README.md

Gridding and Granulation using Ctypes

This is a module gridding satellite swath data, and granulating global gridded data. It contains the following files...

grid_gran
    ├── griddingAndGranulation.c
    ├── __init__.py
    ├── LandWaterMask.py
    ├── PrecipWater.py
    ├── README.md
    └── snapToGrid.py

• README.md : This file.
• __init__.py: Pythion init file which loads the required modules.
• snapToGrid.py: Contains the SnapToGrid class, which contains a variety of methods which do gridding with a variety of methods.
• griddingAndGranulation.c : Contains various C functions for doing gridding and granulation.
• LandWaterMask.py: Contains example use of the granulation of a discrete dataset using nearest-neighbour.
• PrecipWater.py: Contains example use of the granulation of a continuous dataset using bilinear interpolation.

Compilation instructions for the C dynamic library

• Statically linked

gcc -c -fPIC griddingAndGranulation.c
ar rcs libgriddingAndGranulation.a griddingAndGranulation.o
gcc -c -fPIC main.c
gcc -static main.o -L/usr/lib64 -L. -lgriddingAndGranulation -o main_static

• Dynamically linked, default optimisation

gcc -c -fPIC -O0 griddingAndGranulation.c -o griddingAndGranulation.o
gcc -shared -O0 -Wl,-soname,libgriddingAndGranulation.so.1 -lm -o libgriddingAndGranulation.so.1.0.1 griddingAndGranulation.o

• Dynamically linked, more optimisation

gcc -c -fPIC -O3 griddingAndGranulation.c -o griddingAndGranulation.o
gcc -shared -O3 -Wl,-soname,libgriddingAndGranulation.so.1 -lm -o libgriddingAndGranulation.so.1.0.1 griddingAndGranulation.o