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
|
/*
* Copyright (C) 2005-2022 Centre National d'Etudes Spatiales (CNES)
*
* This file is part of Orfeo Toolbox
*
* https://www.orfeo-toolbox.org/
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// Let's assume that you have a KML file (hence in geographical coordinates)
// that you would like to superpose to some image with a specific map projection.
// Of course, you could use the handy ogr2ogr tool to do that, but it won't
// integrate so seamlessly into your OTB application.
//
// You can also suppose that the image on which you want to superpose
// the data is not in a specific map projection but a raw image from a
// particular sensor. Thanks to OTB, the same code below will be able
// to do the appropriate conversion.
//
// This example demonstrates the use of the
// \doxygen{otb}{VectorDataProjectionFilter}.
#include "otbVectorDataProjectionFilter.h"
#include "otbVectorData.h"
#include "otbVectorDataFileReader.h"
#include "otbVectorDataFileWriter.h"
#include "otbImage.h"
#include "otbImageFileReader.h"
int main(int argc, char* argv[])
{
if (argc < 4)
{
std::cout << argv[0] << " <input vector filename> <input image name> <output vector filename> " << std::endl;
return EXIT_FAILURE;
}
// Declare the vector data type that you would like to use in your
// application.
using InputVectorDataType = otb::VectorData<double>;
using OutputVectorDataType = otb::VectorData<double>;
// Declare and instantiate the vector data reader:
// \doxygen{otb}{VectorDataFileReader}. The call to the
// \code{UpdateOutputInformation()} method fill up the header information.
using VectorDataFileReaderType = otb::VectorDataFileReader<InputVectorDataType>;
VectorDataFileReaderType::Pointer reader = VectorDataFileReaderType::New();
reader->SetFileName(argv[1]);
reader->UpdateOutputInformation();
// We need the image only to retrieve its projection information,
// i.e. map projection or sensor model parameters. Hence, the image
// pixels won't be read, only the header information using the
// \code{UpdateOutputInformation()} method.
using ImageType = otb::Image<unsigned short int, 2>;
using ImageReaderType = otb::ImageFileReader<ImageType>;
ImageReaderType::Pointer imageReader = ImageReaderType::New();
imageReader->SetFileName(argv[2]);
imageReader->UpdateOutputInformation();
// The \doxygen{otb}{VectorDataProjectionFilter} will do the work of
// converting the vector data coordinates. It is usually a good idea
// to use it when you design applications reading or saving vector
// data.
using VectorDataFilterType = otb::VectorDataProjectionFilter<InputVectorDataType, OutputVectorDataType>;
VectorDataFilterType::Pointer vectorDataProjection = VectorDataFilterType::New();
// Information concerning the original projection of the vector data
// will be automatically retrieved from the metadata. Nothing else
// is needed from you:
vectorDataProjection->SetInput(reader->GetOutput());
// Information about the target projection is retrieved directly from
// the image:
vectorDataProjection->SetOutputImageMetadata(&imageReader->GetOutput()->GetImageMetadata());
vectorDataProjection->SetOutputOrigin(imageReader->GetOutput()->GetOrigin());
vectorDataProjection->SetOutputSpacing(imageReader->GetOutput()->GetSignedSpacing());
vectorDataProjection->SetOutputProjectionRef(imageReader->GetOutput()->GetProjectionRef());
// Finally, the result is saved into a new vector file.
using VectorDataFileWriterType = otb::VectorDataFileWriter<OutputVectorDataType>;
VectorDataFileWriterType::Pointer writer = VectorDataFileWriterType::New();
writer->SetFileName(argv[3]);
writer->SetInput(vectorDataProjection->GetOutput());
writer->Update();
// It is worth noting that none of this code is specific to the
// vector data format. Whether you pass a shapefile, or a KML file,
// the correct driver will be automatically instantiated.
return EXIT_SUCCESS;
}
|
