UNEP Environment Assessment Programme for Asia and the Pacific (UNEP/EAP.AP) has been involving in the macro-scale assessment and monitoring of major land cover types in the selected countries in the region. Assessment and monitoring of nine countries viz. Bangladesh, Cambodia, Malaysia, Myanmar, Lao P.D.R., Nepal, Pakistan, Thailand and Vietnam has been completed. The aim is to prepare a wall-to-wall map covering all the countries in the Asia-Pacific region.
NOAA AVHRR HRPT data was found to be the best available data source for large scale assessment and monitoring. This is because of its comparative advantages such as synoptic coverage, low data volume and high temporal resolution. Time series analysis of AVHRR data enabled us to identify areas undergoing major land cover transformations called "hot spots". Detailed investigation of these ‘hot spot’ areas is being conducted using high resolution satellite data such as SPOT, Landsat and IRS. For regional/national application, the information generated could be useful for reporting on the status of the environment of the earth. The harmonisation of the data source, methodology and classification system is an important aspect of the project that provides an opportunity for comprehensive regional resource assessment and information generation, an important decision input for the regional and national context.
In this volume, land cover assessment and monitoring of Thailand have
been presented. The rationale and detailed methodology of the project can
be found in Volume 1-A.