Multi Seasonal Analysis of Optical Data for Agriculture in Mt. Pinatubo Area
Marcelina M. Dumayac*, Genya Asito**, Nobuyuki Mino**,
Shigeo Ogawa** and Ma. Arlene M.Evangelista ***
*National Mapping and Resources Information Authority
fort Andres Bonifacio, 1201 Makati City, Philippines
**Natioonal Institute of Agro-Environmental Sciences
3-1-1 Kannondai Tukuba Japan
*** Bureau of Soil and water management,
Elliptical Rd. corner Visayas Avenue, Diliman, Quezon City, Philippines
Abstract
In this paper, the authors developed a methodology t quantitatively estimate vegetation cover rations using multiple types of optical sensor data. these data were used to analyze the effects of the eruption form Mt. Pinatubo, the Philippines from 1991 ( eruption time ) to the present (1996). through satellite image analysis, changes in vegetation damage over time is assessed from the decrease in vegetation cover due to volcanic ash ands mudflows. A summary of finding and observations follows.
- Changes of vegetation Cover Ration (VCR) before and after volcanic eruption were monitored in the Mt. Pinatubo area using MOS-1/MESSR, LANDSAT/TM and JERS-1/OPS data. the map of VCR change helped clarify the dynamics of the affected are over time.
- With the aid of an algorithm incorporating hydrology in combination with VCR, area of secondary damages by mudflows of volcaminc ash and pyroclastic flow deposit were identified.
Introduction
Satellite remote sensing is one of the most effective methods for monitoring vegetation changes. However, it is very difficult to acquire optical remote sensing data in Asian monsoon area due to their heavy cloud cover. Because of this, we cannot rely completely on one optical sensor to monitor vegetation with a suitable observation interval and over the long term. instead, we must use multiple optical sensors and/or Synthetic Aperture Radar (SAR) sensors. Mt. Pinatubo is located in the northern part of the Luzon Island and erupted on June 15, 1991. Agricultural and forested lands in this area suffered a lot damage. The authors performed satellite remote sensing monitoring of this are and estimated vegetation damages caused by ash fall and mudflows from Mt. Pinatubo using MOS-1/MESSR, LANDSAT/TM, JERS-1/OPS
Satellite data
We used MOS-1/MESSR data acquired before and after Mt.Pinatubo eruption, and LANDSAT/T, and JERS-1/OPSacquired after the eruption. table 1 shows the characteristics of the optical sensors used in this study and table 2 lists the specifications of the optical sensor data that have been utilized.
Instrument
Much of image processing and analyses were performed using ERDAS/IMAGINE software on a sun work station.
Table 1 Characteristic of used optical sensors
| Satellite Name/ sensor |
Using period operation country |
Resolution recurrent swath width |
Band no. |
Wave Length |
Band name |
| LANDSAT |
USA |
30M x 30m |
TM1 |
450-520nm |
Blue |
| /TM |
1984 |
17 days |
TM2 |
520-600nm |
Green |
| |
|
185km |
TM3 |
630-690nm |
Red |
| |
|
|
TM4 |
760-900nm |
Near infra-red |
| |
|
|
TM5 |
1550-1750nm |
Middle infra-red |
| |
|
|
TM7 |
2080-2350 nm |
Meddle infra-red |
| |
|
TM6 :120 m X 120m |
TM6 |
10.4-12.5 nm |
Thermal infra-red |
| |
| MOSS-1 |
Japan |
50 m X 50 m |
MESSR1 |
510-600nm |
Green |
| /MESSR |
1987-1995 |
16 days |
MESSR2 |
610-690nm |
Red |
| |
|
100 km x 2 |
MESSR3 |
720-800nm |
Near infra red |
| |
|
|
MESSR4 |
800-1100nm |
Near infra -red |
| |
| JERS-1 |
Japan |
18 m X 24 m |
VNIR1 |
520-600nm |
Green |
| /OPS |
1992 |
44 days |
VNIR2 |
630-690nm |
Red |
| |
|
75 km |
VNIR3 |
760-860nm |
Near infra -red |
| |
|
|
SWIR4 |
1600-1710-nm |
Meddle infra -red |
| |
|
|
SWIR5 |
2010-2120nm |
Meddle infra -red |
| |
|
|
SWIR6 |
2130-2250nm |
Meddle infra -red |
| |
|
|
SWIR7 |
2270-2400nm |
Meddle infra -red |
Table 2 list of used optical satellite sensor data.
| Satellite/sensors |
Path row side.(sift ) |
Acquisition data yyyy/mm/dd |
Remarks |
| MOS-1/ |
P29R98W |
1989/11/25 |
Before eruption |
| /MESSR |
P29R99W |
1989/12/29 |
2 scenes for making one mosaic image |
| |
| |
(
1991/06/15 |
Date of the biggest eruption |
| |
| |
P29R99W(2) |
1991/07/05 |
After 20 days ( special observation) |
| |
P29R99W(2) |
1991/10/23 |
After 4 months ( special observation ) |
| |
P29R99W(2) |
1992/03/16 |
After 9 months ( special observation ) |
| LANDSAT |
P116R49 |
1993/04/02 |
After 2.5 years |
| /TM |
P116R50 |
1993/04/02 |
2 scenes for making one mosaic image |
| JERS-1 |
P90R275 |
1995/07/14 |
After 4 years |
| /OPS |
P91R275 |
1996/01/07 |
2 scenes for making one mosaic image |
