# WAHRSIS: A Low-cost, High-resolution Whole Sky Imager With Near-Infrared Capabilities

arXiv: https://arxiv.org/abs/1605.06595 · HTML: https://mlsanity.com/paper/1605.06595/

## Key facts

- Cited by 3 papers in the map (data through 14 Oct 2026).
- First posted on arXiv 21 May 2016.

## Built on by (most cited first, 3 of 3)

- [Review of Kernel Learning for Intra-Hour Solar Forecasting with Infrared Sky Images and Cloud Dynamic Feature Extraction](https://mlsanity.com/paper/2110.05622/) (2021)
- [MPCM-Net: Multi-scale network integrates partial attention convolution with Mamba for ground-based cloud image segmentation](https://mlsanity.com/paper/2511.11681/) (2025)
- [M3S-Net: Multimodal Feature Fusion Network Based on Multi-scale Data for Ultra-short-term PV Power Forecasting](https://mlsanity.com/paper/2602.19832/) (2026)

## Abstract (arXiv)

Cloud imaging using ground-based whole sky imagers is essential for a fine-grained understanding of the effects of cloud formations, which can be useful in many applications. Some such imagers are available commercially, but their cost is relatively high, and their flexibility is limited. Therefore, we built a new daytime Whole Sky Imager (WSI) called Wide Angle High-Resolution Sky Imaging System. The strengths of our new design are its simplicity, low manufacturing cost and high resolution. Our imager captures the entire hemisphere in a single high-resolution picture via a digital camera using a fish-eye lens. The camera was modified to capture light across the visible as well as the near-infrared spectral ranges. This paper describes the design of the device as well as the geometric and radiometric calibration of the imaging system.