Mr. Ramon Alamús Profile

Ramon Alamús

Developer at Institut Cartogràfic i Geològic de Catalunya

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Proceedings Article | 4 November 2014 Paper

A methodology for luminance map retrieval using airborne hyperspectral and photogrammetric data

Luca Pipia, Ramon Alamús, Anna Tardà, Fernando Pérez, Vicenç Palà, Jordi Corbera

Proceedings Volume 9245, 92450O (2014) https://doi.org/10.1117/12.2067220

KEYWORDS: Sensors, Spatial resolution, Data acquisition, Calibration, Cameras, Scattering, Light sources and illumination, Satellites, Light sources, Charge-coupled devices

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This paper puts forward a methodology developed at the Institut Cartogràfic i Geològic de Catalunya (ICGC) to quantify upwelling light flux using hyperspectral and photogrammetric airborne data. The work was carried out in the frame of a demonstrative study requested by the municipality of Sant Cugat del Vallès, in the vicinity of Barcelona (Spain), and aimed to envisage a new approach to assess artificial lighting policies and actions as alternative to field campaigns. Hyperspectral and high resolution multispectral/panchromatic data were acquired simultaneously over urban areas. In order to avoid moon light contributions, data were acquired during the first days of new moon phase. Hyperspectral data were radiometrically calibrated. Then, National Center for Environmental Prediction (NCEP) atmospheric profiles were employed to estimate the actual Column Water Vapor (CWV) to be passed to ModTran5.0 for the atmospheric transmissivity τ calculation. At-the-ground radiance was finally integrated using the photopic sensitivity curve to generate a luminance map (cdm-2) of the flown area by mosaicking the different flight tracks. In an attempt to improve the spatial resolution and enhance the dynamic range of the luminance map, a sensor-fusion strategy was finally looked into. DMC Photogrammetric data acquired simultaneously to hyperspectral information were converted into at-the-ground radiance and upscaled to CASI spatial resolution. High-resolution (HR) luminance maps with enhanced dynamic range were finally generated by linearly fitting up-scaled DMC mosaics to the CASI-based luminance information. In the end, a preliminary assessment of the methodology is carried out using non-simultaneous in-situ measurements.

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