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CDOUser's GuideClimate Data Operators

Version 1.5.9

December 2012

Uwe Schulzweida, Luis Kornblueh {MPI for Meteorology

Ralf Quast {Brockmann Consult

1. Introduction6

1.1. Building from sources

1.1.1. Compilation

1.1.2. Installation

1.2. Usage

1.2.1. Options

1.2.2. Operators

1.2.3. Combining operators

1.2.4. Operator parameter

1.3. Horizontal grids

1.3.1. Grid area weights

1.3.2. Grid description

1.4. Z-axis description

1.5. Time axis

1.5.1. Absolute time

1.5.2. Relative time

1.5.3. Conversion of the time

1.6. Parameter table

1.7. Missing values

1.7.1. Mean and average

2. Reference manual16

2.1. Information

2.1.1. INFO - Information and simple statistics

2.1.2. SINFO - Short information

2.1.3. DIFF - Compare two datasets eld by eld

2.1.4. NINFO - Print the number of parameters, levels or times

2.1.5. SHOWINFO - Show variables, levels or times

2.1.6. FILEDES - Dataset description

2.2. File operations

2.2.1. COPY - Copy datasets

2.2.2. REPLACE - Replace variables

2.2.3. MERGE - Merge datasets

2.2.4. SPLIT - Split a dataset

2.2.5. SPLITTIME - Split timesteps of a dataset

2.2.6. SPLITSEL - Split selected timesteps

2.3. Selection

2.3.1. SELVAR - Select elds

2.3.2. SELTIME - Select timesteps

2.3.3. SELBOX - Select a box of a eld

2.4. Conditional selection

2.4.1. COND - Conditional select one eld

2.4.2. COND2 - Conditional select two elds

2.4.3. CONDC - Conditional select a constant

2.5. Comparison

2.5.1. COMP - Comparison of two elds

2.5.2. COMPC - Comparison of a eld with a constant

2.6. Modication

2.6.1. SET - Set eld info

47 2

ContentsContents2.6.2. SETTIME - Set time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

2.6.3. CHANGE - Change eld header

2.6.4. SETGRID - Set grid information

2.6.5. SETZAXIS - Set z-axis type

2.6.6. SETGATT - Set global attribute

2.6.7. INVERT - Invert latitudes

2.6.8. INVERTLEV - Invert levels

2.6.9. MASKREGION - Mask regions

2.6.10. MASKBOX - Mask a box

2.6.11. SETBOX - Set a box to constant

2.6.12. ENLARGE - Enlarge elds

2.6.13. SETMISS - Set missing value

2.7. Arithmetic

2.7.1. EXPR - Evaluate expressions

2.7.2. MATH - Mathematical functions

2.7.3. ARITHC - Arithmetic with a constant

2.7.4. ARITH - Arithmetic on two datasets

2.7.5. MONARITH - Monthly arithmetic

2.7.6. YMONARITH - Multi-year monthly arithmetic

2.7.7. YDAYARITH - Multi-year daily arithmetic

2.7.8. YHOURARITH - Multi-year hourly arithmetic

2.7.9. ARITHDAYS - Arithmetic with days

2.8. Statistical values

2.8.1. CONSECSTAT - Consecute timestep periods

2.8.2. ENSSTAT - Statistical values over an ensemble

2.8.3. ENSSTAT2 - Statistical values over an ensemble

2.8.4. ENSVAL - Ensemble validation tools

2.8.5. FLDSTAT - Statistical values over a eld

2.8.6. ZONSTAT - Zonal statistical values

2.8.7. MERSTAT - Meridional statistical values

2.8.8. GRIDBOXSTAT - Statistical values over grid boxes

2.8.9. VERTSTAT - Vertical statistical values

2.8.10. TIMSELSTAT - Time range statistical values

2.8.11. TIMSELPCTL - Time range percentile values

2.8.12. RUNSTAT - Running statistical values

2.8.13. RUNPCTL - Running percentile values

2.8.14. TIMSTAT - Statistical values over all timesteps

2.8.15. TIMPCTL - Percentile values over all timesteps

2.8.16. HOURSTAT - Hourly statistical values

2.8.17. HOURPCTL - Hourly percentile values

100

2.8.18. DAYSTAT - Daily statistical values

101

2.8.19. DAYPCTL - Daily percentile values

102

2.8.20. MONSTAT - Monthly statistical values

103

2.8.21. MONPCTL - Monthly percentile values

104

2.8.22. YEARSTAT - Yearly statistical values

105

2.8.23. YEARPCTL - Yearly percentile values

106

2.8.24. SEASSTAT - Seasonal statistical values

107

2.8.25. SEASPCTL - Seasonal percentile values

108

2.8.26. YHOURSTAT - Multi-year hourly statistical values

109

2.8.27. YDAYSTAT - Multi-year daily statistical values

110

2.8.28. YDAYPCTL - Multi-year daily percentile values

111

2.8.29. YMONSTAT - Multi-year monthly statistical values

112

2.8.30. YMONPCTL - Multi-year monthly percentile values

113

2.8.31. YSEASSTAT - Multi-year seasonal statistical values

114

2.8.32. YSEASPCTL - Multi-year seasonal percentile values

115

2.8.33. YDRUNSTAT - Multi-year daily running statistical values

116

2.8.34. YDRUNPCTL - Multi-year daily running percentile values

118 3

ContentsContents2.9. Correlation and co.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

2.9.1. FLDCOR - Correlation in grid space

120

2.9.2. TIMCOR - Correlation over time

12 0

2.9.3. FLDCOVAR - Covariance in grid space

121

2.9.4. TIMCOVAR - Covariance over time

121

2.10. Regression

122

2.10.1. REGRES - Regression

123

2.10.2. DETREND - Detrend time series

123

2.10.3. TREND - Trend of time series

124

2.10.4. SUBTREND - Subtract a trend

124

2.11. EOFs

125

2.11.1. EOFS - Empirical Orthogonal Functions

126

2.11.2. EOFCOEFF - Principal coecients of EOFs

128

2.12. Interpolation

129

2.12.1. REMAPGRID - SCRIP grid interpolation

130

2.12.2. GENWEIGHTS - Generate SCRIP grid interpolation weights

132

2.12.3. REMAP - SCRIP grid remapping

134

2.12.4. REMAPETA - Remap vertical hybrid level

135

2.12.5. INTVERT - Vertical interpolation

137

2.12.6. INTLEVEL - Linear level interpolation

138

2.12.7. INTLEVEL3D - Linear level interpolation from/to 3d vertical coordinates

139

2.12.8. INTTIME - Time interpolation

14 0

2.12.9. INTYEAR - Year interpolation

141

2.13. Transformation

142

2.13.1. SPECTRAL - Spectral transformation

143

2.13.2. WIND - Wind transformation

145

2.14. Import/Export

146

2.14.1. IMPORTBINARY - Import binary data sets

147

2.14.2. IMPORTCMSAF - Import CM-SAF HDF5 les

148

2.14.3. IMPORTAMSR - Import AMSR binary les

149

2.14.4. INPUT - Formatted input

150

2.14.5. OUTPUT - Formatted output

151

2.15. Miscellaneous

153

2.15.1. GRADSDES - GrADS data descriptor le

154

2.15.2. FILTER - Time series ltering

155

2.15.3. GRIDCELL - Grid cell quantities

156

2.15.4. SMOOTH9 - 9 point smoothing

157

2.15.5. REPLACEVALUES - Replace variable values

157

2.15.6. TIMSORT - Timsort

158

2.15.7. VARGEN - Generate a eld

158

2.15.8. ROTUV - Rotation

160

2.15.9. MASTRFU - Mass stream function

160

2.15.10.HISTOGRAM - Histogram

161

2.15.11.SETHALO - Set the left and right bounds of a eld

161

2.15.12.WCT - Windchill temperature

162

2.15.13.FDNS - Frost days where no snow index per time period

162

2.15.14.STRWIN - Strong wind days index per time period

162

2.15.15.STRBRE - Strong breeze days index per time period

163

2.15.16.STRGAL - Strong gale days index per time period

163

2.15.17.HURR - Hurricane days index per time period

163

2.16. Climate indices

164

2.16.1. ECACDD - Consecutive dry days index per time period

166

2.16.2. ECACFD - Consecutive frost days index per time period

166

2.16.3. ECACSU - Consecutive summer days index per time period

167

2.16.4. ECACWD - Consecutive wet days index per time period

167

2.16.5. ECACWDI - Cold wave duration index w.r.t. mean of reference period

169

2.16.6. ECACWFI - Cold-spell days index w.r.t. 10th percentile of reference period

169

2.16.7. ECAETR - Intra-period extreme temperature range

171 4

ContentsContents2.16.8. ECAFD - Frost days index per time period. . . . . . . . . . . . . . . . . . . . . . . 171

2.16.9. ECAGSL - Thermal Growing season length index

172

2.16.10.ECAHD - Heating degree days per time period

173

2.16.11.ECAHWDI - Heat wave duration index w.r.t. mean of reference period

173

2.16.12.ECAHWFI - Warm spell days index w.r.t. 90th percentile of reference period

175

2.16.13.ECAID - Ice days index per time period

175

2.16.14.ECAR75P - Moderate wet days w.r.t. 75th percentile of reference period

176

2.16.15.ECAR75PTOT - Precipitation percent due to R75p days

176

2.16.16.ECAR90P - Wet days w.r.t. 90th percentile of reference period

177

2.16.17.ECAR90PTOT - Precipitation percent due to R90p days

177
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