Installing the CREW software package
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o->create_level_c, overpass<br> | o->create_level_c, overpass<br> | ||
</code> | </code> | ||
| - | where overpass is the integer number of the Atrain overpass, see [[CREW_Data_Set]]. | + | where overpass is the integer number of the Atrain overpass, see [[CREW_Data_Set| CREW Data Set]]. |
Revision as of 09:01, 21 February 2014
Within the CREW project a software package was developed for the inter-comparison and validation against CALIOP, CPR and AMSR-E data. The software package currently has a beta version status. We would like to invite every user to give us feedback to improve the software package. The functionality of the CREW software package includes:
- displaying cloud properties on the SEVIRI disk or other user specified areas
- histograms
- latitudinal means
- plotting cloud property against viewing zenith angle
- scatter plots (SEVIRI algorithm A against SEVIRI algorithm B)
- scatter plots (SEVIRI algorithm against CALIOP/CPR/AMSR-E)
- multi algorithms ensemble means and standard devations
- ISCCP type plots (frequency distribution in dependence of cloud optical thickness and cloud top pressure)
- cross section plots along the ATRAIN tracks
- Taylor diagrams
Several steps have to be completed before you can use the CREW software package if you like to intercompare SEVIRI retrievals:
1. Send us an email in order to register for the CREW project
2. Download and unpack the CREW software package
3. Download and unpack the CREW common database
4. Adjust a few startup files
If you like to compare SEVIRI against Atrain sensors, following packages has to be installed additionally:
5. Contact EUMETSAT (Phil Watts) for downloading the AVACS software
6. Create a database of reference datasets
7. Use the CREW and AVACS software package in combination
Installation procedure for SEVIRI dataset inter-comparison
1. Registration at ICARE
Please send us an email to register at the ICARE service.
2. Download the CREW software
Go to a folder, where you would like to install the CREW software (4.4MB).
Download an unpack the CREW software package crewsoftware.tar.gz
unpack the software archive (for Linux use tar -xzf crewsoftware.tar.gz, for windows use some kind of zip software)
3. Download the CREW SEVIRI database in common format
Go to a folder, where you have place to store a large SEVIRI dataset (8.7GB).
Download an unpack the CREW software package DATA_CREW3_common.tar.gz
unpack the software archive (for Linux use tar -xzf DATA_CREW3_common.tar.gz, for windows use some kind of zip software)
4. Adjust some files
4.1 Add a idl start_up file to your <homedir>/.bashrc
# set IDL startup file
export IDL_STARTUP=${HOME}/.idl/idl_startup.pro
4.2 Modify (or create) your idl_startup file ${HOME}/.idl/idl_startup.pro
!PATH=!PATH+":<path to crewsoftware>/cws3/trunk/tools/"
!PATH=!PATH+":<path to crewsoftware>/cws3/trunk/tools/subtools/"
!PATH=!PATH+":<path to crewsoftware>/cws3/trunk/tools/subtools/msg/"
where <path to crewsoftware> is the absolute path to the directory where you save the CREW software.
4.3 Add some more lines in your idl_startup file
DEFSYSV, '!PROJECTS', { $
cws_path: '<path to crewsoftware>/cws3/trunk/', $
cws_archive: '<path to SEVIRI database in common format>/'}
5. Create your first image
Start idl from your command line and type following commands:
o=obj_new('cws_read')
o->set_date,2008,6,13,12,00
o->set_product,'ctt'
o->set_group,'AWG'
array = o->get_data()
view2d,array,/cool,/colo,no_data_idx=where(array le 0)
obj_destroy, o
or try another interactive example or some more advanced example
Installation procedure for comparing SEVIRI with ATRAIN measurements
Now you completed everything for inter-comparison of SEVIRI cloud retrievals from the common database. The CREW software in combination with the AVACS software has the functionality to compare the SEVIRI cloud retrievals with data sets of the ATRAIN satellite constellation. Therefore, you have to install also the AVACS software.
6. Get the AVACS software
Contact Phil Watts (EUMETSAT) for access to the AVACS software.
7. Download the dataset for AVACS
Go to a folder, where you have place to store a large AVACS dataset for CREW, e.g. AVACS_data.
We splitted the data into three packages:
- levB.tar.bz2 (4.3 GB compressed / 8.3 GB extracted, Atrain data regridded to the SEVIRI grid)
- levC.tar.bz2 (2.0 MB compressed / 14MB extracted, the CREW SEVIRI datasets along the Atrain track)
- levS.tar.bz2 [optional] (76 GB compressed/ 139GB extracted, original CALIOP, CPR, and AMSR-E data files)
You can start downloading and unpacking levB and levC only.
Untar the files with tar -jxf filename.
(If you like to update the original satellite data and/or do another regridding, you can download levS and have a look at the folder structure.) After downloading all datasets the folder structure should look like this:
AVACS_data/levB/
AVACS_data/levC/
AVACS_data/levS/ [optional]
8. Installation of the AVACS software
In AVACS/version-x.y/DOCS there is a handbook for user. Follow the installation instruction in section 2 and 3.
9. Updating of the level B files [optional]
If there are new datasets available from CALIOP, CPR, AMSR-E or another validation dataset you may want to update the AVACS level B files.
First you should have a look at the AVACS manual, how the files have to be stored within the AVACS levS folder. You can also download the levS.tar.bz2 files that contains the most recent version (status December 2013) of the validation data. Please have a look at the AVACS manual how to update level B files.
10. Updating of the level C files [optional]
In step 7 you downloaded ready-to-use level C files containing the data of the CREW SEVIRI algorithm along the ATRAIN track. If you update an SEVIRI dataset, you have to recreate the level C files.
o=obj_new('cws2')
where overpass is the integer number of the Atrain overpass, see CREW Data Set.
overpass=11317
o->create_level_c, overpass
