This Station Webcam as an Observing Instrument

Treat this station's webcam as an instrument: capture interval, field of view, and timestamp. It is not a regional directory or a Cumulus hub.

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A station webcam is a camera with a job: repeat the same view on a stated interval, carry a timestamp, and keep a field of view that can be described. It is an observing instrument that writes pictures instead of numbers. Visitors who bookmarked tnetweather.com/webcam wanted this station’s camera, not a list of other people’s streams and not a software-citation hub. This page keeps that address. No live feed is attached. No historical frame is replayed.

Two neighboring URLs answer different questions. A regional directory of many cameras is /webcams.php. A Cumulus webcam hub—an index of IDs, intervals, and privacy on the software-citation host—is cumulus.tnetweather.com/webcam. This article is the single-instrument page for the station host.

Historical context

Personal weather sites put a camera on the station because temperature without a sky felt incomplete. The usual public object was a still, often current.jpg, overwritten on a timer and shown on a /webcam page. Some operators added pan-tilt network cameras; some added only a USB still pointed at the yard or the horizon. Incoming links copied /webcam because it was the menu item for “the picture.”

The original stills, scripts, and any named camera such as a Foscam test ID are not rehosted. What the path can still teach is how to treat one camera as an instrument: interval, field of view, timestamp, and the limits of what a JPEG can claim.

This URL is not a live Mesa sky. TNET Weather does not operate that backyard camera as a current showcase.

Interval is a sampling choice

Three clocks sit on a station webcam, and they are not the same.

Capture interval is how often the camera (or the grabbing PC) writes a still. Five, ten, or fifteen minutes is a time-lapse diary. It is not video. State the cadence in text. Do not label a still “live” because the browser refreshes.

Upload interval is how often that file reaches the web host. A camera that captures every minute and FTPs every ten minutes publishes a delayed diary. The instrument’s observing interval is still one minute; the public file is ten minutes stale at worst. Print both if they differ.

Page refresh is a browser event. A meta-refresh of five seconds on a file written every fifteen minutes is a false live view. The instrument page should say “still, every n minutes,” not “streaming,” not “live cam.”

Night and winter do not change the interval policy. They change what the frame can mean: qualitative darkness, snow on a known object, a dome with rime. Those are interpretation notes. They are not a reason to advertise a faster camera.

If the file is older than one capture interval plus a small tolerance, the honest page marks it stale or withholds the picture. A broken image is better than yesterday’s noon labeled as the station view.

Field of view is the siting note

Numbers from a thermometer need a siting description. Pictures from a camera need a field of view (FOV) description. FOV here is not a marketing angle. It is the statement of what the lens is allowed to include.

A usable FOV note names:

  • Center azimuth (north sky, west horizon, toward the gauge array), or “not recorded”;
  • Approximate scene (sky only, sky plus instruments, sky plus a named distant landmark);
  • Whether the mount is fixed. A pan-tilt camera that operators can drive is a different instrument every time it moves. If public pan was disabled, say so. If it was never public, do not imply a visitor can steer it.

Do not invent a degree width. Focal length and sensor size would support a geometric FOV; without those measurements, write the scene in words. “About 180°” copied from a product box is not an observation.

Privacy is part of FOV. Aim at sky, instruments, or a horizon landmark you can name as weather context. Do not treat a neighbor’s windows, a sidewalk of identifiable faces, or audio as weather. The regional directory article covers third-party streams. This page covers one mount you are responsible for.

A mount change is a new series. If you raise the camera, pan it to a new azimuth, or replace the lens, retire the previous FOV note with a date. Keeping the same /webcam URL is fine. Pretending the view never changed is not.

Timestamp is what makes a still an observation

A still without a time is a postcard. The instrument page must state how time is written:

  • overlay clock on the JPEG, from a clock you set and check;
  • EXIF DateTimeOriginal, if the camera writes it and you trust the camera clock;
  • filename time, if the grabber names files at capture.

A single-file citation page is the record-level version of this rule. Here the rule is policy for the camera: every new still must carry a time before it is published as the station view.

Do not use the web server’s time at upload as a substitute if you can avoid it. Do not use the visitor’s browser clock. If overlay and EXIF disagree, fix the clocks; do not pick one per frame for cosmetics.

Timezone belongs next to the clock. A stamp that says 14:15 with no zone is ambiguous the moment a remote visitor saves the file.

What this instrument is not

It is not a WMO cloud observation. Cloud amount and type are trained or instrumented estimates. A consumer webcam with automatic exposure is a qualitative diary.

It is not a warning product. Lightning in a frame, a wall cloud, or water in the yard is not an NWS Watch, Warning, or Advisory. Direct hazard decisions to weather.gov or the local authority.

It is not a gallery. Archived stills, if you keep them, belong in an observation log with capture time and direction—the weather-photo index. The instrument page may link to the archive. It should not become an unlabeled pile of JPEGs.

It is not a regional webcam list. Other operators’ cameras, refresh notes, and privacy labels belong on the directory.

It is not the Cumulus hub. Cataloging several camera IDs for a software-citation site is a different URL on a different host.

Practical checklist

  • State capture interval in minutes; never label a still “live.”
  • State upload delay if it differs from capture.
  • Describe FOV as azimuth, scene, and fixed versus movable; do not invent a degree width.
  • Require a timestamp (overlay, trusted EXIF, or capture filename) plus timezone.
  • Mark stale files; do not show last week’s sky as current.
  • Privacy: sky and instruments, not neighbors; no audio.
  • Mount changes close a series; IDs and URLs may stay, the FOV note must not lie.
  • This URL serves the instrument policy, not image bytes.

Modern relevance

RTSP, browser <video>, and cloud cameras made /webcam look like a leftover JPEG page. The instrument problem did not go away. A 24-hour stream with no public interval, no FOV note, and no clock is harder to cite than a 2000s still that at least had a burned-in time. Operators who publish a sky next to a logger still owe interval, view, and timestamp.

If you play stills as a sequence, order is a separate product. A public HTML5 slideshow must honor capture time; that is not this instrument page.

TNET does not operate a webcam at this path. Anyone who followed /webcam for a picture gets the instrument rules that picture required.

TNET research bridge

A camera used as an instrument is provenance for visual observations: which mount, which interval, which time system, which view. That is the same discipline TNET applies to source identity in data sources, quality controls, and methodology. Distinguishing an observed still from a derived animation or a forecast product is how the service works. The weather-station hub groups this instrument page with other station records.

Sources