Spectra | Satellite Imagery Analysis Workstation

Imagery source

Dataset

Start date End date

Maximum scene cloud20%

Visualization

Display

Inverse graphite exploration (metamorphic flake graphite only). Supply independently interpreted geological polygons as GeoJSON. Each polygon needs properties.screening: "low" (confirmed unfavorable exposed lithology) or "retain" (geologically prospective). Optional confidence (0–1), hostSuitability (H), and negativeEvidence (E). Unmapped areas remain transparent; obscuration is tracked separately and does not erase mapped geological evidence. Do not classify covered terrain as graphite-free.

Draw geological evidence on the map

Select an interpretation, then draw a polygon by clicking its corners and double-clicking to finish. Drawn evidence is stored in the GeoJSON field below. A polygon is not independently verified geology; choose its class only when supported by mapping. For spectral similarity, these training polygons may be in a different location from the analysis footprint.

Evidence classificationInterpretive confidence (0–1)Host suitability H (0–1)Negative geological evidence E (0–1)Spectral similarity threshold T (0–1)

No evidence polygons drawn yet.

Geological evidence polygons (GeoJSON FeatureCollection)Upload a verified geological map exported as GeoJSON, or paste its contents below. The analysis boundary is not geological evidence. Training polygons can be drawn in one area and applied to a separate target footprint.

No mapped geological evidence loaded. At least one independently interpreted polygon is required.

Choose separate Geological Classes, Geological Suitability, Spectral Similarity, or Uncertainty layers from Display. Similarity requires both high-confidence positive and negative reference regions and is NOT a graphite probability. The spectral-similarity run loads three outputs automatically: threshold T, T − 25%, and T − 50%. Spectral uncertainty remains separate. No exclusion accuracy can be claimed without independent held-out known deposits. Output: 0 = uncertain/obscured, 1 = low priority (supported by negative geology), 2 = retain for graphite investigation. This is not a probability of graphite occurrence. The server calculates P = H × (1−E) × C, with suitability S = H × (1−E). Polygons with C < 0.60 are uncertain; otherwise S < 0.30 is low priority and S ≥ 0.30 is retained. These thresholds are experimental and require local geological validation. Unmapped areas are transparent.

MinimumMaximumGamma

Opacity90%

Imagery statistics

Statistics describe the current displayed composite or selected scene over the visible map extent.

Processing scale Statistics transform

Load imagery to view scene-quality information.

Band	Min	Max	Mean	Median	Std.	Pixels

Histogram

No histogram calculated.

Contributing scenes

Inspect acquisitions used by the current filters. Select a scene to display it instead of the composite.

Sort scenes

No scenes loaded.

Scientific export

Exports preserve numeric pixel values. Display stretch, gamma, palette, and opacity are not baked into scientific GeoTIFFs.

Export content Resolution CRS Filename Cloud Optimized GeoTIFF

Direct download

Best for small areas. Earth Engine limits synchronous downloads to 32 MB and 10,000 pixels per grid dimension.

Full-resolution batch export

Exports large native-resolution products to the Cloud Storage bucket configured in Netlify as EE_EXPORT_BUCKET.

One-page PDF snapshot

Captures the current map at its true aspect ratio, including visible imagery layers, the selected basemap, geometry boundary, layer transparency, statistics, and histogram.

Report titleLocation / project nameInclude available statistics and histogramInclude interpretation disclaimer

Processing settings

Maximum listed scenes Statistics tile scale Use best-effort scale for large statistics requests Calculate statistics when imagery loads

Scientific export rule: native scale means the source collection’s nominal pixel size. It does not upsample coarse imagery to make it appear more detailed.

Draw a polygon to define the processing, statistics, and export boundary.

Lat —, Lon —Zoom 2

Spectra access

Spectra Imagery Workstation

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