Vu Tien Khang kvutien

Retired professional of space industry (47 years). Now in humanitarians, blockchain, AI and Earth Observation

kvutien / react-index.html

Last active January 2, 2021 21:12

A pure index.html generated by react-create-app

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="utf-8" />
	<link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
	<meta name="viewport" content="width=device-width, initial-scale=1" />
	<meta name="theme-color" content="#000000" />
	<meta
	name="description"
	content="Web site created using create-react-app"

kvutien / blank-react-app;js

Last active January 2, 2021 22:09

minimum app.js for illustration

	import './App.css';
	import React,{Component} from 'react';

	class App extends Component {
	constructor(){
	super();
	}

	render(){

kvutien / myfrontend.txt

Last active January 3, 2021 11:35

folder structure created by create-react-app

	kvutien@MBP18VTK-2 myfrontend % tree
	.
	├── README.md
	├── node_modules
	...
	├── package-lock.json
	├── package.json
	├── public
	│ ├── favicon.ico
	│ ├── index.html

kvutien / create-run-react.sh

Created January 3, 2021 11:25

Simple example of the commands to create and run a react application

	npx create-react-app myfrontend
	cd myfrontend
	npm run start

kvutien / React-Solidity-Zubait

Created January 8, 2021 11:04

Updated solidity code for Zubair Ahmed

	ppragma solidity ^0.4.11;

	contract ReactExample{
	address private owner;
	string public youAwesome;
	string private secret;

	function ReactExample() public {
	owner = msg.sender;
	youAwesome = 'You are awesome';

kvutien / BestNDVIMosaic.js

Last active January 10, 2021 22:35

Generate mosaic with the best NDVI of a month over a period of time

	/*
	* @notice GEE JavaScript for Code Editor
	* @notice Generate a mosaic using pixels of the best NDVI of all images of a month
	* @notice Do it over all same months of a period of time, for example March (or August, or December)
	* @notice ... useful to remove clouds and calculate monthly NDVI stats over several years
	* @author Vu Tien Khang, licence MIT, Jan 2021
	*/
	// make a list of years composing the history
	var history = ee.List.sequence(2017, 2020);
	// per year of history, calculate bestNDVI and add to bestNDVICollection

kvutien / BestNDVIMosaic-full.js

Last active January 11, 2021 09:11

Complete GEE Code Editor app inclusing BestNDVIMosaic core

	/*
	* @notice fully functional GEE JavaScript for Code Editor
	* @notice Generate a mosaic using pixels of the best NDVI of all images of a month
	* @notice Do it over all same months of a period of time, for example March (or August, or December)
	* @notice ... useful to remove clouds and calculate monthly NDVI stats over several years
	* @author Vu Tien Khang, licence MIT, Jan 2021
	*/
	// prepare the refrence set of images, here it's Sentinel-2 MSI: MultiSpectral Instrument, Level-1C
	var myPoint = ee.Geometry.Point(78.2875, 10.4156); // Sendurai, Tamil Nadu, India
	Map.centerObject(myPoint, 13); // close zoom around central point, zoom scale 13

kvutien / orbitdb-tuto-sh.js

Created July 8, 2021 09:57

Tutorial "Hello World" for IPFS & OrbitDB

	/*
	* create an orbitDB key-value database of pet animals
	* July 2021 - (c) Vu Tien Khang - Machu Picchu
	*/
	// import the packages
	const IPFS = require('ipfs-http-client');
	const OrbitDB = require('orbit-db');

	async function main () {
	const ipfsOptions = { }; // placeholder

kvutien / orbitdb-tuto-sh.txt

Created July 8, 2021 10:08

output of orbitdb-tuto-sh.js

	[1] 28719
	Initializing daemon...
	go-ipfs version: 0.7.0
	Repo version: 10
	System version: amd64/darwin
	Golang version: go1.14.4
	Swarm listening on /ip4/127.0.0.1/tcp/4001
	Swarm listening on /ip4/127.0.0.1/udp/4001/quic
	...
	WebUI: http://127.0.0.1:5001/webui

kvutien / wpa_supplicant.conf

Created September 6, 2021 16:10

Raspbian wpa-supplicant example

	country=LU
	ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
	update_config=1

	network={
	ssid="your wi-fi SSID"
	psk="your-wifi-password-example204877"
	}