求翻译：由于遥感影像中经常出现“同物异谱”和“异物同谱”的现象，仅依靠光谱特征常不足以准确提取目标对象。是什么意思？

As the remote sensing images often appear in "synonyms spectrum" and "foreign body with the spectrum" of the phenomenon, often not enough to rely solely on the accurate extraction of spectral features of the target object.

" Because there are often in remote sensing image properties with different spectral" and "alien" phenomenon, with mass spectrometry Spectral characteristics alone is often insufficient to accurately extract target object.

Because in the remote sensing phantom appears “the same thing different spectrum” frequently and “the foreign matter same spectrum” the phenomenon, only depends upon the spectrum characteristic to be often insufficient to withdraw the goal object accurately.

As often occurs in remote sensing image "with different spectrum" and "foreign objects with Spectra", just by the spectral features often are insufficient to accurately extract the target object.

As often occurs in remote sensing image "with different spectrum" and "foreign objects with Spectra", just by the spectral features often are insufficient to accurately extract the target object.