Justin Miller incanus

Pansharpening notes, mid-2021

First posted in August 2021. This is basically a snapshot of my thinking about pansharpening at that time; I’m not making any substantial updates. Last typo and clarity fixes in February 2023. December 2025 update: many ideas here, and some newer ones, are demonstrated in Potato.

Preface

This is a collection of notes on how I’ve been approaching convolutional neural networks for pansharpening. It’s an edited version of an e-mail to a friend who had asked about this tweet, so it’s informal and somewhat silly; it’s not as polished as, say, a blog post would be. It’s basically the advice I would give to an image processing hobbyist before they started working on pansharpening.

If you want a more serious introduction, start with the literature review in [Learning deep multiresolution representations for pansharpening](https://ar

Guide: Run FreeBSD 13.1-RELEASE for ARM64 in QEMU on Apple Silicon Mac (MacBook Pro M1, etc) with HVF acceleration (Hypervisor.framework)

This guide was adapted from https://gist.github.com/niw/e4313b9c14e968764a52375da41b4278#running-ubuntu-server-for-arm64

Running FreeBSD 13.1-RELEASE for ARM64

Install Xcode from App Store or install Command Line Tools on your Mac running on Apple Silicon.

ANSI Escape Sequences

Standard escape codes are prefixed with Escape:

Ctrl-Key: ^[
Octal: \033
Unicode: \u001b
Hexadecimal: \x1B
Decimal: 27

Installing Python 3.7.4 on Raspbian

As of July 2018, Raspbian does not yet include the latest Python release, Python 3.7.4. This means we will have to build it ourselves, and here is how to do it.

Install the required build-tools (some might already be installed on your system).

	#!/bin/sh

	if [ ! -z "$*" ]; then
	echo "this is ~/bin/df, use /bin/df"
	exit 1
	fi

	protect=`mount \| grep -v "read-only" \| grep "protect" \| cut -f 3 -w`
	nosuid=`mount \| grep -v "read-only" \| grep "nosuid" \| cut -f 3 -w`

	/* Heap based virtual machine described in section 3.4 of Three Implementation Models for Scheme, Dybvig
	*/

	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <ctype.h>
	#include <assert.h>

	char token[128][32];

	#!/usr/bin/env bash
	alias icloud_tabs='sqlite3 -header -csv ~/Library/Safari/CloudTabs.db "select ctd.device_name, ct.title, ct.url from cloud_tabs as ct inner join cloud_tab_devices as ctd on ctd.device_uuid = ct.device_uuid order by device_name asc, position asc"'

	# Output to CSV file:
	icloud_tabs > icloud_tabs.csv

	# Unique CSV:
	sort -u icloud_tabs.csv -o icloud_tabs_unique.csv

	# Merge CSVs:

	import json
	import sqlite3
	import zlib

	# ~/Library/Safari/CloudTabs.db
	# Ref: https://www.reddit.com/r/mac/comments/89qx5n/iphone_safari_tabs_into_text_list_via_icloud/
	db = sqlite3.connect('CloudTabs.db')

	tabs = []

	# Adjust the following variables as necessary
	REMOTE=origin
	BRANCH=$(git rev-parse --abbrev-ref HEAD)
	BATCH_SIZE=500

	# check if the branch exists on the remote
	if git show-ref --quiet --verify refs/remotes/$REMOTE/$BRANCH; then
	# if so, only push the commits that are not on the remote already
	range=$REMOTE/$BRANCH..HEAD
	else

	diskutil list
	diskutil unmountDisk /dev/disk2
	diskutil eraseDisk FAT32 SANDISK /dev/disk2