gdal生成掩膜文件并进行掩膜处理C++
时间: 2023-12-26 21:06:32 浏览: 45
使用GDAL库生成掩膜文件并进行掩膜处理的C++代码如下:
```c++
#include "gdal_priv.h"
#include "cpl_conv.h" // for CPLMalloc()
int main()
{
// Open input raster file
GDALAllRegister();
GDALDataset* poSrcDS = (GDALDataset*)GDALOpen("input.tif", GA_ReadOnly);
if (poSrcDS == NULL)
{
printf("Cannot open input file!\n");
exit(1);
}
// Create output raster file
GDALDriver* poDriver = GetGDALDriverManager()->GetDriverByName("GTiff");
GDALDataset* poDstDS = poDriver->Create("output.tif", poSrcDS->GetRasterXSize(), poSrcDS->GetRasterYSize(), 1, GDT_Byte, NULL);
// Create mask file
GDALDataset* poMaskDS = poDriver->Create("mask.tif", poSrcDS->GetRasterXSize(), poSrcDS->GetRasterYSize(), 1, GDT_Byte, NULL);
// Set mask values
GDALRasterBand* poMaskBand = poMaskDS->GetRasterBand(1);
unsigned char* pMaskData = (unsigned char*)CPLMalloc(sizeof(unsigned char)*poSrcDS->GetRasterXSize()*poSrcDS->GetRasterYSize());
for (int i = 0; i < poSrcDS->GetRasterXSize()*poSrcDS->GetRasterYSize(); i++)
{
pMaskData[i] = 0; // set all mask values to 0
}
poMaskBand->RasterIO(GF_Write, 0, 0, poSrcDS->GetRasterXSize(), poSrcDS->GetRasterYSize(), pMaskData, poSrcDS->GetRasterXSize(), poSrcDS->GetRasterYSize(), GDT_Byte, 0, 0);
// Set mask values for a rectangle region
int nXOff = 100; // x offset of the rectangle
int nYOff = 100; // y offset of the rectangle
int nWinXSize = 200; // width of the rectangle
int nWinYSize = 200; // height of the rectangle
for (int i = nYOff; i < nYOff + nWinYSize; i++)
{
for (int j = nXOff; j < nXOff + nWinXSize; j++)
{
pMaskData[i*poSrcDS->GetRasterXSize() + j] = 255; // set mask value to 255 for the pixels within the rectangle
}
}
poMaskBand->RasterIO(GF_Write, nXOff, nYOff, nWinXSize, nWinYSize, pMaskData + nYOff*poSrcDS->GetRasterXSize() + nXOff, nWinXSize, nWinYSize, GDT_Byte, 0, 0);
// Perform mask operation
GDALRasterBand* poSrcBand = poSrcDS->GetRasterBand(1);
GDALRasterBand* poDstBand = poDstDS->GetRasterBand(1);
poDstBand->SetNoDataValue(0); // set nodata value to 0
poDstBand->Fill(0); // set all output values to 0
poDstBand->SetMaskBand(poMaskBand); // set mask band
poDstBand->RasterIO(GF_Write, 0, 0, poSrcDS->GetRasterXSize(), poSrcDS->GetRasterYSize(), NULL, poSrcDS->GetRasterXSize(), poSrcDS->GetRasterYSize(), GDT_Byte, 0, 0);
// Clean up
CPLFree(pMaskData);
poSrcDS->FlushCache();
poDstDS->FlushCache();
poMaskDS->FlushCache();
GDALClose(poSrcDS);
GDALClose(poDstDS);
GDALClose(poMaskDS);
return 0;
}
```
此代码基于GDAL库生成掩膜文件并进行掩膜处理。首先,通过`GDALOpen()`函数打开输入栅格文件,通过`GDALDriver`创建输出栅格文件和掩膜文件,通过`GDALRasterBand`类设置掩膜值,然后通过`GDALRasterBand::SetMaskBand()`函数将掩膜文件与输出栅格文件关联,最后通过`GDALRasterBand::RasterIO()`函数执行掩膜操作。
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