Peter Richardson meetar

Himawari-8 animation tutorial

Here’s how to make animations like this one. It requires intermediate Unix command-line knowledge, to install some tools and to debug if they don’t work. You’ll need these utilities:

curl (or you can translate to wget)
convert and montage, part of ImageMagick
ffmpeg, plus whatever codecs
parallel, for iteration that’s nicer than shell for loops or xargs
run everything in zsh for leading 0s in numerical ranges to work

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

	#!/usr/bin/env python

	'''
	Makes template filenames for interpolating Himawari-8 data.
	Assumes filenames like "2015-11-28T023500.png".
	I do this: python betwixt.py day-color \| parallel --colsep ' ' convert -average {1} {2} {3}
	'''

	import os
	import sys

	'''
	pairwise.py

	This script uses the Python Gensim library and heapq from the standard library to make
	massively fast and scalable pairwise comparisons between an aribtrarily large number of
	documents using TF-IDF and cosine distance.

	The script first generates a similarity matrix between all documents in a set, then uses
	heapq to retrieve the top K most similar matches to each document in that set. It has been
	tested on sets as large as 400,000 documents on a Macbook Air.

	# Credit http://stackoverflow.com/a/2514279
	for branch in `git branch -r \| grep -v HEAD`;do echo -e `git show --format="%ci %cr" $branch \| head -n 1` \\t$branch; done \| sort -r