Sri Lanka/Swiss satellite imagery interpretation project. Activities in 1981 (land use, mapping)

affectation de ressources arroz asia asie cartografia cartographie cartography cereales cereals crops cultivos cultivos de grano desarrollo de recursos economic plants forest resources grain crops land use living resources methode methods natural resources plantas plante plante de culture plants recursos recursos forestales recursos naturales remote sensing resource allocation resource development resources ressource ressource naturelle ressource vivante rice riz sri lanka utilisation du sol