MapCarte 356/365: The Nolli Map by Giambattista Nolli, 1748

MapCarte356_nolliThe Italian architect and surveyor Giambattista Nolli is perhaps best known for his epic ichnographic plan of Rome, known as the Nolli map. He began his exhaustive survey in 1736 and eventually engraved and published the map in 1748 across twelve sheets measuring 176cm by 208cm when pieced together. The map was effectively commissioned by Pope Benedict XIV as a way to map and subsequently demarcate Rome into 14 districts. The detail of the map reflected the architectural achievements of Rome and of the Papacy itself of the time.

MapCarte356_nolli_detailThe map is a phenomenal achievement of technical work and of detail and precision. It also incorporates some interesting design choices, not least the orientation of east to magnetic north to reflect the use of the compass to determine bearings in relation to the city’s layout. In terms of depiction, the map illustrates the importance of figure-ground in cartographic design. Nolli followed a previous work, the Bufalini map of 1551, which shaded buildings and other features in dark while ensuring open spaces were white. Additionally, he maps the various colonnades of important public spaces such as St. Peter’s Square in black, almost in the style of an architectural blueprint.

MapCarte356_nolli_detail2While the map undoubtedly has historical significance both in the mapping of Rome and also as a scientific and technical achievement, the contribution to cartography is also hugely important. The dark grey hachuring for the buildings highlighted the importance of colour, depth, contrast and texture in defining visual contrast. Nolli used black to indicate monuments and white outlines to show the locations of ancient monuments that no longer exist. S-shaped curves were used to denote contours and slopes which was before contours were used more commonly to illustrate elevation. A waterlining effect was used as a vignette for the river and various symbols used to show locations of other features with qualitative differences indicated through design (e.g. open and closed drains). The use of precise illustrative symbols was rare in maps of the time.

You can read more about the Nolli map, and view an online archived version, at the Interactive Nolli Map website here.

MapCarte 354/365: Urban Forest by OOM Creative, 2013


Click image to view the web map.

Melbourne’s Urban Forest Visual by OOM Creative is simply conceived and well built. There’s nothing pretentious or bloated about the map and it’s clean and elegant approach to mapping every tree in the city of Melbourne is a template for the use of modern web maps. The web site houses the embeded map so there’s no going to a separate site. The User interface is uncluttered and intuitive. The overall design builds on a limited but effective colour palette that repeats across the map and the site itself. The use of a dark basemap and bright colours creates a pleasing contrast between background and detail.

The map shows the location of every tree recorded by a census and categorises them by genus using different shapes. Almost immediately, this simple act of making the effort to categorise point data and show them differently takes this web map further than many similar maps that might just show the presence of a phenomena or not. Binary web maps are common (things exist and are shown, or they don’t). OOM Creative have thought cartographically about the work. Further, the symbols are coloured to indicate the remaining lifespan of the tree. Immediately, you can see where streets are populated with the same genus of tree creating a particular uniform scene, or perhaps where their is a rich variety. It’s easy to spot the botanical gardens! It’s also easy to see the spatial pattern of the health of trees and where resources perhaps need to be targeted for remediation or replanting in the coming years.

You can modify the map view to focus on the detail at a precinct level and also select a subset of the data to show trees by age or by use. The map forms part of a larger story about the Melbourne canopy and conservation efforts. It’s an educational web site of which the map forms a core component. Perhaps the most endearing aspect of the map is, in addition to clicking on each tree to reveal information, you can ’email a tree’. Designed as a way for people to report tree health, damage or other information, it has also been used as a simple way of communication to express to a tree how important it has been, or any range of other eccentric human reactions. In this sense the map provides a fascinating way for people to interact with their environment in an emotional way.

You can see the web map as part of the Urban Forest Visual web site here.