Part 13

Reference

The three lines that settle an argument, every refusal and what to do about it, and a glossary.

The three lines that settle an argument

Before any number leaves the studio, read these three.

Line	Where	What it settles
Posture	Layer card, result badge	What the number is licensed to support. See Posture.
Coverage	Result panel	What fraction of the ground was measurable, and what the percentages are a fraction of. See The Result panel.
Provenance	Result panel	Which engine, which version, which granule, and when.

Refusals, and what to do about each

The studio declines rather than guessing. Each refusal names its reason on screen. This is what each one means.

You see	It means	Do this
Limited by band width	The layer computes, but this sensor cannot separate it from a neighbouring layer.	Use EMIT if the separation matters, or treat the pair as one measurement.
Not measurable	Fewer than 100 valid pixels, or below the fraction needed to summarise the area.	Nothing. Another date will help, because this is weather rather than terrain. The pixels that did see ground are still mapped.
Not scored	Too much of the area is hidden by cloud, vegetation or low signal for a score to describe anything.	Re-run on a clearer acquisition.
Statistics cover the bounding box	The summary numbers were computed over the rectangle enclosing your boundary rather than over the boundary. Identical on a drawn rectangle; material on an uploaded boundary or a corridor.	Re-run the analysis. The map and the layers are correct either way; only the summary changes.
No comparison possible	Only one analysis exists over this area on this sensor and engine, or every one is a re-run over a single acquisition.	Run the same layers on a second acquisition.
This layer needs a paid plan	The layer's method is editorial, fitted, or a library fit.	The message names the plan that unlocks it.
Outside the served region	Evapotranspiration covers the conterminous United States for now.	Nothing yet.
A mismatched wire will not latch	A workflow port takes one payload type and you offered another.	The input names the type it accepts. Insert the step that produces it.
Verification required	Image orders need a verified workspace.	Complete verification from Settings before returning to the Order Desk.

Glossary

Term	Meaning
AOI	Area of interest. The boundary everything is scoped to.
Granule	One satellite acquisition, identified by a string encoding the sensor, the date and the orbit.
Band depth	How deep an absorption is at a given wavelength, once the surrounding continuum has been removed.
Continuum removal	Dividing out the broad shape of a spectrum so that a narrow absorption can be measured against a flat baseline.
Fit quality	How well a library spectrum explains a pixel, from 0 to 1.
Mapped area	The ground a statistic was actually computed over, after masking. Always smaller than the imaged area.
COG	Cloud-optimised GeoTIFF. A georeferenced raster a GIS can open directly.
dNBR	The difference in Normalised Burn Ratio between two dates, classified on published thresholds into burn severity.
Enhancement	For a matched-filter product, how far a pixel sits above the scene's own background, in the units of the target gas.
Sensitivity	The smallest enhancement distinguishable at that pixel, at one standard deviation. A per-pixel property rather than a constant.
Posture	What kind of claim a layer's number supports. Seven exist; see part four.

Where to go next

The How it works panel and the five guided tours are always one click away at the foot of the rail. See part one.
Lisaris will explain any result you have open and price an analysis before you run it. See part two.
Every layer card carries its own limits and validation text, unedited. See part four.
If you are integrating rather than clicking, the API reference is linked from Settings › API keys.