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Digitizing Aguda/Afro Brazilian architecture heritage of Porto-Novo Benin through LIDAR scanning & social participation

H. Killion Mokwete

This study explores the use of LIDAR scanning and community engagement in the digital documentation of Aguda/Afro Brazilian architecture in Benin, as a vital component of the preservation of historically significant structures that face imminent demolition. Researchers from Northeastern University are working together on the project with local research partners from The African Heritage School-EPA in Porto-Novo. A small but significant digital database is developing as a result of several field studies, oral interviews, and digital scanning processes. This digital database is an essential component of a proof of concept pilot project that aims to create region-wide digital documentation and will involve collaborating with students and other local researchers to identify, catalog, and conserve Africa’s local building heritage. This pilot project is envisaged as a test case for potential expansion to other cultural regions with similar heritage buildings such as Togo, Nigeria, Cameroon and Côte d’Ivoire where local partnerships are being developed. 

Digital tools and social participation are key to preserving postcolonial architectural heritage in Benin

According to the United Nations Educational, Scientific and Cultural Organization (UNESCO), the African continent has some 98 designated World Heritage Sites (cultural) and more than half of these can be found in 35 Sub-Saharan African countries. However, many of these sites in Africa (a total number of 93, in 2018) are placed on the List of World Heritage in danger due to threats from extractive processes (mineral and oil exploration), armed conflict, acts of terrorism, climate change, poaching, and uncontrolled rural and urban expansions.


Grande Mosque, Porto-Novo, Benin, by odysseesdarchitectures
Grande Mosque, Porto-Novo, Benin, by odysseesdarchitectures

Most heritage buildings in Sub-Saharan Africa can be organized in three categories: pre-colonization (traditional), colonial and post-colonial. These eras provide a base socio economic and historical context which marks events and activities that shaped the urban morphology, geo-social landscape of much of the Africa continent and that of the global South. Traditional era of Sub-Saharan African building heritage can be defined as the period during which feudal African tribes and regions self-ruled and built varying vernacular structures dictated by socio economic status and means of production for each cultural region.

The Colonial era in Africa can be defined as the period between the first colonization of an Africa Kingdom by the Dutch in the 16th Century when they colonized parts of the cultural regions of the modern day Ghana (Gold Coast). The colonization period saw the partitioning of African cultural regions into territorial boundaries defined by colonizers interests and colonial structures. The introduced colonial building typologies and urban morphology of urban centers included religions such as churches & cathedrals, trading centers, castles etc. The Post-Colonial era can be defined as the period after decolonization and independence of Sub-Saharan African countries. During this period, independence governmental buildings and other structures were built to signify new beginnings and future aspirations.

The Great Mosque of Djenne, Part of Africa’s remaining building heritage that is a UNESCO Protected heritage site photo by zibaloo
The Great Mosque of Djenne, Part of Africa’s remaining building heritage that is a UNESCO Protected heritage site photo by zibaloo

In this essay, we use culturally-significant sites in the West African nation of Benin as a case study to examine the ways in which digital tools, digital archiving platforms and local social participation may be leveraged to preserve cultural heritage building sites in African postcolonial societies. The focus is on the on the architectural heritage (between traditional and colonial) of the Aguda people and investigate the new ways of leveraging technology towards building heritage preservation, education and local empowerment through social participation.  The Aguda of the Bight of Benin is a community composed the descendants of the Portuguese traders who settled in the region in the 1700s; the descendants of the Brazilian traders who came soon after; and the descendants of the retornados, i.e., former slaves who settled in this area upon their return from Brazil. The retornados, researchers put their numbers at anywhere from 3,000 to 8,000 were originally from a vast sub-region of western Africa, but upon their return, they settled mainly on the coast between Lagos, Nigeria and Anehó, Togo.


Afro-Brazilian architecture in Porto-Novo reflects Aguda influence, yet faces neglect, limited preservation efforts, and climate threats.

The Aguda’s influence in Benin’s urban morphology is best found in the City of Porto-Novo, where new typology of building style based on villa & manor designs of Brazil was mixed in with local vernacular to create a style popularly known as the Afro-Brazilian architecture style. This style is exemplified by building on generally two floors, with regular shapes, large verandahs on both sides of buildings with arcades, bays decorated with rich roman-like lintels and usually wooden shutters.


The Afro-Brazilians returnees constituted artisans, cabinet makers, bricklayer’s/master builders, tailors, traders, carpenters and other trade skills. In 1897 in Lagos, there were 96 males registered with 6 cabinet makers, 11 bricklayers and builders, builders and master builders, 9 tailors and 21 carpenters, 24 traders and 17 clerks. 23 percent of the Afro-Brazilian populations were carpenters. Carpentry and bricklaying remain the main occupation of some of the Brazilian returnees. Afro- Brazilian houses are in a state of disrepair and suffer from neglect. The necessity for conservation and the salience of cultural heritage is mainly advocated by architects with limited resources towards rehabilitation and preservation.


Typical private residence Afro-Brazilian (Sobrados) features two storey dwelling with clay ornate facades, decorated windows, balconies & doors with clay molding, breezeways (open source)
Typical private residence Afro-Brazilian (Sobrados) features two storey dwelling with clay ornate facades, decorated windows, balconies & doors with clay molding, breezeways (open source)

Although some steps are being taken to protect heritage sites, Heritage protection in Porto-Novo, with a great successful example of the rehabilitation of the Vodoun sites across Porto-Novo by The Ouadada Cultural Centre) there is still not sufficient resources to undertake a comprehensive rehabilitation of all sites. The lack of resources organizations and advocacy towards building heritage also presents a diminishing role of local community in participating in defining their heritage assets and therefore loss of continuity across generation’s institutional memory. Furthermore, limited legal frameworks such laws towards heritage preservation for pre-development impact assessments make it easy for developers to prefer demolishing without any prior assessments.


Benin, like most Sub-Saharan African countries, lacks accessible digitized databases and archive institutions with more African heritage archives being held in foreign institutions such as European, American and Australian universities and museums. The current work being undertaken by the  (École du Patrimoine Africain (African Heritage School) lacks scaling opportunities and funding partnerships. 

Climate change impacts such as higher temperatures, worsening floods, threaten to condemn some African landmarks. There is no comprehensive data on the total number of African heritage spots at risk, but research co-led by Simpson on coastal sites found that 56 locations are already facing flooding and erosion exacerbated by rising sea levels. In Benin, the Aguda architecture buildings due to the material nature are quickly deteriorating due to heavy rains and flooding amongst others.  


A collaborative digital platform will preserve Benin’s architectural heritage by combining technology, local knowledge, and global partnerships

The project’s conceptual framework for this research is centered on what is described by The Framework Convention on the Value of Cultural Heritage for Society (Council of Europe 2005) as ‘Heritage Community’ defined as “cultural heritage is a group of resources inherited from the past which people identify, independently of ownership, as a reflection and expression of their constantly evolving values, beliefs, knowledge and traditions. It includes all the aspects of the environment resulting from the interaction between people and places through time”


This new way of looking at heritage lays the foundations for redesigning relations between all the involved stakeholders. The proposed model for this project centers a partnership between researchers (local and international) and local community knowledge custodians through a social participation framework and leveraging technological tools towards documentation and curating of local building heritage physical and non physical cultural memory.


By building on this collaborative platform framework, this research will leverage the following technologies and approaches: Modern 3D capture through LiDAR scanning and photogrammetry technology will be used to document the existing condition of heritage buildings and to create digital blueprints, enabling planners to prioritize preservation activities and furthering opportunities for future building renovations and reuse. Through centering community participation and storytelling, this research will activate community members’ role in celebrating unique cultural heritage embedded in their local built environment and defining and curating personalized building heritage narratives.


Leica’s BLK360 Tripod LIDAR Scanner, BLK2FLY drone scanner, Infrared Temperature visualization, Onset Data loggers (Temperature & Humidity)
Leica’s BLK360 Tripod LIDAR Scanner, BLK2FLY drone scanner, Infrared Temperature visualization, Onset Data loggers (Temperature & Humidity)Leica’s BLK360 Tripod LIDAR Scanner, BLK2FLY drone scanner, Infrared Temperature visualization, Onset Data loggers (Temperature & Humidity)

By creating a locally hosted and searchable database of heritage buildings, this research will start the first-ever platform for an architectural heritage archive serving Benin and other sub-Saharan African countries.

Creating three-dimensional digital models will enable community-based education and academic research opportunities focused on vernacular building methods, offering opportunities for virtual experiential connection, with focused outreach to the global African diaspora community seeking to connect and learn about African heritage.



This innovative and interactive platform will be made accessible to local university partners (École du Patrimoine Africain (African Heritage School), who in turn will benefit from new opportunities for technical and socio-cultural teaching and research. The proposed platform will be based on a collaborative model, developed in partnership with local communities who are custodians of culturally significant architectural artifacts. Models, historical records, and local narratives about heritage sites can be shared with diverse local community members, leveraging local press, libraries, and municipal archives.  There is a critical need for coordination and technical support from Northeastern University, where researchers and students will serve as partners with community-based organizations, bringing innovative tools for creating a multimedia digital archive, technical expertise, and cross-regional coordination to create and maintain the platform and to carry out ongoing research on traditional building practices and the cultural, historical, and technological significance of diverse architectural resources.


A digital platform will document and preserve endangered heritage sites in Porto-Novo, Benin, using multimedia tools and local engagement


The proposed digital platform will document heritage sites across sub-Saharan Africa using multimedia tools such as computer-aided drawings (CAD), photographic documentation, written narratives, audio storytelling, hand drawings, models, and other media. It will engage local communities by building their capacity to collect, preserve, and assess the social value of their built environment, fostering sustained participation in preservation activities. Additionally, the platform will serve as an educational resource, providing access to archival data on cultural heritage sites for researchers, educators, community planners, and citizens both locally and internationally.


A proposal for a pilot project acting as a proof of concept for the broader research will be based in Benin, in the City of Porto-Novo in Benin and will analyze and document the cultural heritage building which is endangered through urbanization, neglect, climate change and other socio economic threats.


Collaborating team: Dr. Franck Komlan Ogou, Dr. Jessica Parr,Dr. Patricia Davis, Bahare Sonaie-Movahed



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