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from liblas import file
from liblas import point
import sys
import getopt
def extract_classifications(infile, outfile, classifications):
inp = file.File(infile, mode='r')
header = inp.header
output = file.File(outfile, mode='w', header=header)
cnt = 0
for p in inp:
cls = p.classification
if int(cls) in classifications:
output.write(p)
cnt += 1 # keep a new count
inp.close()
output.close()
del inp
del output
# overwrite our header with our point count
header.point_records_count = cnt
output = file.File(outfile, mode='w+', header=header)
output.close()
del output
print 'wrote %d points' % cnt
def usage():
print "grab_classes.py"
print "\n"
print "--input input.las - Input file name"
print "--output output.las - Output file name"
print "--classifications 0,1,2,11 - The classifications to keep "
sys.exit(2)
def main():
infile = None
outfile = None
classifications = None
try:
opts, args = getopt.getopt(sys.argv[1:],
"i:o:c:",
["input=","output=","classifications="])
except getopt.GetoptError, err:
print str(err)
usage()
sys.exit(2)
for o, a in opts:
print o, a
if o in ["-i", "--input"]:
infile = a
if o in ["-o", "--output"]:
outfile = a
if o in ["-c", "--classifications"]:
try:
classifications = [int(i) for i in a.split(',')]
except:
classifications = int(a)
if not infile or not outfile:
usage()
print 'Input: ', infile
print 'Output: ', outfile
print 'Classifications to fetch: ', classifications
extract_classifications(infile, outfile, classifications)
if __name__ == "__main__":
main()
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