Tree Cover Change in Victoria Between 1990 and 1995

Polygons showing tree cover change as defined by woody vegetation greater than 2 metres in height and with a crown cover (foliar density) greater than 10%. Tree cover is mapped down to a minimum area of quater hectare for change period 1990-1995. Attributes outlining the causes of tree cover change are assigned for areas greater than 1 hectare. This layer was derived from LANDSAT TM digital data.本数据集包含展示树木覆盖变化的多边形要素，其定义依据为：高度大于2米、冠层覆盖度（叶密度）大于10%的木本植被（woody vegetation）。在1990-1995年的变化监测时段内，树木覆盖制图的最小上图面积为0.25公顷（四分之一公顷）。针对面积大于1公顷的区域，会分配用于描述树木覆盖变化成因的属性字段。该图层源自陆地卫星专题制图仪（LANDSAT TM）数字遥感数据。