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base.py
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base.py
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import mmap
import laspy
import os
import datetime
import struct
from types import GeneratorType
import numpy as np
import copy
from distutils.version import LooseVersion
try:
import lazperf
HAVE_LAZPERF = True
except ImportError:
HAVE_LAZPERF = False
# Not used right now - but could be a handy place to centralize file modes
FILE_MODES = ["r-", "r", "rw", "w"]
try:
xrange
except NameError:
xrange = range
try:
buffer
except NameError:
buffer = memoryview
def _prepare_np_frombuffer_data(data):
# convert data according to `numpy` changes:
# https://github.com/numpy/numpy/blob/a9bb517554004cf2ce7a4be93bcbfb63ee149844/doc/source/release/1.17.0-notes.rst#do-not-lookup-__buffer__-attribute-in-numpyfrombuffer
change_data = isinstance(data, FakeMmap) and \
LooseVersion(np.version.version) >= LooseVersion('1.17.0')
return data.view if change_data else data
def read_compressed(filename):
import subprocess
laszip_names = ('laszip', 'laszip.exe', 'laszip-cli', 'laszip-cli.exe')
laszip_binary = ''
for binary in laszip_names:
in_path = [os.path.isfile(os.path.join(x, binary))for x in os.environ["PATH"].split(os.pathsep)]
if any(in_path):
laszip_binary = binary
break
else:
raise(laspy.util.LaspyException("laszip executable (%s) was not found in PATH" % ", ".join(laszip_names)))
prc=subprocess.Popen([laszip_binary, "-olas", "-stdout", "-i", filename],
stdout=subprocess.PIPE, stderr=subprocess.PIPE, bufsize=-1)
data, stderr=prc.communicate()
if prc.returncode != 0:
# What about using the logging module instead of prints?
print("Unusual return code from %s: %d" % (laszip_binary, prc.returncode))
if stderr and len(stderr)<2048:
print(stderr)
raise ValueError("Unable to read compressed file!")
return data
class FakeMmap(object):
'''
An object imitating a memory mapped file,
constructed from 'buffer like' data.
'''
def __init__(self, filename, pos=0):
data = read_compressed(filename)
self.view = memoryview(data)
self.pos = pos
# numpy needs this, unfortunately
# Note: this is a memoryview in python3. Does numpy still "need" this?
self.__buffer__ = buffer(data)
def __len__(self):
return len(self.view)
def __getitem__(self, i):
return self.view[i]
def close(self):
self.view = None
def flush(self):
pass
def seek(self, nbytes, whence=0):
if whence == 0:
self.pos = nbytes
else:
self.pos += nbytes
def read(self, nbytes):
try:
nbytes = int(nbytes)
except ValueError:
nbytes = 0
out = self.view[self.pos:self.pos+nbytes]
self.pos += nbytes
return(out)
def tell(self):
return self.pos
def size(self):
return len(self.view)
class DataProvider():
'''Provides access to the file object, the memory map, and the numpy point map.'''
def __init__(self, filename, manager):
'''Construct the data provider. _mmap refers to the memory map, and _pmap
refers to the numpy point map.'''
self.filename = filename
self.fileref = False
self._mmap = False
self._pmap = False
self._evlrmap = False
self.manager = manager
self.mode = manager.mode
# Figure out if this file is compressed
if self.mode in ("w"):
self.compressed = False
else:
try:
tmpref = open(filename, "rb")
tmpref.seek(104)
fmt = int(struct.unpack("<B", tmpref.read(1))[0])
compression_bit_7 = (fmt & 0x80) >> 7
compression_bit_6 = (fmt & 0x40) >> 6
if (not compression_bit_6 and compression_bit_7):
self.compressed = True
else:
self.compressed = False
tmpref.close()
except Exception as e:
raise laspy.util.LaspyException("Error determining compression: "
+ str(e))
def open(self, mode):
'''Open the file, catch simple problems.'''
self.fileref = open(self.filename, mode)
def get_point_map(self, informat):
'''Get point map is used to build and return a numpy frombuffer view of the mmapped data,
using a valid laspy.util.Format instance for the desired point format. This method is used
to provide access to extra_bytes even when dimensions have been explicitly defined via an
extra_bytes VLR record.'''
if type(self._mmap) == bool:
self.map()
self.pointfmt = np.dtype([("point", zip([x.name for x in informat.specs],
[x.np_fmt for x in informat.specs]))])
if not self.manager.header.version in ("1.3", "1.4"):
np_frombuffer_data = _prepare_np_frombuffer_data(self._mmap)
_pmap = np.frombuffer(np_frombuffer_data, self.pointfmt,
offset = self.manager.header.data_offset)
else:
np_frombuffer_data = _prepare_np_frombuffer_data(self._mmap)
_pmap = np.frombuffer(np_frombuffer_data, self.pointfmt,
offset = self.manager.header.data_offset,
count = self.manager.header.point_records_count)
return(_pmap)
def point_map(self):
'''Create the numpy point map based on the point format.'''
if type(self._mmap) == bool:
self.map()
if self.mode == "r-":
# Do not construct the point map in case
return
self.pointfmt = np.dtype([("point", [(str(x.name), x.np_fmt) for x in self.manager.point_format.specs])])
if self.manager.header.version not in ("1.3", "1.4"):
if self.compressed and HAVE_LAZPERF:
import lazperf
from lazperf import VLRDecompressor
vlr = self.findLASzipVLR(self.manager.header.vlrs)
if not vlr:
raise laspy.util.LaspyException("""Unable to find LASzip VLR!""")
vlr_data = np.frombuffer(vlr.VLR_body,
np.uint8,
count = vlr.rec_len_after_header)
# first 8 bytes after VLRs are laszip, then is start of data
laszip_offset = self.manager.header.data_offset + 8
np_frombuffer_data = _prepare_np_frombuffer_data(self._mmap)
points_compressed = np.frombuffer(np_frombuffer_data,
np.uint8,
offset = laszip_offset,
count = self._mmap.size() - laszip_offset)
record_length = self.manager.header.data_record_length
decompressor = lazperf.VLRDecompressor( points_compressed,
record_length,
vlr_data)
uncompressed = decompressor.decompress_points(self.manager.header.point_records_count)
# we've decompressed the points, now stick the header on the
# front and make a new mmap
np_frombuffer_data = _prepare_np_frombuffer_data(self._mmap)
header = np.frombuffer(np_frombuffer_data, np.uint8, count = self.manager.header.data_offset)
full = np.zeros(len(header) + len(uncompressed), dtype=np.uint8)
full[0:len(header)] = header
full[len(header):len(uncompressed)+len(header)] = uncompressed
self._mmap = full
np_frombuffer_data = _prepare_np_frombuffer_data(self._mmap)
self._pmap = np.frombuffer(np_frombuffer_data, self.pointfmt,
offset=self.manager.header.data_offset)
if self.manager.header.point_records_count != len(self._pmap):
if self.manager.mode == "r":
raise laspy.util.LaspyException("""Invalid Point Records Count Information Encountered in Header.
Please correct. Header.point_records_count = %i, and %i records actually detected."""%(self.manager.header.point_records_count, len(self._pmap)))
else:
print("""WARNING: laspy found invalid data in header.point_records_count.
Header.point_records_count = %i, and %i records actually detected.
Attempting to correct mismatch.""") % (self.manager.header.point_records_count, len(self._pmap))
self.manager.header.point_records_count = len(self._pmap)
else:
np_frombuffer_data = _prepare_np_frombuffer_data(self._mmap)
self._pmap = np.frombuffer(np_frombuffer_data, self.pointfmt,
offset=self.manager.header.data_offset,
count=self.manager.header.point_records_count)
def close(self, flush=True):
'''Close the data provider and flush changes if _mmap and _pmap exist.'''
if flush and self.manager.has_point_records:
try:
self._mmap.flush()
self._mmap.close()
except(Exception):
self._mmap = False
self._pmap = False
self._mmap = False
self._pmap = False
if self.fileref != False:
try:
self.fileref.close()
except(Exception):
raise laspy.util.LaspyException("Error closing file.")
def findLASzipVLR(self, vlrs):
for vlr in vlrs:
if vlr.user_id.rstrip(' \t\r\n\0') == 'laszip encoded':
if vlr.record_id == 22204:
return vlr
return None
def map(self):
'''Memory map the file'''
if self.fileref == False and not self.compressed:
raise laspy.util.LaspyException("File not opened.")
if self.mode in ("r", "r-"):
if self.compressed and self.mode != "r-" and not HAVE_LAZPERF:
self._mmap = FakeMmap(self.filename)
else:
self._mmap = mmap.mmap(self.fileref.fileno(), 0, access = mmap.ACCESS_READ)
elif self.mode in ("w", "rw"):
self._mmap = mmap.mmap(self.fileref.fileno(), 0, access = mmap.ACCESS_WRITE)
else:
raise laspy.util.LaspyException("Invalid Mode: " + str(self.mode))
def remap(self,flush = True, point_map = False):
'''Re-map the file. Flush changes, close, open, and map. Optionally point map.'''
if flush and type(self._mmap) != bool:
self._mmap.flush()
self.close(flush=False)
if self.mode in ("r", "r-"):
self.open("rb")
elif self.mode in ("w", "rw"):
self.open("r+b")
else:
raise laspy.util.LaspyException("Invalid Mode: " + str(self.mode))
self.map()
if point_map:
self.point_map()
def __getitem__(self, index):
'''Return the raw bytes corresponding to the point @ index.'''
try:
index.stop
except AttributeError:
return(self._pmap[index][0])
if index.step:
step = index.step
else:
step = 1
return([x[0] for x in self._pmap[index.start:index.stop,step]])
def __setitem__(self, key, value):
'''Assign raw bytes for point @ key'''
try:
key.stop
except AttributeError:
self._pmap[key] = (value,)
return
self._pmap[key.start:key.stop] = [(x,) for x in value]
def filesize(self):
'''Return the size ofs the current map'''
if self._mmap == False:
raise laspy.util.LaspyException("File not mapped")
return(self._mmap.size())
class FileManager(object):
'''Superclass of Reader and Writer, provides most of the data manipulation functionality in laspy.'''
def __init__(self,filename, mode, header=False, vlrs=False, evlrs=False):
'''Build the FileManager object. This is done when opening the file
as well as upon completion of file modification actions like changing the
header padding.'''
self.compressed = False
self.vlr_formats = laspy.util.Format("VLR")
self.evlr_formats = laspy.util.Format("EVLR")
self.mode = mode
self.data_provider = DataProvider(filename, self)
self.setup_memoizing()
self.calc_point_recs = False
self.point_refs = False
self._current = 0
self.padded = False
if self.mode in ("r", "r-"):
self.setup_read_write(vlrs,evlrs, read_only=True)
return
elif self.mode == "rw":
self.setup_read_write(vlrs, evlrs, read_only=False)
return
elif self.mode == "w":
self.setup_write(header, vlrs, evlrs)
return
else:
raise laspy.util.LaspyException("Mode %s not supported / implemented" % mode)
def close(self):
'''Help the garbage collector by deleting some of the circular references'''
self.data_provider.close()
self.data_provider = None
self.header = None
self._header = None
self.vlrs = None
self.evlrs = None
def setup_read_write(self, vlrs, evlrs, read_only=True):
# Check if read only mode, if not open for updating.
if read_only:
open_mode = "rb"
else:
open_mode = "r+b"
self._header_current = True
self.data_provider.open(open_mode)
self.data_provider.map()
self.header_format = laspy.util.Format("h" + self.grab_file_version())
self.get_header(self.grab_file_version())
self.populate_vlrs()
self.point_refs = False
self.has_point_records = True
self._current = 0
self.correct_rec_len()
self.compressed = self.point_format.compressed
#if self.point_format.compressed:
# self.compressed = True
# self.data_provider.remap()
#else:
# self.compressed = False
if self.mode == "r-":
self.extra_dimensions = []
self.vlrs = []
self.evlrs = []
return
self.data_provider.point_map()
if self.header.version in ("1.3", "1.4"):
#gives key error if called with buffer hack for some reason...
self.populate_evlrs()
else:
self.evlrs = []
if vlrs != False:
self.set_vlrs(vlrs)
if evlrs != False:
self.set_evlrs(vlrs)
# If extra-bytes descriptions exist in VLRs, use them.
eb_vlrs = [x for x in self.vlrs if x.type == 1]
eb_vlrs.extend([x for x in self.evlrs if x.type == 1])
self.extra_dimensions = []
if len(eb_vlrs) > 1:
raise laspy.util.LaspyException("Only one ExtraBytes VLR currently allowed.")
elif len(eb_vlrs) == 1:
self.naive_point_format = self.point_format
self.extra_dimensions = eb_vlrs[0].extra_dimensions
new_pt_fmt = laspy.util.Format(self.point_format.fmt, extradims
= self.extra_dimensions)
self.point_format = new_pt_fmt
self.data_provider.remap(point_map = True)
return
def setup_write(self,header, vlrs, evlrs):
self._header_current = False
if header == False:
raise laspy.util.LaspyException("Write mode requires a valid header object.")
## No file to store data yet.
self.has_point_records = False
self.data_provider.open("w+b")
self.header_format = header.format
self._header = header
self.header = laspy.header.HeaderManager(header = header, reader = self)
self.initialize_file_padding(vlrs)
## We have a file to store data now.
self.data_provider.remap()
self.header.flush()
self.correct_rec_len()
if not vlrs in [[], False]:
self.set_vlrs(vlrs)
else:
self.vlrs = []
if not evlrs in [[], False]:
self.set_evlrs(evlrs)
else:
self.evlrs = []
self.verify_num_vlrs()
if self._header.created_year == 0:
self.header.date = datetime.datetime.now()
self.populate_vlrs()
self.populate_evlrs()
# If extra-bytes descriptions exist in VLRs, use them.
eb_vlrs = [x for x in self.vlrs if x.type == 1]
eb_vlrs.extend([x for x in self.evlrs if x.type == 1])
self.extra_dimensions = []
if len(eb_vlrs) > 1:
raise laspy.util.LaspyException("Only one ExtraBytes VLR currently allowed.")
elif len(eb_vlrs) == 1:
self.naive_point_format = self.point_format
self.extra_dimensions = eb_vlrs[0].extra_dimensions
new_pt_fmt = laspy.util.Format(self.point_format.fmt, extradims
= self.extra_dimensions)
self.point_format = new_pt_fmt
return
def verify_num_vlrs(self):
headervlrs = self.get_header_property("num_variable_len_recs")
calc_headervlrs = len(self.vlrs)
if headervlrs != calc_headervlrs:
raise laspy.util.LaspyException('''Number of EVLRs provided does not match the number
specified in the header. (copied headers do not maintain
references to their EVLRs, that might be your problem.
You can pass them explicitly to the File constructor.)''')
if self.header.version == "1.4":
calc_headerevlrs = len(self.evlrs)
headerevlrs = self.get_header_property("num_evlrs")
if headerevlrs != calc_headerevlrs:
raise laspy.util.LaspyException('''Number of EVLRs provided does not match the number
specified in the header. (copied headers do not maintain
references to their EVLRs, that might be your problem.
You can pass them explicitly to the File constructor.)''')
def correct_rec_len(self):
extrabytes = self.header.data_record_length-laspy.util.Format(self.header.data_format_id).rec_len
if extrabytes >= 0:
self.point_format = laspy.util.Format(self.header.data_format_id,extra_bytes= extrabytes)
else:
self.point_format = laspy.util.Format(self.header.data_format_id)
self.set_header_property("data_record_length", self.point_format.rec_len)
def initialize_file_padding(self, vlrs):
filesize = self._header.format.rec_len
self._header.header_size = filesize
if vlrs != False:
filesize += sum([len(x) for x in vlrs])
self.vlr_stop = filesize
if self._header.data_offset != 0:
filesize = max(self._header.data_offset, filesize)
self._header.data_offset = filesize
self.data_provider.fileref.write(b"\x00"*filesize)
return
def setup_memoizing(self):
self.header_changes = set()
self.header_properties = {}
def populate_c_packers(self):
'''This is depricated if the numpy point map is used, because nparr.tostring() is MUCH faster.
This creates compiled Struct objects for various formats.
'''
for spec in self.point_format.specs:
self.c_packers[spec.name] = struct.Struct(spec.fmt)
self.c_packers[spec.fmt] = self.c_packers[spec.name]
def packed_str(self, string):
'''Take a little endian binary string, and convert it to a python int.'''
return(sum([int(string[idx])*(2**idx) for idx in xrange(len(string))]))
def binary_str(self, N, zerolen = 8):
'''Take a python integer and create a binary string padded to len zerolen.'''
raw_bin = bin(N)[2:][::-1]
padding = zerolen-len(raw_bin)
if padding < 0:
raise laspy.util.LaspyException("Invalid Data: Packed Length is Greater than allowed.")
return(raw_bin + '0'*(zerolen-len(raw_bin)))
def bit_transform(self, x, low, high):
return np.right_shift(np.bitwise_and(x, 2**high - 1), low)
def read(self, bytes):
'''Wrapper for mmap.mmap read function'''
return(self.data_provider._mmap.read(bytes))
def reset(self):
'''Refresh the mmap and fileref'''
self.data_provier.remap()
return
def seek(self, bytes, rel = True):
'''Wrapper for mmap.mmap seek functions, make option rel explicit'''
self._current = None
if rel:
self.data_provider._mmap.seek(bytes,1)
return
self.data_provider._mmap.seek(bytes, 0)
def read_words(self, name, rec_type = "vlr"):
'''Read a consecutive sequence of packed binary data, return a single
element or list.'''
if rec_type == "vlr":
source = self.vlr_formats
elif rec_type == "evlr":
source = self.evlr_formats
elif rec_type == "header":
source = self.header_format
else:
raise laspy.util.LaspyException("Invalid source: " + str(rec_type))
try:
dim = source.lookup[name]
except KeyError:
raise laspy.util.LaspyException("Dimension " + name + " not found.")
return(self._read_words(dim.fmt, dim.num, dim.length))
def _read_words(self, fmt, num, bytes):
'''Read a consecutive sequence of packed binary data, return a single
element or list'''
outData = []
for i in xrange(num):
dat = self.read(bytes)
try:
unpacked = struct.unpack(fmt, dat)[0]
if fmt == '<s':
struct.unpack(fmt, dat)[0]
unpacked = unpacked.decode('ascii')
except (struct.error, UnicodeDecodeError):
# this is often NULs and random data that occurs after the
# ending NUL.
unpacked = '\x00'
outData.append(unpacked)
if len(outData) > 1:
return(outData)
return(outData[0])
def _pack_words(self, fmt, num, bytes, val):
if num == 1:
return(struct.pack(fmt, val))
outData = "".join([struct.pack(fmt, val[i]) for i in xrange(num)])
return(outData)
def grab_file_version(self):
'''Manually grab file version from header'''
self.seek(24, rel = False)
v1 = self._read_words("<B", 1, 1)
v2 = self._read_words("<B", 1, 1)
self.seek(0, rel = False)
return(str(v1) +"." + str(v2))
def get_header(self, file_version = 1.2):
'''Return the header object, or create one if absent.'''
## Why is this != neccesary?
try:
return(self.header)
except:
self.header = laspy.header.HeaderManager(header = laspy.header.Header(file_version), reader = self)
return(self.header)
def populate_evlrs(self):
'''Catalogue the extended variable length records'''
self.evlrs = []
if not self.header.version in ("1.3", "1.4"):
return
if self.header.version == "1.3":
if self.header.start_wavefm_data_rec != 0:
self.seek(self.header.start_wavefm_data_rec, rel = False)
num_vlrs = 1
else:
num_vlrs = 0
elif self.header.version == "1.4":
self.seek(self.header.start_first_evlr, rel = False)
num_vlrs = self.get_header_property("num_evlrs")
for i in xrange(num_vlrs):
new_vlr = laspy.header.EVLR(None, None, None)
new_vlr.build_from_reader(self)
self.evlrs.append(new_vlr)
return
def populate_vlrs(self):
'''Catalogue the variable length records'''
self.vlrs = []
self.seek(self.header.header_size, rel = False)
for i in xrange(self.get_header_property("num_variable_len_recs")):
new_vlr = laspy.header.VLR(None, None, None)
new_vlr.build_from_reader(self)
self.vlrs.append(new_vlr)
if self.data_provider._mmap.tell() > self.header.data_offset:
self.seek(self.header.data_offset, rel = False)
raise laspy.util.LaspyException("Error, Calculated Header Data "
"Overlaps The Point Records!")
self.vlr_stop = self.data_provider._mmap.tell()
return
def get_vlrs(self):
'''Populate and return list of :obj:`laspy.header.VLR` objects`.'''
try:
return(self.vlrs)
except:
self.populate_vlrs()
return(self.vlrs)
def push_vlrs(self):
self.set_vlrs(self.vlrs)
def get_evlrs(self):
try:
return(self.evlrs)
except:
self.populate_evlrs()
return(self.evlrs)
def get_padding(self):
'''Return the padding between the end of the VLRs and the beginning of
the point records'''
return(self.header.data_offset - self.vlr_stop)
def get_pointrecordscount(self):
'''calculate the number of point records'''
return(self.get_header_property("point_records_count"))
def set_input_srs(self):
pass
def set_output_srsS(self):
pass
def get_raw_point_index(self,index):
'''Return the byte index of point number index'''
return(self.header.data_offset +
index*self.header.data_record_length)
def get_points(self):
'''Return a numpy array of all point data in a file.'''
if not self.has_point_records:
return None
# We don't need to build point_refs here (perhaps not anymore, at all)
# if type(self.point_refs) == bool:
# self.build_point_refs()
#single_fmt = self.point_format.pt_fmt_long[1:]
#fmtlen = len(single_fmt)
#big_fmt_string = "".join(["<", single_fmt*self.header.point_records_count])
#pts = unpack(big_fmt_string, self.data_provider._mmap[self.header.data_offset:self.data_provider._mmap.size()])
#return((laspy.util.Point(self, unpacked_list = pts[fmtlen*i:fmtlen*(i+1)]) for i in xrange(self.header.point_records_count)))
#return([laspy.util.Point(self,x) for x in self._get_raw_dimension(0, self.header.data_record_length)])
#return((x[0] for x in self.data_provider._pmap))
return(self.data_provider._pmap)
def get_raw_point(self, index):
'''Return the raw bytestring associated with point of number index'''
#start = (self.header.data_offset +
# index * self.header.data_record_length)
#return(self.data_provider._mmap[start : start +
# self.header.data_record_length])
return(self.data_provider._pmap[index][0].tostring())
#self, reader, startIdx ,version
def get_point(self, index, nice=False):
'''Return point object for point of number index / #legacy_api'''
if index >= self.get_pointrecordscount():
return
self._current = index
return(laspy.util.Point(self, self.get_raw_point(index), nice= nice))
def get_next_point(self):
'''Return next point object via get_point / #legacy_api'''
if self._current == None:
raise laspy.util.LaspyException("No Current Point Specified," +
" use Reader.GetPoint(0) first")
if self._current == self.get_pointrecordscount():
return
return self.get_point(self._current + 1)
def build_point_refs(self):
'''Build array of point offsets '''
# Is this really needed?
pts = int(self.get_pointrecordscount())
length = int(self.header.data_record_length)
offs = int(self.header.data_offset)
self.point_refs = [x*length + offs
for x in xrange(pts)]
return
def get_dimension(self, name):
'''Grab a point dimension by name, returning a numpy array. Refers to
reader.point_format for the required Spec instance.'''
if not self.has_point_records:
return None
#if type(self.point_refs) == bool:
# self.build_point_refs()
if type(self.data_provider._pmap) == bool:
self.data_provider.point_map()
try:
spec = self.point_format.lookup[name]
#return(self._get_dimension(spec))
return(self._get_dimension(spec))
except KeyError:
raise laspy.util.LaspyException("Dimension: " + str(name) +
" not found. Existing dimensions: " + ", ".join(self.point_format.lookup.keys()))
def _get_dimension(self, spec):
return(self.data_provider._pmap["point"][spec.name])
def _get_dimension_by_specs(self,offs, fmt, length):
'''Return point dimension of specified offset format and length'''
if type(self.point_refs) == bool:
self.build_point_refs()
_mmap = self.data_provider._mmap
prefs = (offs + x for x in self.point_refs)
packer = self.c_packers[fmt]
return((packer.unpack(_mmap[x:x+length])[0] for x in prefs))
def _get_raw_dimension(self,spec):
'''Return point dimension of specified offset format and length'''
#_mmap = self.data_provider._mmap
#prefs = (offs + x for x in self.point_refs)
#return((_mmap[start + offs : start+offs+length] for start in prefs))
return(self.data_provider._pmap["point"][spec.name].tostring())
def _get_raw_datum(self, rec_offs, spec):
'''return raw bytes associated with non dimension field (VLR/Header)'''
return(self.data_provider._mmap[(rec_offs + spec.offs):(rec_offs + spec.offs
+ spec.num*spec.length)])
def _get_datum(self, rec_offs, spec):
'''Return unpacked data assocaited with non dimension field (VLR/Header)'''
data = self._get_raw_datum(rec_offs, spec)
if spec.num == 1:
return(struct.unpack(spec.fmt, data)[0])
unpacked = map(lambda x: struct.unpack(spec.fmt,
data[x*spec.length:(x+1)*spec.length])[0], xrange(spec.num))
if spec.pack:
# return("".join([str(x[0]) for x in unpacked]))
if spec.fmt == '<s':
s = ''.join(x.decode('ascii') for x in unpacked)
return s
else:
return("".join([str(x[0]) for x in unpacked]))
else:
unpacked = list(unpacked) # evaluate the map in python3
return(unpacked)
def get_raw_header_property(self, name):
'''Wrapper for grabbing raw header bytes with _get_raw_datum'''
spec = self.header_format.lookup[name]
return(self._get_raw_datum(0, spec))
def get_header_property(self, name):
'''Wrapper for grabbing unpacked header data with _get_datum'''
if name in self.header_changes:
spec = self.header_format.lookup[name]
new_val = self._get_datum(0, spec)
self.header_properties[name] = new_val
self.header_changes.remove(name)
return(new_val)
elif name in self.header_properties:
return(self.header_properties[name])
else:
spec = self.header_format.lookup[name]
val = self._get_datum(0, spec)
self.header_properties[name] = val
return(val)
def get_x(self, scale=False):
if not scale:
return(self.get_dimension("X"))
return(self.get_dimension("X")*self.header.scale[0] + self.header.offset[0])
def get_y(self, scale=False):
if not scale:
return(self.get_dimension("Y"))
return(self.get_dimension("Y")*self.header.scale[1] + self.header.offset[1])
def get_z(self, scale=False):
if not scale:
return(self.get_dimension("Z"))
return(self.get_dimension("Z")*self.header.scale[2] + self.header.offset[2])
def get_intensity(self):
return(self.get_dimension("intensity"))
def get_flag_byte(self):
return(self.get_dimension("flag_byte"))
def get_raw_classification_flags(self):
return(self.get_dimension("classification_flags"))
def get_classification_flags(self):
if not self.header.data_format_id in (6,7,8,9,10):
return(self.get_classification())
rawDim = self.get_raw_classification_flags()
return self.bit_transform(rawDim, 0, 4)
def get_classification_byte(self):
return(self.get_dimension("classification_byte"))
def get_return_num(self):
rawDim = self.get_flag_byte()
if self.header.data_format_id in (0,1,2,3,4,5):
return self.bit_transform(rawDim, 0, 3)
elif self.header.data_format_id in (6,7,8,9,10):
return self.bit_transform(rawDim, 0, 4)
def get_num_returns(self):
rawDim = self.get_flag_byte()
if self.header.data_format_id in (0,1,2,3,4,5):
return self.bit_transform(rawDim, 3, 6)
elif self.header.data_format_id in (6,7,8,9,10):
return self.bit_transform(rawDim, 4, 8)
def get_scanner_channel(self):
rawDim = self.get_raw_classification_flags()
if not self.header.data_format_id in (6,7,8,9,10):
raise laspy.util.LaspyException("Scanner Channel not present for point format: " + str(self.header.data_format_id))
return self.bit_transform(rawDim, 4, 6)
def get_scan_dir_flag(self):
if self.header.data_format_id in (0,1,2,3,4,5):
rawDim = self.get_flag_byte()
elif self.header.data_format_id in (6,7,8,9,10):
rawDim = self.get_raw_classification_flags()
return self.bit_transform(rawDim, 6, 7)
def get_edge_flight_line(self):
if self.header.data_format_id in (0,1,2,3,4,5):
rawDim = self.get_flag_byte()
elif self.header.data_format_id in (6,7,8,9,10):
rawDim = self.get_raw_classification_flags()
return self.bit_transform(rawDim, 7, 8)
def get_raw_classification(self):
return(self.get_dimension("raw_classification"))
def get_classification(self):
if self.header.data_format_id in (0,1,2,3,4,5):
return self.bit_transform(self.get_raw_classification(), 0, 5)
elif self.header.data_format_id in (6,7,8,9,10):
return(self.get_dimension("classification_byte"))
def get_synthetic(self):
if self.header.data_format_id in (6,7,8,9,10):
return self.bit_transform(self.get_raw_classification_flags(), 0, 1)
return self.bit_transform(self.get_raw_classification(), 5, 6)
def get_key_point(self):
if self.header.data_format_id in (6,7,8,9,10):
return self.bit_transform(self.get_raw_classification_flags(), 1, 2)
return self.bit_transform(self.get_raw_classification(), 6, 7)
def get_withheld(self):
if self.header.data_format_id in (6,7,8,9,10):
return self.bit_transform(self.get_raw_classification_flags(), 2, 3)
return self.bit_transform(self.get_raw_classification(), 7, 8)
def get_overlap(self):
if self.header.data_format_id in (6,7,8,9,10):
return self.bit_transform(self.get_raw_classification_flags(), 3, 4)
else:
raise laspy.util.LaspyException("Overlap only present in point formats > 5.")
def get_scan_angle_rank(self):
return(self.get_dimension("scan_angle_rank"))
def get_scan_angle(self):
return(self.get_dimension("scan_angle"))
def get_user_data(self):
return(self.get_dimension("user_data"))
def get_pt_src_id(self):
return(self.get_dimension("pt_src_id"))
def get_gps_time(self):
return(self.get_dimension("gps_time"))
def get_red(self):
return(self.get_dimension("red"))
def get_green(self):
return(self.get_dimension("green"))
def get_blue(self):
return(self.get_dimension("blue"))
def get_nir(self):
return(self.get_dimension("nir"))
def get_wave_packet_desc_index(self):
return(self.get_dimension("wave_packet_desc_index"))
def get_byte_offset_to_waveform_data(self):
return(self.get_dimension("byte_offset_to_waveform_data"))
def get_waveform_packet_size(self):
return(self.get_dimension("waveform_packet_size"))
def get_return_point_waveform_loc(self):
return(self.get_dimension("return_point_waveform_loc"))
def get_x_t(self):
return(self.get_dimension("x_t"))
def get_y_t(self):
return(self.get_dimension("y_t"))
def get_z_t(self):
return(self.get_dimension("z_t"))
def get_extra_bytes(self):
if "extra_bytes" in self.point_format.lookup.keys():
return(self.get_dimension("extra_bytes"))
elif self.extra_dimensions != []:
newmap = self.data_provider.get_point_map(self.naive_point_format)
return(newmap["point"]["extra_bytes"])
else:
raise laspy.util.LaspyException("Extra bytes not present in record")
class Reader(FileManager):
'''Just a subclass of FileManager'''
pass
class Writer(FileManager):
def close(self, ignore_header_changes = False, minmax_mode = "scaled"):
'''Flush changes to mmap and close mmap and fileref'''
if (not ignore_header_changes) and (self.has_point_records):
if not self._header_current:
self.header.update_histogram()
self.header.update_min_max(minmax_mode)
super(Writer, self).close()
def set_evlrs(self, value):
if value == False or len(value) == 0:
return
if not all([x.isEVLR for x in value]):
raise laspy.util.LaspyException("set_evlrs requers an iterable object " +
"composed of :obj:`laspy.header.EVLR` objects.")
elif self.mode == "w+":
raise NotImplementedError
elif self.mode in ("rw", "w"):
if self.header.version == "1.3":
old_offset = self.header.start_wavefm_data_rec
elif self.header.version == "1.4":
old_offset = self.header.start_first_evlr
self.set_header_property("num_evlrs", len(value))
else:
raise laspy.util.LaspyException("Invalid File Version for EVLRs: " + str(self.header.version))
# Good we know where the EVLRs should go... but what about if we don't have point records yet?
# We can't make that decision yet, in case the user wants to subset the data.
if not self.has_point_records:
old_offset = self.header.data_offset
if self.header.version == "1.3":