GrADS User's Guide
Table of Contents
General Topics
Starting and Quiting GrADS
Basic Concept of Operation
Gridded Data Sets
Gridded Data Descriptor File
Structure of a Gridded Binary Data File
Binary Data Formats
Creating Data Files
The Ensemble Dimension in GrADS version 2.0
Elements of a GrADS Data Descriptor File
Creating a Data Descriptor File for GRIB Data
Reading NetCDF and HDF-SDS Files with GrADS
Reading and Writing Compressed Data Sets
Reinitialization of GrADS
Command Line Editing and History
External Utilities
Analysis Topics
Dimension Environment
GrADS Variables
Variable Names
Defining New Variables
Undefining Variables
GrADS Expressions
Using Templates to Aggregate Data Files
About GrADS Station Data
Structure of a GrADS Station Data File
Creating a GrADS Station Data File
GrADS Station Data Descriptor File
The STNMAP Utility
The BUFR Format for Station Data
Using Station Data
Operating on Station Data
Plotting Station Models
Drawing Arbitrary Cross Sections
User Defined Functions
Overview of User Defined Functions
The user defined function table
Format of the function data transfer file
Format of the function result file
Example: Linear Regression Function
Using Pre-Projected Data in GrADS
Polar Stereo Preprojected Data
Lambert Conformal Preprojected Data
NCEP ETA Model
NCEP polar stereographic grid for SSMI data
CSU RAMS oblique polar stereographic grid
Pitfalls when using preprojected data
GrADS Display Projections
Summary and Plans
Non-Standard Variable Formats and Data File Structures
Display Topics
Displaying Data
Drawing Plots
Clearing the Display
Graphics Output Types
Graphics Options
Drawing Basic Graphics Elements
Drawing the Contents of a Shapefile
Animation
Page Control
Real and Virtual Pages
Controlling the Plot Area
Drawing Multi-Panel Plots
Color Control
Font Control
Producing Hardcopy and Image Output from GrADS
GrADS Scripting Language
Introduction to GrADS scripts
Elements of the Language:
comment
statement
assignment
say / prompt / pull
if / else / endif
while / endwhile
variables
operators
expressions
Functions
Intrinsic Functions
Commands that complement the scripting language
Widgets
Dynamic Loading of Script Functions
Script Library