JOINT INTERPRETATION OF DUAL POLARIZATION SAR AND MULTISPECTRAL OPTICAL IMAGES FOR GEOLOGICAL MAPPINT IN STRONGLY WEATHERED ZONE IN SOUTHERN CHINA
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摘要: 中国南方地区气候温暖湿润，多数地质体覆盖有厚度不等的风化层，植被茂密，光学遥感图像上反映的大部分是植被覆盖层的光谱信息，对地质解译填图造成了困难。以粤西罗定地区为例，在植被茂密的南方强风化地区利用ALOS-PALSAR双极化合成孔径雷达影像与Landsat 8 OLI多光谱影像进行联合解译，结果表明，联合解译能够有效提升可识别岩性的种类，可以在南方强风化区填图中进行推广。Abstract: Most of the geological bodies are covered by different thickness of weathering layers and dense vegetation due to the warm and humid climate in South China. Therefore, most optical remote sensing images reflect the spectral information of the vegetation layer, and which resulted in the difficult for the geological interpretation and mapping. In this paper, the ALOS-PALSAR dual-polarized SAR images and the Landsat8 OLI multi-spectral images have been interpreted jointly in Luoding area, western Guangdong. The result showed that joint interpretation can effectively increases identifiable species of lithology, and could be popularized for the mapping in strongly weathered areas of south China.
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Key words:
- dual polarization /
- synthetic aperture radar /
- geological mapping /
- strongly weathered
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图 2 岩性解译结果
Figure 2. Results of lithologic interpretation by using ALOS-PALSAR polarization image and Landsat8 OLI multi spectral image
图 3 试验区西北局部放大对比图
Figure 3. Contrast of magnified map between joint interpretation and optics interpretation in the northwestern area
图 4 试验区东南局部对比图
Figure 4. Contrast of magnified map between joint interpretation and optics interpretation in the southeast area
表 1 使用联合解译前后岩性解译结果变化
Table 1. The interpreted lithologic before and after using joint interpretation
序号 光学解译 联合解译 备注 1 K2t γπK 调查区西北角, γπK呈斑块状分布 2 O ηγJ3 调查区西北角, ηγJ3呈斑块状分布 3 Є Є3g, Є4s 调查区西北部, 呈条状分布, 区分水石组和高滩组 4 K2t O3lw, K2t 调查区东北部, 区分兰翁组和铜鼓岭组 5 S1g-S1d S1g, S1d 调查区东北角, 区分古墓组和大岗顶组 6 C1s-C1l C1s 调查区东南角, 区分石凳子组和连县组 
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表 2 与表 1对应的Landsat8 OLI和ALOS-PALSAR伪彩影像岩性解译特征
Table 2. Interpretation characteristics of lithologic of Landsat8 OLI and ALOS-PALSAR pseudo color images corresponding to table 1
岩性单元 Landsat8 OLI光学伪彩合成图 ALOS-PALSAR极化伪彩合成图 微波遥感影像特征 K2t 
分布于罗定盆地东北边部, 呈小块状山体, 发育树枝状、平行状水系, 冲沟切割较深, 微波极化伪彩合成图像上整体呈亮蓝色, 覆盖植被, 影纹图案呈树枝状 S1g 
分布于历洞镇-连滩镇之间山地的东部和东南部区域; 呈北西向的条状与块状山体, 水系呈北西走向; 微波极化伪彩合成图上呈蓝色, 分布有浅黄色斑块, 可见大块的山体阴影 S1d 
分布于历洞镇-连滩镇之间山地的西部区域; 呈北西向的破碎条状山体, 与S1g的山体走向存在北东向错位; 微波极化伪彩合成图上呈蓝色, 分布有曲回的沟壑 O3lw 
分布于河口镇西北、罗定盆地东北边部K2t的北部, 呈小块状山体, 冲沟切割较深; 微波极化伪彩合成图像上呈亮蓝色, 覆盖植被, 可见沟壑阴影 Є4s 
分布于筋竹镇北-东侧; 呈北东向连续分布的大型块状山体, 山脊呈尖棱状, 植被覆盖茂密, 纹理主要呈北西与北东走向; 微波极化伪彩合成图像上呈亮蓝色, 分布有树枝状阴影。 Є3g 
分布于筋竹镇东侧一带, 呈连续分布的小型块状山体, 主要呈北东向分布, 植被茂密; 发育树状水系, 密度一般; 微波极化伪彩合成图像上呈蓝色, 较∈4s暗淡, 分布有黄褐色斑块 γπK 
位于罗定盆地南部, 在筋竹镇北部亦有零星分布; 微波极化伪彩合成图像上呈椭圆形, 岩体呈正地形出现于白垩纪红层中, 与围岩界线清楚; 岩体中线性构造发育, 影像色调呈灰蓝色, 在图上形成明显的色调异常区 ηγJ3 
位于筋竹镇北部, 地貌上表现为负地形, 地势低洼, 岩体边部为环形或弧形山脊, 围岩则呈突起的正地形; 岩体内呈丘陵地貌, 地形较和缓, 山体呈小块状或长条状; 发育稀疏—中等密度的树枝状水系, 冲沟切割较浅; 影像色调呈蓝色或灰黄色相间, 亮度中等, 影纹图案为脑纹状
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