Overlay analysis on forest resource vector data for Maoershan Experimental Forest Farm,northeastern China.

Based on the forest management inventory stand maps and subcompartment data in 1983 and 2004 of Maoershan Experimental Forest Farm of Northeast Forestry University,supported by GIS techniques,the vector forest maps of 1983 and 2004 were overlaid to generate a changing map of forest resources,including distribution maps of forest farm boundary,compartment boundary,age class and species origin.The changes of forest types in space distribution of 1983 and 2004 were reflected in the map. It not only reflects the forest resource in the past,but also at present.It can offer the scientific data for the sustainable management of forest resources.