Display 2D data with Python

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Contents

Description

This page details an example of constructing an image from a 2D data array with Python and the Matplotlib library. In this particular case, the data are read in a HDF4 file, but it can also be read from any source as long as the data are passed to Matplotlib in a numpy array.

Prerequisites

Language

  • Python

Libraries

  • pyhdf
  • matplotlib
  • numpy

Input File

The data file used in the example below is : Cardinal_sine_2D.hdf

Output Image

The program creates the image

Representation (2D) of the sinc function
Representation (2D) of the sinc function

Source Code

from pylab import *
from numpy import *
from pyhdf.SD import *
 
# Path to the file
fileName = "Cardinal_sine_2D.hdf"
 
# Open HDF file for reading
filehdf = SD ( fileName )
 
# Reading attributes
print "file : ", fileName
 
# Read the sds data
sds = filehdf.select ( 0 ).get ( )
 
# Display image
imshow ( sds )
 
# Image title
title ( "Representation of the sinc function", weight = "bold", size = 22 )
 
xticks([])
yticks([])
 
# Save the current figure
savefig ( "Cardinal_sine_2D.png" )
show()
 
# Terminate access to the file
filehdf.end()

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