NDLI: Assessment of the Impacts of Image Signal-to-Noise Ratios in Impervious Surface Mapping

Content Provider	Directory of Open Access Journals (DOAJ)
Author	Zhuoting Wu Cody Anderson George Xian Hua Shi
Abstract	Medium spatial resolution satellite images are frequently used to characterize thematic land cover and a continuous field at both regional and global scales. However, high spatial resolution remote sensing data can provide details in landscape structures, especially in the urban environment. With upgrades to spatial resolution and spectral coverage for many satellite sensors, the impact of the signal-to-noise ratio (SNR) in characterizing a landscape with highly heterogeneous features at the sub-pixel level is still uncertain. This study used WorldView-3 (WV3) images as a basis to evaluate the impacts of SNR on mapping a fractional developed impervious surface area (ISA). The point spread function (PSF) from the Landsat 8 Operational Land Imager (OLI) was used to resample the WV3 images to three different resolutions: 10 m, 20 m, and 30 m. Noise was then added to the resampled WV3 images to simulate different fractional levels of OLI SNRs. Furthermore, regression tree algorithms were incorporated into these images to estimate the ISA at different spatial scales. The study results showed that the total areal estimate could be improved by about 1% and 0.4% at 10-m spatial resolutions in our two study areas when the SNR changes from half to twice that of the Landsat OLI SNR level. Such improvement is more obvious in the high imperviousness ranges. The root-mean-square-error of ISA estimates using images that have twice and two-thirds the SNRs of OLI varied consistently from high to low when spatial resolutions changed from 10 m to 20 m. The increase of SNR, however, did not improve the overall performance of ISA estimates at 30 m.
e-ISSN	20724292
DOI	10.3390/rs11222603
Journal	Remote Sensing
Issue Number	22
Volume Number	11
Language	English
Publisher	MDPI AG
Publisher Date	2019-11-01
Publisher Place	Switzerland
Access Restriction	Open
Subject Keyword	Science Impervious Surface Signal-to-noise Ratios Worldview-3 Landsat
Content Type	Text
Resource Type	Article

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