在python中使用liblas和laspy读取las文件的问题

Posted 2023-03-23

【中文标题】在python中使用liblas和laspy读取las文件的问题

【英文标题】：problem in reading las file using liblas and laspy in python

【发布时间】：2019-08-27 17:20:10

【问题描述】：

我 pip 安装了 liblas，它安装得很好，但是，当我尝试导入 liblas 时，它仍然引发了一个错误，显示在第一个错误中。

然后我 pip 安装了 laspy，它安装得很好，并尝试使用 laspy.file.File 从中读取我的 las 文件，但它再次引发了我在第二个错误中显示的错误

OSError                                   Traceback (most recent call last)
<ipython-input-6-7ba94c832967> in <module>
----> 1 import liblas

C:\ProgramData\Anaconda3\lib\site-packages\liblas\__init__.py in <module>
      1 #from .core import *
----> 2 from .core import get_version
      3 from .core import las
      4 version = get_version()
      5 HAVE_GDAL = bool(las.LAS_IsGDALEnabled())

C:\ProgramData\Anaconda3\lib\site-packages\liblas\core.py in <module>
    137         original_path = os.environ['PATH']
    138         os.environ['PATH'] = "%s;%s" % (local_dlls, original_path)
--> 139         las = ctypes.CDLL(lib_name)
    140 
    141         def free(m):

C:\ProgramData\Anaconda3\lib\ctypes\__init__.py in __init__(self, name, mode, handle, use_errno, use_last_error)
    354 
    355         if handle is None:
--> 356             self._handle = _dlopen(self._name, mode)
    357         else:
    358             self._handle = handle

OSError: [WinError 126] The specified module could not be found

LaspyException                            Traceback (most recent call last)
<ipython-input-5-20f5fbf35bba> in <module>
----> 1 inFile = File('2_DLL.las', mode='r')

C:\ProgramData\Anaconda3\lib\site-packages\laspy\file.py in __init__(self, filename, header, vlrs, mode, in_srs, out_srs, evlrs)
     62         self.in_srs = in_srs
     63         self.out_srs = out_srs
---> 64         self.open()
     65 
     66     def open(self):

C:\ProgramData\Anaconda3\lib\site-packages\laspy\file.py in open(self)
     73             ## Make sure we have a header
     74             if self._header is None:
---> 75                 self._reader = base.Reader(self.filename, mode=self._mode)
     76                 self._header = self._reader.get_header()
     77             else:

C:\ProgramData\Anaconda3\lib\site-packages\laspy\base.py in __init__(self, filename, mode, header, vlrs, evlrs)
    271         self.padded = False
    272         if self.mode in ("r", "r-"):
--> 273             self.setup_read_write(vlrs,evlrs, read_only=True)
    274             return
    275         elif self.mode == "rw":

C:\ProgramData\Anaconda3\lib\site-packages\laspy\base.py in setup_read_write(self, vlrs, evlrs, read_only)
    300         self.data_provider.open(open_mode)
    301         self.data_provider.map()
--> 302         self.header_format = laspy.util.Format("h" + self.grab_file_version())
    303         self.get_header(self.grab_file_version())
    304         self.populate_vlrs()

C:\ProgramData\Anaconda3\lib\site-packages\laspy\util.py in __init__(self, fmt, overwritable, extra_bytes, extradims)
    150                         "EVLR", "h1.0", "h1.1", "h1.2", "h1.3", "h1.4",
    151                         "extra_bytes_struct", "None")):
--> 152             raise LaspyException("Invalid format: " + str(fmt))
    153         if self.fmt == None:
    154             return

LaspyException: Invalid format: h82.83

【参考方案1】：

先决条件 Python 绑定需要安装 libLAS 基础 C 和 C++ 库。从http://liblas.org/download.html 获取库的源代码副本，并按照http://liblas.org/compilation.html 的编译说明构建和安装库。