Error Analysis and Rectification in Spatial Data of Forest Resource by Designing Survey Water extraction coupling rectification for isolating volatile oils of Ligusticum chuanxiong Hort Water extraction coupling rectification for isolating volatile oils of Ligusticum chuanxiong Auto-registration and orthorectification system for the HJ-1A/B CCD images Effect of Inc idence Angle and Accuracy of DEM on Qua lity ofSPOT5 Ortho-imageMap A new benzaldehyde from residue left over rectification of star anise oil The Rectification of Three Illegal Names in the Genus Jungermannia (Hepaticae, Jungermanniaecae)