Partial Least Squares Modeling of Lunar Surface FeO Content with Clementine Ultraviolet-Visible Images - Planetary Exploration and Science: Recent Results and Advances - page 12

PLS Clementine Global Iron Map

150º 0'0”W 120º 0'0”W 90º 0'0”W 60º 0'0”W 30º 0'0”W 0º 0'0” 30º 0'0”E 60º 0'0”E 90º 0'0”E 120º 0'0”E 150º 0'0”E 180º 0'0”

N

180º 0'0”

70º 0'0”N

70º 0'0”N

FeO wt.%
0-1.8
1.9-4
4.1-5.8
5.9-7.4
7.5-9.2
9.3-11.1
11.2-13.1
13.2-15.1
15.2-16.9
17-18.7
18.8-22.7
22.8-30

35º 0'0”N 35º 0'0”N

0º 0'0” 0º 0'0”

35º 0'0”s

35º 0'0”s

70º 0'0”s

70º 0'0”s

180º 0'0” 150º 0'0”W 120º 0'0”W 90º 0'0”W 60º 0'0”W 30º 0'0”W 0º 0'0” 30º 0'0”E 60º 0'0”E 90º 0'0”E 120º 0'0”E 150º 0'0”E 180º 0'0”

Fig. 1.8 Global iron map of PLS model. Data greater than 30.0 wt% or less than 0.0 wt% are set
to NAN (not a value) in this map

1.5 Global Iron Mapping and Analysis

1.5.1 Global Iron Mapping

Applying the PLS model from Sect. 1.4.1 to Clementine DIM global mosaic,
we can obtain a lunar global iron map (Fig. 1.8 ). As shown in Fig. 1.8 ,FeO
is obviously rich in the large basins that spread in lunar nearside such as Mare
Imbrium, Oceanus Procellarum, Mare Serenitatis, Mare Tranquillitatis, etc., all of
which are known to have been flooded by large amounts of iron-rich basalt lava flow.
The histogram of global iron distribution is shown in Fig. 1.9c . Global mean FeO
abundance is 7.6 wt% by PLS model. The bimodal structure represents decoupled
iron distribution in mare and highland region. The global mode of FeO is 5.1 wt%,
corresponding to the left peak in Fig. 1.9c , and FeO abundance peak in mare is
16.9 wt%, corresponding to the right peak.

1.5.2 Comparison with Former Works

To understand more about the global FeO map derived from PLS model, we
compare our work with Lucey's band-ratio result and Lunar Prospector (LP)
(Figs. 1.10 and 1.11 ;Table 1.2 ). On a global view, the global mean of FeO
abundance of PLS model is 7.6 wt%, and the value is 7.8 wt% for both Lucey's
and LP's results. Peak values of FeO in the highland (global mode) are 5.1 wt% for
PLS model and 6.4 wt% for LP, while Lucey's algorithm derives a relatively lower
value less than 5 wt%. Peak distribution of FeO in the mare for the three model is