You are using an outdated browser that does not fully support the intranda viewer.
As a result, some pages may not be displayed correctly.

We recommend you use one of the following browsers:

Full text

Fusion of sensor data, knowledge sources and algorithms for extraction and classification of topographic objects
Baltsavias, Emmanuel P.

International Archives of Photogrammetry and Remote Sensing, Vol. 32, Part 7-4-3 W6, Valladolid, Spain, 3-4 June, 1999
Original MOMS-2P Band 3 and TM infrared bands 4-5-7, dis
played as R-G-B colour composite, are shown in Figures 5(a)
and (b), respectively, together with a version of MOMS-2P spec
trally enhanced in the infrared wavelength through fusion with
TM (Fig. 5(c)). Contours and textures are highlighted, since
both are related to the spatial frequencies injected (see Fig. 5(d)).
Analogously, original MOMS-2P Band 1 (green), Band 2 (red)
and TM (visible Bands 3-2-1 displayed as R-G-B true colour) are
shown in Figure 6(a)-(c), respectively, together with a version of
MOMS-2P spectrally enhanced in the missing blue wavelength
through fusion with TM Band 1 (Fig. 6(d)).
Notice that in both cases spectral signatures -colour hues on
pictures- of the fused image (Fig. 5(c) and Fig. 6(d)) are dif
ferent from those of TM (Fig. 5(b) and Fig. 6(c)), since one
and two bands, respectively, over three straightforwardly come
from the MOMS-2P sensor which exhibits different responses
(in gains and offsets) from TM in those spectral bands which
are common to both. Furthermore, MOMS-2P bands feature also
spectral responses not perfectly overlapped to those of TM. Un
like spatial enhancement (Aiazzi, 1998; Chavez, 1991; Nunez
1999; Wald, 1997), spectral enhancement does imply a global
change in spectral information with respect to the multi-spectral
sensor having lower spatial resolution (TM in this case). The
outcome benefit is that the “enhanced” multi-spectral informa
tion, which is not a distorted version of that of TM, is available at
the spatial resolution of the multi-spectral sensor having higher
ground resolution, i.e. of MOMS-2R Waiting for quantitative
scores being devised, we may evaluate the quality of fused im
ages from the sharpness of spatial high-pass features, as well as
from their matching to contours and textures of the scene (Zhou,
1998). Therefore, preservation of multi-spectral signatures, al
though desirable, is on the whole of secondary importance for
the assessment of the quality of spectral enhancement. Its rel
evance is, however, primary when, e.g., multi-spectral data are
being merged with a panchromatic observation (Wald, 1997).