Qiusheng Wu giswqs

Download ESA Sentinel-1 data from Sentinel-1 Scientific Data Hub (https://scihub.esa.int/dhus/)

Create a Sentinel-1 Scientific Data Hub account

Go here: https://scihub.esa.int/dhus/ and look for a "Register" link. Follow the registration steps.

Get aria2

aria2 is a lightweight multi-protocol & multi-source command-line download utility. It supports HTTP/HTTPS, FTP, BitTorrent and Metalink.

Converting mkv to mp4 with `ffmpeg`

Essentially just copy the existing video and audio stream as is into a new container, no funny business!

The easiest way to "convert" MKV to MP4, is to copy the existing video and audio streams and place them into a new container. This avoids any encoding task and hence no quality will be lost, it is also a fairly quick process and requires very little CPU power. The main factor is disk read/write speed.

With ffmpeg this can be achieved with -c copy. Older examples may use -vcodec copy -acodec copy which does the same thing.

These examples assume ffmpeg is in your PATH. If not just substitute with the full path to your ffmpeg binary.

Single file conversion example

Auto-Deploying Blogs to GitHub Pages with Travis CI

GitHub Pages doesn't support jekyll-archives now PR. We can use Travis CI to build it and push to gh-pages branch.

There is already some gists talks about this topic using bash. However, Travis now support deploy in .travis.yml , which is super easy to set up. (Deploying to GitHub Pages is experimental now [2018.07.25])

Create `.travis.yml` File

Here is an example.

	import rasterio.merge

	bounds=None
	res=None
	nodata=None
	precision=7

	def merge(input1,bounds, res, nodata, precision):
	import warnings
	warnings.warn("Deprecated; Use rasterio.merge instead", DeprecationWarning)

	# This script relies on the magick library, see this vignette for more information:
	# https://cran.r-project.org/web/packages/magick/vignettes/intro.html
	#
	# If you have Windows or Mac OS, I believe ImageMagick STL is integrated with the CRAN distribution
	# of the R magick library. If on Linux, see the "Build from source" section of the above URL
	#
	# This script will add year annotations from GIF animations generated and downloaded from the
	# LT-GEE Time Series Animator open access Earth Engine App:
	# https://emaprlab.users.earthengine.app/view/lt-gee-time-series-animator
	#

	# R script to add date annotations to a time series GIF created in Earth Engine.

	library(magick)

	gif = "C:/Users/braatenj/Downloads/africa.gif"
	dates = c(
	'Jan-08',
	'Jan-24',
	'Feb-09',
	'Feb-25',

	import pandas as pd

	def confusion_matrix(df: pd.DataFrame, col1: str, col2: str):
	"""
	Given a dataframe with at least
	two categorical columns, create a
	confusion matrix of the count of the columns
	cross-counts

	use like:

	"""
	Copyright 2020 Justin Braaten

	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at

	https://www.apache.org/licenses/LICENSE-2.0

	Unless required by applicable law or agreed to in writing, software