SVC Field Notes

A single-file web app for recording SVC spectroradiometer file numbers against a pre-planned measurement list.

The point of it: the operator should almost never type a file number. The app tracks the counter, the operator confirms or says what went wrong.

Using it

Copy svc-fieldnotes.html onto the phone or tablet and open it from local storage.

1. Load the day's plan CSV. It needs FileNum, Date, Prefix, Subfolder and comments columns - a missing one is the app's only hard stop.
2. Enter the date, prefix, subfolder, and the first file number the instrument will write.
3. Walk the plan. CONFIRM assigns the big number on screen to the current row and moves on.

Button	When
CONFIRM	The scan you just took belongs to this row
OVERWRITE	Same button on a row that already has a number - reassigns it deliberately
WR	White reference taken. Confirm which file number it is - that step is the reconcile
DISCARD	The scan was junk. One tap: burns the number, stays on the row
NOTE	Free text into the comments column
UNDO / REDO	At least 20 actions deep, and undo leaves no trace in the log
PREV / NEXT	Move the cursor only - for skipping a row and coming back
NEXT FILE (the big number)	Tap to reconcile against the instrument any time

Dark mode is on the opening screen and in the ☰ menu mid-session. Light is the default in sunlight, and the choice is remembered separately from the session.

Set the device's screen timeout to never before a session.

Reconcile

The highest-value thing in the app after CONFIRM. Read the next file number off the instrument, type it in. If it matches, that is two seconds well spent. If it does not, the app shows the gap in words and offers to log the missing numbers as discards and resynchronise.

It prompts whenever a part-filled plan is loaded, and taking a white reference is itself a reconcile - the app asks which file number the WR is rather than assuming, since WRs get re-taken too. Anything skipped on the way is logged as discards.

Getting the data out

The ☰ menu holds Export. It writes three files, always with a fresh timestamped name so nothing ever overwrites anything:

• Plan CSV - the input file with FileNum and comments filled in, and WRNum/Date/Prefix/Subfolder written only where they change. Drops straight into the QC pipeline.
• Event log CSV - one row per action, including every discarded number.
• Session file - full state, to resume on another device.

Each of those offers a download link and a plain text box. On old tablets the text box is the one that works - select it, copy, share it out however you can.

The app autosaves to localStorage after every action and offers Resume or Start Fresh next time it opens. It never resumes or discards silently. Still, export at the end of each plate: the OS can clear local storage whenever it likes, and the app nags for exactly this reason.