netcdf geotiff java_R-NC格式数据转GeoTIFF

要将 NetCDF 或 R-NC 格式的数据转换为 GeoTIFF 格式，可以使用 Java 或 R 中的 GDAL 库。下面是一个 Java 示例代码，可以将 NetCDF 文件转换为 GeoTIFF 文件：

import org.gdal.gdal.gdal;
import org.gdal.gdalconst.gdalconst;
import org.gdal.osr.SpatialReference;
import org.gdal.osr.osr;

public class NetcdfToGeoTiff {

  public static void main(String[] args) {
    // Register GDAL drivers
    gdal.AllRegister();

    // Open NetCDF file
    String inputFilePath = "path/to/netcdf/file.nc";
    gdal.Dataset netcdfDataset = gdal.Open(inputFilePath, gdalconst.GA_ReadOnly);

    // Get number of bands and dimensions
    int numBands = netcdfDataset.getRasterCount();
    int numDims = netcdfDataset.getRasterXSize() * netcdfDataset.getRasterYSize();

    // Read data from NetCDF file
    float[] data = new float[numDims * numBands];
    netcdfDataset.readRaster(0, 0, netcdfDataset.getRasterXSize(), netcdfDataset.getRasterYSize(), data);

    // Create output GeoTIFF file
    String outputFilePath = "path/to/geotiff/file.tiff";
    gdal.Driver driver = gdal.GetDriverByName("GTiff");
    gdal.Dataset geotiffDataset = driver.Create(outputFilePath, netcdfDataset.getRasterXSize(),
        netcdfDataset.getRasterYSize(), numBands, gdalconst.GDT_Float32);

    // Set projection and geotransform
    SpatialReference srs = new SpatialReference(netcdfDataset.GetProjectionRef());
    geotiffDataset.SetProjection(srs.ExportToWkt());
    double[] geoTransform = new double[6];
    netcdfDataset.GetGeoTransform(geoTransform);
    geotiffDataset.SetGeoTransform(geoTransform);

    // Write data to GeoTIFF file
    for (int i = 0; i < numBands; i++) {
      gdal.Band band = geotiffDataset.GetRasterBand(i + 1);
      band.WriteRaster(0, 0, netcdfDataset.getRasterXSize(), netcdfDataset.getRasterYSize(),
          data, netcdfDataset.getRasterXSize(), netcdfDataset.getRasterYSize(), gdalconst.GDT_Float32, 0, 0);
      band.FlushCache();
    }

    // Close datasets
    geotiffDataset.delete();
    netcdfDataset.delete();
  }
}

请注意，此示例代码需要 GDAL 和 JavaGDAL 库。你需要将这些库添加到你的项目中。

同样，你也可以使用 R 中的 GDAL 包来转换 R-NC 数据。下面是一个简单的 R 示例代码：

library(gdal)

# Open R-NC file
inputFilePath <- "path/to/r-nc/file.nc"
rncDataset <- gdalUtils::gdal_open(inputFilePath)

# Get number of bands and dimensions
numBands <- rncDataset@nbands
numDims <- rncDataset@nrows * rncDataset@ncols

# Read data from R-NC file
data <- gdalUtils::gdal_read(rncDataset)

# Create output GeoTIFF file
outputFilePath <- "path/to/geotiff/file.tiff"
geotiffDataset <- gdalUtils::gdal_translate(data, dst_dataset=outputFilePath, format="GTiff")

# Set projection and geotransform
geotiffDataset@proj4string <- rncDataset@proj4string
geotiffDataset@extent <- rncDataset@extent

# Close datasets
gdalUtils::gdal_close(rncDataset)
gdalUtils::gdal_close(geotiffDataset)

请注意，此示例代码需要 GDAL 和 gdalUtils 包。你需要将这些库添加到你的 R 环境中。