Geology Reference
In-Depth Information
2
9+
28
41
1
3X
9+
442
541
54X
3
9+
253
541
54X
Figure 11.8
Radarsat‐1 image acquired on 6 November 2003 in Baffin Bay, with CIS image analysis polygons
overlaid. The egg code for the center polygon (boundary in cyan color) indicated 100 total ice concentration (9+),
composed of 50% gray‐white ice, 40% gray ice, and 10% new ice, [
Shokr
, 2009].
They are also a source of information that feeds into the
higher‐level product of the daily ice analysis charts.
Figure 11.9 is another example of the image analysis
chart generated from analysis of two consecutive frames
from the same Radarsat‐1 orbit. The image that matches
the bottom of the chart is shown in the inset. It shows the
southern area of the Gulf of St. Lawrence on 17 February
2000. Colors in the chart represent ranges of concentra-
tion of ice thicker than 15 cm (the color code is explained
in details in
MANICE
[2005]. Blue represents concentra-
tion (
C
) less than one-tenth, green for 1 <
C
<3, yellow for
4 <
C
<6, orange for 7 <
C
<8, and red for 9 <
C
<10. The
black color represents fast ice. This code is designed to
highlight concentrations of ice types that are potentially
dangerous for ship navigation. The stars indicate that the
ice thickness is less than 15 cm. Blue stars indicate pre-
dominance of ice that is less than 10 cm in thickness, and
while red stars indicate predominance of ice thickness
ranging from 10 to 15 cm.
addition to auxiliary data such as airborne reconnaissance
data, ship reports, weather reports, and other satellite obser-
vations and retrievals including ice concentration from pas-
sive microwave sensors. While image analysis charts are
generated at the fine resolution of Radarsat images (100 m),
the daily ice analysis charts are generated at 5 km resolu-
tion. Unlike the image analysis charts, which are generated
when images become available, daily ice charts are gener-
ated regularly on a daily basis during the sea ice season for
specific areas of marine activities in Canadian waters.
Charts for areas outside of Canadian waters are produced
upon request from specific clients. It should be noted that
daily ice charts contain less details pertaining to the ice
types, their concentrations, and forms than the image anal-
ysis charts. For that reason they can only be used for a
short‐term planning of marine navigation.
11.2.5. Regional Ice Charts
The regional ice charts are created through the manual
analysis of in situ, satellite, and aerial reconnaissance
data. They incorporate information from the daily ice
analysis charts. Satellite imagery is collected over a few
days in order to have complete coverage of the region.
These charts are produced for all regions shown in
11.2.4. Daily Ice Analysis Charts
Daily ice analysis charts are computer generated using
mapping and image analysis tools available in ISIS. This
product is compiled from the image analysis charts in
