celoyd

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.

adamjmcgrath

auth0-react static getAccessToken method

There are many use cases to use getAccessTokenSilently outside of a component (for example, in an Axios Interceptor or an Apollo Client).

It's tempting to ask for the option to pass an Auth0Client instance into the Auth0Provider so that its getTokenSilently method can used outside of the context of a component, eg.

const client = new Auth0Client();
export const getAccessToken = () => client.getTokenSilently();

zapisnicar

How to create Telegram Bot and send messages to your group

1. Create Telegram bot:

   Search for user @BotFather in Telegram app. Type /help in BotFather chat and wait for the reply. Type in the chat:

   /newbot

or select /newbot command from Help text. Answer few setup questions:

aws-john

# Adapted from https://docs.aws.amazon.com/pinpoint/latest/developerguide/send-messages-sms.html
# Disclaimer: this is sample code for demonstration purposes only

import boto3
from botocore.exceptions import ClientError

# The AWS Region that you want to use to send the message. For a list of
# AWS Regions where the Amazon Pinpoint API is available, see
# https://docs.aws.amazon.com/pinpoint/latest/apireference/
region = "us-west-2"

harpone

class GCSDataset(Dataset):
    """Generic PyTorch dataset for GCS. Streams data from GCS and (optionally) caches to local disk.

    """

    def __init__(self,
                 bucketname=None,
                 path_list=None,  # TODO: list bucket/path contents if None
                 target_list=None,
                 transform=None,

vincentsarago

Let's see how much it will cost to translate all the Sentinel-2 JPEG2000 to COGs using AWS Lambda https://github.com/developmentseed/sentinel-2-cog (Note at this scale AWS Lambda might not be the cheapest option).

How many S2 scenes do we have on AWS?

$ curl https://sat-api.developmentseed.org/collections/sentinel-2-l1c/items | jq -r '.meta.found'
5 633 438

Lambda config

piskvorky

#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (C) 2019 RARE Technologies s.r.o.
# Authors: Radim Rehurek <radim@rare-technologies.com>
# MIT License

"""
Find private/shared memory of one or more processes, identified by their process ids (PIDs).

soumith

conda uninstall --force pillow -y

# install libjpeg-turbo to $HOME/turbojpeg
git clone https://github.com/libjpeg-turbo/libjpeg-turbo
pushd libjpeg-turbo
mkdir build
cd build
cmake .. -DCMAKE_INSTALL_PREFIX:PATH=$HOME/turbojpeg
make
make install

soulmachine

First of all, please note that token expiration and revoking are two different things.

1. Expiration only happens for web apps, not for native mobile apps, because native apps never expire.
2. Revoking only happens when (1) uses click the logout button on the website or native Apps;(2) users reset their passwords; (3) users revoke their tokens explicitly in the administration panel.

1. How to hadle JWT expiration

A JWT token that never expires is dangerous if the token is stolen then someone can always access the user's data.

Quoted from JWT RFC:

jeroen

# Globals
repos <- 'https://cloud.r-project.org'
pkgdata <- available.packages(repos = repos)
pkgs <- row.names(pkgdata)

# On success
make_callback <- function(i, url){
  function(res){
    if(res$status == 200){
      buf <- rawConnection(res$content)