Flames of Desire

001326310070

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001358750072

Fruit Paradise

Night Flower

Research, geospatial work, hardware, or the space in between.

Satellite data, turned into decisions people can act on.

Ricky Winarko

The platform responders and researchers use to find, request and track SAR imagery over a disaster. It searches the Sentinel-1 acquisition plan, dispatches processing jobs to Airflow, and surfaces GDACS events as they happen — Django and Celery behind a CesiumJS globe.

SARFinder

A solar-powered LTE field node that measures water depth in a rice paddy, and the app that turns it into an irrigation decision. Custom PCB, ESP32-S3 firmware, MQTT backend, React dashboard and a Flutter app farmers install themselves by scanning a QR code.

PadiHAT — water in the paddy, measured from orbit and from the mud

Can ESA's P-band BIOMASS mission see flooding in Javanese rice paddies? Scored honestly against ground water-level pipes and a label-shuffle null, mostly no — and the reasons why turned out to be the interesting part.

BIOMASS Demak — flood detection at 435 MHz

An Android app for UHF RFID handhelds that turns a jewellery stock-take into a walk past the shelves. Licensed per device against its own key server, and built to keep counting when the shop's Wi-Fi does not reach.

Jewelsoft RFID Handheld

Satellite remote-sensing tutorials that run in a browser tab. Students open a Codespace and are working with real PACE, SWOT and Sentinel data in minutes, with no environment to install and no way for a course update to overwrite their work.

ES4304 Eyes on Earth

Finding out what is on in a city means scraping a lot of places politely. Ember does it from a fleet of small edge workers that submit signed batches to a Django backend, which stays the single system of record and publishes nothing without review.

Ember — event discovery on a fleet of Raspberry Pis

ESP32 firmware, a Django API and a Flutter app: soil moisture every five minutes, a pump that can be triggered from a phone or left on a schedule, and BLE provisioning so a new device never needs the Wi-Fi password hardcoded.

Plant IoT — a plant that waters itself

A long-distance companion device: messages and photos sent through a Telegram bot appear on a Raspberry Pi e-paper frame, alongside Kkomi — a one-eyed virtual pet whose mood quietly decays until somebody looks after it.

PaperHeart

Getting terabytes of ALOS-2 scenes onto a cluster is nobody's research. This turns it into one command: parallel FTP and SFTP transfers, optional PBS or Slurm submission, extraction into the layout the processors expect, and registration with the scene catalogue.

Ultimate Downloader

A Next.js platform built for Enitio, NTU's freshman orientation program — points tracking, photo galleries, and gratitude messages for participants. A middleware layer syncs and caches points data from Google Sheets; deployed on Vercel.

Enitio Website

A web platform serving the Earth Observatory of Singapore's remote-sensing products, built as part of my work there.

EOS-RS — Earth Observatory of Singapore

## Ultimate Downloader

SAR processing starts with a large, dull, failure-prone download. This tool makes that step unattended.

### Transfers

FTP and SFTP, with password or SSH-key auth and saved credential profiles for the servers used often. Transfers run in parallel threads with live progress, speed and ETA, whole directories can be pulled recursively, and an interrupted run resumes by comparing local against remote sizes rather than starting over.

### Then the part everyone forgets

A finished download is not a usable scene. Archives are extracted and organised into the `P{path}/F{frame}` tree the downstream processors expect, and each extracted scene is registered with the satellite scene catalogue API — so what arrives on disk is already discoverable, not something a person has to file.

### Where it runs

On a cluster it submits itself: the same download can be dispatched as a PBS or Slurm job instead of held open in a terminal, with Slack notifications on status and completion. For exploring an unfamiliar archive there is an interactive mode with a tree view and tab completion.