[Met_help] [rt.rap.ucar.edu #75962] History for evaluation WRF precipitation with TRMM data by using MET5.1
John Halley Gotway via RT
met_help at ucar.edu
Fri Apr 22 15:07:26 MDT 2016
----------------------------------------------------------------
Initial Request
----------------------------------------------------------------
Dear Met Helpers,
I want to evaluate WRF 3-hourly accumulated precipitation with TRMM by
using MET5.1.
Now what I have done is:
1. I have convert WRF precipitation into hourly files by using UPP3.0.
[image: 内嵌图片 1]
2. I have also convert TRMM3b42.V7 3-hourly data from binary to netcdf
MET can read by using script trmmbin2nc.R.
[image: 内嵌图片 2]
Now I am guessing I need to do following process:
1. I need to use pcp_combine with '-subtract' option to derive 3-hourly
model data. But I don't know how to write the definite command, especially
I have many accumulated precipitation at different time points. And I also
want to know whether I should regrid the model data before using
pcp_combine. If I have to, how to regrid it.
2. Then I should use Grid-Stat to compare model data with trmm data
using regrid at same time. I am also wondering, how to combine these
multi-time data to one data. Then I can run Grid-Stat just once rather than
at different times for example 00z, 03z, 06z 09z.
Sorry for so many questions. I would very appreciate it if you could
provide to me the information. Thank you very much.
Best regards,
Sincerely,
zhen
--------
LIU Zhen
Institute of Space and Earth Information Science
Fok Ying Tung Remote Sensing Science Building
The Chinese University of Hong Kong
Shatin, Hong Kong
Email: liuzhen at link.cuhk.edu.hk
----------------------------------------------------------------
Complete Ticket History
----------------------------------------------------------------
Subject: evaluation WRF precipitation with TRMM data by using MET5.1
From: John Halley Gotway
Time: Mon Apr 18 10:41:39 2016
Hello Zhen,
I see that you'd like to use the Grid-Stat to compare WRF precip to
TRMM
data. I'm glad to see that you've successfully run both UPP and the
trmmbin2nc.R script.
For accumulation intervals...
You are correct that you need to make the accumulation intervals match
before comparing them in Grid-Stat. I read that you have 3-houlry
TRMM
data and a runtime accumulation for WRF. The pcp_combine tool can be
used
to add and subtract data. You should decide what accumulation
interval
you'd like to evaluate. Any multiple of 3-hours would work.
Assuming you'd like to evaluate 3-hourly precip, you'd just run the
pcp_combine on the WRF runtime accumulation to compute differences.
Running many commands by hand would be very slow. Instead, we usually
write a script to loop over many times and call pcp_combine for each
time.
Assuming your WRF files are named "WRFPRS_d01.HH", where HH is the
forecast
hour, you'd call pcp_combine like this:
pcp_combine -subtract WRFPRS_d01.24 24 WRFPRS_d01.21 21
WRFPCP_21_24.nc
That tells pcp_combine to find the 24-hour accumulated precip from the
first file and 21-hour accumulated precip from the second file and
subtract
them. It'll write the output to a NetCDF file that I named
"WRFPCP_21_24.nc".
For regridding...
The easiest way is to just pass your WRF and TRMM data to grid_stat
and use
the automated regridding feature in met-5.1 The "regrid" section in
the
config file specifies the grid on which you want the verification
performed. Setting "to_grid = FCST" tells it to regrid the TRMM data
to
your WRF domain. Setting "to_grid = OBS" tells it to regrid the WRF
data
to the TRMM domain. It's up to you to decide the grid for computing
statistics. Please note that when regridding precipitation, it's
generally
recommended to use the BUDGET interpolation option.
You could also use the copygb utility to regrid the GRIB output of UPP
if
you'd like. And the trmmbin2nc.R script has a section at the top to
specify the output sub-grid. Those are a couple of other options
related
to regridding. But you don't need them if you use MET's automated
regridding.
As for scripting...
As I mentioned above, we always just loop through the output times in
a
script and call grid-stat once for each output time. That's much
easier
than trying to combine all output times into a single file.
Hope that helps.
Thanks,
John Halley Gotway
met_help at ucar.edu
On Sun, Apr 17, 2016 at 8:46 AM, Zhen LIU via RT <met_help at ucar.edu>
wrote:
>
> Sun Apr 17 08:46:05 2016: Request 75962 was acted upon.
> Transaction: Ticket created by liuzhen at link.cuhk.edu.hk
> Queue: met_help
> Subject: evaluation WRF precipitation with TRMM data by using
MET5.1
> Owner: Nobody
> Requestors: liuzhen at link.cuhk.edu.hk
> Status: new
> Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=75962 >
>
>
> Dear Met Helpers,
>
> I want to evaluate WRF 3-hourly accumulated precipitation with
TRMM by
> using MET5.1.
>
> Now what I have done is:
> 1. I have convert WRF precipitation into hourly files by using
UPP3.0.
> [image: 内嵌图片 1]
> 2. I have also convert TRMM3b42.V7 3-hourly data from binary to
netcdf
> MET can read by using script trmmbin2nc.R.
> [image: 内嵌图片 2]
> Now I am guessing I need to do following process:
> 1. I need to use pcp_combine with '-subtract' option to derive
3-hourly
> model data. But I don't know how to write the definite command,
especially
> I have many accumulated precipitation at different time points. And
I also
> want to know whether I should regrid the model data before using
> pcp_combine. If I have to, how to regrid it.
> 2. Then I should use Grid-Stat to compare model data with trmm
data
> using regrid at same time. I am also wondering, how to combine these
> multi-time data to one data. Then I can run Grid-Stat just once
rather than
> at different times for example 00z, 03z, 06z 09z.
>
> Sorry for so many questions. I would very appreciate it if you
could
> provide to me the information. Thank you very much.
>
> Best regards,
> Sincerely,
>
> zhen
>
> --------
>
> LIU Zhen
> Institute of Space and Earth Information Science
> Fok Ying Tung Remote Sensing Science Building
> The Chinese University of Hong Kong
> Shatin, Hong Kong
> Email: liuzhen at link.cuhk.edu.hk
>
>
------------------------------------------------
Subject: evaluation WRF precipitation with TRMM data by using MET5.1
From: Zhen LIU
Time: Wed Apr 20 10:19:41 2016
Dear John,
Thank you very much for your detailed reply.
Could I ask you another question? From my recent investigation
about
MET, it seems that MET is used for short term forecast rather than
long
term simulation evaluation and sensitivity simulation (both base run
and
sensitivity run are same models).
Best regards,
Sincerely,
zhen
--------
LIU Zhen
Institute of Space and Earth Information Science
Fok Ying Tung Remote Sensing Science Building
The Chinese University of Hong Kong
Shatin, Hong Kong
Email: liuzhen at link.cuhk.edu.hk
2016-04-19 0:41 GMT+08:00 John Halley Gotway via RT
<met_help at ucar.edu>:
> Hello Zhen,
>
> I see that you'd like to use the Grid-Stat to compare WRF precip to
TRMM
> data. I'm glad to see that you've successfully run both UPP and the
> trmmbin2nc.R script.
>
> For accumulation intervals...
>
> You are correct that you need to make the accumulation intervals
match
> before comparing them in Grid-Stat. I read that you have 3-houlry
TRMM
> data and a runtime accumulation for WRF. The pcp_combine tool can
be used
> to add and subtract data. You should decide what accumulation
interval
> you'd like to evaluate. Any multiple of 3-hours would work.
>
> Assuming you'd like to evaluate 3-hourly precip, you'd just run the
> pcp_combine on the WRF runtime accumulation to compute differences.
> Running many commands by hand would be very slow. Instead, we
usually
> write a script to loop over many times and call pcp_combine for each
time.
>
> Assuming your WRF files are named "WRFPRS_d01.HH", where HH is the
forecast
> hour, you'd call pcp_combine like this:
> pcp_combine -subtract WRFPRS_d01.24 24 WRFPRS_d01.21 21
WRFPCP_21_24.nc
>
> That tells pcp_combine to find the 24-hour accumulated precip from
the
> first file and 21-hour accumulated precip from the second file and
subtract
> them. It'll write the output to a NetCDF file that I named
> "WRFPCP_21_24.nc".
>
> For regridding...
>
> The easiest way is to just pass your WRF and TRMM data to grid_stat
and use
> the automated regridding feature in met-5.1 The "regrid" section in
the
> config file specifies the grid on which you want the verification
> performed. Setting "to_grid = FCST" tells it to regrid the TRMM
data to
> your WRF domain. Setting "to_grid = OBS" tells it to regrid the WRF
data
> to the TRMM domain. It's up to you to decide the grid for computing
> statistics. Please note that when regridding precipitation, it's
generally
> recommended to use the BUDGET interpolation option.
>
> You could also use the copygb utility to regrid the GRIB output of
UPP if
> you'd like. And the trmmbin2nc.R script has a section at the top to
> specify the output sub-grid. Those are a couple of other options
related
> to regridding. But you don't need them if you use MET's automated
> regridding.
>
> As for scripting...
>
> As I mentioned above, we always just loop through the output times
in a
> script and call grid-stat once for each output time. That's much
easier
> than trying to combine all output times into a single file.
>
> Hope that helps.
>
> Thanks,
> John Halley Gotway
> met_help at ucar.edu
>
>
> On Sun, Apr 17, 2016 at 8:46 AM, Zhen LIU via RT <met_help at ucar.edu>
> wrote:
>
> >
> > Sun Apr 17 08:46:05 2016: Request 75962 was acted upon.
> > Transaction: Ticket created by liuzhen at link.cuhk.edu.hk
> > Queue: met_help
> > Subject: evaluation WRF precipitation with TRMM data by using
MET5.1
> > Owner: Nobody
> > Requestors: liuzhen at link.cuhk.edu.hk
> > Status: new
> > Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=75962 >
> >
> >
> > Dear Met Helpers,
> >
> > I want to evaluate WRF 3-hourly accumulated precipitation with
TRMM
> by
> > using MET5.1.
> >
> > Now what I have done is:
> > 1. I have convert WRF precipitation into hourly files by using
> UPP3.0.
> > [image: 内嵌图片 1]
> > 2. I have also convert TRMM3b42.V7 3-hourly data from binary
to
> netcdf
> > MET can read by using script trmmbin2nc.R.
> > [image: 内嵌图片 2]
> > Now I am guessing I need to do following process:
> > 1. I need to use pcp_combine with '-subtract' option to derive
> 3-hourly
> > model data. But I don't know how to write the definite command,
> especially
> > I have many accumulated precipitation at different time points.
And I
> also
> > want to know whether I should regrid the model data before using
> > pcp_combine. If I have to, how to regrid it.
> > 2. Then I should use Grid-Stat to compare model data with trmm
data
> > using regrid at same time. I am also wondering, how to combine
these
> > multi-time data to one data. Then I can run Grid-Stat just once
rather
> than
> > at different times for example 00z, 03z, 06z 09z.
> >
> > Sorry for so many questions. I would very appreciate it if you
could
> > provide to me the information. Thank you very much.
> >
> > Best regards,
> > Sincerely,
> >
> > zhen
> >
> > --------
> >
> > LIU Zhen
> > Institute of Space and Earth Information Science
> > Fok Ying Tung Remote Sensing Science Building
> > The Chinese University of Hong Kong
> > Shatin, Hong Kong
> > Email: liuzhen at link.cuhk.edu.hk
> >
> >
>
>
------------------------------------------------
Subject: evaluation WRF precipitation with TRMM data by using MET5.1
From: John Halley Gotway
Time: Wed Apr 20 12:15:27 2016
Zhen,
I would agree that MET is most commonly used to evaluate shorter term
(up
to about 10 day) forecasts. However, we also to use the MET tools to
evaluate the output of climate simulations. So there's really no
reason
you couldn't use it for the evaluation of longer term simulations and
sensitivity tests.
Really the limiting factor is data formats. As long as you can get
data in
a format that MET can read it should be fine.
Hope that helps.
Thanks,
John
On Wed, Apr 20, 2016 at 10:19 AM, Zhen LIU via RT <met_help at ucar.edu>
wrote:
>
> <URL: https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=75962 >
>
> Dear John,
>
> Thank you very much for your detailed reply.
>
> Could I ask you another question? From my recent investigation
about
> MET, it seems that MET is used for short term forecast rather than
long
> term simulation evaluation and sensitivity simulation (both base run
and
> sensitivity run are same models).
>
> Best regards,
> Sincerely,
>
> zhen
>
> --------
>
> LIU Zhen
> Institute of Space and Earth Information Science
> Fok Ying Tung Remote Sensing Science Building
> The Chinese University of Hong Kong
> Shatin, Hong Kong
> Email: liuzhen at link.cuhk.edu.hk
>
> 2016-04-19 0:41 GMT+08:00 John Halley Gotway via RT
<met_help at ucar.edu>:
>
> > Hello Zhen,
> >
> > I see that you'd like to use the Grid-Stat to compare WRF precip
to TRMM
> > data. I'm glad to see that you've successfully run both UPP and
the
> > trmmbin2nc.R script.
> >
> > For accumulation intervals...
> >
> > You are correct that you need to make the accumulation intervals
match
> > before comparing them in Grid-Stat. I read that you have 3-houlry
TRMM
> > data and a runtime accumulation for WRF. The pcp_combine tool can
be
> used
> > to add and subtract data. You should decide what accumulation
interval
> > you'd like to evaluate. Any multiple of 3-hours would work.
> >
> > Assuming you'd like to evaluate 3-hourly precip, you'd just run
the
> > pcp_combine on the WRF runtime accumulation to compute
differences.
> > Running many commands by hand would be very slow. Instead, we
usually
> > write a script to loop over many times and call pcp_combine for
each
> time.
> >
> > Assuming your WRF files are named "WRFPRS_d01.HH", where HH is the
> forecast
> > hour, you'd call pcp_combine like this:
> > pcp_combine -subtract WRFPRS_d01.24 24 WRFPRS_d01.21 21
> WRFPCP_21_24.nc
> >
> > That tells pcp_combine to find the 24-hour accumulated precip from
the
> > first file and 21-hour accumulated precip from the second file and
> subtract
> > them. It'll write the output to a NetCDF file that I named
> > "WRFPCP_21_24.nc".
> >
> > For regridding...
> >
> > The easiest way is to just pass your WRF and TRMM data to
grid_stat and
> use
> > the automated regridding feature in met-5.1 The "regrid" section
in the
> > config file specifies the grid on which you want the verification
> > performed. Setting "to_grid = FCST" tells it to regrid the TRMM
data to
> > your WRF domain. Setting "to_grid = OBS" tells it to regrid the
WRF data
> > to the TRMM domain. It's up to you to decide the grid for
computing
> > statistics. Please note that when regridding precipitation, it's
> generally
> > recommended to use the BUDGET interpolation option.
> >
> > You could also use the copygb utility to regrid the GRIB output of
UPP if
> > you'd like. And the trmmbin2nc.R script has a section at the top
to
> > specify the output sub-grid. Those are a couple of other options
related
> > to regridding. But you don't need them if you use MET's automated
> > regridding.
> >
> > As for scripting...
> >
> > As I mentioned above, we always just loop through the output times
in a
> > script and call grid-stat once for each output time. That's much
easier
> > than trying to combine all output times into a single file.
> >
> > Hope that helps.
> >
> > Thanks,
> > John Halley Gotway
> > met_help at ucar.edu
> >
> >
> > On Sun, Apr 17, 2016 at 8:46 AM, Zhen LIU via RT
<met_help at ucar.edu>
> > wrote:
> >
> > >
> > > Sun Apr 17 08:46:05 2016: Request 75962 was acted upon.
> > > Transaction: Ticket created by liuzhen at link.cuhk.edu.hk
> > > Queue: met_help
> > > Subject: evaluation WRF precipitation with TRMM data by
using
> MET5.1
> > > Owner: Nobody
> > > Requestors: liuzhen at link.cuhk.edu.hk
> > > Status: new
> > > Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=75962
> >
> > >
> > >
> > > Dear Met Helpers,
> > >
> > > I want to evaluate WRF 3-hourly accumulated precipitation
with TRMM
> > by
> > > using MET5.1.
> > >
> > > Now what I have done is:
> > > 1. I have convert WRF precipitation into hourly files by
using
> > UPP3.0.
> > > [image: 内嵌图片 1]
> > > 2. I have also convert TRMM3b42.V7 3-hourly data from binary
to
> > netcdf
> > > MET can read by using script trmmbin2nc.R.
> > > [image: 内嵌图片 2]
> > > Now I am guessing I need to do following process:
> > > 1. I need to use pcp_combine with '-subtract' option to
derive
> > 3-hourly
> > > model data. But I don't know how to write the definite command,
> > especially
> > > I have many accumulated precipitation at different time points.
And I
> > also
> > > want to know whether I should regrid the model data before using
> > > pcp_combine. If I have to, how to regrid it.
> > > 2. Then I should use Grid-Stat to compare model data with
trmm data
> > > using regrid at same time. I am also wondering, how to combine
these
> > > multi-time data to one data. Then I can run Grid-Stat just once
rather
> > than
> > > at different times for example 00z, 03z, 06z 09z.
> > >
> > > Sorry for so many questions. I would very appreciate it if
you
> could
> > > provide to me the information. Thank you very much.
> > >
> > > Best regards,
> > > Sincerely,
> > >
> > > zhen
> > >
> > > --------
> > >
> > > LIU Zhen
> > > Institute of Space and Earth Information Science
> > > Fok Ying Tung Remote Sensing Science Building
> > > The Chinese University of Hong Kong
> > > Shatin, Hong Kong
> > > Email: liuzhen at link.cuhk.edu.hk
> > >
> > >
> >
> >
>
>
------------------------------------------------
Subject: evaluation WRF precipitation with TRMM data by using MET5.1
From: Zhen LIU
Time: Thu Apr 21 19:30:50 2016
Dear John,
Thank you very much for your replies, which really help me a lot.
Best regards,
Sincerely,
zhen
--------
LIU Zhen
Institute of Space and Earth Information Science
Fok Ying Tung Remote Sensing Science Building
The Chinese University of Hong Kong
Shatin, Hong Kong
Email: liuzhen at link.cuhk.edu.hk
2016-04-21 2:15 GMT+08:00 John Halley Gotway via RT
<met_help at ucar.edu>:
> Zhen,
>
> I would agree that MET is most commonly used to evaluate shorter
term (up
> to about 10 day) forecasts. However, we also to use the MET tools
to
> evaluate the output of climate simulations. So there's really no
reason
> you couldn't use it for the evaluation of longer term simulations
and
> sensitivity tests.
>
> Really the limiting factor is data formats. As long as you can get
data in
> a format that MET can read it should be fine.
>
> Hope that helps.
>
> Thanks,
> John
>
> On Wed, Apr 20, 2016 at 10:19 AM, Zhen LIU via RT
<met_help at ucar.edu>
> wrote:
>
> >
> > <URL: https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=75962 >
> >
> > Dear John,
> >
> > Thank you very much for your detailed reply.
> >
> > Could I ask you another question? From my recent investigation
about
> > MET, it seems that MET is used for short term forecast rather than
long
> > term simulation evaluation and sensitivity simulation (both base
run and
> > sensitivity run are same models).
> >
> > Best regards,
> > Sincerely,
> >
> > zhen
> >
> > --------
> >
> > LIU Zhen
> > Institute of Space and Earth Information Science
> > Fok Ying Tung Remote Sensing Science Building
> > The Chinese University of Hong Kong
> > Shatin, Hong Kong
> > Email: liuzhen at link.cuhk.edu.hk
> >
> > 2016-04-19 0:41 GMT+08:00 John Halley Gotway via RT
<met_help at ucar.edu>:
> >
> > > Hello Zhen,
> > >
> > > I see that you'd like to use the Grid-Stat to compare WRF precip
to
> TRMM
> > > data. I'm glad to see that you've successfully run both UPP and
the
> > > trmmbin2nc.R script.
> > >
> > > For accumulation intervals...
> > >
> > > You are correct that you need to make the accumulation intervals
match
> > > before comparing them in Grid-Stat. I read that you have 3-
houlry TRMM
> > > data and a runtime accumulation for WRF. The pcp_combine tool
can be
> > used
> > > to add and subtract data. You should decide what accumulation
interval
> > > you'd like to evaluate. Any multiple of 3-hours would work.
> > >
> > > Assuming you'd like to evaluate 3-hourly precip, you'd just run
the
> > > pcp_combine on the WRF runtime accumulation to compute
differences.
> > > Running many commands by hand would be very slow. Instead, we
usually
> > > write a script to loop over many times and call pcp_combine for
each
> > time.
> > >
> > > Assuming your WRF files are named "WRFPRS_d01.HH", where HH is
the
> > forecast
> > > hour, you'd call pcp_combine like this:
> > > pcp_combine -subtract WRFPRS_d01.24 24 WRFPRS_d01.21 21
> > WRFPCP_21_24.nc
> > >
> > > That tells pcp_combine to find the 24-hour accumulated precip
from the
> > > first file and 21-hour accumulated precip from the second file
and
> > subtract
> > > them. It'll write the output to a NetCDF file that I named
> > > "WRFPCP_21_24.nc".
> > >
> > > For regridding...
> > >
> > > The easiest way is to just pass your WRF and TRMM data to
grid_stat and
> > use
> > > the automated regridding feature in met-5.1 The "regrid"
section in
> the
> > > config file specifies the grid on which you want the
verification
> > > performed. Setting "to_grid = FCST" tells it to regrid the TRMM
data
> to
> > > your WRF domain. Setting "to_grid = OBS" tells it to regrid the
WRF
> data
> > > to the TRMM domain. It's up to you to decide the grid for
computing
> > > statistics. Please note that when regridding precipitation,
it's
> > generally
> > > recommended to use the BUDGET interpolation option.
> > >
> > > You could also use the copygb utility to regrid the GRIB output
of UPP
> if
> > > you'd like. And the trmmbin2nc.R script has a section at the
top to
> > > specify the output sub-grid. Those are a couple of other
options
> related
> > > to regridding. But you don't need them if you use MET's
automated
> > > regridding.
> > >
> > > As for scripting...
> > >
> > > As I mentioned above, we always just loop through the output
times in a
> > > script and call grid-stat once for each output time. That's
much
> easier
> > > than trying to combine all output times into a single file.
> > >
> > > Hope that helps.
> > >
> > > Thanks,
> > > John Halley Gotway
> > > met_help at ucar.edu
> > >
> > >
> > > On Sun, Apr 17, 2016 at 8:46 AM, Zhen LIU via RT
<met_help at ucar.edu>
> > > wrote:
> > >
> > > >
> > > > Sun Apr 17 08:46:05 2016: Request 75962 was acted upon.
> > > > Transaction: Ticket created by liuzhen at link.cuhk.edu.hk
> > > > Queue: met_help
> > > > Subject: evaluation WRF precipitation with TRMM data by
using
> > MET5.1
> > > > Owner: Nobody
> > > > Requestors: liuzhen at link.cuhk.edu.hk
> > > > Status: new
> > > > Ticket <URL:
> https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=75962
> > >
> > > >
> > > >
> > > > Dear Met Helpers,
> > > >
> > > > I want to evaluate WRF 3-hourly accumulated precipitation
with
> TRMM
> > > by
> > > > using MET5.1.
> > > >
> > > > Now what I have done is:
> > > > 1. I have convert WRF precipitation into hourly files by
using
> > > UPP3.0.
> > > > [image: 内嵌图片 1]
> > > > 2. I have also convert TRMM3b42.V7 3-hourly data from
binary to
> > > netcdf
> > > > MET can read by using script trmmbin2nc.R.
> > > > [image: 内嵌图片 2]
> > > > Now I am guessing I need to do following process:
> > > > 1. I need to use pcp_combine with '-subtract' option to
derive
> > > 3-hourly
> > > > model data. But I don't know how to write the definite
command,
> > > especially
> > > > I have many accumulated precipitation at different time
points. And I
> > > also
> > > > want to know whether I should regrid the model data before
using
> > > > pcp_combine. If I have to, how to regrid it.
> > > > 2. Then I should use Grid-Stat to compare model data with
trmm
> data
> > > > using regrid at same time. I am also wondering, how to combine
these
> > > > multi-time data to one data. Then I can run Grid-Stat just
once
> rather
> > > than
> > > > at different times for example 00z, 03z, 06z 09z.
> > > >
> > > > Sorry for so many questions. I would very appreciate it if
you
> > could
> > > > provide to me the information. Thank you very much.
> > > >
> > > > Best regards,
> > > > Sincerely,
> > > >
> > > > zhen
> > > >
> > > > --------
> > > >
> > > > LIU Zhen
> > > > Institute of Space and Earth Information Science
> > > > Fok Ying Tung Remote Sensing Science Building
> > > > The Chinese University of Hong Kong
> > > > Shatin, Hong Kong
> > > > Email: liuzhen at link.cuhk.edu.hk
> > > >
> > > >
> > >
> > >
> >
> >
>
>
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