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Land Use
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Reserch The System Environmental Change Extraction
using Satellite Data
3.3 Make the manual of interpretation for microwave imagery
- Interpretation of RADASAT imagery
RADARSAT imagery has easily interpreted vegetation due to difference of wavelength and off-nadir angle view of comparing RADARSAT with JERS-1 of microwave sensor.
Interpretation of the boundary of cultivated area and roads of Urban area so as line objects has improved from high ground resolution of RADARSAT sensor. Pineapple area which lies between the both Reserve Water area in study area is difficult to interpret even
OPS sensor or LANDSAT-TM. The area is mixture area of field, mix orchard and pineapple. But we could interpret their items using different back scatter of RADARSAT imagery. Forest and Wasteland area has tendency of clearly ridge line. Particularly Forest area shows strong back scatter from all kinds of filiage. But difference between Forest and Wasteland have difficult interpretation caused by characteristic of back scatter.
Details of each interpretation items are shown by microwave image interpretation manual in this report.
- Interpretation of composite imagery
In the case of rubber area dotted with field, interpretation on RADARSAT imagery was difficult because of some radiance value. But the field appears as the light green than rubber in composite imagery.
As the judgment at the rubber area or the mix orchard area, difference of both can be confirmed so as colors in the composite imagery. Rubber area is uniform purple, mix orchard area is purple and white intermingle. It's difficult as above-mentioned in case of RADARSAT imagery.
4. Conclusions
In this research, we could understand as follows,
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The visual understanding of environmental change is improved by overlaying
topographic map and extraction imagery of land cover change.
- The environmental change can be quantitatively analyzed by GIS.
- The interpretation of detail is improved by using microwave imagery.
We can provide the basis data for policy of environment and agriculture using this research. In the future, we need to execute the research that analyze relation between the activity of the area economy and the environmental change using GIS. For example, its is that analyzing relation between the population of area, the agricultural production of area and the environmental change.
And we can do accurate interpretation of road, river and cultivated boundary by making out manual of interpretation for microwave imagery. In the future, we think that need to continue to execute research of the microwave imagery.
Reference
- Kunio NONOMURA, Tadao HOYA, others, "Research on the Land Use in the Tropical Zone", Technical Report of Joint Research on the Enhancement and Application of the Remote Sensing Technology with ASEAN Counties (Phase II), 1991.
- Hiromichi MARUYAMA, Hiroshi MASHARU, others, "The research on methods for surveys of topography and land use using remote sensing data", Technical Report of Joint Research on Environmental Change in Tropical Report (Phase I), 1995 (in Japanese)
- Earth Remote Sensing Data Analysis Center, "Synthetic Aperture Radar (SAR)", 1995 (in Japanese)
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