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The NYC Space/Time Directory: Building the Future of NYC’s Past


Two years ago, we had a crazy idea: what if we could make the maps of New York City’s past work like the maps of today? Could we create, for example, a searchable atlas stitched together from the pages of old maps—like Google Maps, but with a time slider? A location directory that helps you find historical place names, streets and addresses? A new way to discover our collections in historical and geographic context?

Talman Street, no. 57, Brooklyn
Brooklyn’s Talman Street in 1936, demolished for the construction of the Brooklyn-Queens Expressway. Image ID: 482809

As we thought about it more, we realized that maybe this idea wasn’t so crazy; the Library’s collections, after all, contain all the materials needed—maps, photographs, business directories, census data, oral histories, even menus—to create such a system. Whereas in the past you had to come to the Library in person and schedule an appointment to view all these materials, it’s now possible to browse hundreds of thousands of them online, digitized, in high resolution in our Digital Collections. And we didn’t stop there: items in Digital Collections are still just images, you cannot search their content—labels on maps, names and addresses in city directories or the locations where photos were taken. With online crowdsourcing tools like What’s on the Menu? and Building Inspector, we have created ways to extract information from our collections and turn them into data, for everyone to use.

Only one thing is missing: a system which links all these collections and their data, and makes them searchable and accessible through space and time.

[Map bounded by 12th St., Ashburn St., Newtown Creek, East River]
Long Island City in 1913; more railroad tracks and less luxury condominiums. Image ID: 1954547

The NYC Space/Time Directory

Thanks to generous funding from the John S. and James L. Knight Foundation, we were able to start designing and building this system: the NYC Space/Time Directory, a digital time-travel service for New York City, created using the collections of the Library.

Bringing the NYC Space/Time Directory to life is no easy task, and it won't happen all at once, so we'll be unveiling new tools and features as we develop them. Today we are excited to share with you the first fruits of our labor: Maps By Decade, and a new project website where we are publishing historical open data sets.

Maps by Decade

Maps by Decade is a new way to view more than 5,000 digitized street maps of New York City from our collection, published between 1850 and 1950. Over the past seven years, our librarians and patrons have used Map Warper to place more than ten thousand of our digitized historical maps on the correct location on a map of today’s New York by stretching and rotating them, a process which is called georectification.

Map images by decade
Maps by Decade

With Maps by Decade, finding and viewing georectified maps is easier than ever. Use Maps by Decade to browse and compare the streets of New York City, one decade at a time. See how your neighborhood looked in a hundred years ago, and download maps in high resolution, most of which are available in the public domain.

Historical geospatial open data

Maps by Decade is built using a dataset containing the outlines and location of maps from Map Warper. This dataset, along with many others, can be downloaded from the website of the NYC Space/Time Directory. Historical buildings and addresses from Building Inspector, locations of historical street photography from OldNYC, 18th century ward boundaries: all this data, from different collections and research divisions or the NYPL, is now available in one place, and in one format.

dataset drawing
Dataset with outlines of Map Warper maps, visualized with QGIS

Currently, the NYC Space/Time Directory contains the following data:

  • 8,000 maps

  • 180,000 historical addresses and buildings

  • 40,000 georeferenced photos

  • 700 historical streets

  • 800 churches

Diagram showing how data is processed and published in the NYC Space/Time Directory

Stay in Touch

Over the coming months, more tools and datasets will be released, as well as tutorials and documentation on how to interact with the NYC Space/Time Directory. Keep an eye on the project’s website or follow NYPL on Twitter to stay up to date. Developers and others interested in the project’s source code can visit GitHub to browse the many open source repositories that make up the NYC Space/Time Directory.

The NYC Space/Time Directory also has its own meetup series: Historical Maps & Data at NYPL. Designers, coders, historians, genealogists, librarians and archivists alike, we're inviting everyone interested in the history of New York City to meet and listen to talks about historical data and the NYC  Space/Time Directory project. So far, we have organized two events: one on city directories and one on historical addresses and buildings; more will follow this spring, summer, and fall. As we schedule new meetups, they will be posted on the project's website and on

Do these datasets and tools help you with research? Explore our collections in new ways? Enable you to make a new app?  Or do you have any questions regarding our datasets? Let us know! We'd love to hear how you're using the NYC Space/Time Directory!


Patron-generated content represents the views and interpretations of the patron, not necessarily those of The New York Public Library. For more information see NYPL's Website Terms and Conditions.


Congratulations, and thank you! This looks like a fantastic way to access the huge range of materials the NYPL has, and has worked to make publicly accessible. Lots of us out here look forward to your next steps. I'm working with the Whats on the Menu data to map oyster provenance and consumption in Manhattan restaurants. There may even be ways to construct an oyster price index, allowing some speculation about the role of consumer preference vs. price in the rise and collapse of oysters on the menu.

Hi Matthew,

Hi Matthew, Thanks for your comment! More tools and datasets are coming soon! Bert

Scheduled meetups

I'm very interested in the mapping project and would love to come to the talks. But I'm not in NYC. I'm wondering if you will be recording them at all?

Recording meetups

Hi Theresa, Unfortunately, we're not able to record the meetups - we are using different locations for each meetup, and bringing video equipment is not feasible. I'm sorry! Bert


I am in interested in knowing if there will be lectures or sessions about the history of NYC

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