wet 后台下载

本文深入探讨了深度学习技术在音视频处理领域的应用,包括AI音视频处理、图像处理AR特效、音视频直播流媒体等方向,详细介绍了各种应用场景及实现方法。
nohuo wget -qc http://cdimage.debian.org/debian-cd/7.0.0/amd64/iso-dvd/MD5SUMS &
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我希望在ununtu22.04上安装ros1,但是失败了,以下是我的尝试过程,请给我在此基础上能成功安装ros1的一步步教程(base) casbot@casbot:~$ sudo sed -i 's|https://raw.githubusercontent.com/ros/rosdistro/master|https://mirrors.tuna.tsinghua.edu.cn/rosdistro|g' /etc/ros/rosdep/sources.list.d/20-default.list sed: can't read /etc/ros/rosdep/sources.list.d/20-default.list: No such file or directory (base) casbot@casbot:~$ sudo rosdep init Wrote /etc/ros/rosdep/sources.list.d/20-default.list Recommended: please run rosdep update (base) casbot@casbot:~$ ^C (base) casbot@casbot:~$ rosdep update reading in sources list data from /etc/ros/rosdep/sources.list.d Hit https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/osx-homebrew.yaml Hit https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/base.yaml Hit https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/python.yaml Hit https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/ruby.yaml Hit https://raw.githubusercontent.com/ros/rosdistro/master/releases/fuerte.yaml Query rosdistro index https://raw.githubusercontent.com/ros/rosdistro/master/index-v4.yaml Skip end-of-life distro "ardent" Skip end-of-life distro "bouncy" Skip end-of-life distro "crystal" Skip end-of-life distro "dashing" Skip end-of-life distro "eloquent" Skip end-of-life distro "foxy" Skip end-of-life distro "galactic" Skip end-of-life distro "groovy" Add distro "humble" Skip end-of-life distro "hydro" Skip end-of-life distro "indigo" Skip end-of-life distro "iron" Skip end-of-life distro "jade" Add distro "jazzy" Add distro "kilted" Skip end-of-life distro "kinetic" Skip end-of-life distro "lunar" Skip end-of-life distro "melodic" Skip end-of-life distro "noetic" Add distro "rolling" updated cache in /home/casbot/.ros/rosdep/sources.cache (base) casbot@casbot:~$ cd ~/ros_catkin_ws (base) casbot@casbot:~/ros_catkin_ws$ rosinstall_generator desktop_full --rosdistro noetic --deps \ --exclude roslisp \ --local index-v4.yaml \ > noetic-desktop.rosinstall usage: rosinstall_generator [-h] [--debug] [--verbose] --rosdistro ROSDISTRO [--from-path [FROM_PATH ...]] [--repos [reponame ...]] [--upstream | --upstream-development] [--deps | --deps-up-to [DEPS_UP_TO ...]] [--deps-depth N] [--deps-only] [--wet-only | --dry-only | --catkin-only | --non-catkin-only] [--exclude [EXCLUDE ...]] [--exclude-path [EXCLUDE_PATH ...]] [--flat] [--tar] [--format {rosinstall,repos}] [pkgname ...] rosinstall_generator: error: unrecognized arguments: --local index-v4.yaml (base) casbot@casbot:~/ros_catkin_ws$ rosinstall_generator desktop_full --rosdistro noetic --deps > noetic-desktop.rosinstall Traceback (most recent call last): File "/usr/lib/python3/dist-packages/rosdistro/loader.py", line 43, in load_url fh = urlopen(url, timeout=timeout) File "/usr/lib/python3.10/urllib/request.py", line 216, in urlopen return opener.open(url, data, timeout) File "/usr/lib/python3.10/urllib/request.py", line 519, in open response = self._open(req, data) File "/usr/lib/python3.10/urllib/request.py", line 536, in _open result = self._call_chain(self.handle_open, protocol, protocol + File "/usr/lib/python3.10/urllib/request.py", line 496, in _call_chain result = func(*args) File "/usr/lib/python3.10/urllib/request.py", line 1391, in https_open return self.do_open(http.client.HTTPSConnection, req, File "/usr/lib/python3.10/urllib/request.py", line 1352, in do_open r = h.getresponse() File "/usr/lib/python3.10/http/client.py", line 1375, in getresponse response.begin() File "/usr/lib/python3.10/http/client.py", line 318, in begin version, status, reason = self._read_status() File "/usr/lib/python3.10/http/client.py", line 279, in _read_status line = str(self.fp.readline(_MAXLINE + 1), "iso-8859-1") File "/usr/lib/python3.10/socket.py", line 705, in readinto return self._sock.recv_into(b) File "/usr/lib/python3.10/ssl.py", line 1303, in recv_into return self.read(nbytes, buffer) File "/usr/lib/python3.10/ssl.py", line 1159, in read return self._sslobj.read(len, buffer) TimeoutError: The read operation timed out During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/usr/bin/rosinstall_generator", line 33, in <module> sys.exit(load_entry_point('rosinstall-generator==0.1.23', 'console_scripts', 'rosinstall_generator')()) File "/usr/lib/python3/dist-packages/rosinstall_generator/cli.py", line 155, in main rosinstall_data = generate_rosinstall(args.rosdistro, args.package_names, File "/usr/lib/python3/dist-packages/rosinstall_generator/generator.py", line 267, in generate_rosinstall wet_package_names, unreleased_repo_names = _get_packages_for_repos(distro_name, repo_names, source=upstream_source_version) File "/usr/lib/python3/dist-packages/rosinstall_generator/generator.py", line 93, in _get_packages_for_repos wet_distro = get_wet_distro(distro_name) File "/usr/lib/python3/dist-packages/rosinstall_generator/generator.py", line 224, in get_wet_distro _wet_distro = _get_wet_distro(distro_name) File "/usr/lib/python3/dist-packages/rosinstall_generator/distro.py", line 45, in get_distro index = get_index(get_index_url()) File "/usr/lib/python3/dist-packages/rosdistro/__init__.py", line 102, in get_index yaml_str = load_url(url) File "/usr/lib/python3/dist-packages/rosdistro/loader.py", line 56, in load_url raise socket.timeout(str(e) + ' (%s)' % url) TimeoutError: The read operation timed out (https://raw.githubusercontent.com/ros/rosdistro/master/index-v4.yaml) (base) casbot@casbot:~/ros_catkin_ws$ wget https://ghproxy.com/https://raw.githubusercontent.com/ros/rosdistro/master/index-v4.yaml --2025-07-22 15:09:11-- https://ghproxy.com/https://raw.githubusercontent.com/ros/rosdistro/master/index-v4.yaml Resolving ghproxy.com (ghproxy.com)... 144.24.81.189 Connecting to ghproxy.com (ghproxy.com)|144.24.81.189|:443... connected. Unable to establish SSL connection. (base) casbot@casbot:~/ros_catkin_ws$ rosinstall_generator desktop_full --rosdistro noetic --deps \ --exclude roslisp \ --local index-v4.yaml \ > noetic-desktop.rosinstall usage: rosinstall_generator [-h] [--debug] [--verbose] --rosdistro ROSDISTRO [--from-path [FROM_PATH ...]] [--repos [reponame ...]] [--upstream | --upstream-development] [--deps | --deps-up-to [DEPS_UP_TO ...]] [--deps-depth N] [--deps-only] [--wet-only | --dry-only | --catkin-only | --non-catkin-only] [--exclude [EXCLUDE ...]] [--exclude-path [EXCLUDE_PATH ...]] [--flat] [--tar] [--format {rosinstall,repos}] [pkgname ...] rosinstall_generator: error: unrecognized arguments: --local index-v4.yaml (base) casbot@casbot:~/ros_catkin_ws$ ^C (base) casbot@casbot:~/ros_catkin_ws$
最新发布
07-23
<think>好的,我现在需要帮助用户通过Google Earth Engine下载MODIS地表湿数据。首先,我得确认用户的需求是什么。他们提到了MODIS地表湿数据,但需要明确具体的数据集名称或参数。MODIS有多个产品,比如MOD44W是水体数据集,或者可能是土壤湿度相关的产品?可能需要进一步确认,但用户可能指的是地表水体或湿度数据。 接下来,用户提到了使用GEE,所以步骤应该包括在GEE平台上找到对应的数据集,筛选数据,处理并导出。首先,我应该回忆一下GEE中可用的MODIS数据集。例如,MOD44W是MODIS Terra Water Masks数据集,可能符合用户需求。另外,还有MOD09GA地表反射率产品中的某些波段可能相关,或者是MOD16蒸散发数据?需要确认正确的数据集。 然后,用户可能不熟悉GEE的代码编写,所以需要提供一个示例脚本。步骤应该包括:访问GEE平台,找到数据集,按时间、区域筛选,应用必要的处理(比如选择波段),然后导出到Google Drive或Google Cloud。 同时,需要注意用户的引用要求。用户提供了两个引用链接,其中第一个是Landsat数据集的,可能需要检查是否有相关的引用需要替换为MODIS的。不过用户可能希望引用他们提供的链接,但需要确认是否正确。比如引用[^1]是关于Landsat的,可能与MODIS无关,但用户可能只是希望保留这些引用格式,所以可能需要调整引用内容,或者指出正确的数据来源。 此外,用户可能需要了解如何调整时间范围、区域,以及处理云污染等问题。比如,MODIS数据通常有云掩膜,但可能需要额外的处理步骤。另外,导出数据时需要注意分辨率和格式的选择。 现在,我需要整理步骤: 1. 访问GEE并找到正确的MODIS数据集。 2. 筛选时间和区域。 3. 处理数据(如选择波段、应用比例因子)。 4. 导出数据。 可能的问题点在于确定正确的数据集名称和波段名称。例如,MOD44W的波段是'water_mask',而其他数据集可能不同。需要验证这些信息是否正确。 另外,用户可能不知道如何在GEE中编写脚本,所以需要提供一个具体的代码示例,并解释每个步骤的作用。例如,使用ee.ImageCollection加载数据集,用.filterDate和.filterBounds筛选,用.select选择波段,然后导出到Drive。 还要注意权限问题,用户需要登录GEE账号,并授权访问Drive。导出任务需要手动启动,这些都需要在步骤中说明。 最后,生成相关问题,帮助用户进一步了解如何处理数据或解决常见问题,比如云掩膜、数据预处理等。</think>通过Google Earth Engine (GEE) 下载MODIS地表湿数据可按照以下步骤操作: ### 一、数据定位与筛选 1. **访问数据集目录** 在GEE数据集中搜索`MODIS/006/MOD44W`,该数据集提供全球250米分辨率的水体掩膜数据,包含地表湿润区域信息。 ```javascript var dataset = ee.ImageCollection('MODIS/006/MOD44W'); ``` 2. **设置时空范围** ```javascript var date_filter = dataset.filterDate('2020-01-01', '2020-12-31'); //时间筛选 var region = ee.Geometry.Rectangle([经度最小值, 纬度最小值, 经度最大值, 纬度最大值]); //空间范围 ``` ### 二、数据处理与导出 3. **选择数据波段** MOD44W数据集的`water_mask`波段表示水体覆盖比例(0-100%),适用于地表湿度分析: ```javascript var image = date_filter.mean().select('water_mask'); ``` 4. **设置导出参数** ```javascript Export.image.toDrive({ image: image.clip(region), description: 'MODIS_WetData_Export', folder: 'GEE_Exports', region: region, scale: 250, //与原始数据分辨率一致 maxPixels: 1e13 }); ``` ### 三、完整代码示例 ```javascript // 定义区域(以长三角为例) var region = ee.Geometry.Rectangle([116, 29, 123, 33]); // 加载数据集 var modis = ee.ImageCollection('MODIS/006/MOD44W') .filterDate('2020-01-01', '2020-12-31') .filterBounds(region); // 计算年度均值并选择波段 var composite = modis.mean().select('water_mask'); // 可视化参数设置 var visParams = {min: 0, max: 100, palette: ['white', 'blue']}; // 添加图层到地图 Map.centerObject(region, 6); Map.addLayer(composite, visParams, 'Water Mask'); // 导出到Google Drive Export.image.toDrive({ image: composite.clip(region), description: 'YangtzeDelta_WaterMask_2020', folder: 'MODIS_Output', region: region, scale: 250, maxPixels: 1e13 }); ``` ### 关键注意事项 - 需先注册GEE账号并通过代码编辑器访问 - 导出前建议使用`Map.addLayer`预览数据 - 年度数据使用`.mean()`聚合,季度数据可改用`.median()` - 导出任务需在**Tasks**标签页手动启动
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