, hot ’ ^erefore
r °wn soil is the
™ ate ' s clammy
0,1 the plateau
therefore it
'PS alpine
mes drier
humus becomes
Preforms
and northwest of
**• It covers the
to
an ? lake special
lished in 1976 to
This area has j
:me Iy scattered,
island locates at
liter in the north
and semi-desert
hit. The Kunlun
m resolution in
idy data for this
In order to have both high spatial resolution and multispectral
feature, the panchromatic image with high spatial resolution and
multispectral image were merged using PCA transformation, i.e.
using the high spatial resolution image to instead the first
principal component after multispectral image transformation.
The true colour image could not be fused due to the lacking the
Blue band in SPOT5. The 4, 3, 2 bands of the fusion image
were used to fuse the pseudo colour image according to the
purpose of the interpretation (see Figure 2).
Image interpretation
3.3.1 Classification system
The standard for terrain classification of the interpretation
results is the 1:50000 topographic mapping schema.
3.3.2 Interpretation method
The interpretation mainly uses visual interpretation, using the
image (colour) hue, shadows, size shape, texture, pattern,
location and combination to interpret elements, and ultimately
determine the feature types.
Ground object types
Pastoral tents: The recognition of the pastoral tents mainly based on their shape and
size on the image. They are difficult to be recognized on the 10m resolution
multispectral image. However, on 2.5m resolution panchromatic image, the tents have
regularly hexagonal shape and therefore they could be clearly recognized, but the
residence month is uncertain.
iretation process,
th of the original
on. therefore the
: irst, the images
ige to unify them
the wo images
tion. In practical
September. 1999
olynomial model
n model, and the
in resampling to
results show that
0 Hed within one
iodel used in the
model, and the
j in resampling'
, n e pixel (Meng,
Normal houses: The extraction of normal houses depends on their shape, size, texture,
pattern and combination to judge. Similar to the pastoral tents, they are difficult to be
recognized on multispectral image. But on panchromatic image, these houses are
shown as regular polygons with the regular shape and clear texture; therefore they can
be clearly recognized.
Roads for transporting: The interpretation mainly depends on their shape. On
multispectral image, the roads are fuzzy and sometimes are mixed with the
background; therefore they can’t be completely extracted. While on panchromatic
image, they are clear and can be distinguished from the background.