arXiv:2412.07488stat.MLcs.LG2024-12被引 3

提出双随机场模型,融合多源地质响应预测与不确定性评估。

Dual Random Fields and their Application to Mineral Potential Mapping

  • 将响应函数视为区域化变量,构建双随机场框架
  • 支持跨区域响应模型的统一建模与空间推断
  • 适合地质资源预测与高成本采样场景下的决策支持

在矿产勘探、已运营矿山的几何冶金表征及遥感等领域,输入变量在研究区域内通常空间采样充分,限制了空间不确定性量化方法的应用。而矿产潜力、选矿处理量、冶金回收率或遥感图像中的原位估算等响应结果,往往仅基于有限且受限的测试样本建模,这些样本因可及性限制和高采集成本仅分布于特定位置。由于对这些函数的多维因果复杂性及对不可获取输入的隐含依赖缺乏了解,可能导致对响应随地理区位变化的误判。整合全域不同响应函数对于准确预测未探查区域的响应值、其不确定性以及输入变量的重要性至关重要。本文引入双随机场(dRF)概念,将响应函数本身视为区域化变量。在此框架下,各区域已建立的响应模型被视为dRF的一个实现观测,从而支持对响应模型及其预测的空间推断与不确定性评估。dRF继承经典随机场的所有性质,可使用标准高斯模拟方法进行生成。通过结合多个响应模型,得到矿产潜力响应,展示了机器学习与地统计学严格融合的范例。

原文摘要 · Abstract (English)

In various geosciences branches, including mineral exploration, geometallurgical characterization on established mining operations, and remote sensing, the regionalized input variables are spatially well-sampled across the domain of interest, limiting the scope of spatial uncertainty quantification procedures. In turn, response outcomes such as the mineral potential in a given region, mining throughput, metallurgical recovery, or in-situ estimations from remote satellite imagery, are usually modeled from a much-restricted subset of testing samples, collected at certain locations due to accessibility restrictions and the high acquisition costs. Our limited understanding of these functions, in terms of the multi-dimensional complexity of causalities and unnoticed dependencies on inaccessible inputs, may lead to observing changes in such functions based on their geographical location. Pooling together different response functions across the domain is critical to correctly predict outcome responses, the uncertainty associated with these inferred values, and the significance of inputs in such predictions at unexplored areas. This paper introduces the notion of a dual random field (dRF), where the response function itself is considered a regionalized variable. In this way, different established response models across the geographic domain can be considered as observations of a dRF realization, enabling the spatial inference and uncertainty assessment of both response models and their predictions. We explain how dRFs inherit all the properties from classical random fields, allowing the use of standard Gaussian simulation procedures to simulate them. These models are combined to obtain a mineral potential response, providing an example of how to rigorously integrate machine learning approaches with geostatistics.

地统计学矿产预测不确定性量化双随机场

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