MEPIX Software User Manual
Contents
1. licenses O modules E 5 beam help 4 6 E DI a e beam 4 2 SNAPSHOT bak H O blue marble worldmap 1 0 1 E 5 lib hdf 2 3 E O lib netcdf 2 2 16 5 Blue Marble Geo O Cadifra ComPlus Applications descw99 a Dev Cpp O dm j 3 Objekt e ausgew hlt Earth Explorer Mission CFI 3 6 Software H 5 Earth Explorer Mission CFI 3 7 Software 5 Earth Explorer Mission CFI Software Name i beam getasse30 reader 1 0 jar Pi beam gpf 4 6 1 jar B beam hdf5 writer 1 0 jar A beam landsat reader 1 1 2 jar La beam meris boreal lakes 1 0 2 jar Plbeam meris brr 2 0 3 SMAPSHOT jar al beam meris case2 core 1 0 jar Pi beam meris case2 regional 1 3 2 jar la beam meris cloud 1 5 102 jar B beam meris eutrophic lakes 1 0 2 jar E beam meris icol 1 2 1 jar old SS beam meris icol 1 2 SNAPSHOT jar old al beam meris icol 2 0 jar E beam meris icol 2 0 5NAPSHOT Jar old La beam merisl3 reader 1 0 100 jar Pi beam meris l2auxdata 1 0 jar Bi beam meris ndvi 1 2 102 jar B beam meris radtorefl 1 3 200 jar La beam meris smac 1 5 102 jar Bi beam meris smile 1 2 jar B beam modis reader 1 1 jar Lei beam mosaic 2 2 3 jar La beam netcdf reader 1 0 3 jar al beam obpg reader 1 0 2 jar La beam pconvert 1 3 jar A beam processing 4 6 1 jar La beam scripting 4 6 jar Lal beam ui 4 6 1 jar al beam unmix 1 0 1 jar A beam visat 4 6 1 jar la beam visat rcp 4 6 1 jar B ceres binding 0 9 jar La ceres2. If this checkbox is selected the output product will contain a band with the Di pressure derived as described in Section 3 3 3 for each pixel over ocean PScatt LISE O2 project ocean If this checkbox is selected the output product will contain a band with the PScatt pressure derived as described in Section 3 3 5 for each pixel over ocean Copyright O 2009 Brockmann Consult GmbH 14 Be MEPIX Software User Manual Version 1 1 BROCKMANN Con pap 15 December 2009 4 5 Cloud Products Tab Pane QWG mode If MEPIX is run in QWG mode an additional tab pane Cloud Products is available which provides options to write additional bands with GlobCover products Figure 4 5 team MEPIX Pixel Identification Tool MERIS 02 Project v1 1 nnn I O Parameters IPF Compatible Products Pressure Products Cloud Products C Blue Band Flags C Cloud Probability C Combined Clouds Flags Figure 4 5 Cloud Products Tab Pane QWG mode only This tab pane consists of the following components Blue Band Flags If this checkbox is selected the output product will contain a band with Blue Band flags derived for each pixel Cloud Probability If this checkbox is selected the output product will contain a band with cloud probability derived for each pixel Combined Cloud Flags If this checkbox is selected the output product will contain a band with Combined Cloud
3. LISE 02 project land P2 LISE O2 project ocean PScatt LISE O2 project ocean Figure 4 4 Pressure Products Tab Pane This tab pane consists of the following components Barometric Pressure If this checkbox is selected the output product will contain a band with the barometric pressure derived for each pixel Use GETASSE30 DEM for Barometric Pressure Computation If this checkbox is selected the barometric pressure will be computed using the GETASSE30 DEM instead of the tie point DEM Note that this option can only be used if the GETASSE30 DEM has been installed in BEAM Surface Pressure FUB O2 Project If this checkbox is selected the output product will contain a band with the surface pressure derived as described in Section 3 3 1 for each pixel Apply Tropical Atmosphere instead of USS standard in FUB algorithm If this checkbox is selected a tropical atmosphere instead of USS standard is used within the FUB surface pressure algorithm P1 LISE O2 project all surfaces If this checkbox is selected the output product will contain a band with the DU pressure derived as described in Section 3 3 2 for each pixel over each surface Surface pressure LISE O2 project land If this checkbox is selected the output product will contain a band with the surface pressure derived as described in Section 3 3 3 for each pixel over land PI LISE O2 project ocean
4. binio 0 9 jar Lal ceres core 0 9 jar al ceres glayer 0 9 jar B ceres ui 0 9 jar al flint processor 1 0 jar i x chain 1 1 jar Gr e Typ A 22KB Executable Jar File 222 KB Executable Jar File 15KB Executable Jar File 78KB Executable Jar File 830 KB Executable Jar File 47 KB Executable Jar File 50 KB Executable Jar File 822 KB Executable Jar File 154KB Executable Jar File 824 KB Executable Jar File 1 108 K6 OLD Datei 1 099KB OLD Datei 1 200KB Executable Jar File 1 200 K6 OLD Datei 17KB Executable Jar File 47 954 KB Executable Jar File 64KB Executable Jar File 92KB Executable Jar File 157KB Executable Jar File 198 KB Executable Jar File 886 KB Executable Jar File 100 KB Executable Jar File 761 KB Executable Jar File 25KB Executable Jar File 45 KB Executable Jar File 15KB Executable Jar File 97 KB Executable Jar File 22KB Executable Jar File 2 001 KB Executable Jar File 158KB Executable Jar File SKB Executable Jar File 1 206KB Executable Jar File 114KB Executable Jar File 98KB Executable Jar File 138 KB Executable Jar File 143KB Executable Jar File 113KB Executable Jar File 1 899KB Executable Jar File 1 254 KB Executable Jar File A Arbeitsplatz Figure 2 1 Installation of MEPIX jar files in BEAM modules folder shown for Windows XP 2 2 Additional Requirements To be able to process all options properly the MEPIX processor needs the following add ons to be installed in BEAM if not already done MERI
5. flags derived for each pixel See section Section 3 4 for details on these GlobCover products 4 6 Control Buttons From all MEPIX tab panes the following control buttons can be accessed e Run If this button is clicked the processor will start the computations e Close If this button is clicked the MEPIX dialog is closed Copyright 2009 Brockmann Consult GmbH 15 ES MEPIX Software User Manual Version 1 1 BROCKMANN 15 December 2009 CONSULT e Help If this button is clicked this manual is displayed as online help Figure 4 6 MEPIX control buttons 4 7 Processing from command line Since the MEPIX processor makes use of the BEAM graph processing framework it can be used also as a command line tool outside BEAM VISAT The graph processing is invoked by the command e BEAM INSTALL DIR bin gpt To obtain general help on the praph processing use the command e BEAM INSTALL DIR bin gpt h Specific help on the MEPIX processor can be obtained with e BEAM INSTALL DIR bin gpt h mepix ComputeChain In this case information on the usage and a list of all available parameters are given see Figure 4 7 C WINDOWS system32 cmd exe gt gt gt has h mepix ComputeChain E mepix ComputeChain options Description This operator just calls a chain of other operators Source Options Ssource lt file gt The source product This is a mandatory source Parameter Optio
6. selected the output product will be saved to disk Output product format Select one of the available output product formats Select the output product directory by either typing the product path into the text filed or by pressing the file selection button to invoke a standard file dialog e Open in Visat If this checkbox is selected the output product is opened in Visat after successful processing 4 2 IPF Compatible Products Tab Pane tan MEPIX Pixel Identification Tool MERIS 02 Project v1 1 ERT E EEN Wi I O Parameters IPF Compatible Products Pressure Products C TOA Reflectances C Gas Absorption Corrected Reflectances C Land Water Reclassification Flags C Rayleigh Corrected Reflectances L2 Cloud Top Pressure and Surface Pressure L2 Cloud Detection Flags Figure 4 2 IPF Compatible Products Tab Pane This tab pane consists of the following components TOA Reflectances If this checkbox is selected the output product will contain the TOA Reflectances derived from radiance to reflectance conversion for each MERIS band Gas Absorption Corrected Reflectances If this checkbox is selected the output product will contain the gas absorption corrected reflectances for each MERIS band Land Water reclassification flags If this checkbox is selected the output product will contain an additional flag band derived from a land water reclassification Copyr
7. 1 3 install4j bin e ire lib licenses E LO modules lt gt v v Wechseln zu 2 beam config XML Configuration File 4 KB 1 Objekte e Freier Speicherplatz 148 GB 3 96 KB d Arbeitsplatz Figure 2 2 Configuration file in BEAM config folder shown for Windows XP Copyright O 2009 Brockmann Consult GmbH 5 MEPIX Software User Manual BROCKMANN Version 1 1 CONSULT 15 December 2009 E Notepad C Programme beam 4 6 1 config beam config Oax Datei Bearbeiten Suchen Ansicht Format Sprachen Einstellungen Makro Ausf hren Erweiterungen Fenster n Pe asis HR OC ew zs BRAT sz Q pi 70 2 The font of the task label of the splash screen 72 Default value is Verdana ITALIC 10 73 beam splash taskLabel font Verdana ITALIC 10 74 75 The colour of the task label of the splash screen given as lt R gt 76 Default value is 255 255 255 white 77 wbeam splash taskLabel color 255 255 255 170 78 79 The position of the task label of the splash screen given as lt x 50 Default value is lt splash progressBar area x gt lt splash progressB 51 beam splash taskLabel pos 122 115 62 63 Controls caching of tiles of intermediate operations from raw r 84 to the finally displayed RGB image since BEAM 4 5 65 The default value is false meaning that no intermediate tile 66 beam imageManager enableIntermediateTileCaching true 87 88 Controls caching of til
8. 1 pressure used for cloud detection Default is 125 hPa PScatt Pressure Threshold Text field to set the threshold for PScatt pressure used for cloud detection Default is 700 hPa RhoTOA442 Threshold Text field to set the threshold for RhoTOA at 442nm used for cloud detection Default is 0 185 User Defined Delta RhoTOA442 Threshold Text field to set the threshold for the delta on the threshold of RhoTOA at 442nm used for cloud detection Default is 0 03 RhoTOA753 Threshold Text field to set the threshold for for RhoTOA at 442nm used for cloud detection Default is 0 1 RhoTOA Ratio 753 775 Threshold Text field to set the threshold for the RhoTOA ratio 753nm 775nm used for cloud detection Default is 0 15 MDSI Threshold Text field to set the MDSI threshold used for cloud detection See 2 for details on the usage of these thresholds in MERIS cloud detection algorithm Copyright O 2009 Brockmann Consult GmbH 13 ES MEPIX Software User Manual Version 1 1 BROCKMANN Con papa 15 December 2009 4 4 Pressure Products Tab Pane team MEPIX Pixel Identification Tool MERIS 02 Project v1 1 GT I O Parameters IPF Compatible Products Pressure Products Barometric Pressure C Use GETASSE30 DEM for Barometric Pressure Computation Surface Pressure FUB 02 project C Apply Tropical Atmosphere instead of USS standard in FUB algorithm P1 LISE O2 project all surfaces Surface Pressure
9. MEPIX Software User Manual a a D Et BROCKMANN CONSULT MEPIX Software User Manual Version 1 1 15 December 2009 ES MEPIX Software User Manual Version 1 1 BROCKMANN a ie 15 December 2009 Copyright 2009 Brockmann Consult GmbH ESA and the ESA logo are trademarks of the European Space Agency The Brockmann Consult logo is a trademark of Brockmann Consult GmbH Java is a trademark of Sun Microsystems Inc All other trademarks are acknowledged as the property of their respective owners Copyright 2007 2009 by the European Space Agency All Rights Reserved This document is subject to copyright protection No portion may be copied without prior written consent from the European Space Agency Copyright 2009 Brockmann Consult GmbH MEPIX Software User Manual Version 1 1 BROCKMANN CONSULT 15 December 2009 COLLABORATORS TITLE REFERENCE MEPIX Software User Manual 1 1 ACTION NAME DATE SIGNATURE WRITTEN BY Olaf Danne 15 December 2009 REVISION HISTORY NUMBER DATE DESCRIPTION NAME 1 1 15 12 09 Chapter Software Installation added O Danne 1 0 05 10 09 Initial release O Danne Copyright 2009 Brockmann Consult GmbH BROCKMANN CONSULT MEPIX Software User Manual Version 1 1 15 December 2009 Contents 1 Introduction 1 Ll RUDO ona e ee dd ee Ba ee eS He A ad 1 Ll uewe coi oa AA a AA 1 Lo Ver A A 1 14 Acronyms
10. P Re A ak aoe Be ee ed bak 7 2 SUN IES 25 a ht ani eee Pe hee Oe ee RSS SY EAE ES Bee OS 8 d Cloud Plass deal o i cca nee hae ae a d 8 34 De Bands Gere e ira as AE Bi a AP Re A a EE oe God 8 10 J Alta Provably e sc acean i tas SSPE A bee he ee ERE SY eS Bee be 8 10 Copyright 2009 Brockmann Consult GmbH vii ES MEPIX Software User Manual Version 1 1 BROCKMANN a ie 15 December 2009 Chapter 1 Introduction 1 1 Scope This document is the software user manual SUM for the MEPIX processor 1 2 Objectives MEPIX is a BEAM scientific processor for multiple use In the short term it is serving as an experimental platform to evaluate the new products which are derived from the exploitation of the oxygen band This work is done in the context and funded by the ESA O2 project In parallel that part of the MERIS L2 processing which is relevant for the pixel classification is also implemented in MEPIX The objective is to test the standard MERIS pixel classification with the new pressure products Furthermore the pixel classification as developed in the GlobCover and AlbedoMap projects has been integrated in the MEPIX processor The objective is to compare the standard L2 pixel classification with the GlobCover one This work is done for the MERIS Data Quality Working Group and is funded through the Pixel Classification Processor workpackage of the BEAM maintenance contract 1 3 Reader Level This specification is mainly written
11. S L2 Auxdata module GETASSE30 DEM e GETASSE30 DEM reader Copyright O 2009 Brockmann Consult GmbH BROCKMANN MEPIX Software User Manual Version 1 1 15 December 2009 The MERIS L2 Auxdata and the GETASSE30 DEM reader can be installed with the BEAM module manager See BEAM help documentation for details http www brockmann consult de beam doc help visat ModuleManager html The GETASSE30 DEM can be downloaded from the BEAM download page See also BEAM help documentation http www brockmann consult de beam doc help visat GETASSE30ElevationModel html 2 3 MEPIX QWG Version The MEPIX software offers a special mode for QWG users which provides various additional processing options To access these options a special configuration needs to be performed Figure 2 2 Figure 2 3 go to the config folder of the BEAM installation edit the file gt beam config with a text editor restart BEAM VISAT 2 config gt Datei Bearbeiten Ansicht Favoriten add the entry mepixMode QWQ in a new line at the end of the file Max ay Adresse C C Programme beam 4 6 1 config Ordner Neuer Ordner E 5 Program Files E O Programme a amp 7 Zip EH O Adobe E O AMD E O apache H 5 apache ant 1 6 5 H 5 ATI Technologies O AvRack E E beam 3 7 H E beam 4 2 ll 5 beam 4 2 SNAPSHOT H 5 beam 4 2 SNAPSHOT bak H 5 beam 4 5 H beam 4 5 1_01 H 5 beam 4 5 2 E E beam 4 6 0 E E beam 4 6
12. and Nomenclature ENEE ma a a e EE ae 1 LAI eegne SA A A a Mee A 1 EL ANGER A e A a ee as A A ti OS e 2 LS Retetence Documents o o e a ees AEN Re e e Ee ad a Gy era Rte e da 2 2 Software Installation 3 21 MEPIX Se BEAM PUBI ca eee Ro ee ee A ee eee A hae Phe eS Ree eee 3 22 Ee eegene acce a SS RA OR E RE AE EA we See e 4 20 MEPIX OWO egenen os al Bek ae a EN ARE ae Dace ee GS alge E 5 3 MEPIX Products 7 3 1 Standard L2 Products QWG mode o e cec coea e eh SRE BAe a RR ee ES 7 ILI Clotid Top PRESS oc cocca eee A eda eee oA eae a 7 KD DEENEN H uo E Pet Aa ee A ee ee Bae EE 8 3 2 Standard L2 Products nominal mode 2 2 ee a we eee 8 ie MI PIC tts NA 8 43 1 Surface Preseure PUB lt 2 ssa ee dae RR SERS Bae Eee EN Be eae amp 9 Jaa TOA Pressure CPI LISE co ea hee bea ee eee eae ee eo eA eae eo 9 225 Ee Pressure SEF o osos e E a GR eee e S 9 3 3 4 Rayleiph comected TOA Pressure PZ LISE o oc cn ee A A E 9 235 Aerosol apparent pressure PScatt LISE o e a ea A e 9 34 CGloblover Products OWG mode lt lt ke ce EAR ee a a ee He GS 9 SAL Bie Bane 26 24 ae EA ee hee PE ee eS Re E Sea Boop ae AS BALES amp OS 9 S42 Cloud Probabilily A 43604858 6 4b eae ee Ba baa ew ae eR eee ee a 9 Copyright 2009 Brockmann Consult GmbH iv ES MEPIX Software User Manual Version 1 1 Ea R 15 December 2009 MEPIX Processor 11 AL WO Pornos TAR Pane oasis be BS Pack Se os 11 42 IPP Compatible Products Tab Pa
13. es of graph processing framework GPF o 89 The default value is false meaning that GPF operator tiles a 90 beam gpf disableO0peratorTilelaching true 91 92 additionalOutputBands RS 93 54 mepixMode ONG al Normal text file nb char 4059 Ln 94 Col 16 Sel 15 DosiWindows ANSI Figure 2 3 Configuration for QWG mode in BEAM config file Copyright 2009 Brockmann Consult GmbH 6 ES MEPIX Software User Manual Version 1 1 BROCKMANN a ie 15 December 2009 Chapter 3 MEPIX Products 3 1 Standard L2 Products QWG mode The standard L2 products which can be derived using the MEPIX tool in QWG mode are e Cloud Top Pressure e Surface Pressure e Cloud Flag The algorithms have been implemented on the basis of the recent DPM and IODD versions 180 i8r0 One major difference to the IPF implementation is that the pressure products are calculated for all surfaces This has been done in order to be able to assess later the possibility of using the pressure products for pixel classification However over cloud and cloud free land pixels respectively the cloud top pressure and land surface pressure products should be identical between MEPIX and the standard processing 3 1 1 Cloud Top Pressure The cloud top pressure CTP is basically derived with an algorithm as described for the standard Level 2 processing 1 section 4 5 3 The main characteristics of this algorithm are summarized in the following table MEPIX CTP algori
14. essureQWGOut put Ct pStraylightCorrFub lt boo lean gt Bets See EE to lt boolean gt ault value is false PipfQUGUserDef inedRhoToa753Thresho1d lt double gt E rakes ra Pine Ee to lt double gt ault value is Pc loudOut put CloudProbabilit y lt hboolean gt Sets parameter cloudOutputCloudProbability to lt boolean gt Default value is false Pc loudOut put Blue Band lt boo lean gt Sets parameter cloudOutputBlueBand to lt boolean gt Default value is false y 41 Figure 4 7 MEPIX command line processing Copyright 2009 Brockmann Consult GmbH 16
15. for the following audiences e MEPIX Application users The MEPIX user manual specifications assumes that the reader is familiar with basic concepts in using the BEAM software and its integrated processors 1 4 Acronyms and Nomenclature 1 4 1 Acronyms e BC Brockmann Consult e ESA European Space Agency e ESTEC European Space Technology and Research Centre e SUM Software User Manual Copyright 2009 Brockmann Consult GmbH 1 ES MEPIX Software User Manual Version 1 1 BROCKMANN Ea ie 15 December 2009 1 4 2 Nomenclature 1 5 Reference Documents e 1 MERIS Level 2 Detailed Processing Model PO TN MEL GS 0006 15 July 2009 Issue i8r0 e 2 MERIS Level 2 Detailed Processing Model PO TN MEL GS 0006 30 June 2005 Issue i7r3a e 3 Lindstrot R Preusker R and J Fischer 2008 The retrieval of land surface pressure from MERIS measurements in the oxygen A band In preparation e 4 Lindstrot R Preusker R and J Fischer 2008 Empirical correction of stray light within MERIS and the retrieval of surface and cloud top pressure Free University of Berlin Internal TechnicalNote e 5 R Santer and O Aznay 2008 Direct to direct O2 transmittances Determine the surface pressure LISE Internal Technical Note Copyright 2009 Brockmann Consult GmbH 2 ES MEPIX Software User Manual Version 1 1 BROCKMANN a ie 15 December 2009 Chapter 2 Software Installation 2 1 MEPIX as BEAM plugin A
16. ight 2009 Brockmann Consult GmbH 12 Be MEPIX Software User Manual Version 1 1 BROCKMANN Let i 15 December 2009 Rayleigh Corrected Reflectances If this checkbox is selected the output product will contain the Rayleigh corrected re flectances for each MERIS band L2 Cloud Top Pressure and Surface Pressure If this checkbox is selected the output product will contain bands with the L2 Cloud Top Pressure and Surface Pressure derived as described in Section 3 2 L2 Cloud Detection Flags If this checkbox is selected the output product will contain a cloud classification flag band derived as described in Section 3 2 4 3 IPF Compatible Products Tab Pane QWG mode tan MEPIX Pixel Identification Tool MERIS 02 Project v1 1 C TOA Reflectances C Gas Absorption Corrected Reflectances C Land Water Reclassification Flags C Rayleigh Corrected Reflectances L2 Cloud Top Pressure and Surface Pressure L2 Cloud Detection Flags P1 Pressure Threshold PScatt Pressure Threshold RhoTOA4442 Threshold User Defined Delta RhoTOA442 Threshold RhoTOA753 Threshold RhoTOA Ratio 753 775 Threshold MDSI Threshold Figure 4 3 IPF Compatible Products Tab Pane in QWG mode If MEPIX is run in QWG mode the IPF Compatible Products tab pane provides additional components Figure 4 3 Pl Pressure Threshold Text field to set the threshold for P
17. ns PpressureOut put Psurf Fub lt hoo lean gt Sets parameter pressureOutputPsurfFub to lt boolean gt Default value is true Pc loudOut put CombinedCloud lt hoolean gt Sets parameter cloudOut put CombinedCloud to lt hoolean gt Default value is false Pipf Out put L2 Pressures lt boo lean gt Sets parameter eA pEOUEPUCLZ EES ss unas a to lt boolean gt Default value is true Pipf Out putRayle igh lt boo lean gt Sets parameter ipf Out putRayle igh to lt boolean gt Default value is false PpressureOut put PiLise lt boolean gt Sets parameter pressureOutputPiLise to lt boolean gt Default value is true Ppressure Out put Pharo lt boo lean gt Sets parameter pressureOutputPharo to lt boolean gt Default value is true PpressureOut put PSurf Lise lt boolean gt Sets parameter pressureOutputPSurfLise to lt boolean gt Default value is true Pipf Out put LandWater lt hoolean gt Sets parameter ipfOutputLandWater to lt hoolean gt Default value is false Pipf QWGUserDef inedDeltaRhoToa442Thresho ld lt double gt Bats pune cea DEE to lt double gt ault value is 8 83 Pipf Out put Gaseous lt boo lean gt Sets parameter ipfOut putGaseous to lt boolean gt Default value is false PpressurePharoGetasse lt hoolean gt Sets parameter pressurePharoGetasse to lt boolean gt Default value is false Ppress
18. oud Probability derival Copyright 2009 Brockmann Consult GmbH ES MEPIX Software User Manual BROCKMANN CONSULT Version 1 1 15 December 2009 Chapter 4 MEPIX Processor The MEPIX processor user interface is represented by one main dialog which consists of the following components e UO Parameters Tab Pane e IPF Compatible Products Tab Pane e Pressure Products Tab Pane e Run Close and Help control buttons 4 1 I O Parameters Tab Pane tan MEPIX Pixel Identification Tool MERIS 02 Project v1 1 Tee i I O Parameters IPF Compatible Products Pressure Products Source Product Name Target Product Name Save as BEAM DIMAP vw Directory C Dokumente und Einstellungen olafd icol landsat Open in VISAT Figure 4 1 I O Parameters Tab Pane This tab pane consists of the following components Copyright 2009 Brockmann Consult GmbH ES MEPIX Software User Manual Version 1 1 BROCKMANN Let Tae 15 December 2009 e Input product file Select the input product file by either typing the product path into the text filed or by pressing the file selection button to invoke a standard file dialog e Output product file Select the output product file by either typing the product path into the text filed or by pressing the file selection button to invoke a standard file dialog e Output product format and target directory Save as If this checkbox is
19. proach including a straylight correction as developed by FUB e TOA Pressure P 1 derived from an improved LISE algorithm e Surface Pressure derived from an improved LISE algorithm e Rayleigh corrected TOA Pressure P2 derived from an improved LISE algorithm e Aerosol apparent pressure PScatt LISE approach The algorithms have been implemented based on the documentation and breadboard software provided by FUB and LISE During two collocations the implementation was verified together with the algorithm developers Copyright 2009 Brockmann Consult GmbH 8 ES MEPIX Software User Manual Version 1 1 BROCKMANN a et 15 December 2009 3 3 1 Surface Pressure FUB This algorithm was developed as IDL code by Free University of Berlin FUB and is described in 3 The algorithm includes a new straylight correction scheme proposed by FUB see 4 Brockmann Consult provided a Java implementation in MEPIX A validation with the original IDL code was performed by applying Junit tests on distinct test data provided by FUB 3 3 2 TOA Pressure P1 LISE This algorithm was developed as FORTRAN code by LISE and is described in 5 Brockmann Consult provided a Java imple mentation in MEPIX A validation with the original FORTRAN code was performed by applying Junit tests on distinct test data provided by LISE 3 3 3 Surface Pressure LISE This algorithm was developed as FORTRAN code by LISE and is a slight exten
20. s a BEAM plugin the MEPIX processor needs the following software to be installed in advance BEAM version 4 6 or 4 6 1 The BEAM software can be obtained from the BEAM download page www brockmann consult de beam The MEPIX software delivery consists of three jar files the MEPIX main module and adjusted BRR Bottom of Rayleigh Reflectance and SDR Surface Directional Reflectance modules which provide additional Java classes used by MEPIX e mepix chain 1 1 jar e beam meris brr 2 0 3 SNAPSHOT jar e beam meris sdr 2 1 SNAPSHOT jar These files need to be copied into the modules folder of the BEAM installation Figure 2 1 Note that existing versions of these jar files need to be replaced overwritten There should not be more than one jar file for each of these modules in the modules folder Copyright O 2009 Brockmann Consult GmbH 3 BROCKMANN CONSULT MEPIX Software User Manual Version 1 1 15 December 2009 modules Datei Bearbeiten Ansicht Favoriten Extras DEK Ki Adresse ES C Programme beam 4 6 1 madules v Wechseln zu Ordner Neuer Ordner E O Program Files E Programme 7 Zip O Adobe amp apache apache ant 1 6 5 ATI Technologies D AvRack beam 3 7 E beam 4 2 beam 4 2 SNAPSHOT HR RR RH E RR BR E E beam 4 5 beam 4 5 1_01 beam 4 5 2 D beam 4 6 0 3 beam 4 6 1 3 install4j bin 3 config e O jre lib
21. sion of the TOA pressure using filter dependent C coefficients Brockmann Consult provided a Java implementation in MEPIX 3 3 4 Rayleigh corrected TOA Pressure P2 LISE This correction has been proposed by LISE to be applied on the TOA Pressure This product is provided as additional band in MEPIX 3 3 5 Aerosol apparent pressure PScatt LISE This algorithm was developed as FORTRAN code by LISE and is described in 5 Brockmann Consult provided a Java imple mentation in MEPIX A validation with the original FORTRAN code was performed by applying Junit tests on distinct test data provided by LISE 3 4 GlobCover Products QWG mode The GlobCover products pixel classification which can be derived using the MEPIX tool in QWG mode are e Blue Bands pixel classification e Cloud Probability MEPIX uses the implementation which had been developed within the GlobCover project 3 4 1 Blue Bands 3 4 2 Cloud Probability Copyright 2009 Brockmann Consult GmbH 9 ES MEPIX Software User Manual BROCKMANN CONSULT Version 1 15 December 2009 1 MEPIX Blue Band algorithm characteristics A simple blue band test that provides with very good results for VEGETATION has been adopted for MERIS and enhanced it by using the 412 nm channel The developed cloud screening method is applied to reflectances A first threshold for the B1 reflectances R1 is used to detect the mostbrilliant dense clouds The clo
22. te coo bbe bb ewe eee eee Eee ES 12 4 3 IPF Compatible Products Tab Pane QWG mode 13 4A Presse Products Tab Pane 2 ek RR Oe Ee Ae RS We DS A week ee E 14 4 5 Cloud Products Tab Pane QWG mode oaao 15 o oo se ee ee RR a ee Rs ae eg EA ees a SY Ae ee ee 15 47 Processing rom command MRS ossosa o a RE RR EE RK oe ae ee ee 16 Copyright 2009 Brockmann Consult GmbH v ES MEPIX Software User Manual T j 15 T e List of Figures 2 1 Installation of MEPIX jar files in BEAM modules folder shown for Windows XP 4 2 2 Configuration file in BEAM config folder shown for Windows XP aoaaa aaa 5 2 3 Configuration for QWG mode in BEAM config file 6 4 1 I Parameters Tab Pane ccoo EHR EE e EE e e e EEN EE i a 11 42 IPF Compatible Products Tab Pame se cee eee Se eee E SR ELE 8 Y 12 43 IPP Compatible Products Tab Pane in GWG mode osorno Eee PENS ESAS ES 13 44 Pressure Products Tab Pane lt o s co 6654865 44 4 RAD Ree ERA ee eee eee ee 14 4 5 Cloud Products Tab Pane QOWG mode only 46 5 45 5454 04 See ee ae ee eR HE ee e 15 dp MEPIX control butong A eS aw ee ee ae BH Re ES Bae Bee RA ESS E 16 4 7 MEPIX command line processing c lt sre 6 6b dd Sb A ee ba eA ae e Ern Ek ea ee 16 Copyright 2009 Brockmann Consult GmbH vi BROCKMANN CONSULT MEPIX Software User Manual Version 1 1 15 December 2009 List of Tables 3 1 loud Top Presse denval ce ee a aa A
23. thm characteristics Comparison of MEPIX and IPF megs products To retrieve the Cloud Top Pressure a neural net NN approach is used The MERIS signals in channel 10 11 the surface albedo and the geometry sun zenith angle viewing zenith angle and azimuth angle are used as input Implementation is the same Differences in results less than of the Neural Network The net produces the cloud top 1 percent for pixels flagged as cloudy likely due to pressure Depending on the surface albedo two different truncation errors neural nets are used one for surface albedo equal to zero one for nonzero surface albedo Neural Nets are selected according to spectral shift index Table 3 1 Cloud Top Pressure derival 3 1 2 Surface Pressure The surface pressure is also derived with an algorithm as described for the standard Level 2 processing 1 section 4 5 2 The main characteristics of this algorithm are summarized in the following table Copyright O 2009 Brockmann Consult GmbH 7 ES MEPIX Software User Manual Version 1 1 BROCKMANN CONSULT 15 December 2009 MEPIX surface pressure algorithm characteristics Differences to standard L2 algorithm Implementation is the same Differences in results less than 1 percent for pixels over land and not flagged as cloudy likely due to truncation errors To retrieve the surface pressure a polynominal algorithm is used as described in detail in 1 Table 3 2 S
24. udy pixels are validated trough a restoration process which eliminates false detections due to snow covers A threshold on the NDSI R10 R13 R10 R13 is used to detect snow covers The remained clear pixels are tested by a second filter which performs the ratio R11 R10 related to the altitude of the scattering surface An optimised threshold permits to identify thin clouds not detect by the first blue band test Three states are supposed 0 Out of Orbit 1 Clear and 2 Cloud The optimised cloud mask is globally coherent with the bright flag of standard MERIS products However a higher performance of the cloud screening over semi transparent clouds can be observed Large areas are not detected by the bright flag or probability algorithms This analysis shows that blue bands algorithm can better detect semi transparent clouds Table 3 4 Blue Bands derival MEPIX Cloud Probability algorithm characteristics This algorithm includes two neural networks land water which get as input e the reflectances in bands 1 6 9 10 13 e the reflectances ratio of band 11 band 10 which is a measure for the air mass above the measured surface e the surface pressure from the tie point grid e the exact pixel wavelength of band 11 e and some pixel geometry The output of the net is a floating number 0 1 indicating the likelihood that the pixel is a cloud This is compared against a threshold to set a binary cloud flag Table 3 5 Cl
25. ureFubTropicalAtmosphere lt boolean gt Sets parameter pressureFubTropicalAtnosphere to lt boolean gt Default value is false PipfQUGUserDef inedRhoToa442Thresho ld lt double gt Beca SE ipfQUGUserDef inedRhoToa442Threshold to lt double gt ault value is PipfQUGUserDef inedMDS I Thresho 1d lt double gt Sets parameter tt rberineahDsIThresho a to lt double gt Default value is Pipf Out put Rad2Ref 1 lt boolean gt Sets parameter sprout puenadanet 1 to lt boolean gt Default value is false Pipf QWGUserDef inedPScattPressureThresho ld lt double gt Beta Geh ipf QUGUserDef inedPScattPressureThreshold to lt double gt ault value is PpressureOut put PScattLise lt boolean ets parameter pressure itputPScattLise to olean gt Ow PS Lise lt boolean gt E Ow PS Lise lt boolean gt Default value is true PipfQUGUserDef inedRhoToaRat i0753775T hresho ld lt double gt pore ek ipf QUGUserDef inedRhoToaRat i0753775Thresho 1d to lt double gt ault value is PpressureOut put P2Lise lt boolean gt Sets parameter preseuroOutputP2Lice to lt boolean gt Default value is true Pipf Out put L2CloudDetect ion lt hoolean gt Sets parameter ipf Out putL2CloudDetection to lt boolean gt Default value is true PipfQUGUserDef inedP1PressureThresho 1d lt double gt pets araneter ipf QUGUserDef inedPiPressureThresho ld to lt double gt au value s 8 Ppr
26. urface Pressure derival 3 1 3 Cloud Flags The cloud flags are also derived with an algorithm as described for the standard Level 2 processing 1 section 5 5 The main characteristics of this algorithm are summarized in the following table MEPIX cloud flag determination characteristics Comparison of MEPIX and IPF megs products For pixels identified as LAND tests are performed on the ratio of Rayleigh corrected reflectance at several wavelengths The coarse Rayleigh correction uses an algorithm described in 1 section 5 5 6 to compute the reflectance due to Rayleigh scattering Finally a set of Boolean parameters are used to index a decision table which provides the CLOUD_F flag see 1 step 5 5 1 for details No differences Almost full agreement in results Table 3 3 Cloud Flags derival 3 2 Standard L2 Products nominal mode The standard L2 products which can be derived using the MEPIX tool in nominal non QWG mode are also e Cloud Top Pressure e Surface Pressure e Cloud Flag In opposite to the QWG mode the algorithms have been implemented on the basis of the former DPM IODD versions ir72a 1713A 2 Overall the algorithms are quite similar but there are a few differences in detail see 1 and 2 for more information 3 3 O2 Products The MEPIX tool can also derive products which will are of interest within the O2 project These are e Surface Pressure derived from a new Neural Net ap
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