【摘要】：地表異質(zhì)性廣泛存在于陸地表面各個尺度,是地表參數(shù)遙感反演不確定性的主要來源之一�；诟叻直媛实乇矸诸悈⒖紙D,提取出低分辨率混合像元的端元數(shù)量和邊界長度指標(biāo)來描述地表異質(zhì)性。然后以中國地區(qū)為例,使用全國30 m空間分辨率Global Land 30地表分類數(shù)據(jù)集提取出1 km尺度像元的描述混合結(jié)構(gòu)和破碎程度的異質(zhì)性指標(biāo)。并基于提取出的異質(zhì)性指標(biāo)分析了中國區(qū)域在1 km尺度上非均質(zhì)地表地物類型的組合特征、斑塊特征和不同生態(tài)群系內(nèi)部異質(zhì)性特征。發(fā)現(xiàn)山地和生態(tài)交錯區(qū)是主要的高異質(zhì)性區(qū)域,稀樹草原生物群系內(nèi)部異質(zhì)性最大(平均邊界長度為7 426 m),其次依次為森林(4 323 m)、耕地/草地(3 160 m)和灌叢(1 779 m)。
[Abstract]:Surface heterogeneity is widely found in all scales of land surface and is one of the main sources of uncertainty in remote sensing inversion of land surface parameters. Based on the high resolution surface classification reference map, the end element number and boundary length index of low resolution mixed pixels are extracted to describe the surface heterogeneity. Then, taking China region as an example, the heterogeneity index of 1 km scale pixel describing mixed structure and fragmentation degree is extracted by using the national 30 m spatial resolution Global Land 30 surface classification data set. Based on the extracted heterogeneity indexes, the composition characteristics, patch characteristics and internal heterogeneity characteristics of different ecological groups in China were analyzed on the scale of 1 km. It is found that the mountain and ecological intersections are the main regions with high heterogeneity, and the inner heterogeneity of the savanna biota is the largest (the average boundary length is 7 426 m), followed by the forest (4 323 m),). Arable land / grassland (3,160m) and thickets (1,779 m).)
【作者單位】： 中國科學(xué)院遙感與數(shù)字地球研究所遙感科學(xué)國家重點(diǎn)實(shí)驗(yàn)室;中國科學(xué)院大學(xué)資源與環(huán)境學(xué)院;全球變化研究協(xié)同創(chuàng)新中心;
【基金】：國家自然科學(xué)基金項(xiàng)目“非均質(zhì)混合像元遙感反射波譜模型構(gòu)建及葉面積指數(shù)反演方法研究”(編號:41271366) 國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃項(xiàng)目“復(fù)雜地表遙感信息動態(tài)分析與建模”(編號:2013CB733401)資助~~
【分類號】：P237

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