/usr/share/pyshared/liblas/header.py is in python-liblas 1.2.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/******************************************************************************
* $Id$
*
* Project: libLAS - http://liblas.org - A BSD library for LAS format data.
* Purpose: Python LASHeader implementation
* Author: Howard Butler, hobu.inc@gmail.com
*
******************************************************************************
* Copyright (c) 2008, Howard Butler
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided
* with the distribution.
* * Neither the name of the Martin Isenburg or Iowa Department
* of Natural Resources nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
****************************************************************************/
"""
import core
import datetime
import guid
import vlr
import srs
def leap_year(year):
if (year % 400) == 0:
return True
elif (year % 100) == 0:
return True
elif (year % 4) == 0:
return False
return False
class Header(object):
def __init__(self, owned=True, handle=None):
if handle:
self.handle = handle
else:
self.handle = core.las.LASHeader_Create()
self.owned = owned
def __del__(self):
if self.owned:
if self.handle and core:
core.las.LASHeader_Destroy(self.handle)
def get_filesignature(self):
"""Returns the file signature for the file. It should always be LASF"""
return core.las.LASHeader_GetFileSignature(self.handle)
file_signature = property(get_filesignature)
def get_filesourceid(self):
return core.las.LASHeader_GetFileSourceId(self.handle)
filesource_id = property(get_filesourceid)
def get_projectid(self):
"""Returns the ProjectID/GUID for the file. libLAS does not currently support setting this value from Python"""
return core.las.LASHeader_GetProjectId(self.handle)
project_id = property(get_projectid)
def get_guid(self):
"""Returns the GUID for the file as a liblas.guid.GUID"""
return guid.GUID(handle=core.las.LASHeader_GetGUID(self.handle))
def set_guid(self, value):
"""Sets the GUID for the file. It must be a liblas.guid.GUID"""
return core.las.LASHeader_SetGUID(self.handle, value.handle)
guid = property(get_guid, set_guid)
def get_majorversion(self):
"""Returns the major version for the file. Expect this value to always be 1"""
return core.las.LASHeader_GetVersionMajor(self.handle)
def set_majorversion(self, value):
"""Sets the major version for the file. Only the value 1 is accepted at this time"""
return core.las.LASHeader_SetVersionMajor(self.handle, value)
major_version = property(get_majorversion, set_majorversion)
def get_minorversion(self):
"""Returns the minor version of the file. Expect this value to always be 0, 1, or 2"""
return core.las.LASHeader_GetVersionMinor(self.handle)
def set_minorversion(self, value):
"""Sets the minor version of the file. The value should be 0 for 1.0 LAS files and 1 for 1.1 LAS files"""
return core.las.LASHeader_SetVersionMinor(self.handle, value)
minor_version = property(get_minorversion, set_minorversion)
def get_systemid(self):
"""Returns the system identifier specified in the file"""
return core.las.LASHeader_GetSystemId(self.handle)
def set_systemid(self, value):
"""Sets the system identifier. The value is truncated to 31 characters"""
return core.las.LASHeader_SetSystemId(self.handle, value[0:31])
system_id = property(get_systemid, set_systemid)
def get_softwareid(self):
"""Returns the software identifier specified in the file"""
return core.las.LASHeader_GetSoftwareId(self.handle)
def set_softwareid(self, value):
"""Sets the software identifier.
The value is truncated to 31 characters.
Parameters
----------
value : a string that will automatically be truncated to 31 characters
Example
-------
>>> h.software_id
'libLAS 1.0'
>>> h.software_id = 'hobu'
>>> h.software_id
'hobu'
>>> h.software_id = 'hobu'*9
>>> h.software_id
'hobuhobuhobuhobuhobuhobuhobuhob'
"""
return core.las.LASHeader_SetSoftwareId(self.handle, value[0:31])
software_id = property(get_softwareid, set_softwareid)
def get_date(self):
"""Return the header's date as a datetime.datetime. If no date is set in the
header, None is returned.
Note that dates in LAS headers are not transitive because the header
only stores the year and the day number.
"""
day = core.las.LASHeader_GetCreationDOY(self.handle)
year = core.las.LASHeader_GetCreationYear(self.handle)
if year == 0 and day == 0:
return None
if not leap_year(year):
return datetime.datetime(year,1,1)+datetime.timedelta(day)
else:
return datetime.datetime(year,1,1)+datetime.timedelta(day-1)
def set_date(self, value=datetime.datetime.now()):
"""Set the header's date from a datetime.datetime instance.
Parameters
----------
value : datetime.datetime instance or none to use the current time
Example
-------
>>> t = datetime.datetime(2008,3,19)
>>> h.date = t
>>> h.date
datetime.datetime(2008, 3, 19, 0, 0)
"""
delta = value - datetime.datetime(value.year,1,1)
if not leap_year(value.year):
core.las.LASHeader_SetCreationDOY(self.handle, delta.days)
else:
core.las.LASHeader_SetCreationDOY(self.handle, delta.days + 1)
core.las.LASHeader_SetCreationYear(self.handle, value.year)
date = property(get_date, set_date)
def get_headersize(self):
"""Return the size of the header block of the LAS file in bytes.
Should not be needed in Python land
"""
return core.las.LASHeader_GetHeaderSize(self.handle)
header_size = property(get_headersize)
def get_dataoffset(self):
"""Returns the location in bytes of where the data block of the LAS file starts"""
return core.las.LASHeader_GetDataOffset(self.handle)
def set_dataoffset(self, value):
"""Sets the data offset
Any space between this value and the end of the VLRs will be written with 0's
"""
return core.las.LASHeader_SetDataOffset(self.handle, value)
data_offset = property(get_dataoffset, set_dataoffset)
def get_recordscount(self):
"""Returns the number of user-defined header records in the header.
User-defined records are not really supported at this time in libLAS"""
return core.las.LASHeader_GetRecordsCount(self.handle)
records_count = property(get_recordscount)
def get_dataformatid(self):
"""Gets the point format value
A value of 1 means the format is 1.1 compatible and includes a time
value on the points. A value of 0 means the format is 1.0 compatible.
"""
return core.las.LASHeader_GetDataFormatId(self.handle)
def set_dataformatid(self, value):
"""Sets the point format value
It can be 3, 2, 1, or 0.
"""
if value not in [3, 2,1,0]:
raise core.LASException("Format ID must be 3, 2, 1, or 0")
return core.las.LASHeader_SetDataFormatId(self.handle, value)
dataformat_id = property(get_dataformatid, set_dataformatid)
def get_datarecordlength(self):
return core.las.LASHeader_GetDataRecordLength(self.handle)
data_record_length = property(get_datarecordlength)
def get_pointrecordscount(self):
"""Returns the expected number of point records in the file.
Note that this value can be grossly out of sync with the
actual number of points in the file. Do not depend on it for
anything significant (like picking iteration locations in the file :)
"""
return core.las.LASHeader_GetPointRecordsCount(self.handle)
def set_pointrecordscount(self, value):
"""Sets the number of point records expected in the file"""
return core.las.LASHeader_SetPointRecordsCount(self.handle, value)
point_records_count = property(get_pointrecordscount, set_pointrecordscount)
def get_pointrecordsbyreturncount(self):
"""Gets the histogram of point records by return number for returns 0...8
Example
-------
>>> h.point_return_count
[0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L]
"""
output = []
for i in range(8):
output.append(core.las.LASHeader_GetPointRecordsByReturnCount(self.handle, i))
return output
def set_pointrecordsbyreturncount(self, value):
"""Sets the histogram of point records by return number from a list of returns 0..8
Example
-------
>>> h.point_return_count = [1341235L, 3412341222L, 0L, 0L, 4321L, 0L, 0L, 0L]
>>> h.point_return_count
[1341235L, 3412341222L, 0L, 0L, 4321L, 0L, 0L, 0L]
"""
for i in value[0:7]:
core.las.LASHeader_SetPointRecordsByReturnCount(self.handle, value.index(i), i)
point_return_count = property(get_pointrecordsbyreturncount, set_pointrecordsbyreturncount)
def get_scale(self):
"""Gets the scale factors in [x, y, z] for the point data.
libLAS uses this header value when reading/writing raw point data to the file.
If you change it in the middle of writing data, expect the unexpected.
Example
-------
>>> h.scale
[0.01, 0.01, 0.01]
"""
x = core.las.LASHeader_GetScaleX(self.handle)
y = core.las.LASHeader_GetScaleY(self.handle)
z = core.las.LASHeader_GetScaleZ(self.handle)
return [x,y,z]
def set_scale(self, value):
"""Sets the scale factors in [x, y, z] for the point data.
Example
-------
>>> h.scale = [0.5, 0.5, 0.001]
>>> h.scale
[0.5, 0.5, 0.001]
"""
return core.las.LASHeader_SetScale(self.handle, value[0], value[1], value[2])
scale = property(get_scale, set_scale)
def get_offset(self):
"""Gets the offset factors in [x, y, z] for the point data.
libLAS uses this header value when reading/writing raw point data to the file.
If you change it in the middle of writing data, expect the unexpected.
Example
-------
>>> h.offset
[0.0, 0.0, 0.0]
"""
x = core.las.LASHeader_GetOffsetX(self.handle)
y = core.las.LASHeader_GetOffsetY(self.handle)
z = core.las.LASHeader_GetOffsetZ(self.handle)
return [x,y,z]
def set_offset(self, value):
"""Sets the offset factors in [x, y, z] for the point data.
Example
-------
>>> h.offset = [32, 32, 256]
>>> h.offset
[32.0, 32.0, 256.0]
"""
return core.las.LASHeader_SetOffset(self.handle, value[0], value[1], value[2])
offset = property(get_offset, set_offset)
def get_min(self):
"""Gets the minimum values of [x, y, z] for the data.
Example
-------
>>> h.min
[0.0, 0.0, 0.0]
"""
x = core.las.LASHeader_GetMinX(self.handle)
y = core.las.LASHeader_GetMinY(self.handle)
z = core.las.LASHeader_GetMinZ(self.handle)
return [x,y,z]
def set_min(self, value):
"""Sets the minimum values of [x, y, z] for the data.
Example
-------
>>> h.min = [33452344.2333, 523442.344, -90.993]
>>> h.min
[33452344.2333, 523442.34399999998, -90.992999999999995]
"""
return core.las.LASHeader_SetMin(self.handle, value[0], value[1], value[2])
min = property(get_min, set_min)
def get_max(self):
x = core.las.LASHeader_GetMaxX(self.handle)
y = core.las.LASHeader_GetMaxY(self.handle)
z = core.las.LASHeader_GetMaxZ(self.handle)
return [x,y,z]
def set_max(self, value):
"""Sets the maximum values of [x, y, z] for the data.
Example
-------
>>> h.max = [33452344.2333, 523442.344, -90.993]
>>> h.max
[33452344.2333, 523442.34399999998, -90.992999999999995]
"""
return core.las.LASHeader_SetMax(self.handle, value[0], value[1], value[2])
max = property(get_max, set_max)
def GetVLR(self, value):
return vlr.VLR(handle=core.las.LASHeader_GetVLR(self.handle, value))
def DeleteVLR(self, value):
core.las.LASHeader_DeleteVLR(self.handle, value)
def get_srs(self):
return srs.SRS(handle=core.las.LASHeader_GetSRS(self.handle))
def set_srs(self, value):
return core.las.LASHeader_SetSRS(self.handle, value.handle)
srs = property(get_srs, set_srs)
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