announcements

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Dewey Beach, Delaware

Summer Break

Upon receiving a reminder from WordPress that it’s time to renew my subscription, I looked back and realized I’ve been pretty consistent over the years. Since rebooting this blog in Sept 2017, with few exceptions I’ve fulfilled my goal to write one post per month.

Unfortunately, due to professional and personal constraints I’m going to have to break my streak and put posting on pause for a while. Hopefully I can return to writing in the fall. Until then, enjoy the rest of summer.

Best – Frank

QGIS Example

QGIS 3.16 Tutorial Workbook

I just released a new edition of my introductory QGIS manual for QGIS 3.16 Hannover (the current long term release), and as always I’m providing it under Creative Commons for classroom use and self-directed learning. I’ve also updated my QGIS FAQs handout, which is useful for new folks as a quick reference. This material will eventually move to a Brown University website, but when that happens I’ll still hold on to my page and will link to the new spot. I’m also leaving the previous version of the tutorial written for QGIS 3.10 A Coruna up alongside it, but will pull that down when the fall semester begins.

The new edition has a new title. When I first wrote Introduction to GIS Using Open Source Software, free and open source (FOSS) GIS was a novelty in higher ed. QGIS was a lot simpler, and I had to pull in several different tools to accomplish basic tasks like CRS transformations and calculating natural breaks. Ten years later, many university libraries and labs with GIS services either reference or support QGIS, and the package is infinitely more robust. So a name change to simply Introduction to GIS with QGIS seemed overdue.

My move from Baruch CUNY to Brown prompted me to make several revisions in this version. The biggest change was swapping the NYC-based business site selection example with a Rhode Island-based public policy one in chapters 2 and 3. The goal of the new hypothetical example is to identify public libraries in RI that meet certain criteria that would qualify them to receive funding for after school programs for K-12 public school students (replacing the example of finding an optimal location for a new coffee shop in NYC). In rethinking the examples I endeavored to introduce the same core concepts: attribute table joins, plotting coordinates, and geoprocessing. In this version I do a better job of illustrating and differentiating between creating subsets of features by: selecting by attributes and location, filtering (a new addition), and deleting features. I also managed to add spatial joins and calculated fields to the mix.

Changes to chapter 4 (coordinate reference systems and thematic mapping) were modest; I swapped out the 2016 voter participation data with 2020 data. I slimmed down Chapter 5 on data sources and tutorials, but added an appendix that lists web mapping services that you can add as base maps. Some material was shuffled between chapters, and all in all I cut seven pages from the document to slim it down a bit.

As always, there were minor modifications to be made due to changes between software versions. There were two significant changes. First, QGIS no longer supports 32 bit operating systems for Windows; it’s 64 bit or nothing, but that seems to be fairly common these days. Second, the Windows installer file is much bigger (and thus slower to download), but it helps insure that all dependencies are there. Otherwise, the differences between 3.16 and 3.10 are not that great, at least for the basic material I cover. In the past there was occasionally a lack of consistency regarding basic features and terminology that you’d think would be well settled, but thankfully things are pretty stable this time around.

If you have any feedback or spot errors feel free to let me know. I imagine I’ll be treading this ground again after the next long term release take’s 3.16’s place in Feb / Mar 2022. For the sake of stability I always stick with the long term release and forego the latest ones; if you’re going to use this tutorial I’d recommend downloading the LTR version and not the latest one.

Census Tracts

Call for Proposals: Celebrating the Census in the Journal of Maps

I’m serving as a co-editor for a special issue for the Journal of Maps entitled “Celebrating the Census“. The Journal of Maps is an open access, peer reviewed journal published by the Taylor & Francis Group. The journal is distinct in that all articles feature maps and spatial diagrams as the focal point for studying geographic phenomena from both a physical / environmental and social science perspective.

Here’s the official synopsis for this census-themed special issue:

We invite contributions to a special issue of the Journal of Maps focused upon the evolving character and cartographic opportunities offered by traditional census statistics and the impact of transitioning from these sources of population data at a range of spatial scales into a new era of big data assembly. In so doing, the special issue marks two important events taking place in the UK during 2021 in the history of British Censuses and seeks contributions that reflect the past transition of population data cartography through the digital era of the last 50 years and anticipates its transformation into the big data era of the foreseeable future.

While the issue marks the 100th anniversary of the UK census, submissions concerning census mapping from around the world are welcome and encouraged in these topic areas, including but not limited to:

  • Spatial and statistical consistency over time
  • People on the move
  • Mapping people through space and time
  • Mapping morbidity and mortality
  • Politics and population data
  • International comparison of demographic mapping
  • Before and after population mapping using censuses and administrative sources
  • Population data and mapping human-environmental interaction
  • Transition and evolution in population mapping

Visit the special issue announcement for full details. Deadlines:

  • April 30, 2021: a short draft (500-word limit) outlining themes and scope of the paper, preferably with a sample map
  • June 14, 2021: abstracts will be selected by the editorial team by this date
  • Sept 5, 2021: completed paper (4000-word limit) is due

The issue will be published sometime in 2022.

Brown University on OpenTopoMap

A New Year and a New Start

I have some news! After 13 1/2 years, January 31, 2021 will be my last day as the Geospatial Data Librarian at Baruch College, City University of New York (CUNY). On February 1, 2021, I will be the new GIS and Data Librarian at Brown University in Providence, Rhode Island!

It’s an exciting opportunity that I’m looking forward to. I will be building geospatial information and data services in the library from the ground up, in concert with many new colleagues. I will be working closely with the Population Studies Training Center (PSTC) and the Spatial Structures in Social Sciences (S4) as well as the Center for Digital Scholarship within the library. Several aspects of the position will be similar, as I will continue to provide research and consultation services, create research guides and tutorials, teach workshops, collect and create datasets, and eventually build and manage a data repository and small lab where we’ll provide services and peer mentor students.

The resources I’ve created at Baruch CUNY will remain accessible, and eventually a new person will take the reins. I have moved the latest materials for the GIS Practicum, my introductory QGIS tutorial and workshop, to this website and I hope to continue updating and maintaining this resource. There are a lot of people throughout CUNY that I’m going to miss, at: the Newman Library, the CUNY Institute for Demographic Research, the Weissman Center for International Business, the Marxe School, Baruch’s Journalism Department, the Geography Department at Lehman College, the Digital Humanities program and the CUNY Mapping Service at the CUNY Graduate Center, and many others.

I will continue writing posts and sharing tips and resources here based on my new adventures at Brown, but may need a little break as I transition… stay tuned!

Best – Frank

NYC and NYMA Pop Change Graph 2000 to 2019

New York’s Population and Migration Trends in the 2010s

The Weissman Center for International Business at Baruch College just published my paper, “New York’s Population and Migration Trends in the 2010s“, as part of their Occasional Paper Series. In the paper I study population trends over the last ten years for both New York City (NYC) and the greater New York Metropolitan Area (NYMA) using annual population estimates from the Census Bureau (vintage 2019), county to county migration data (2011-2018) from the IRS SOI, and the American Community Survey (2014-2018). I compare NYC to the nine counties that are home to the largest cities in the US (cities with population greater than 1 million) and the NYMA to the 13 largest metro areas (population over 4 million) to provide some context. I conclude with a brief discussion of the potential impact of COVID-19 on both the 2020 census count and future population growth. Most of the analysis was conducted using Python and Pandas in Jupyter Notebooks available on my GitHub. I discussed my method for creating rank change grids, which appear in the paper’s appendix and illustrate how the sources and destinations for migrants change each year, in my previous post.

Terminology

  • Natural increase: the difference between births and deaths
  • Domestic migration: moves between two points within the United States
  • Foreign migration: moves between the United States and a US territory or foreign country
  • Net migration: the difference between in-migration and out-migration (measured separately for domestic and foreign)
  • NYC: the five counties / boroughs that comprise New York City
  • NYMA: the New York Metropolitan Area as defined by the Office of Management and Budget in Sept 2018, consists of 10 counties in NY State (including the 5 NYC counties), 12 in New Jersey, and one in Pennsylvania
Map of the New York Metropolitan Area
The New York-Newark-Jersey City, NY-NJ-PA Metropolitan Area

Highlights

  • Population growth in both NYC and the NYMA was driven by positive net foreign migration and natural increase, which offset negative net domestic migration.
  • Population growth for both NYC and the NYMA was strong over the first half of the decade, but population growth slowed as domestic out-migration increased from 2011 to 2017.
  • NYC and the NYMA began experiencing population loss from 2017 forward, as both foreign migration and natural increase began to decelerate. Declines in foreign migration are part of a national trend; between 2016 and 2019 net foreign migration for the US fell by 43% (from 1.05 million to 595 thousand).
  • The city and metro’s experience fit within national trends. Most of the top counties in the US that are home to the largest cities and many of the largest metropolitan areas experienced slower population growth over the decade. In addition to NYC, three counties: Cook (Chicago), Los Angeles, and Santa Clara (San Jose) experienced actual population loss towards the decade’s end. The New York, Los Angeles, and Chicago metro areas also had declining populations by the latter half of the decade.
  • Most of NYC’s domestic out-migrants moved to suburban counties within the NYMA (representing 38% of outflows and 44% of net out-migration), and to Los Angeles County, Philadelphia County, and counties in Florida. Out-migrants from the NYMA moved to other large metros across the country, as well as smaller, neighboring metros like Poughkeepsie NY, Fairfield CT, and Trenton NJ. Metro Miami and Philadelphia were the largest sources of both in-migrants and out-migrants.
  • NYC and the NYMA lack any significant relationships with other counties and metro areas where they are net receivers of domestic migrants, receiving more migrants from those places than they send to those places.
  • NYC and the NYMA are similar to the cities and metros of Los Angeles and Chicago, in that they rely on high levels foreign migration and natural increase to offset high levels of negative domestic migration, and have few substantive relationships where they are net receivers of domestic migrants. Academic research suggests that the absolute largest cities and metros behave this way; attracting both low and high skilled foreign migrants while redistributing middle and working class domestic migrants to suburban areas and smaller metros. This pattern of positive foreign migration offsetting negative domestic migration has characterized population trends in NYC for many decades.
  • During the 2010s, most of the City and Metro’s foreign migrants came from Latin America and Asia. Compared to the US as a whole, NYC and the NYMA have slightly higher levels of Latin American and European migrants and slightly lower levels of Asian and African migrants.
  • Given the Census Bureau’s usual residency concept and the overlap in the onset the of COVID-19 pandemic lock down with the 2020 Census, in theory the pandemic should not alter how most New Yorkers identify their usual residence as of April 1, 2020. In practice, the pandemic has been highly disruptive to the census-taking process, which raises the risk of an under count.
  • The impact of COVID-19 on future domestic migration is difficult to gauge. Many of the pandemic destinations cited in recent cell phone (NYT and WSJ) and mail forwarding (NYT) studies mirror the destinations that New Yorkers have moved to between 2011 and 2018. Foreign migration will undoubtedly decline in the immediate future given pandemic disruptions, border closures, and restrictive immigration policies. The number of COVID-19 deaths will certainly push down natural increase for 2020.

atcoordinates YouTube Channel

Video Tutorials for Finding US Census Data

I have recently created an atcoordinates YouTube channel that features a series of how-to videos on finding and accessing US census data using a variety of websites and tools. I explain basic census concepts while demonstrating how to access data. At this point there are four videos:

  1. Exploring US Census Data: Basic Concepts. This is a narrated slide show where I cover the essential choices you need to make and concepts you need to understand in order to access census data, regardless of the tool or platform: data set, time period, subjects or topics, and geography. I discuss the decennial census, American Community Survey, and population estimates. This video is intended as a prerequisite for viewing the others, so I don’t have to explain the same concepts each time and can focus on demonstrating each particular application.
  2. American Community Survey Census Profiles with MCDC Apps. This screencast illustrates how you can quickly and easily access census profiles for any place in the US using the Missouri Census Data Center’s profile applications. It’s also a good introduction to census data in general, if you’re unfamiliar with the scope of data that’s available.
  3. Search Strategies for data.census.gov. I demonstrate how to use the Census Bureau’s primary application for accessing current census data, using the advanced search tool and filters.
  4. Using TIGERweb to Explore US Census Geography. I show you how to use this web map application for viewing census geography, while explaining what some of the small-area census geographies are.

I plan on adding additional videos every month or so. The pandemic lock down and uncertainty over whether classes will be back in session this fall inspired me to do this. While I prefer written tutorials, I find that I’ve been watching YouTube more often for learning how to do certain tasks with particular software, so I thought this would be useful for others. The videos average about 10 to 15 minutes in length, although the introductory one is a bit longer. The length is intentional; I wanted to explain the concepts and describe why you’re making certain choices, instead of simply pointing and clicking without any explanation.

Feel free to spread the news, share and embed the videos in research guides or web pages, and use them in classes or workshops. Of course, for a more in-depth look at US census data, check out my book: Exploring the US Census: Your Guide to America’s Data published by SAGE.