man/man1/gendaymtx.1

.\" RCSid $Id: gendaymtx.1,v 1.3 2013/02/05 19:31:40 greg Exp $
.TH GENDAYMTX 1 01/19/13 RADIANCE
.SH NAME
gendaymtx - generate an annual Perez sky matrix from a weather tape
.SH SYNOPSIS
.B gendaymtx
[
.B "\-v"
][
.B "\-d|\-s"
][
.B "\-r deg"
][
.B "\-m N"
][
.B "\-g r g b"
][
.B "\-c r g b"
][
.B "-o{f|d}"
][
.B "-O{0|1}"
]
[
.B "tape.wea"
]
.SH DESCRIPTION
.I Gendaymtx
takes a weather tape as input and produces a matrix of sky patch
values using the Perez all-weather model.
The weather tape is assumed to be in the simple ASCII format understood
by DAYSIM, which contains a short header with the site parameters followed
by the month, day, standard time, direct normal and diffuse horizontal
irradiance values, one time step per line.
Each time step line is used to compute a column in the output matrix,
where rows correspond to sky patch positions, starting with 0 for
the ground and continuing to 145 for the zenith using the default
.I "\-m 1"
parameter setting.
.PP
Increasing the
.I \-m
parameter, typically by factors of two, yields a higher resolution
sky using the Reinhart patch subdivision.
For example, setting
.I "\-m 4"
yields a sky with 2305 patches plus one patch for the ground.
Each matrix entry is in fact three values, corresponding to
red green and blue radiance channels (watts/sr/meter^2).
Thus, an hourly weather tape for an entire year would
yield 8760x3 (26280) values per output line (row).
.PP
The
.I \-c
option may be used to specify a color for the sky.
The gray value should equal 1 for proper energy balance
The default sky color is
.I "\-c 0.960 1.004 1.118".
Similarly, the
.I \-g
option may be used to specify a ground color.
The default value is
.I "\-g 0.2 0.2 0.2"
corresponding to a 20% gray.
.PP
The
.I \-d
option may be used to produce a sun-only matrix, with no sky contributions.
Alternatively, the
.I \-s
option may be used to exclude any direct solar component from the output.
.PP
By default,
.I gendaymtx
assumes the positive Y-axis points north such that the first sky patch
is in the Y-axis direction on the horizon, the second patch is just
west of that, and so on spiraling around to the final patch near the zenith.
The
.I \-r
(or
.I \-rz)
option rotates the sky the specified number of degrees counter-clockwise
about the zenith, i.e., west of north.
This is in keeping with the effect of passing the output of
.I gensky(1)
or
.I gendaylit(1)
through
.I xform(1)
using a similar transform.
.PP
The
.I \-of
or
.I \-od
option may be used to specify binary float or double output, respectively.
This is much faster to write and to read, and is therefore preferred on
systems that support it.
(MS Windows is not one of them.)\0
The
.I \-O1
option specifies that output should be total solar radiance rather
than visible radiance.
Finally, the
.I \-v
option will enable verbose reporting, which is mostly useful for
finding out how many time steps are actually in the weather tape.
.SH EXAMPLES
Produce an uncolored Tregenza sky matrix without solar direct:
.IP "" .2i
gendaymtx -m 1 -c 1 1 1 -s Detroit.wea > Detroit.mtx
.PP
Produce an hourly, annual Reinhart sky matrix
with 2306 patches including solar contributions
and send float output to
.I dctimestep(1)
to compute a sensor value matrix:
.IP "" .2i
gendaymtx -m 4 -of VancouverBC.wea | dctimestep -if -n 8760 DCoef.mtx > res.dat
.SH AUTHORS
Ian Ashdown wrote most of the code,
based on Jean-Jacques Delaunay's original gendaylit(1) implementation.
Greg Ward wrote the final parameter parsing and weather tape conversion.
.SH "SEE ALSO"
dctimestep(1), genBSDF(1), gendaylit(1), gensky(1), genskyvec(1), rcontrib(1),
xform(1)
Revision:	1.4
Committed:	Tue Apr 30 17:05:27 2013 UTC (12 years ago) by greg
Branch:	MAIN
Changes since 1.3:	+7 -1 lines
Log Message:	Added -O1 option to output total solar radiance
#	User	Rev	Content
1	greg	1.4	.\" RCSid $Id: gendaymtx.1,v 1.3 2013/02/05 19:31:40 greg Exp $
2	greg	1.1	.TH GENDAYMTX 1 01/19/13 RADIANCE
3			.SH NAME
4			gendaymtx - generate an annual Perez sky matrix from a weather tape
5			.SH SYNOPSIS
6			.B gendaymtx
7			[
8			.B "\-v"
9			][
10			.B "\-d\|\-s"
11			][
12	greg	1.2	.B "\-r deg"
13			][
14	greg	1.1	.B "\-m N"
15			][
16			.B "\-g r g b"
17			][
18			.B "\-c r g b"
19			][
20			.B "-o{f\|d}"
21	greg	1.4	][
22			.B "-O{0\|1}"
23	greg	1.1	]
24			[
25			.B "tape.wea"
26			]
27			.SH DESCRIPTION
28			.I Gendaymtx
29			takes a weather tape as input and produces a matrix of sky patch
30			values using the Perez all-weather model.
31			The weather tape is assumed to be in the simple ASCII format understood
32			by DAYSIM, which contains a short header with the site parameters followed
33			by the month, day, standard time, direct normal and diffuse horizontal
34			irradiance values, one time step per line.
35			Each time step line is used to compute a column in the output matrix,
36			where rows correspond to sky patch positions, starting with 0 for
37			the ground and continuing to 145 for the zenith using the default
38			.I "\-m 1"
39			parameter setting.
40			.PP
41			Increasing the
42			.I \-m
43			parameter, typically by factors of two, yields a higher resolution
44			sky using the Reinhart patch subdivision.
45			For example, setting
46			.I "\-m 4"
47			yields a sky with 2305 patches plus one patch for the ground.
48			Each matrix entry is in fact three values, corresponding to
49			red green and blue radiance channels (watts/sr/meter^2).
50			Thus, an hourly weather tape for an entire year would
51			yield 8760x3 (26280) values per output line (row).
52			.PP
53			The
54			.I \-c
55			option may be used to specify a color for the sky.
56			The gray value should equal 1 for proper energy balance
57			The default sky color is
58			.I "\-c 0.960 1.004 1.118".
59			Similarly, the
60			.I \-g
61			option may be used to specify a ground color.
62			The default value is
63			.I "\-g 0.2 0.2 0.2"
64			corresponding to a 20% gray.
65			.PP
66			The
67			.I \-d
68			option may be used to produce a sun-only matrix, with no sky contributions.
69			Alternatively, the
70			.I \-s
71			option may be used to exclude any direct solar component from the output.
72			.PP
73	greg	1.3	By default,
74			.I gendaymtx
75			assumes the positive Y-axis points north such that the first sky patch
76			is in the Y-axis direction on the horizon, the second patch is just
77			west of that, and so on spiraling around to the final patch near the zenith.
78	greg	1.1	The
79	greg	1.2	.I \-r
80			(or
81			.I \-rz)
82			option rotates the sky the specified number of degrees counter-clockwise
83	greg	1.3	about the zenith, i.e., west of north.
84	greg	1.2	This is in keeping with the effect of passing the output of
85			.I gensky(1)
86			or
87			.I gendaylit(1)
88			through
89			.I xform(1)
90			using a similar transform.
91			.PP
92			The
93	greg	1.1	.I \-of
94			or
95			.I \-od
96			option may be used to specify binary float or double output, respectively.
97			This is much faster to write and to read, and is therefore preferred on
98			systems that support it.
99			(MS Windows is not one of them.)\0
100	greg	1.4	The
101			.I \-O1
102			option specifies that output should be total solar radiance rather
103			than visible radiance.
104	greg	1.1	Finally, the
105			.I \-v
106			option will enable verbose reporting, which is mostly useful for
107			finding out how many time steps are actually in the weather tape.
108			.SH EXAMPLES
109			Produce an uncolored Tregenza sky matrix without solar direct:
110			.IP "" .2i
111			gendaymtx -m 1 -c 1 1 1 -s Detroit.wea > Detroit.mtx
112			.PP
113			Produce an hourly, annual Reinhart sky matrix
114			with 2306 patches including solar contributions
115			and send float output to
116			.I dctimestep(1)
117			to compute a sensor value matrix:
118			.IP "" .2i
119			gendaymtx -m 4 -of VancouverBC.wea \| dctimestep -if -n 8760 DCoef.mtx > res.dat
120			.SH AUTHORS
121			Ian Ashdown wrote most of the code,
122			based on Jean-Jacques Delaunay's original gendaylit(1) implementation.
123			Greg Ward wrote the final parameter parsing and weather tape conversion.
124			.SH "SEE ALSO"
125	greg	1.2	dctimestep(1), genBSDF(1), gendaylit(1), gensky(1), genskyvec(1), rcontrib(1),
126			xform(1)