International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004
Figure 3. Forest type map with 2 types including
Amygdalus scoparia and others
6. Conclusions
In this research inspite of utilizing precise digital
processing techniques and using an accurate ground
truth map, the results achieved were modest. A
conclustion to be made from this investigations is that
low canopy area (up to 4596) strengthens the role of
bare soil and background cover in the reflection
achieved.
Similar researches confirm this too (Hurcom &
Harrison, 1998; Todd & Hoffer, 1998; Schmidt &
Karneili, 2001). On the other hand there are many
forest types in the study area which they change
gradually. Therefore there is not any distinct boundary
between the types and mixed pixels will increase.
All of the aforesaid instances make spectral similarity
between density classes and forest types and this
causes misclassification. About Amygdalus scoparia
type which was separated from the other types more
favourably, it can be mentioned that in this forest
species, lack of leaves or few numbers of them and
needle phylla, make the light to influence into the
crown. Furthermore, all of the phylla are green, thus
in this type in comparison with the other types, by the
same canopy area percent, more chlorophylls will be
at the sensor field of view. On the other hand this type
was distributed completely far from the other ones
and the background reflection is mostly related to the
bare soil because the background vegetation is very
poor. So that it can be said that it is possible that the
satisfactory results of this type indeed indicated
desirable separability of the soil and not the forest
type.
On the basis of the results, it must be noticed that in
such a region, ETM- data do not show a heigh
potential for forest type mapping, although this
conclusion needs further validation. The other
satellites data with higher spatial resolution like
SPOT, IRS-LISS and ASTER and also improved
analysis methods are consequently recommended.
Acknowledgement
Thanks go to the vice-chancellor of University of Tehran for
providing funds of this research.
*p
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