v.lidar.growing - Building contour determination and Region Growing algorithm for determining the building inside
KEYWORDS
vector, LIDAR
SYNOPSIS
v.lidar.growing v.lidar.growing help v.lidar.growinginput=nameoutput=namefirst=name [database=string] [driver=string] [tj=float] [td=float] [--overwrite]
Flags:
--overwrite
Force overwrite of output files
Parameters:
input=name
Name of input vector map
output=name
Name for output vector map
first=name
Name of the first pulse vector map
database=string
Database name - THIS OPTION WILL BE REMOVED SOON
driver=string
Driver name - THIS OPTION WILL BE REMOVED SOON
Options: sqlite,ogr,pg,odbc,dbf,mysql
tj=float
Threshold for cell object frequency in region growing
Default: 0.2
td=float
Threshold for double pulse in region growing
Default: 0.6
DESCRIPTION
v.lidar.growing is the second of three step to filter LIDAR
data. It identifies which is the internal area of every object on a
LIDAR point surface. The input data is the output result of the
v.lidar.correction module. It is based on the hypothesis that
inside the object the heights are, in general, higher than on the
contour. The output will be a vector map which points are
pre-classified as TERRAIN SINGLE PULSE, TERRAIN DOUBLE PULSE, OBJECT
SINGLE PULSE or OBJECT DOUBLE PULSE. The input of this module should
be the output of v.lidar.edgedetection module, and the output
of this module will be the input of v.lidar.correction
module.
NOTES
The final result of the whole procedure (v.lidar.edgedetection,
v.lidar.growing, v.lidar.correction) will be a point classification in
four categories:
TERRAIN SINGLE PULSE
TERRAIN DOUBLE PULSE
OBJECT SINGLE PULSE
OBJECT DOUBLE PULSE
Original version of program in GRASS 5.4:
Maria Antonia Brovelli, Massimiliano Cannata, Ulisse Longoni and Mirko Reguzzoni
Update for GRASS 6.X:
Roberto Antolin and Gonzalo Moreno
REFERENCES
Brovelli M. A., Cannata M., and Longoni U.M., 2004, LIDAR Data Filtering and DTM Interpolation Within GRASS, Transactions in GIS, April 2004, vol. 8, iss. 2, pp. 155-174(20), Blackwell Publishing Ltd
Brovelli M. A. and Cannata M., 2004, Digital Terrain model reconstruction in urban areas from airborne laser scanning data: the method and an example for Pavia (Northern Italy). Computers and Geosciences 30, pp.325-331
Brovelli M. A e Longoni U.M., 2003, Software per il filtraggio di dati LIDAR, Rivista dell'Agenzia del Territorio, n. 3-2003, pp. 11-22 (ISSN 1593-2192)
Brovelli M. A., Cannata M. and Longoni U.M., 2002, DTM LIDAR in area urbana, Bollettino SIFET N.2, 2002, pp. 7-26