package com.dudu.gis;
import org.geotools.gce.geotiff.GeoTiffReader;
import org.geotools.geometry.GeneralEnvelope;
import org.junit.Test;
import org.opengis.coverage.grid.GridEnvelope;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import javax.media.jai.ImageLayout;
import java.awt.color.ColorSpace;
import java.awt.image.ColorModel;
import java.awt.image.SampleModel;
import java.io.IOException;
/**
 * 一般對于tiff數(shù)據(jù)的讀取，都會借助于gdal
 * Java API庫，但其實Java的geotools也
 * 封裝了讀取tiff文件的API
 */
public class GeoTiffReaderTest {
    private static final String TIF_PATH = "D:\\Gis開發(fā)\\數(shù)據(jù)\\影像數(shù)據(jù)\\tiff\\china.tif";
    @Test
    public void readTiffFile() throws IOException {
        /**
         * 使用GeoTiffReader
         */
        GeoTiffReader geoTiffReader = new GeoTiffReader(TIF_PATH);
        //獲取到其bbox
        GeneralEnvelope envelope = geoTiffReader.getOriginalEnvelope();
        //獲取到投影信息
        CoordinateReferenceSystem crs = geoTiffReader.getCoordinateReferenceSystem();
        //獲取tiff的gridrange(網(wǎng)格范圍，按像素說就是像素數(shù)量，也就是是tiff的rectangle)
        GridEnvelope gridEnvelope = geoTiffReader.getOriginalGridRange();
        //獲取其圖像相關(guān)信息
        ImageLayout imageLayout = geoTiffReader.getImageLayout();
        //獲取colormodel
        ColorModel colorModel = imageLayout.getColorModel(null);
        //查看其通道數(shù)量
        int num = colorModel.getNumComponents();
        //是否支持透明
        boolean isAlpha = colorModel.hasAlpha();
        //獲取顏色空間
        ColorSpace clorspace = colorModel.getColorSpace();
        //獲取samplemodel
        SampleModel sampleModel = imageLayout.getSampleModel(null);
        //數(shù)據(jù)類型
        int datatype = sampleModel.getDataType();
    }
}