【摘要】：當(dāng)前對(duì)MODIS LAI產(chǎn)品的真實(shí)性檢驗(yàn)工作中,更多的是關(guān)注遙感產(chǎn)品在數(shù)值與趨勢(shì)上與地表真值的一致性程度,很少工作能夠全面分析遙感LAI產(chǎn)品偏差來源以及不同來源的偏差對(duì)全局偏差的貢獻(xiàn)率。本文在對(duì)MODIS LAI產(chǎn)品進(jìn)行真實(shí)性檢驗(yàn)基礎(chǔ)之上,進(jìn)一步分析了MODIS LAI產(chǎn)品偏差來源。將遙感產(chǎn)品真實(shí)性檢驗(yàn)偏差來源分解為反演模型,反射率數(shù)據(jù)和冠層聚集效應(yīng)3個(gè)方面,并定量分析各個(gè)偏差源對(duì)真實(shí)性檢驗(yàn)結(jié)果的影響。以河北省懷來玉米為研究對(duì)象,結(jié)合實(shí)測(cè)LAI數(shù)據(jù)和Landsat 8 OLI(Operational Land Imager)數(shù)據(jù)建立NDVI LAI半經(jīng)驗(yàn)?zāi)Ｐ?得到LAI參考數(shù)據(jù),據(jù)此對(duì)MODIS LAI產(chǎn)品進(jìn)行真實(shí)性檢驗(yàn)及偏差分析。研究表明,該區(qū)域MODIS LAI產(chǎn)品存在明顯的低估現(xiàn)象,參考數(shù)據(jù)和MODIS LAI數(shù)據(jù)均值分別為3.53 m2/m2和2.33 m2/m2,MODIS產(chǎn)品低估為34.14%。在各個(gè)偏差因素中,反射率數(shù)據(jù)的差異對(duì)結(jié)果影響最大,即MODIS地表反射率數(shù)據(jù)與Landsat 8 OLI地表反射率數(shù)據(jù)的差異造成的偏差占總偏差的57.50%;聚集效應(yīng)的影響次之,占總偏差的28.33%;模型差異對(duì)結(jié)果的影響最小,占總偏差的14.17%。本研究對(duì)遙感產(chǎn)品真實(shí)性檢驗(yàn)及其不確定性分析具有一定的借鑒意義。
[Abstract]:At present, in the authenticity inspection of MODIS LAI products, more attention is paid to the consistency between remote sensing products and surface true values in terms of value and trend. Few work can comprehensively analyze the sources of deviation of remote sensing LAI products and the contribution rate of deviation from different sources to the global deviation. On the basis of testing the authenticity of MODIS LAI products, this paper further analyzes the sources of deviation of MODIS LAI products. The deviation sources of remote sensing product authenticity test are decomposed into three aspects: inversion model, reflectivity data and crown aggregation effect, and the influence of each deviation source on authenticity test results is quantitatively analyzed. Taking Huailai corn in Hebei Province as the research object, combining the measured LAI data and Landsat 8 OLI (Operational Land Imager) data, the NDVI LAI semi-empirical model is established, and the LAI reference data are obtained. based on this, the authenticity and deviation analysis of MODIS LAI products are carried out. The results show that there is obvious underestimation of MODIS LAI products in this region, the average values of reference data and MODIS LAI data are 3.53 m2/m2 and 2.33 m2 鈮，

本文編號(hào)：2509207