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Beyond Spatial Auto-Regressive Models: Predicting Housing Prices with Satellite Imagery

机译:超越空间自回归模型:预测住房价格   卫星图像

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摘要

When modeling geo-spatial data, it is critical to capture spatialcorrelations for achieving high accuracy. Spatial Auto-Regression (SAR) is acommon tool used to model such data, where the spatial contiguity matrix (W)encodes the spatial correlations. However, the efficacy of SAR is limited bytwo factors. First, it depends on the choice of contiguity matrix, which istypically not learnt from data, but instead, is assumed to be known apriori.Second, it assumes that the observations can be explained by linear models. Inthis paper, we propose a Convolutional Neural Network (CNN) framework to modelgeo-spatial data (specifi- cally housing prices), to learn the spatialcorrelations automatically. We show that neighborhood information embedded insatellite imagery can be leveraged to achieve the desired spatial smoothing. Anadditional upside of our framework is the relaxation of linear assumption onthe data. Specific challenges we tackle while implementing our frameworkinclude, (i) how much of the neighborhood is relevant while estimating housingprices? (ii) what is the right approach to capture multiple resolutions ofsatellite imagery? and (iii) what other data-sources can help improve theestimation of spatial correlations? We demonstrate a marked improvement of 57%on top of the SAR baseline through the use of features from deep neuralnetworks for the cities of London, Birmingham and Liverpool.
机译:在对地理空间数据建模时,捕获空间相关性对于实现高精度至关重要。空间自回归(SAR)是用于对此类数据进行建模的常用工具,其中空间连续性矩阵(W)对空间相关性进行编码。然而,SAR的疗效受到两个因素的限制。首先,它取决于对连续矩阵的选择,通常不从数据中学习,而是假定已知先验;其次,它可以通过线性模型来解释观测结果。在本文中,我们提出了一个卷积神经网络(CNN)框架来对地理空间数据(特定的房价)建模,以自动学习空间相关性。我们表明,可以利用嵌入的卫星图像中的邻域信息来实现所需的空间平滑。我们框架的另一个好处是放宽了对数据的线性假设。在实施我们的框架时,我们要解决的具体挑战包括:(i)在估算住房价格时有多少邻里是相关的? (ii)捕获卫星图像多分辨率的正确方法是什么? (iii)还有哪些其他数据源可以帮助改善空间相关性的估计?通过使用来自伦敦,伯明翰和利物浦等城市的深度神经网络的功能,我们证明了SAR基线之上57%的显着改善。

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