GDAL 保存TIF時，寫入正確的DPI

int dpi = int(25.4 / pixelSize);
char strDpi[100];
_itoa_s(dpi, strDpi, 10);
GDALSetMetadataItem(hDataset, "TIFFTAG_XRESOLUTION", strDpi, NULL);
GDALSetMetadataItem(hDataset, "TIFFTAG_YRESOLUTION", strDpi, NULL);