C++、GDAL创建shapefile,并向矢量文件中添加网格

//总体来说这个过程就是构建数据源->构建层->构建要素->构建形状->关闭数据源。//要包含的GDAL头文件#include <gdal_priv.h>#include <ogrsf_frmts.h>#include <iostream>using namespace std;#pragma comment(lib,"gdal_i.lib")bool Creatshape(const char* pszFileName ,int line,int row);#include <tchar.h>  //_TCHAR* 类型在该头文件里int _tmain(int argc, _TCHAR* argv[]){const char *pszFileName="C:\\Users\\Public\\Pictures\\Sample Pictures\\srtm_51_03.tif";Creatshape(pszFileName,7,9);system("pause");return 0;}/************************************************************************//*创建过程：构建数据源->构建层->构建要素->构建形状->关闭数据源/* 参数pszFileName 为输入的文件名参数linenum为划分的行数参数rows为划分的列数*//************************************************************************/bool Creatshape(const char* pszFileName ,int linenum,int rows){//获取影像信息GDALDataset *poDataSet;GDALAllRegister();  CPLSetConfigOption("GDAL_FILENAME_IS_UTF8","NO");poDataSet=(GDALDataset*)GDALOpen(pszFileName,GA_ReadOnly); //打开数据集 if (poDataSet==NULL){"Failed to open this dataset!"; //代开失败的话则给出提示并退出exit(1);}double Trans[6];//坐标转换参数数组,作为GetGeoTransform()函数的参数int width,height; //影像的像行列数;width=poDataSet->GetRasterXSize(); //获取影像列数，为后续划分网格做准备height=poDataSet->GetRasterYSize();//获取影像行数，为后续划分网格做准备poDataSet->GetGeoTransform(Trans);for (int i=0;i<6;i++){cout<<Trans[i]<<endl;  //循环输出仿射变换参数;}//注册shape文件驱动const char* pszDriverName="ESRI Shapefile";OGRSFDriver *poDriver;OGRRegisterAll();poDriver=OGRSFDriverRegistrar::GetRegistrar()->GetDriverByName(pszDriverName);if (poDriver==NULL){printf("%s driver is not available!",pszDriverName);exit(1);}//创建shape文件;OGRDataSource *poDS;//创建一个叫myshapefile的目录，存放生成的文件;//如果名字有.shp后缀，则直接在当前目录下生成文件;poDS=poDriver->CreateDataSource("myshapefile.shp",NULL); if (poDS==NULL){printf("Create my shape file failed!");exit(1);}//创建输出图层;OGRLayer *poLayer;;const char *prj=poDataSet->GetProjectionRef(); //获取栅格影像的空间参考信息cout<<"栅格数据空间参考信息为:\n"<<prj<<endl<<endl;OGRSpatialReference oSRS;  oSRS.SetFromUserInput(prj);  //将获得的空间参考信息字符串做为文本一次性赋给矢量数据的OGRSpatialReference对象;poLayer=poDS->CreateLayer(pszFileName,&oSRS, wkbUnknown, NULL);if (poLayer==NULL){printf("Creat layer failed!");exit(1);}//创建层数据的属性fields;OGRFieldDefn oField("Point",OFTString);oField.SetWidth(10);if (poLayer->CreateField(&oField)!=OGRERR_NONE){printf("Create Point Field Failed!");exit(1);}//创建features，写入feature到磁盘;OGRFeature *poFeature;poFeature=OGRFeature::CreateFeature(poLayer->GetLayerDefn());//绘制外边框OGRLineString Line;OGRPoint Point1(Trans[0],Trans[3]); OGRPoint Point2(Trans[0]+width*Trans[1],Trans[3]);OGRPoint Point3(Trans[0]+width*Trans[1],Trans[3]+width*Trans[4]+height*Trans[5]);OGRPoint Point4(Trans[0],Trans[3]+width*Trans[4]+height*Trans[5]);//四个角点的地理坐标，通过行列号计算地理坐标，是通过六参数得到的;Line.addPoint(&Point1);Line.addPoint(&Point2);Line.addPoint(&Point3);Line.addPoint(&Point4);Line.addPoint(&Point1);//水平方向加线;OGRLineString SubHline[50];OGRPoint PointLeft[50],PointRight[50];for (int i=1;i<linenum;i++){PointLeft[i].setX(Trans[0]); //设置左边框上要加线的起点X坐标PointLeft[i].setY((Point4.getY()-Trans[3])/linenum*i+Trans[3]);//设置左边框上要加线的起点Y坐标PointRight[i].setX(Point2.getX());//设置右边框上要加线的起点X坐标PointRight[i].setY((Point4.getY()-Trans[3])/linenum*i+Trans[3]);//设置右边框上要加线的起点Y坐标}for (int i=1;i<linenum;i++){  SubHline[i].addPoint(&PointLeft[i]); //左边框上加点;SubHline[i].addPoint(&PointRight[i]);//右边框上加点;if (i<linenum-1){SubHline[i].addPoint(&PointRight[i+1]); //从右边框的上一点转到下一点，避免交叉斜线的出现;}Line.addSubLineString(&SubHline[i]);//将SubHline数组中的每一个线做为子线段添加到Line对象中;}Line.addPoint(&Point2);//垂直方向加线OGRLineString SubVline[50];OGRPoint PointUp[50],PointDown[50];for (int j=1;j<rows;j++){//添加上边框上的点;PointUp[j].setX((Point2.getX()-Trans[0])/rows*j+Trans[0]);PointUp[j].setY(Trans[3]);//添加下边框上的点;PointDown[j].setX((Point2.getX()-Trans[0])/rows*j+Trans[0]);PointDown[j].setY(Point4.getY());}for (int j=1;j<rows;j++){SubVline[j].addPoint(&PointUp[j]);SubVline[j].addPoint(&PointDown[j]);if (j<rows-1){SubVline[j].addPoint(&PointDown[j+1]); //从下边框的前一点转到后一点，避免交叉斜线的出现;}Line.addSubLineString(&SubVline[j]);}//poFeature->SetGeometryDirectly(&Line);//问题出在这啊！！用SetGeometryDirectly报错，要用SetGeometrypoFeature->SetGeometry(&Line);if (poLayer->CreateFeature(poFeature)!=OGRERR_NONE){printf("Failed create feature in shapefile！");exit(1);}OGRFeature::DestroyFeature(poFeature);OGRDataSource::DestroyDataSource(poDS);printf("创建矢量数据成功！\n");system("pause");return TRUE;}

用ENVI打开生成的shp文件：

 

 

 

注意：在计算四个角点的坐标时，用到了六参数，参考博客：http://blog.csdn.net/ivanljf/article/details/9226463