Base map revision using high resolution satellite data
Results
The project area is mainly characterized by flat terrains located in the Central Plain. Base maps of this project have never been revised since the first edition in 1969. Both new features and the changes could be added onto the existing base maps such as roads. Irrigation canals, reservoirs, deforestation area that has become agricultural land and residential area. The utilization of high-resolution satellite images has proved to be a very effective means for map updating for this area and could provide map users with more up-to-date and useful information.
At the time of writing (August 1990), RTSD has assigned ground survey party to evaluate positional mapping accuracies.
Conclusions and Recommendations
In general, aerial photographs are primary data for as revision. Satellite data will be utilized in particular cases such as when information on the maps is out of date or when there are is urgent requirements from the users. It is most beneficial to use both aerial photographs and satellite images in a complementary approach.
Methodology for updating has to be based on the existing equipment and other resources. However, it should be pointed out that remote sensing technology is being developed rapidly with high competency. Investment for expensive equipment should be considered carefully in term of benefits. Simple methods using expensive equipment such as visual interpretation by an experienced interprets and appropriate type of images can also provide good results.
Acknowledgements
The author wishes to acknowledge RTSD colleagues for that consistent cooperation. My thanks are also extended to the Remotes Sensing Division of National Research Council of Thailand for the support provided in this project.
References
- Turner, A.M. and D.R. Stafford, (1986) Operational Revision of National Topographic Maps Using Landsat Images. The Canadian Experience. Proceedings of the Commission it Symposium on Mapping & Modern Imagery, ISPRS vol. 26, part 4, Edinburgh.
- Gregory, A.F. and Moore, H.D. (1986) Economical Maintenance of National Topographic Data Base Using Landsat Images Photogrammetric engineering and remote sensing vol. 52 No. p 519-524.
- Fleming, E.A. (1982) Topographic Map Revision Using Satellites Imagery. Prepared for the second National Workshop is Engineering Applications of Remote Sensing, Edmontes Alberta.
- Aisanont, Col. S (1988) Topographic Map Updating Using SPOT Imagery Abstracts of the Mid-Project Seminar under the CIDA-Thailand Landsat Project, January, Thailand.
- Aisanont, Col. S (1988) Base Map Updating in Thailand Using SPOT Satellite Imagery. Proceedings of the Ninth Asl Conference on Remote Sensing Vol. 7 Session D.
Figure 1 Panchromatic, level 2 (Geocoded, Precision corrected) SPOT images used.
Table 1 Information of 24 base map.
| No | 1850,000 BASE MAPS | EXISTING MAP DATA
(YEAR) |
| SHEET NUMBER | SHEET NAME |
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
|
4837 i
4837 ii
4837 iii
4837 iv
4838 i
4838 ii
4838 iii
4838 iv
4837 i
4937 ii
4937 iii
4937 iv
4938 i
4938 ii
4938 iii
4938 iv
5037 i
5037 ii
5037 iii
5037 iv
5038 i
5038 ii
5038 iii
5038 iv
|
BAN LAM HOEI
BAN LAT YA
AMPHOE SAI YOK
BAN KANG RIANG
KHAO PHU TOEI
BAN NONG PRU
AMPHOE SI SAWAT
BAN PHUNG
AMPHOE U THONG
BAN THUNG KHOK
CHANGWAT KANCHANABURI
AMPHOE BO PHLOI
BAN NONG KRATHUM
BAN NONG CHOK
BAN KRAP
BAN NA TA PIN
AMPHOE PRAK HAI
AMPHOE LAT LUM KAEO
AMPHOE BANG LEN
HANNGWAT SUPHAN BURI
CHANGWAT SING BURI
CHANGWAT ANG THONG
AMPHOE SI PRACHAN
AMPHOE DOEMBANG NANGBUAT |
1969
1969
1969
1969
1969
1969
1969
1969
1969
1969
1969
1969
1969
1969
1969
1969
1969
1969
1969
1969
1969
1974
1969
1969
|
Table 2 original Panchromatic SPOT images.
| NO. |
K - J |
SENSOR |
ACQUIRED |
VIEW ANGLE |
1
2
3
4
5
6
7
8
9
10 |
259 - 320
259 - 321
260 - 320
260 - 321
260 - 322
261 - 320
261 - 321
261 - 322
262 - 321
262 - 322 |
HRV 2
HRV 2
HRV 2
HRV 2
HRV 2
HRV1
HRV1
HRV 2
HRV1
HRV 2 |
1989-05-08
1988-07-10
1988-12-24
1988-12-24
1988-12-24
1988-12-24
1988-12-24
1988-12-24
1989-01-19
1988-12-19 |
-1.94
13.10
-5.95
-5.95
5.95
-2.30
-230
-595
1.94
-5.95 |
Table 3 Multispectral SPOT images, level 1B (full scene, bulk corrected)used.
| NO. |
K - J |
SENSOR |
ACQUIRED |
VIEW ANGLE |
1
2
3
4
5
6
7
8
9
10
11 |
259 - 321
259 - 322
260 - 320
260 - 321
260 - 322
260 - 320
261 - 321
261 - 322
262 - 320
262 - 321
262 - 322 |
HRV 2
HRV 2
HRV 1
HRV 1
HRV 1
HRV 2
HRV 2
HRV 2
HRV 2
HRV 2
HRV 2 |
1988-11-12
1988-11-12
1989-05-08
1989-05-08
1989-05-08
1989-01-19
1989-01-19
1989-01-19
1988-12-03
1988-12-03
1988-12-13 |
6.32
6.32
2.60
2.60
2.60
-1.31
-1.31
-1.31
10.38
10.38
24.77 |
