3.4 check change information in the
field
It is difficult to interpret the object types
and change in the images without error,
because the spectrum of surface features
is very complex: the same object maybe
own different spectrum in the different
periods and with wave channels,
different object maybe have the same
spectrum in some wave channels. So
some interpretation results maybe are
error. In order to discard error and get
accurate results, investigation in the
fieldwork is very necessary. Before
investigation, the change information
must be coded, then the types, range and
location of the objects are determined
one by one in the fieldwork.
3.5 change information proceeding
After the investigation in the fieldwork,
what must be done is to rectify the
location, range and types of change
information, then calculate their areas.
3.6 Mapping
In order to describe the information at
the best and supply maps, The mapping
for landuse change dynamic monitoring
is needed. The content of mapping
include rectified images, merging
images, county boundary or higher level
boundary, planning zone boundary,
kilometer grid, location names, change
information and the codes. These
contents are arranged together by
covers.
4 examples analysis of landuse
change and urban growing
monitoring
In recent years, our group completed
several RS monitoring projects, such as
landuse change and urban growing
monitoring of Henan Province (1991-
1997), landuse change and urban
growing monitoring of Zhenzhou city,
Luoyang city(1997-1998), landuse
change and urban growing monitoring of
Xi’an city, Wuhan city(1998-1999),
landuse change and urban growing
monitoring of Beijing(1998-1999).They
are finished with the base technical route
in the context, but because of the
different of data sources , the detail steps
of every project are adjusted.
4.1 landuse change and urban
growing monitoring of Henan
Province (1991-1997)
From 1997 to 1998, our group
undertakes the project of landuse change
and urban growing monitoring of Henan
Province. This project have 24 scenes
TM images (12 scenes of 1991, 12 of
1997). Considering the duration between
1991 and 1997 is long, the technical
program is determined to classify the
TM images separately, and then extract
the change between 1991 and 1997.
In this project, rectification and
classifying are done with the images of
1991 and 1997 separately, the landuse
data (sum up to 9 types such as
agriculture land, non-agriculture land
and unutilized land) are acquired, the
urban and rural growing are the focus.
No more than five months, this project is
completed, 55 sheet maps including
classification maps and change
information maps of 18 cities in Henan
province, the statistics data and charts
are supplied, except that, the landuse
change dynamic RS monitoring system
of Henan Province is set up.
4.2 landuse change and urban
growing monitoring of
Beijing(1998-1999)
Sept 1999, group completed the landuse
change and urban growing monitoring of
Beijing. There are four scenes SPOT
pan-data of 1996, three scenes SPOT
pan-data of 1999, each scene TM5
multi-spectrum data of 1997 and 1999.
In order to utilized the high resolution
character of SPOT data and the multi-spectrum
character of TM data, the
merging technology are used to merge
the 96 SPOT data with 97 TM data, 99
SPOT with TM. Then K.L. analysis and
interpretation with eyes are used to
extract the change information. The
results include merging images of 97
and 99, change information map and
their statistics data.
All of the Projects are finished with the
Photomapper Ortho-photo production
system which is developed by our group.
