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Python + GDAL 栅格数据读取实战教程

  • 2026-07-01 05:06:09
Python + GDAL 栅格数据读取实战教程

在地理信息系统(GIS)领域,栅格数据是最常见的数据类型之一。无论是卫星影像、数字高程模型(DEM)还是气象数据,都以栅格格式存储。今天我们就用 Python + GDAL 来揭开栅格数据的神秘面纱。


一、什么是栅格数据

栅格数据是由规则网格(像素)组成的矩阵,每个像素都包含一个值,代表该位置的地理属性。

栅格 vs 矢量

类型
特点
示例
栅格
像素矩阵,适合连续数据
遥感影像、DEM、温度分布图
矢量
点线面要素,适合离散数据
道路、建筑物、行政边界

常见栅格格式

  • TIFF/GeoTIFF
    : 最常用的地理栅格格式,支持投影信息
  • JPEG/JPEG2000
    : 压缩影像格式
  • PNG
    : 无损压缩,支持透明通道
  • NetCDF
    : 多维科学数据格式

二、GDAL 环境搭建

2.1 安装方法

Windows 系统:

# 方法1:使用预编译包(推荐)pip install GDAL-3.4.1-cp39-none-win_amd64.whl# 方法2:conda安装conda install -c conda-forge gdal

2.2 导入库

import osgeofrom osgeo import gdal, ogr, osrimport numpy as np

三、核心代码解析

3.1 读取栅格文件

defreadTif():# 文件路径    path = r"G:\data\q.tif"# 启用异常处理    gdal.UseExceptions()# 以只读模式打开文件    data = gdal.Open(path, gdal.GA_ReadOnly)# 检查文件是否成功打开if data isNone:print("无法打开文件!")return

3.2 获取基本信息

# 获取栅格尺寸    x_size = data.RasterXSize  # 列数    y_size = data.RasterYSize  # 行数print(f"栅格尺寸:{x_size} 列 × {y_size} 行")# 获取驱动信息    driver = data.GetDriver()print(f"文件格式:{driver.LongName}")# 获取描述信息    description = data.GetDescription()print(f"文件描述:{description}")

3.3 波段操作

# 获取波段(从1开始计数)    band = data.GetRasterBand(1)# 读取指定区域数据# ReadAsArray(起始列, 起始行, 宽度, 高度)    array = band.ReadAsArray(48251010).astype(np.int32)print("10×10像素数据:")print(array)

3.4 地理变换参数详解

# 获取地理变换参数    transform = data.GetGeoTransform()# 解析六参数    origin_x = transform[0]  # 左上角X坐标    pixel_width = transform[1]  # 水平分辨率    rotation_x = transform[2]  # 行旋转(通常为0)    origin_y = transform[3]  # 左上角Y坐标    rotation_y = transform[4]  # 列旋转(通常为0)    pixel_height = transform[5]  # 垂直分辨率(通常为负)print(f"\n地理变换参数:")print(f"左上角经度:{origin_x}")print(f"左上角纬度:{origin_y}")print(f"水平分辨率:{pixel_width} 米")print(f"垂直分辨率:{abs(pixel_height)} 米")

坐标转换公式:

地理X坐标 = origin_x + 列号 × pixel_width + 行号 × rotation_x地理Y坐标 = origin_y + 列号 × rotation_y + 行号 × pixel_height

实际应用:

# 计算指定像素的地理坐标    col = 48174    row = 25437    lon = transform[0] + col * transform[1]    lat = transform[3] + row * transform[5]print(f"\n像素({col},{row})对应的地理坐标:")print(f"经度:{lon}")print(f"纬度:{lat}")

3.5 投影信息解析

# 获取投影信息(WKT格式)    projection = data.GetProjection()print(f"\n投影信息:{projection}")# 创建空间参考对象    reference = osr.SpatialReference()    reference.ImportFromWkt(projection)# 获取基准面信息    authority_name = reference.GetAuthorityName("DATUM")    authority_code = reference.GetAuthorityCode("DATUM")print(f"基准面:{authority_name}{authority_code}")# 获取EPSG编码    epsg_code = reference.GetAttrValue('AUTHORITY'1)print(f"EPSG编码:{epsg_code}")# 获取单位    unit = reference.GetAttrValue('UNIT'0)print(f"单位:{unit}")

四、实用技巧

4.1 多波段数据处理

# 获取波段数量band_count = data.RasterCountprint(f"波段数:{band_count}")# 遍历所有波段for i inrange(1, band_count + 1):    band = data.GetRasterBand(i)print(f"波段{i}数据类型:{gdal.GetDataTypeName(band.DataType)}")

4.2 数据类型转换

# 常见数据类型映射data_type_mapping = {    gdal.GDT_Byte: "8位无符号整数",    gdal.GDT_UInt16: "16位无符号整数",    gdal.GDT_Int16: "16位有符号整数",    gdal.GDT_UInt32: "32位无符号整数",    gdal.GDT_Int32: "32位有符号整数",    gdal.GDT_Float32: "32位浮点数",    gdal.GDT_Float64: "64位浮点数"}

4.3 保存处理结果

# 创建输出文件driver = gdal.GetDriverByName("GTiff")output_path = "output.tif"output_ds = driver.Create(    output_path,    x_size, y_size, 1,  # 宽度、高度、波段数    gdal.GDT_Float32  # 数据类型)# 设置地理变换和投影output_ds.SetGeoTransform(transform)output_ds.SetProjection(projection)# 写入数据output_band = output_ds.GetRasterBand(1)output_band.WriteArray(array)# 释放资源output_ds = None

五、完整代码

import osgeofrom osgeo import gdal, ogr, osrimport numpy as npdefreadTif():# 1. 打开文件    path = r"G:\项目_数据\黄泥河\q.tif"    gdal.UseExceptions()    data = gdal.Open(path, gdal.GA_ReadOnly)# 2. 获取基本信息    x_size = data.RasterXSize    y_size = data.RasterYSizeprint(f"栅格尺寸:{x_size} × {y_size}")# 3. 读取波段数据    band = data.GetRasterBand(1)    array = band.ReadAsArray(48251010).astype(np.int32)print("采样数据:\n", array)# 4. 解析地理变换    transform = data.GetGeoTransform()print(f"左上角坐标:({transform[0]:.6f}{transform[3]:.6f})")# 5. 解析投影信息    projection = data.GetProjection()    reference = osr.SpatialReference()    reference.ImportFromWkt(projection)    epsg_code = reference.GetAttrValue('AUTHORITY'1)print(f"EPSG编码:{epsg_code}")if __name__ == '__main__':    readTif()

💡 小提示:在实际项目中,记得及时释放 GDAL Dataset 对象,避免内存泄漏哦!

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  1. CONNECT:[ UseTime:0.001357s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001844s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000897s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000733s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001406s ]
  6. SELECT * FROM `set` [ RunTime:0.000583s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001575s ]
  8. SELECT * FROM `article` WHERE `id` = 492836 LIMIT 1 [ RunTime:0.015614s ]
  9. UPDATE `article` SET `lasttime` = 1783086998 WHERE `id` = 492836 [ RunTime:0.010375s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000810s ]
  11. SELECT * FROM `article` WHERE `id` < 492836 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001960s ]
  12. SELECT * FROM `article` WHERE `id` > 492836 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001695s ]
  13. SELECT * FROM `article` WHERE `id` < 492836 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.037032s ]
  14. SELECT * FROM `article` WHERE `id` < 492836 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002306s ]
  15. SELECT * FROM `article` WHERE `id` < 492836 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.026266s ]
0.265094s