// (MSL) using the methods \code{GetHeightAboveEllipsoid()} and
// \code{GetHeightAboveMSL()}. Outputs of these methods depend on the
// configuration of the class \doxygen{otb}{DEMHandler} and the different
// cases are:
//
// For \code{GetHeightAboveEllipsoid()}:
//
// \begin{itemize}
// \item DEM and geoid both available: $dem\_value + geoid\_offset$
// \item No DEM but geoid available: geoid\_offset
// \item DEM available, but no geoid: dem\_value
// \item No DEM and no geoid available: default height above ellipsoid
// \end{itemize}
//
// For \code{GetHeightAboveMSL()}:
//
// \begin{itemize}
// \item DEM and geoid both available: srtm\_value
// \item No DEM but geoid available: $0$
// \item DEM available, but no geoid: srtm\_value
// \item No DEM and no geoid available: $0$
// \end{itemize}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
otb::DEMHandler::PointType point;
point[0] = longitude;
point[1] = latitude;
double height = -32768;
height = demHandler->GetHeightAboveMSL(point);
std::cout<<"height above MSL ("<<longitude<<","
<<latitude<<") = "<<height<<" meters"<<std::endl;
height = demHandler->GetHeightAboveEllipsoid(point);
std::cout<<"height above ellipsoid ("<<longitude
<<", "<<latitude<<") = "<<height<<" meters"<<std::endl;
// Software Guide : EndCodeSnippet
//
// Software Guide : BeginLatex
//
// Note that OSSIM internal calls for sensor
// modelling use the height above ellipsoid, and follow the same logic as the
// \code{GetHeightAboveEllipsoid()} method.
//
//Software Guide : EndLatex
// Check for Nan
if(vnl_math_isnan(height))
{
std::cerr<<"Computed value is NaN"<<std::endl;
fail = true;
}
double error = vcl_abs(height-target);
if(error>tolerance)
{
std::cerr<<"Target value is "<<target<<" meters, computed value is "<<height<<" meters. error ("<<error<<" meters) > tolerance ("<<tolerance<<" meters)"<<std::endl;
fail = true;
}
if(fail)
{
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
|
