Table 1.

JPSS Accuracy Requirements (Threshold and Objective as Listed in Version 2.7 of the JPSS Level 1 Requirements Supplement) and Estimated Performance Based on NASA VIIRS Science Team Evaluations To-Date^a

EDR, IP, or ARP	Threshold	Objective	Estimate (Evaluation Scenario)
Land Surface Temperatureb	1.4 K	0.8 K	∽ 1.0 K (dense vegetation and water)
			> 2.5 K (semiarid, seasonally varying landscapes)
Surface Reflectancec	± (0.01 + 10%)	± (0.005 + 5%)	≤ 0.015 (dense vegetation and dark surfaces)
			> 0.015 (bright surfaces)
Surface Albedo	0.08	0.0125	> 0.078 (CEOS LPV sites and desert sites)
Vegetation Index (TOA NDVI)	0.05	0.03	< 0.030 (nadir view over Western Hemisphere versus MODIS Aqua)
Vegetation Index (TOC EVI)	0.05	N/S	< 0.030d (nadir view over Western Hemisphere versus MODIS Aqua)
Active Firese	[1.0, 5,000 MW]	[1.0, 10,000 MW]	N/S
Surface Typef	70% PCT	80% PCT	∽ 70% PCT (IGBP Classes 0–5, 10, 12–13, 15–16)
			< 70% PCT (IGBP Classes 6–9, 11, 14)
Snow Coverg	90% PCT	90% PCT	∽ 90% PCT (midlatitude and high-latitude regions)
Ice Age	70% PCTh	90% PCTh	> 70% PCTi (polar regions, all seasons)
			< 70% PCTh (polar regions, all seasons)
Ice Concentration	N/Sj	N/S	Good agreement versus MODIS sea ice extent (polar regions, all seasons)
Ice Surface Temperature	1.0 Kelvink	N/S	< 0.2 K (versus MODIS IST)
			< 0.5 K (versus KT-19 observations, Ice Bridge cal/val campaign)

^aNote that additional specifications typically apply to each product, such as revisit time, coverage, long-term stability and mapping, precision, and uncertainty; for brevity, these are not listed here. Further, each product has an associated set of exclusion conditions (e.g., high solar zenith angles) for which its specifications are relaxed. N/S = No value specified. PCT = Probability of correct typing.

^bResults are based on IDPS MX6.2 build, after a look-up table update was implemented.

^cNote that performance is dependent on both the spectral band and magnitude of the reflectance (e.g., increased surface brightness results in a multiplicative error of 5%).

^dWith EVI gain adjusted to 2.5.

^eFire Radiative Power (FRP) measurement range threshold requirement. The high end of the FRP measurement range threshold requirement (5000 MW) is based on current design capabilities (i.e., the present 634 K saturation specification for the VIIRS M13 Band) and the recommendation of the NOAA-NASA Land Science Team. Quantitative assessment of ARP product is pending on availability of quality reference data, primarily from airborne measurements.

^fSeventeen-class IGBP classification.

^gApplies only to snow/no-snow classification.

^hIce-free, new/young ice, all other ice.

ⁱIce/ice-free classification.

^jVIIRS produces a sea ice concentration IP in clear sky conditions, which is provided as an input to the Ice Surface Temperature calculation.

^kUncertainty requirement for Ice Surface Temperature.