海拔高度图*.dem文件的读取—vtkDEMReader

时间：2023-03-08 22:15:15
海拔高度图*.dem文件的读取—vtkDEMReader

vtkDEMReader reads digital elevation files and creates image data. Digital elevation files are produced by the US Geological Survey. A complete description of the DEM file is located at the USGS site. The reader reads the entire dem file and create a vtkImageData that contains a single scalar component that is the elevation in meters. The spacing is also expressed in meters. A number of get methods provide access to fields on the header.

vtkDEMReader 用于读入数字海拔图像文件，并创建图像数据（image data）。数字海拔图形文件，是由US Geological Survey美国的创建。DEM文件的完整描述参见 USGS site。vtkDEMReader类读取完整的dem文件，并创建vtkImageData类对象，在该类对象中包含有一个简单的scalar标量值，该值是以米为单位的海拔高度。空间间隔或间距（spacing）也是以米为单位。在头文件中，有许多get方法可以访问这些参数。

海拔高度图*.dem文件的读取—vtkDEMReader

 #ifndef INITIAL_OPENGL

 #define INITIAL_OPENGL

 #include <vtkAutoInit.h>

 VTK_MODULE_INIT(vtkRenderingOpenGL)

 VTK_MODULE_INIT(vtkInteractionStyle)

 #endif

 #include <iostream>

 using namespace std;

 #include "vtkSmartPointer.h"

 #include <vtkSmartPointer.h>

 #include <vtkImageActor.h>

 #include <vtkImageMapToColors.h>

 #include <vtkLookupTable.h>

 #include <vtkDEMReader.h>

 #include <vtkImageData.h>

 #include <vtkImageMapper3D.h>

 #include <vtkRenderWindow.h>

 #include <vtkRenderWindowInteractor.h>

 #include <vtkInteractorStyleImage.h>

 #include <vtkRenderer.h>

 int main()

 {

     // Read the file

       vtkSmartPointer<vtkDEMReader> reader = vtkSmartPointer<vtkDEMReader>::New();

       reader->SetFileName("D:/Qt/VTK6.3.0/vtkExampleModelFiles/SainteHelens.dem");

       reader->Update();

       vtkSmartPointer<vtkLookupTable> lut = vtkSmartPointer<vtkLookupTable>::New();

       lut->SetHueRange(0.6, );

       lut->SetSaturationRange(1.0, );

       lut->SetValueRange(0.5, 1.0);

       lut->SetTableRange(reader->GetOutput()->GetScalarRange());

       // Visualize

       vtkSmartPointer<vtkImageMapToColors> mapColors = vtkSmartPointer<vtkImageMapToColors>::New();

       mapColors->SetLookupTable(lut);

       mapColors->SetInputConnection(reader->GetOutputPort());

       // Create an actor

       vtkSmartPointer<vtkImageActor> actor =vtkSmartPointer<vtkImageActor>::New();

       actor->GetMapper()->SetInputConnection(mapColors->GetOutputPort());

       // Setup renderer

       vtkSmartPointer<vtkRenderer> renderer =vtkSmartPointer<vtkRenderer>::New();

       renderer->AddActor(actor);

       renderer->ResetCamera();

       // Setup render window

       vtkSmartPointer<vtkRenderWindow> renderWindow =vtkSmartPointer<vtkRenderWindow>::New();

       renderWindow->AddRenderer(renderer);

       // Setup render window interactor

       vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =vtkSmartPointer<vtkRenderWindowInteractor>::New();

       vtkSmartPointer<vtkInteractorStyleImage> style =vtkSmartPointer<vtkInteractorStyleImage>::New();

       renderWindowInteractor->SetInteractorStyle(style);

       // Render and start interaction

       renderWindowInteractor->SetRenderWindow(renderWindow);

       renderWindowInteractor->Initialize();

       renderWindowInteractor->Start();

     return ;

 }

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