GIS AND
GEOSTATISTICAL
APPRAISAL OF
ABUNDANCE
Authors:
h
Jung
Jung--Keuk
k Kang, Cheong
Cheongh
-Kee Park,
k Kiseong
i
Hyeong,
Hyeong,
Young Tak Ko,
Ko, Jonguk Kim, and Seungjin Yang
International Seabed Authority
Geological Model Project
FINAL WORKSHOP Dec. 15, 2009
ITEMS FOR DISCUSSION
• SUMMARY OF KRIGING
TECHNIQUES
• METHODS USED
• RESULTS
• COMPARISON WITH
INDEPENDENT ASSESSMENT
International Seabed Authority
Geological Model Project
FINAL WORKSHOP Dec. 15, 2009
KRIGING
• STANDARD METHOD OF
RESOURCE ASSESSMENT
• USES EXISTING DATA
DISTRIBUTION TO DEFINE
INTERPOLATION
International Seabed Authority
Geological Model Project
FINAL WORKSHOP Dec. 15, 2009
KRIGING: THE
VARIOGRAM
γ
International Seabed Authority
Geological Model Project
FINAL WORKSHOP Dec. 15, 2009
VARIOGRAM
FACTORS
*
Partial
Sill
Sill
Range
Nugget
0
International Seabed Authority
Geological Model Project
FINAL WORKSHOP Dec. 15, 2009
Distance (h)
SEQUENTIAL INDICATOR
SIMULATION
• SIMULATES DATA IN
UNSAMPLED AREAS
• WORKS WITH KRIGING TO
DEFINE RANGE OF
ASSESSMENT PREDICTIONS
International Seabed Authority
Geological Model Project
FINAL WORKSHOP Dec. 15, 2009
DATA REDUCTION:
STUDY BLOCKS
15°
10°
10
ISA2
ISA3
5° N
ISA1
ISA4
160°
International Seabed Authority
Geological Model Project
FINAL WORKSHOP Dec. 15, 2009
150°
140°
130°
120° W
ABUNDANCE VARIOGRAM
International Seabed Authority
Geological Model Project
FINAL WORKSHOP Dec. 15, 2009
RESULTS:
ABUNDANCE
Abundance
(kg/m2)
Mean
Std. Error
Median
Mi i
Minimum
Std. Dev.
Range
No. Points
International Seabed Authority
Geological Model Project
FINAL WORKSHOP Dec. 15, 2009
Raw Data
6.72
0.09
5.47
0 01
0.01
5.52
30 48
30.48
3,622
OK
5.29
0.01
4.93
0 01
0.01
3.17
10 04
10.04
57,819
SIS Realizations
R1
7.26
0.03
4.88
0 01
0.01
8.03
64 4
64.4
63,571
R2
6.9
0.03
4.58
0 01
0.01
7.78
60 49
60.49
63,571
R3
7.23
0.03
5
0 01
0.01
7.94
62 98
62.98
63,571
RESULTS
15°
10°
ISA2
ISA3
5° N
ISA1
ISA4
150°
International Seabed Authority
Geological Model Project
FINAL WORKSHOP Dec. 15, 2009
140°
130°
120° W
COMPARISON WITH
INDEPENDENT ASSESSMENT
Source
Included
Area
(km2 X 106)
Table 4.8
Table 4.7
47
Table 5.1
3.83
4 19
4.19
4.85
Estimated Tons (metric tons X 106)
Nod les
Nodules
21,100
30 700
30,700
27,100
Mn
Co
5,950*
8 657*
8,657
7,300
46.4*
67 5*
67.5
58.0
*Estimated using mean metal content values from Table 3.3
International Seabed Authority
Geological Model Project
FINAL WORKSHOP Dec. 15, 2009
Ni
270*
393*
393
340
C
Cu
234*
341*
341
290
SUMMARY
• RESOURCE ASSESSMENT BASED ON
CONVENTIONAL METHODOLOGY
• DATA SUBDIVIDED INTO SIMPLE
GEOMETRIES TO SIMPLIFY ANALYSIS
• SIS SIMULATION BRACKETS INDEPENDENT
ASSESSMENT
SS SS
• >20 – 30 BILLION METRIC TONS OF
NODULES IN AREAS SURVEYED
International Seabed Authority
Geological Model Project
Final Workshop
Kingston, Jamaica, December 2009