Monitoring of shoreline change by using satellite images in Cuulong river estuaries
Nguyen Dinh Duong, Vo Duc Tuyen
Centre of Geography and
Natural Resources
NCSR of Vietnam
Absract
In the presented paper authors describe a methodology using satellite image for shoreline change monitoring. There are submitted two methods: graphic and digital. Both methods were used and their advantages were also compared. The paper includes and FORTRAN program AutoCAD programme.
List of Appendix
Appendix No. 1. Listing of programme TRANSF
Appendix No. 2. shoreline change detection map-Cuulong
river's delta.
Introduction
One of problems. which must b solved in the coastal zone research subproject sponsored by the UNDP/ESCAP Regional Remote Sensing program is a trial application of remotely sensed data to detect and evaluate shoreline change in areas of Red river's delta and Cuulong rivers one.
Yearly shoreline change affected by river action in those areas is very great Frequent observation and timely detection of erosion areas play important role in national economy.
An application of modern survey methods to solved this problem is being carried out at the present time. One of the most successful direction is a utilization of satellite remotely sensed data especially high resolution for this purpose.
In this paper we submit shortly an experimental application of remotely sensed data in shoreline change detection mainly used methodology and gained results.
Used Materials
To evaluate exactly a shoreline change the first thing to be done is a collection of different materials the first requirement of collected data are multitemporality and second is that collected data must enable evaluate exactly, unambigously shoreline change.
Following materials should be used:
- Topographic and thematic maps in apropriate scales edited in different times.
- High resolution data for example SPOT, TM in different series
- Aerial and field trips photos
- Historic documentation
Complete acquisition of those data is very important for correct and accurate evaluation of shoreline change. We have used only LANDSAT 2,3,4 and SPOT images. we have collected satellite images that are already in Vietnam and some images supplied by ESCAP.
For this study we have used following materials (see tab .1)
- LANDSAT MSS images with resolution 80 m
- SPOT images with resolution 20 m
- SOJUZ photos with resolution 30 m
- Topographic map UTM 1: 250 000 edited in 1966.
Table 1.
| Materials |
Cuulong river's delta |
LANDSAT
MSS |
2/1/1973
31/12/1981 |
SUJUZ
KATE 140 |
1/06/1983 |
| SPOT |
7/03/1986
8/02/1987 |
Topographic
Map |
1: 250 000
edited in 1966 |
