科尔沁沙地5种典型沙生植被高光谱特性分析与遥感解译参数提取

doi:10.11934/j.issn.1673-4831.2017.07.008

Abstract

Abstract:

A FieldSpec 4 portable spectrometer was used to measure spectra of five types of psammo-vegetation typical of the Horqin sandy land for extraction and analysis of spectral characteristics of the vegetations. Results show that the five types of psammo-vegetation (Salix flavida, Artemisia frigida, Herbal ephedrae, Artemisia halodendrou and Caragana microphylla), though quite similar in spectral shape, varied slightly. Differences were apparent on bands of 600-690 and 750-900 nm. Based on bands showing difference in spectrum and derivative spectrometric parameters, it was feasible to distinguish Artemisia frigida, Herbal ephedrae and Artemisia halodendrou, but not Salix flavida and Caragana microphylla from the five. With the vegetation growing season going on, "green peak" tended to offset toward the blue light zone and then back toward the red light one. The spectra of the vegetations of Salix flavida, Artemisia frigida, Herbal ephedrae and Caragana microphylla all exhibited obvious "twin peaks" on their corresponding "red edges", but that of the vegetation of Artemisia halodendron did not so obviously; In the spectra of Salix flavida, Herbal ephedrae and Caragana microphylla "redshift" appeared so significantly in the "red edge" zone, while in the spectra of the vegetations of Salix flavida and Artemisia frigida "blue shift" was observed in the "red edge" zone at the end of September, and in the spectra of the vegetations of Artemisia frigida and Artemisia halodendrou, the "red edge" tended to move very slightly towards the blue light zonetrend and no sign of "red shift" was ever observed. "Red edge platforms" were observed in the spectra of all the five types of psammo-vegetation in August and September, and the spectra of the vegetations of Artemisia halodendrou and Caragana microphylla kept on staying in "red edge platform" on September 27. The five types of psammo-vegetations absorbed more light of the red light band than that of the blue light band and in absorption depth, too. With the vegetations growing on, their spectra varied similarly in absorption depth and in absorption peak area. In summer, the spectrum of the vegetation of Herbal ephedrae varied more significantly than those of the other four. Meanwhile NDVI analysis of the five types of psammo-vegetations at various growth stages shows that the variation of NDVI was quite similar in trend to that of adsorption depth, but reverse to that of absorption area. The "red edge" parameters, "absorption" parameters and sequential NDVI data of the vegetations at different growth stages were better than all the others when used to identify vegetation. In classifying vegetation in the study area, it is more advisable to perform interpretation of multi temporal remote sensing images of the vegetation in spring (early vegetation growth season) and the middle and late autumn (vegetation growth recession season) in combination for better effect.

Key words: spectral characteristics, sand vegetation, first derivative, continuum-removed, NDVI

CLC Number:

NIU Ya-long, LIU Ting-xi, DUAN Li-min, LUO Yan-yun, QI Xiu-jiao, CHEN Xiao-ping. Analysis of Hyperspectral Characteristics and Extraction of Remote Sensing Interpreting Parameters of Five Types of Typical Psammo-Vegetation of the Horqin Sandy Land[J]. Journal of Ecology and Rural Environment, 2017, 33(7): 632-644.

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Analysis of Hyperspectral Characteristics and Extraction of Remote Sensing Interpreting Parameters of Five Types of Typical Psammo-Vegetation of the Horqin Sandy Land

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