Impact of Urban Forms on 3d Built-Up Intensity Expansion Rate from Aerial Stereo-Imagery

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dc.contributor.authorMwangi, P. W.
dc.contributor.authorKaranja, F. N.
dc.contributor.authorKamau, P. K.
dc.contributor.authorLetema, S. C.
dc.date.accessioned2021-03-10T06:15:36Z
dc.date.available2021-03-10T06:15:36Z
dc.date.issued2020
dc.descriptionA research paper published in ISPRS annals of the photogrammetry, remote sensing and spatial information sciencesen_US
dc.description.abstractUrban areas have been cited to be contributors to changing climatic conditions. Conversion of vegetated areas to impervious surfaces causes an alteration of surface temperatures, where impervious surfaces absorb and store incoming radiation during the day, releasing it slowly at night. This causes the urban heat island effect where temperatures in urban areas are higher than rural areas during night. Extreme weather conditions experienced in urban areas include heat waves, intense rainfall resulting to flash floods, destruction of infrastructure facilities. The research involved the use of time-series of stereo-aerial images acquired in 1978, 2000 and 2017. Building footprints were digitized and using digital elevation models, building heights were derived and volumes calculated. Road volumes were calculated using minimum standards of road construction and the total built-up volume was determined. The ground coverage ratio (GCR) and built-up volume densities (BVD) of the built-up areas was calculated from area and volumes from road and building values. Results indicate the mean GCR and BVD in Upper Hill is within the low density range. Mean building height from 1978 to 2017 are in the low-rise range with significant rise in building height and volumes between 1998 and 2017. The 3D built-up intensity expansion rate ranged between -4.28% to 56.80% per annum with a mean of 19.6% per annum. Roads and pavements also have a significant influence on the built-up density and should therefore be considered in planning policies.en_US
dc.identifier.citationMwangi, P. W., Karanja, F. N., Kamau, P. K., & Letema, S. C. (2020). IMPACT OF URBAN FORMS ON 3D BUILT-UP INTENSITY EXPANSION RATE FROM AERIAL STEREO-IMAGERY. ISPRS Annals of Photogrammetry, Remote Sensing & Spatial Information Sciences, 5(4).en_US
dc.identifier.issn2194-9050
dc.identifier.urihttps://www.isprs-ann-photogramm-remote-sens-spatial-inf-sci.net/V-4-2020/203/2020/isprs-annals-V-4-2020-203-2020.pdf
dc.identifier.urihttp://ir-library.ku.ac.ke/handle/123456789/21873
dc.language.isoenen_US
dc.publisherThe International Society for Photogrammetry and Remote Sensingen_US
dc.subjectGround Coverage Ratioen_US
dc.subjectBuilt-up Volume Densityen_US
dc.subject3D Built-up Intensityen_US
dc.subjectHeighten_US
dc.subjectStereo Imageryen_US
dc.subjectUrban Formen_US
dc.titleImpact of Urban Forms on 3d Built-Up Intensity Expansion Rate from Aerial Stereo-Imageryen_US
dc.typeArticleen_US
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