Imagery
R — HH (σ°, dB)
G — HV (σ°, dB)
B — HV/HH ratio
MODIS
—
NASA GIBS · MODIS Terra + Aqua
OSI-408
1 % → 100 %
—
OSI SAF · DMI · AMSR2
ASIP
5 % → 100 %
—
CMEMS · DMI · Sentinel-1 + RCM
OSI-405
48 h displacement (5× scale)
—
OSI SAF · MetNo · AMSR2
SST/IST
−40 °C → +15 °C
—
CMEMS · DMI · AVHRR
DIDA
—
CMEMS · DMI · Sentinel-1 + RCM
Ice Charts – Concentration
1/10 open water
2–3/10 very open
4–6/10 open
7–8/10 close
9–9+/10 very close
10/10 fast ice
Ice Charts – Stage-of-Development
New ice
Nilas / ice rind
Young ice
Grey ice
Grey-white ice
First-year ice
Thin FY ice
Thin FY ice, 1st
Thin FY ice, 2nd
Medium FY ice
Thick FY ice
Old ice
Second-year ice
Multi-year ice
Glacier ice
POLARIS Risk Index · —
RIO > 0 · normal operations
RIO = 0 · marginal
RIO −1 to −5 · elevated risk
RIO < −5 · avoid
IMO MSC.1/Circ.1519 · winter values
NIC · —
DMI · CIS · —