Estimating Visible Band Albedo from Aerial Orthophotographs in Urban Areas
Albedo is an important parameter in many environmental and renewable energy models. Satellite sensors can be used to derive broadband or narrowband albedos. However, the spatial resolution of such data can be insufficient in urban areas with complex morphology and land cover diversity. In this study...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-12-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/14/1/164 |
| _version_ | 1797497679779987456 |
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| author | Jaroslav Hofierka Katarína Onačillová |
| author_facet | Jaroslav Hofierka Katarína Onačillová |
| author_sort | Jaroslav Hofierka |
| collection | DOAJ |
| description | Albedo is an important parameter in many environmental and renewable energy models. Satellite sensors can be used to derive broadband or narrowband albedos. However, the spatial resolution of such data can be insufficient in urban areas with complex morphology and land cover diversity. In this study, we propose the use of widely available aerial orthophotographs to derive visible band albedo in urban surfaces that can be effectively used in high-resolution applications. The solution is based on the estimation of the reflected irradiance captured by an RGB sensor and approximated by the brightness component in the hue-saturation-brightness (HSB) color model and incident solar irradiance modelled by the r.sun module in GRASS GIS. The visible band albedo values are calibrated by published reference values for selected land cover classes or, alternatively, by a spectroradiometer. The method is applied to the central part of Košice and compared to visible band albedo derived from the Landsat 8 OLI and Sentinel 2A sensors and previously published typical albedo values for various land cover classes, resulting in reasonable agreement. The proposed methodology is implemented using standard GIS tools that are easily applicable to any high-resolution urban data. |
| first_indexed | 2024-03-10T03:22:40Z |
| format | Article |
| id | doaj.art-02214859122d4774b109476cac698b19 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-10T03:22:40Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-02214859122d4774b109476cac698b192023-11-23T12:14:08ZengMDPI AGRemote Sensing2072-42922021-12-0114116410.3390/rs14010164Estimating Visible Band Albedo from Aerial Orthophotographs in Urban AreasJaroslav Hofierka0Katarína Onačillová1Institute of Geography, Faculty of Science, Pavol Jozef Šafárik University in Košice, 041 54 Košice, SlovakiaInstitute of Geography, Faculty of Science, Pavol Jozef Šafárik University in Košice, 041 54 Košice, SlovakiaAlbedo is an important parameter in many environmental and renewable energy models. Satellite sensors can be used to derive broadband or narrowband albedos. However, the spatial resolution of such data can be insufficient in urban areas with complex morphology and land cover diversity. In this study, we propose the use of widely available aerial orthophotographs to derive visible band albedo in urban surfaces that can be effectively used in high-resolution applications. The solution is based on the estimation of the reflected irradiance captured by an RGB sensor and approximated by the brightness component in the hue-saturation-brightness (HSB) color model and incident solar irradiance modelled by the r.sun module in GRASS GIS. The visible band albedo values are calibrated by published reference values for selected land cover classes or, alternatively, by a spectroradiometer. The method is applied to the central part of Košice and compared to visible band albedo derived from the Landsat 8 OLI and Sentinel 2A sensors and previously published typical albedo values for various land cover classes, resulting in reasonable agreement. The proposed methodology is implemented using standard GIS tools that are easily applicable to any high-resolution urban data.https://www.mdpi.com/2072-4292/14/1/164albedosolar radiationorthophotographsurban areasKošice city |
| spellingShingle | Jaroslav Hofierka Katarína Onačillová Estimating Visible Band Albedo from Aerial Orthophotographs in Urban Areas Remote Sensing albedo solar radiation orthophotographs urban areas Košice city |
| title | Estimating Visible Band Albedo from Aerial Orthophotographs in Urban Areas |
| title_full | Estimating Visible Band Albedo from Aerial Orthophotographs in Urban Areas |
| title_fullStr | Estimating Visible Band Albedo from Aerial Orthophotographs in Urban Areas |
| title_full_unstemmed | Estimating Visible Band Albedo from Aerial Orthophotographs in Urban Areas |
| title_short | Estimating Visible Band Albedo from Aerial Orthophotographs in Urban Areas |
| title_sort | estimating visible band albedo from aerial orthophotographs in urban areas |
| topic | albedo solar radiation orthophotographs urban areas Košice city |
| url | https://www.mdpi.com/2072-4292/14/1/164 |
| work_keys_str_mv | AT jaroslavhofierka estimatingvisiblebandalbedofromaerialorthophotographsinurbanareas AT katarinaonacillova estimatingvisiblebandalbedofromaerialorthophotographsinurbanareas |