matt wilkie maphew

"Only the woman is wearing complete protective gear."

An observation my wife makes while we watch the [Bridge Breaking Competition][0]. A dozen engineers mill about, loading metal weights into buckets, and measuring when the popsicle sticks and dental floss contraptions slide, blow and explode into constituent pieces to the oohs and ahs of the delighted and dismayed onlooking crowd of grade school students and families. All of the engineers wear glasses, a few sport steel toed boots, though most have sneakers, and two hard hats are in attendance.

"Oh. That's interesting." says me, and softly led the thought to the background, there being more interesting things to think about. Crack! Crash! and another broken bridge suffers catastrophic ignomy and flies into pieces to the waiting floor and bucket. "Oh wow, that one supported 72kg!"

Applause. We leave. Time passes. Life goes on.

Four hours later I'm sitting in the emergency room clutching a fileted finger and cycling through alternating turns of waiting,

The `.bag` File Format

A .bag file (short for "Blobby/Binary/Boxed/Bagged Atom Graph") file describes a directed graph of atoms, which can be either blob (array of bytes) or cell (array of atoms) in topological order of ownership, leaves first, root last. This renders the format particularly append/overlay-friendly, as the root can be rewritten without changing the existing file or removing unused nodes.

.bag is comparable to RIFF in scope but fixes two major problems with it, namely that RIFF can only encode trees and isn't topologically ordered, requiring the use of a stack when reading it.

The format can be read as a binary stream of 64-bit words. It begins with the magic 4-character sequence .bag and a 32-bit version which must be 1 (hence .bag\x01\0\0\0 or 0x000000016761622e), and is then only followed by atoms until the file ends.

An atom begins with a header word, followed by its contents, aligned t

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.

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. Most of the academic work I would recommend is mentioned there.

	<!DOCTYPE html>
	<html>
	<head>
	<title>Javascript insert images into markdown with resize before upload</title>
	</head>
	<body>

	<pre><h2>This demo shows how you can easily add images to a markdown textarea</h2>
	You can drag and drop, paste or select images. Files other than images are discarded.
	The images are resized on the client side and inserted as Markdown inside the text.

	:: Install Leo on windows recipe by matt wilkie
	:: Requires App Installer from Microsoft Store be installed first
	:: opinionated personal preferences, adjust to suit
	::
	winget install wget
	winget install gsudo
	md c:\bin
	wget https://raw.githubusercontent.com/chocolatey/choco/blob/master/src/chocolatey.resources/redirects/RefreshEnv.cmd -O c:\bin\RefreshEnv.cmd
	sudo setx /M path %path%;c:\bin

	// https://github.com/chocolatey/choco/blob/0.10.15/src/chocolatey.resources/redirects/RefreshEnv.cmd

	@echo off
	::
	:: RefreshEnv.cmd
	::
	:: Batch file to read environment variables from registry and
	:: set session variables to these values.
	::
	:: With this batch file, there should be no need to reload command

	# Pulled from https://fossil-scm.org/home/file?name=Dockerfile&ci=trunk
	# With more build ARGs, cleaner tarball extraction, HTTPS, etc.

	ARG ALPINE_VERSION
	ARG FSLHSH
	ARG FSLVER
	ARG FSLCFG=""

	# syntax=docker/dockerfile:1.3
	# See www/containers.md for documentation on how to use this file.

	@echo off
	:: Run this on the LM server machine
	setlocal
	set _p=C:\ArcGIS\License_Manager\LicenseManager\bin

	:inbound
	netsh advfirewall firewall add rule name="ArcGIS License Manager - arcgis" dir=in action=allow program="%_p%\arcgis.exe" enable=yes
	netsh advfirewall firewall add rule name="ArcGIS License Manager - lmgrd" dir=in action=allow program="%_p%\lmgrd.exe" enable=yes
	netsh advfirewall firewall add rule name="ArcGIS License Manager - LSA" dir=in action=allow program="%_p%\LSA.exe" enable=yes

	# -- coding: utf-8 --

	import os
	import arcpy
	from osgeo import gdal


	class Toolbox(object):
	def __init__(self):
	self.label = "AddCOG Toolbox"

	# PS-BGInfo
	# Powershell script that updates the background image with a random image from a folder and writes out system info text to it.

	# run as a lower priority task
	[System.Threading.Thread]::CurrentThread.Priority = 'BelowNormal'

	# Configuration:

	# Font Family name
	$font="Input"

matt wilkie maphew

The .bag File Format

Pansharpening notes, mid-2021

Preface

The `.bag` File Format