Imagery
R — HH (σ°, dB)
G — HV (σ°, dB)
B — HV/HH ratio
True color — Sentinel-2 L2A
MODIS
—
NASA GIBS · MODIS Terra + Aqua
OSI-408
0 % → 100 %
—
OSI SAF · DMI · AMSR2
ASIP
0 % → 100 %
—
CMEMS · DMI · Sentinel-1 + RCM
OSI-405
48 h displacement (5× scale)
—
OSI SAF · MetNo · AMSR2
SST/IST
−50 °C → +20 °C
—
CMEMS · DMI · AVHRR
AMSR3 (L2)
0 % → 100 %
EUMETSAT OSI SAF · GOSAT-GW · OSI-410-g
DIDA
—
CMEMS · DMI · Sentinel-1 + RCM
Ice Charts – Concentration
Open water
1/10
1–3/10 very open
4–6/10 open
7–8/10 close
8–9+/10 very close
10/10 consolidated
Ice Charts – Stage-of-Development
Ice free
Brash ice
No stage
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
Undetermined
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 · —