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Visibility sensor row at the Gochang Standard Weather Observatory — front left is the SIJUNG ST-01

R&D · Field test · Gochang, Korea

11 visibility sensors.
One field. Same air.

One ST-01 alongside 10 leading visibility sensors — intercomparison in the same observation row

Gochang Standard Weather Observatory, National Institute of Meteorological Sciences, KMA. Comparing readings under the same air at the same time builds the data for taking the AI video-based visibility meter to the WMO

  • 11

    Visibility sensors in total — same air, same time

  • 10

    Leading visibility sensors — including a reference transmissometer

  • 1

    SIJUNG ST-01 — AI video-based visibility meter

  • WMO

    Goal: an intercomparison record

The test bed

Gochang Standard Weather Observatory

Part of the National Institute of Meteorological Sciences, KMA. A standard observation field where many instruments run side by side under the same weather conditions

Entrance to the Gochang Standard Weather Observatory, National Institute of Meteorological Sciences, KMA
Gochang Standard Weather Observatory, National Institute of Meteorological Sciences, KMA
Outdoor observation field at the Gochang Standard Weather Observatory
Outdoor observation field
Weather instruments and Stevenson screens at the Gochang Standard Weather Observatory
Weather instruments operated side by side

The lineup

11 visibility sensors in one observation row

  • 11

    Visibility sensors in total

    Same air · same time

  • 10

    Leading visibility sensors

    Including a reference transmissometer

  • 1

    SIJUNG ST-01

    AI video-based visibility meter

11 visibility sensors lined up in the Gochang comparison row — the front-left camera is the SIJUNG ST-01 OURSSIJUNG ST-01
SIJUNG ST-01 AI video-based visibility meter installed in the Gochang comparison row

ST-01 · AI video visibility

Visibility you can see,
not just read.

AI video-based visibility meter installed in the same observation row as the 10 compared sensors

Method
Estimates the atmospheric extinction coefficient (σ) from target luminance contrast and computes the meteorological optical range (MOR) with AI
Proof
Every reading is recorded with its evidence images — verifiable afterward
In this test
Same site, same weather conditions and same time as the 10 compared sensors

ST-01 product details →

What comes next · Toward WMO

Taking AI video-based visibility measurement to the WMO — roadmap for building intercomparison data

  1. 01

    Collect In progress

    Parallel observation with the 10 sensors by day and night, in fog, rain and other weather conditions

  2. 02

    Compare

    Deviation and correlation analysis at 1-minute resolution against the reference transmissometer and the compared sensors

  3. 03

    Toward WMO

    Building an intercomparison record to the WMO Guide to Instruments and Methods of Observation (WMO-No. 8)

SIJUNG · AI visibility

Follow the data from Gochang.

A Daejeon-based research-institute spin-off of the Korea Research Institute of Standards and Science (KRISS), building AI video-based visibility meters since 2016

Testing and deployment inquiries View AI visibility meters