Beyond the library, Remote Miner lets you read spectra straight off a rendered scene: right-click a pixel and the platform samples that pixel’s raw bands and plots its reflectance curve. You can gather up to 100 points at once, compare them, match them against the reference library, and export both the data and the chart.
Sampling a point #
With a spectral image layer active on the Globe, right-click the spot you want and choose Plot Spectral Signature. A coloured marker drops at that pixel and the Spectral Signatures viewer opens with its curve.
- Works on optical instruments — multispectral and hyperspectral alike (the curve is richest on hyperspectral). Radar/SAR layers aren’t eligible, so the option won’t appear for them.
- If no suitable layer is active, the platform prompts you to load a spectral image first.
- Each map marker has a small menu — Visualize (bring it back into the viewer), Delete, and Copy coords.
You can keep sampling up to 100 points. At the limit, remove a point from the viewer to add another.
The spectral viewer #
The viewer (reopen it any time from the Spectra pill) has a point list on the left and the chart on the right.
Map points. Every sampled point is listed and can be filtered by name. For each one you can:
- Rename it (click the title),
- Recolour it,
- Show / hide it on the chart,
- Remove it — or Clear All to empty the session.
The chart. Reflectance (%) is plotted against wavelength (nm). A chart-type selector offers:
- Line and Bar — the raw curve.
- Continuum — continuum-removed depth, to emphasise absorption features.
- Derivative — the rate of change, to pick out feature edges.
- Heatmap — every signature as a row, wavelength across the columns, colour = reflectance (a compact way to compare many curves).
Use Stack with a Step offset to fan overlapping curves apart, wheel or drag to zoom (with Reset), or set the axis min/max by hand.
Comparing and matching #
- Overlay — all visible points plot together automatically; use Select all / N selected to focus on a subset (the rest are hidden).
- Add reference signatures — pull saved signatures from your library onto the same chart with Add saved signatures; they’re drawn as dashed lines for easy contrast.
- Match library — on any point, Match library ranks the reference library against it by spectral angle (SAM), shown in degrees where lower means a closer match — a quick way to put a name to an unknown pixel.
Saving and exporting #
- Save a point to your library — Save Spectral Signature (or the per-point Save spectrum) opens the Name / Type / Class / Origin form and stores it alongside your other signatures. The plotting session itself is temporary, so save (or export) anything you want to keep before you close or Clear All.
- Download the data — export the spectra as CSV, TXT (tab-delimited) or GeoJSON. Each is a long-format table of
name, class, type, origin, latitude, longitude, wavelength, reflectance(GeoJSON also carries each point’s map location and nests the full curve). If you’ve selected specific points, only those export; otherwise all visible points do. - Export the chart — Export PNG saves the current plot as an image.
Sampling, comparing, matching and exporting spectra don’t consume any credits.
Related #
- Manage what you’ve saved: The Spectral Library and Adding & Managing Signatures.
- Turn a signature into a full-scene map: Creating Insights (Distance Analysis / Wavelength Analysis).