ISCCP DX/D1/D2 New Cloud Data Documentation
Table of Contents
Page No.
1. INTRODUCTION:
1.1. PROJECT OVERVIEW.....................................1
1.2. SUMMARY OF CHANGES...................................2
1.3. DATA PRODUCTS........................................3
1.4. CONTACTS FOR ASSISTANCE AND DATA ORDERS..............5
2. DATA USER'S GUIDE.........................................7
2.1. D2 DATA (MONTHLY, 280 KM EQUAL-AREA GRID):
2.1.1. ARCHIVE TAPE LAYOUT...........................7
2.1.2. headER FILE CONTENTS..........................7
2.1.3. DATA FILE CONTENTS...........................10
2.2. D1 DATA (3-HOURLY, 280 KM EQUAL-AREA GRID):
2.2.1. ARCHIVE TAPE LAYOUT..........................16
2.2.2. headER FILE CONTENTS.........................16
2.2.3. DATA FILE CONTENTS...........................19
2.3. DX DATA (3-HOURLY, 30 KM SAMPLED IMAGE PIXELS):
2.3.1. ARCHIVE TAPE LAYOUT..........................27
2.3.2. headER FILE CONTENTS.........................27
2.3.3. DATA FILE CONTENTS...........................27
2.3.4. READ SOFTWARE................................32
2.4. CONVERSION TABLES FOR PHYSICAL VALUES (Updated on 20061031)
2.5. CODE DEFINITION TABLES (Updated on 20061031)
3. DATA PRODUCT DESCRIPTION.................................43
3.1. GRIDDED PRODUCTS ANALYSIS (STAGE D1 AND D2):
3.1.1. MAP GRID DEFINITIONS.........................43
3.1.2. VARIABLE DEFINITIONS.........................45
3.1.3. CLOUD TYPE DEFINITIONS.......................47
3.1.4. SPATIAL AVERAGING............................49
3.1.5. MERGING RESULTS FROM SEVERAL SATELLITES......50
3.1.6. TIME AVERAGING...............................52
3.1.7. ADJUSTMENTS..................................52
3.2. PIXEL LEVEL ANALYSIS (STAGE DX):
3.2.1. OVERVIEW.....................................55
3.2.2. MAP PROJECTIONS..............................56
3.2.3. VARIABLE DEFINITIONS.........................58
3.2.4. CLOUD DETECTION..............................60
3.2.4.1. FIRST CLEAR SKY RADIANCES...........60
3.2.4.2. FIRST CLOUD DETECTION THRESHOLDS....69
3.2.4.3. FINAL CLEAR SKY RADIANCES...........69
3.2.4.4. FINAL THRESHOLDS....................72
3.2.5. RADIATIVE TRANSFER MODEL ANALYSIS............73
3.2.5.1. RADIANCE MODEL DESCRIPTIONS.........75
3.2.5.2. CLEAR RETRIEVALS....................83
3.2.5.3. CLOUD RETRIEVALS....................84
4. ISCCP PROJECT INFORMATION:
4.1. DATA PROCESSING STRATEGY............................88
4.2. VALIDATION STRATEGY.................................89
4.3. ISCCP WORKING GROUP ON DATA MANAGEMENT..............90
4.4. SUMMARY OF PROJECT PHASES...........................92
5. REFERENCES:
5.1. GENERAL.............................................93
5.2. PROJECT DOCUMENTS...................................97
6. APPENDICES...............................................98
6.1. TOVS ATMOSPHERE GRIDDED DATA PRODUCT (TV):
6.1.1. OVERVIEW.....................................98
6.1.2. ARCHIVE TAPE LAYOUT..........................99
6.1.3. headER FILE CONTENTS.........................99
6.1.4. DATA FILE CONTENTS..........................101
6.1.5. VARIABLE DEFINITIONS........................103
6.1.6. SPATIAL RESOLUTION AND COVERAGE.............104
6.1.7. VERTICAL PROFILES...........................106
6.1.8. TIME AVERAGING..............................107
6.2. ICE/SNOW DATA PRODUCT (IS):
6.2.1. OVERVIEW....................................108
6.2.2. ARCHIVE TAPE LAYOUT.........................109
6.2.3. headER FILE CONTENTS........................109
6.2.4. DATA FILE CONTENTS..........................111
6.2.5. MAP GRID DEFINITIONS........................112
6.2.6. VARIABLE DEFINITIONS........................113
6.2.7. TIME RESOLUTION AND COVERAGE................113
6.2.8. MERGING ICE AND SNOW DATASETS...............113
List of Tables
Page No.
Table 2.1.1. D2 Archive Tape Layout..........................7
Table 2.1.2. Table of Contents Layout........................8
Table 2.1.3. Ancillary Data Table Layout.....................9
Table 2.1.4. D2 Data Record Prefix Layout...................11
Table 2.1.5. D2 Data Map Grid Cell Layout...................11
Table 2.2.1. D1 Archive Tape Layout.........................16
Table 2.2.2. Table of Contents Layout.......................17
Table 2.2.3. Ancillary Data Table Layout....................18
Table 2.2.4. D1 Data Record Prefix Layout...................20
Table 2.2.5. D1 Data Map Grid Cell Layout...................20
Table 2.3.1. DX Archive Tape Layout.........................27
Table 2.3.2. Table of Contents Layout.......................27
Table 2.3.3. DX Data Header Record Layout...................28
Table 2.3.4. DX Data Record Layout..........................29
Table 2.3.5. DX Data Section Layouts........................30
Table 2.5.1. Satellite Identification (ID) Codes
and ID Names...................................34
Table 2.5.2. Satellite Position Codes.......................35
Table 2.5.3. Vegetation Type Codes..........................35
Table 2.5.4. Variable Abbreviations and Physical Units......36
Table 2.5.5. Cloud Detection Threshold Codes
and Threshold Categories.......................37
Table 2.5.6. Land/Water/Coast Codes.........................38
Table 2.5.7. Cloud Types....................................38
Table 2.5.8. TOVS Atmospheric Data Origin Code..............40
Table 2.5.9. DX Satellite Type Codes and Geographic Sectors.40
Table 2.5.10. Ice/Snow Codes................................40
Table 2.5.11. Equal-Area Map Grid...........................41
Table 2.5.12. ISCCP Tape Designator.........................42
Table 3.1.1. PC Categories Used to Define Cloud Types.......48
Table 3.1.2. TAU Categories Used to Define Cloud Types......48
Table 3.2.1. Surface Types Used in Clear Sky Analysis.......61
Table 3.2.2. Radiance Difference Values Used in
IR Clear Sky Composite Tests...................66
Table 3.2.3. First Cloud Detection Threshold Values.........69
Table 3.2.4. Final Cloud Detection Threshold Values.........73
Table 4.1.1. ISCCP Data Management Commitments..............89
Table 4.3.1. Working Group on Data Management...............91
Table 6.1.1. TV Archive Tape Layout.........................99
Table 6.1.2. Table of Contents layout.......................99
Table 6.1.3. Ancillary Data Table Layout...................100
Table 6.1.4. TV Data Record Prefix Layout..................102
Table 6.1.5. TV Data Map Grid Cell Layout..................102
Table 6.1.6. NOAA Code Values in TV Data Record............104
Table 6.2.1. IS Archive Tape Layout........................109
Table 6.2.2. Table of Contents Layout......................110
Table 6.2.3. Ancillary Data Table Layout...................110
Table 6.2.4. IS Data Record Prefix Layout..................112
Table 6.2.5. Ice/Snow Cover Classification Codes...........113
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