Estimating Stem Volume Using QuickBird Imagery and Allometric Relationships for Open Populus xiaohei Plantations Monitoring Vegetation Coverage Degree of Forestland Converted from Cropland by Applying High Resolution Satellite Image Quantitative Estimation for Forest Stand Crown of Different Stand Densities by Remote Sensing Remote sensing estimation of urban forest carbon stocks based on QuickBird images. Study on Tree-Crown Extraction from QuickBird Imagery Based on Object-Oriented Approach in the Project of Converting Cropland to Forest Estimating Forest Stand Crown Based on High Spatial Resolution Image