Promoting the heritage of the city of San Cristobal de La Laguna through a temporal link with a 16th century map

Abstract

There is an increasing interest in the conservation of historical cities since they provide a link to the roots of their communities and bring cultural and economic benefits to their inhabitants. In this paper, we present an approach to promote the knowledge of the UNESCO World Heritage city of San Cristóbal de La Laguna in the Canary Islands, Spain. The city was founded in 1496 and has a unique value due to its urban design. In this work, we present a web application that allows a user to locate places and addresses of the current city in its first known map authored by Leonardo Torriani in the 16th century. To build this application we have georeferenced the ancient map in the current cartography. The georeferencing process needs the identification of homologous ground control points in the coordinate systems of both the old map and the current cartography, and the definition of a transform between them. Best results were obtained with the non-parametric natural transform interpolation leading to a global mean error of 4.9 m that reduces to 3.2 m in the historical city centre. To provide a fast response to the user of the web application, a technique to precompute offline the natural transform is presented. The web application has a simple front-end where the user fills the current city address in a form. This activates a query to obtain the geographical coordinates of the address that are transformed to map coordinates using the pre-computed transformation. These map coordinates are used by a map viewer in the front end that locates the user address in the ancient map. To test the performance of the web application, the load of the system has been analysed obtaining a latency of 1.4 s in 50 concurrent users. Results show that the web application provides accurate results in the historical centre while providing satisfactory response times.Highlights:- This study investigates the issue of georeferencing the first historic map (16th century) of San Cristóbal de La Laguna and the possibility to geolocate current city addresses.- By using the natural interpolation method, the georeferencing errors were diminished below 4 m in most of the historic city.- A user-friendly web application has been designed which precisely locates current directions in the old map providing a valuable tool for the promotion of the heritage of the city.

LagunAR: A City-Scale Mobile Outdoor Augmented Reality Application for Heritage Dissemination

“…These 2D map layers were subsequently transformed into 2D geographical coordinates using a georeferencing technique [36], aligning the digitized image of the map or aerial photo with a geographic coordinate system. By identifying a set of common reference points shared by both coordinate systems, signifying their geographical equivalence, 563 Ground Common points were designated on the map, including the block and crop polygons [63]. Then, the corresponding pairs from the historical map were located within modern cartography with the aid of OpenStreetMap data [64] and the PNOA orthophoto for the city [39].…”

Do geographic location and historical conditions affect the quality and availability of open cadastral data? From early cadastral maps till now

“…At present, the Spanish cadastre characterizes by a division that corresponds to the assumptions of the Integrated Cadastral System (Modelo uni cado de catastro). The cadastral data are collected by the Internet Cadastral Service (Sede Electronica del Catastro) (Femenia-Ribera et al, 2022;Nava et al, 2022).…”

Kepraktisan Pengembangan Media Ajar IPS Berbasis Video Interaktif

“…Soal-soal tersebut juga dapat dirancang fokusnya, misal agar membahas tentang budaya di Sumatera (Megawaty et al, 2021). Secara umum media peta yang dikombinasikan dengan budaya sekitar juga dapat mempermudah para siswa untuk segera mengetahui letak secara pasti budaya-budaya tersebut (Nava et al, 2022). Cara ini juga memungkinkan para siswa untuk memprediksi daerah mana saja yang mungkin masih memiliki budaya serupa sehingga mereka benar-benar mengembangkan tahap berpikir analitis mereka.…”