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.TH pkfilterdem 1 "06 December 2020" "" ""
.SH NAME
pkfilterdem \- Filter digital elevation model raster datasets
.SH SYNOPSIS
'nh
.fi
.ad l
\fBpkfilterdem\fR \kx
.if (\nx>(\n(.l/2)) .nr x (\n(.l/5)
'in \n(.iu+\nxu
\fB-i\fR \fIinput\fR \fB-o\fR \fIoutput\fR [\fIoptions\fR] [\fIadvanced options\fR]
'in \n(.iu-\nxu
.ad b
'hy
.SH DESCRIPTION
\fBpkfilterdem\fR can be used to filter digital elevation
models.
It is typically used after the utility
\fBpklas2img\fR(1)
to create a digital terrain model.
The default filter operation is the
.URL http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=1202973&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D1202973 "progressive morphological filter"
\&.
.SH OPTIONS
.TP 
\*(T<\fB\-i\fR\*(T> \fIfilename\fR, \*(T<\fB\-\-input\fR\*(T> \fIfilename\fR
input image
.TP 
\*(T<\fB\-o\fR\*(T> \fIfilename\fR, \*(T<\fB\-\-output\fR\*(T> \fIfilename\fR
output classification image
.TP 
\*(T<\fB\-f\fR\*(T> \fIfilter\fR, \*(T<\fB\-\-filter\fR\*(T> \fIfilter\fR
post processing filter: vito, etew_min, promorph
(progressive morphological filter), open, close).
.TP 
\*(T<\fB\-dim\fR\*(T> \fImaxsize\fR, \*(T<\fB\-\-dim\fR\*(T> \fImaxsize\fR
maximum filter kernel size
.TP 
\*(T<\fB\-ot\fR\*(T> \fItype\fR, \*(T<\fB\-\-otype\fR\*(T> \fItype\fR
Data type for output image
({Byte / Int16 / UInt16 / UInt32 / Int32 / Float32 / Float64 / CInt16 / CInt32 / CFloat32 / CFloat64}).
Empty string: inherit type from input image 
.TP 
\*(T<\fB\-of\fR\*(T> \fIformat\fR, \*(T<\fB\-\-oformat\fR\*(T> \fIformat\fR
Output image format (see also
\fBgdal_translate\fR(1)).
.TP 
\*(T<\fB\-ct\fR\*(T> \fIcolortable\fR, \*(T<\fB\-\-ct\fR\*(T> \fIcolortable\fR
color table (file with 5 columns:
id R G B ALFA (0: transparent, 255: solid)).
Use none to omit color table 
.TP 
\*(T<\fB\-nodata\fR\*(T> \fIvalue\fR, \*(T<\fB\-\-nodata\fR\*(T> \fIvalue\fR
nodata value
.TP 
\*(T<\fB\-v\fR\*(T> \fIlevel\fR, \*(T<\fB\-\-verbose\fR\*(T> \fIlevel\fR
verbose mode if > 0
.PP
Advanced options
.TP 
\*(T<\fB\-circ\fR\*(T>, \*(T<\fB\-\-circular\fR\*(T>
circular disc kernel for dilation and erosion
.TP 
\*(T<\fB\-st\fR\*(T> \fIthreshold\fR, \*(T<\fB\-\-st\fR\*(T> \fIthreshold\fR
slope threshold used for morphological filtering.
Use a low values to remove more height objects in flat terrains
.TP 
\*(T<\fB\-ht\fR\*(T> \fIthreshold\fR, \*(T<\fB\-\-ht\fR\*(T> \fIthreshold\fR
initial height threshold for progressive morphological filtering.
Use low values to remove more height objects.
Optionally, a maximum height threshold can be set via a second
argument (e.g., \*(T<\fB\-ht\fR\*(T> \fI0.2\fR
\*(T<\fB\-ht\fR\*(T> \fI2.5\fR sets an initial
threshold at 0.2 m and caps the threshold at 2.5 m).
.TP 
\*(T<\fB\-minchange\fR\*(T> \fInumber\fR, \*(T<\fB\-\-minchange\fR\*(T> \fInumber\fR
Stop iterations when no more pixels are changed than this threshold.
.SH "SEE ALSO"
\fBpklas2img\fR(1)