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Python | 批量裁剪ICESat-2数据(免费代码见文末)

  • 2026-07-06 16:52:27
Python | 批量裁剪ICESat-2数据(免费代码见文末)

LXX

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前言:

ICESat-2卫星搭载的ATLAS激光雷达系统,自2018年发射以来已积累海量全球光子数据。其ATL03产品提供了每个光子事件的三维坐标和时间信息,广泛应用于冰川监测、植被高度反演、湖泊水位变化等领域。然而,单轨ATL03数据常覆盖上千公里,研究者通常只关注某个流域或行政区内的小范围数据。传统裁剪方式依赖GIS软件手动操作,面对数十甚至上百个文件时效率极低。

因此,本文分享基于Python的图形化批量裁剪工具,支持单文件和文件夹批处理。


希望各位同学点个关注,点个小赞,这将是更新的动力,不胜感激❥(^_-)

1

数据

本工具处理的数据为ICESat-2卫星的ATL03产品,存储格式为HDF5。每个HDF5文件包含gt1l、gt1r、gt2l、gt2r、gt3l、gt3r六个波束组,每个波束下有land_segments、heights等多个层级,其中heights/lat_ph和heights/lon_ph数据集记录了每个光子事件的纬度和经度,这是空间裁剪的核心依据。裁剪边界由用户提供的SHP文件定义,支持多边形和多部件几何。数据输入支持单个H5文件或包含多个H5文件的文件夹,输出为保持原始HDF5层级结构的裁剪后文件。

2

方法

2.1 坐标参考系统一

裁剪的第一步是读取SHP文件并统一坐标系。ICESat-2数据基于WGS84地理坐标系,如果SHP是投影坐标系,直接计算会导致空间错位。因此,代码使用geopandas读取SHP后,强制转换为EPSG:4326:

gdf = gpd.read_file(shp_path)if gdf.crs is None:    raise ValueError("shp没有CRS")gdf = gdf.to_crs("EPSG:4326")
转换后,使用unary_union将SHP中所有几何要素合并为一个整体裁剪区域,确保多部件或不连续的研究区能被统一处理:
region = gdf.geometry.unary_union

2.2 遍历波束并提取坐标

接下来打开HDF5文件,遍历每个波束组。由于ICESat-2有强光束和弱光束之分,代码通过判断组名是否以“gt”开头来筛选:

for beam in f_in.keys():    if not beam.startswith("gt"):        continue

对每个波束提取光子经纬度坐标。lat_ph和lon_ph是一维数组,每个元素对应一个光子事件的空间位置:

lat = np.array(in_beam["heights/lat_ph"])lon = np.array(in_beam["heights/lon_ph"])

2.3 向量化空间查询生成掩膜

获得坐标数组后,需要判断每个光子是否落在裁剪区域内。这里不使用逐点循环,而是调用shapely的向量化contains函数,一次性对全部坐标完成包含判断,返回布尔掩膜:

mask = contains(region, lon, lat)

该函数底层基于NumPy实现,可高效处理百万级光子点。如果掩膜全为False,说明该波束与SHP无交集,直接跳过:

if np.sum(mask) == 0:    continue

2.4 递归复制与智能裁剪

裁剪的核心在于保留HDF5文件的层级结构,同时只对与光子一一对应的数据集应用掩膜。为此,定义了一个递归函数copy_group,遍历原始文件的所有Group和Dataset:

def copy_group(in_grp, out_grp):    for key in in_grp.keys():        item = in_grp[key]        ifisinstance(item, h5py.Group):            sub = out_grp.create_group(key)            copy_group(item, sub)        elif isinstance(item, h5py.Dataset):            data = item[()]            if data.shape == lat.shape:                data = data[mask]            out_grp.create_dataset(key, data=data)

对于Group,递归进入下一层;对于Dataset,判断其形状是否与经纬度数组一致——若一致则应用掩膜裁剪,若不一致则保留原样。这样设计保证了像轨道参数、元数据等非光子级数据不会被错误裁剪。

2.5 图形界面与多线程

为降低使用门槛,工具采用Tkinter构建图形界面。用户通过按钮分别选择H5文件或文件夹、SHP边界和输出路径。为避免大文件处理时界面卡死,裁剪任务被放在子线程中运行:

def start(self):    t = threading.Thread(target=self.run)    t.start()

日志框实时输出当前处理的波束、坐标范围和裁剪点数,让用户直观掌握进度。

2.6 批量处理逻辑

在运行逻辑中,工具判断用户选择的是单个文件还是文件夹。单文件模式直接调用clip_single函数;批量模式则通过glob搜索所有H5文件,逐个处理并自动按“原名_clipped.h5”命名输出:

if self.h5_path:    clip_single(self.h5_path, outself.shp_path, self.log)elif self.folder_path:    files = glob(os.path.join(self.folder_path, "*.h5"))    for f in files:        out = f.replace(".h5""_clipped.h5")        clip_single(f, outself.shp_path, self.log)

3

完整代码

看到最后,如果有用请大家点个关注,点个小赞,这将是更新的动力,不胜感激❥(^_-)

# -*- coding: utf-8 -*-"""# -*- coding: utf-8 -*-@Time: 2026/6/5 20:25@Author: LXX@File: 批量裁剪.py@IDE:PyCharm@Motto:ABC(Always Be Coding)"""import tkinter as tkfrom tkinter import filedialog, messageboximport threadingimport osimport h5pyimport numpy as npimport geopandas as gpdfrom shapely.vectorized import containsfrom glob import glob# =========================# 核心裁剪函数# =========================def clip_single(input_h5, output_h5, shp_path, log_func):    """    裁剪单个ATL03 H5文件    """    log_func("读取 shp...")    gdf = gpd.read_file(shp_path)    if gdf.crs is None:        raise ValueError("shp没有CRS")    gdf = gdf.to_crs("EPSG:4326")    region = gdf.geometry.unary_union    log_func(f"shp范围: {region.bounds}")    with h5py.File(input_h5, "r"as f_in, h5py.File(output_h5, "w"as f_out:        for beam in f_in.keys():            if not beam.startswith("gt"):                continue            log_func(f"处理 {beam}")            in_beam = f_in[beam]            out_beam = f_out.create_group(beam)            if "heights/lat_ph" not in in_beam:                log_func("缺少lat/lon")                continue            lat = np.array(in_beam["heights/lat_ph"])            lon = np.array(in_beam["heights/lon_ph"])            log_func(f"lat范围 {np.nanmin(lat)} ~ {np.nanmax(lat)}")            mask = contains(region, lon, lat)            log_func(f"shp内点数: {np.sum(mask)}")            if np.sum(mask) == 0:                log_func("无交集")                continue            def copy_group(in_grp, out_grp):                """                递归复制HDF5组,并应用掩码                """                for key in in_grp.keys():                    item = in_grp[key]                    if isinstance(item, h5py.Group):                        sub = out_grp.create_group(key)                        copy_group(item, sub)                    elif isinstance(item, h5py.Dataset):                        data = item[()]                        if data.shape == lat.shape:                            data = data[mask]                        out_grp.create_dataset(key, data=data)            copy_group(in_beam, out_beam)    log_func("✔ 完成裁剪")# =========================# GUI 主程序# =========================class App:    """    图形界面应用程序    """    def __init__(self, root):        """        初始化GUI组件        """        self.root = root        self.root.title("ICESAT-2 ATL03 裁剪工具")        self.h5_path = ""        self.folder_path = ""        self.shp_path = ""        self.out_path = ""        # ---- UI ----        tk.Button(root, text="选择H5文件", command=self.select_h5).pack()        tk.Button(root, text="选择文件夹(批量)", command=self.select_folder).pack()        tk.Button(root, text="选择shp", command=self.select_shp).pack()        tk.Button(root, text="选择输出目录", command=self.select_out).pack()        tk.Button(root, text="开始裁剪", bg="green", fg="white",                  command=self.start).pack()        self.text = tk.Text(root, height=20)        self.text.pack()    # =========================    # 选择文件    # =========================    def select_h5(self):        """选择单个H5文件"""        self.h5_path = filedialog.askopenfilename(filetypes=[("H5","*.h5")])        self.log("H5: " + self.h5_path)    def select_folder(self):        """选择包含H5文件的文件夹"""        self.folder_path = filedialog.askdirectory()        self.log("Folder: " + self.folder_path)    def select_shp(self):        """选择shp文件"""        self.shp_path = filedialog.askopenfilename(filetypes=[("shp","*.shp")])        self.log("shp: " + self.shp_path)    def select_out(self):        """选择输出目录"""        self.out_path = filedialog.askdirectory()        self.log("Output: " + self.out_path)    # =========================    # 日志    # =========================    def log(self, msg):        """在文本框中显示日志信息"""        self.text.insert(tk.END, msg + "\n")        self.text.see(tk.END)    # =========================    # 启动线程    # =========================    def start(self):        """启动处理线程"""        t = threading.Thread(target=self.run)        t.start()    # =========================    # 运行逻辑    # =========================    def run(self):        """        执行裁剪的主逻辑        """        if not self.shp_path:            messagebox.showerror("错误""请选择shp")            return        # ---- 单文件 ----        if self.h5_path:            out = self.h5_path.replace(".h5""_clipped.h5")            self.log("开始单文件裁剪...")            clip_single(self.h5_path, out, self.shp_path, self.log)        # ---- 批量 ----        elif self.folder_path:            files = glob(os.path.join(self.folder_path, "*.h5"))            self.log(f"批量文件: {len(files)}")            for f in files:                out = f.replace(".h5""_clipped.h5")                self.log("处理: " + f)                clip_single(f, out, self.shp_path, self.log)        else:            messagebox.showerror("错误""请选择H5或文件夹")# =========================# 启动# =========================if __name__ == "__main__":    root = tk.Tk()    app = App(root)    root.mainloop()

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  1. CONNECT:[ UseTime:0.000434s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000635s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000266s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000255s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000604s ]
  6. SELECT * FROM `set` [ RunTime:0.000216s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000646s ]
  8. SELECT * FROM `article` WHERE `id` = 503704 LIMIT 1 [ RunTime:0.002101s ]
  9. UPDATE `article` SET `lasttime` = 1783333671 WHERE `id` = 503704 [ RunTime:0.015389s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000290s ]
  11. SELECT * FROM `article` WHERE `id` < 503704 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000520s ]
  12. SELECT * FROM `article` WHERE `id` > 503704 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000459s ]
  13. SELECT * FROM `article` WHERE `id` < 503704 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007077s ]
  14. SELECT * FROM `article` WHERE `id` < 503704 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.021748s ]
  15. SELECT * FROM `article` WHERE `id` < 503704 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001818s ]
0.121194s