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grads2gt's Introduction

Introduction

GrADS2gt is an extension of GrADS Version 2.x (GrADS2).

The differences from the original GrADS2 are as follows:

  1. Support GTOOL3 format (read)
  2. Support some kinds of calendars: noleap, 360_day, julian
  3. Add a command cd (change directory)

Install

You need to install libgtool3 before GrADS2gt installation if you want to add GTOOL3 format support.

Examples

Command gtopen

To access variables in a GTOOL3-formatted file, you must first open a GTOOL3 file with gtopen. Then its file name can be treated as the variable name. After that, the variable can be handled in the same way as original GrADS2.

ga-> gtopen T2                                # Open a file named `T2`.
The global calendar is set to noleap.         # Guess a calendar automatically.
Data file T2 is open as file 1
LON set to 0 360
LAT set to -88.9277 88.9277
LEV set to 1 1
Time values set: 1699:1:1:0 1699:1:1:0
E set to 1 1
ga-> d T2                # `T2` can be used as a variable name.
ga-> d t2                # This also works (variable name is case-insensitive).
ga-> d t2(t=2)           # View data (No.2)

ga-> reinit
All files closed; all defined objects released;
All GrADS attributes have been reinitialized
ga-> gtopen u10
The global calendar is set to noleap.
Data file u10 is open as file 1
LON set to 0 360
LAT set to -88.9277 88.9277
LEV set to 1 1
Time values set: 1699:1:1:0 1699:1:1:0
E set to 1 1
ga-> gtopen v10
The global calendar is set to noleap.
Data file v10 is open as file 2
ga-> q files
File 1 : MIROC6
  Descriptor: u10
  Binary: u10
File 2 : MIROC6
  Descriptor: v10
  Binary: v10
ga-> d sqrt(u10 * u10 + v10.2 * v10.2) # v10 is in File #2.
Contouring: 0 to 11 interval 1
ga-> d sqrt(u10 * u10 + v10 * v10)  # File number (#2) can be omitted.
v10 is found in File #2             # Look up the name (v10) automatically.
v10 is found in File #2
Contouring: 0 to 11 interval 1

Command vgtopen

vgtopen is another version of gtopen. vgtopen opens a new file, but its file number is the same as the file previously opened by gtopen. As a result, these variables appear to be in the same dataset.

ga-> reinit
ga-> gtopen u10    # At first, use gtopen.
ga-> vgtopen v10   # Next, use vgtopen.
ga-> vgtopen olr   # ditto
ga-> vgtopen osr   # ditto
ga-> q files
File 1 : MIROC6    # Only File #1 exists.
  Descriptor: u10
  Binary: u10
ga-> q file 1
File 1 : MIROC6
  Descriptor: u10
  Binary: u10
  Type = Gridded
  Xsize = 256  Ysize = 128  Zsize = 1  Tsize = 12  Esize = 1
  Number of Variables = 4                    # Four variables are in File #1.
     u10  0    10m zonal wind [m/s]
     v10  0    10m meridional wind [m/s]
     olr  0    top longwave [W/m**2]
     osr  0    top shortwave [W/m**2]
ga-> d sqrt(u10 * u10 + v10 * v10)           # Both u10 and v10 are in File #1.
ga-> d olr + osr                             # ditto.

as clause

By default, the variable name is set from the file name, but user can specify any name with as clause. as clause can be used for both gtopen and vgtopen.

ga-> gtopen precipitation as pr                      # Use pr as variable name.
The global calendar is set to noleap.
Data file precipitation is open as file 1
LON set to 0 360
LAT set to -88.9277 88.9277
LEV set to 1 1
Time values set: 1699:1:1:0 1699:1:1:0
E set to 1 1
ga-> q files
File 1 : MIROC6
  Descriptor: pr
  Binary: precipitation
ga-> q file
File 1 : MIROC6
  Descriptor: pr
  Binary: precipitation
  Type = Gridded
  Xsize = 256  Ysize = 128  Zsize = 1  Tsize = 12  Esize = 1
  Number of Variables = 1
     pr  0    precipitation [kg/m**2/s]
ga-> d pr                            # pr can be used instead of precipitation.

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