Data & Resources

McKeldin Map Collection

The map collection at McKeldin Library is located on the fourth floor.  We have over 350,000 maps, most of which were produced by U.S. government agencies and came to us through the Federal Depository Library Collection.  Coverage includes all of the U.S. states, most of the U.S. territories and possessions, and some areas outside of the United States.

• Maps Collection Guide
• Map Collection Floor Plan

Maryland Maps

Find these in the Maryland Room at Hornbake Library or via the Maryland Map Collection website.

Map Databases

• Digital Sanborn Maps (all 50 states and DC!)
• Simply Analytics

Foreign Maps

• CIA Maps Inventory

• Additional foreign maps:

  • Foreign Maps - A
  • Foreign Maps - B
  • Foreign Maps - C
  • Foreign Maps - D 
  • Foreign Maps - E
  • Foreign Maps - F
  • Foreign Maps - G
  • Foreign Maps - H
  • Foreign Maps - I
  • Foreign Maps - J
  • Foreign Maps - K
  • Foreign Maps - L
  • Foreign Maps - M
  • Foreign Maps - N
  • Foreign Maps - O
  • Foreign Maps - P
  • Foreign Maps - R
  • Foreign Maps - S
  • Foreign Maps - T
  • Foreign Maps - U
  • Foreign Maps - V
  • Foreign Maps - W
  • Foreign Maps - Y
  • Foreign Maps - Z
  • Foreign Maps - Moon, Mars

  Collections

  • Topographic maps
  • State Maps
  • State-City Maps
  • Soil maps
  • Maryland Geologic Maps
  • Geologic Atlas of the U.S. Folios
  • Thematic maps

Digitized maps

• Brown University John Carter Brown Library Map Collection
• David Rumsey Map Collection at Stanford University Libraries
• Harvard Digital Map Collection
• Library of Congress Maps Collection
• New York Public Library NYC fire insurance, topographic, and property maps
• Old Maps Online
• Perry-Castañeda Library Map Collection at the University of Texas at Austin Libraries
• University of Wisconsin at Milwaukee Digital Maps Collection
• USGS Topo View

Earth sciences

• USGS Earth Explorer – Satellite data and aerial photography
• USGS Global Visualization Viewer – Satellite data and aerial photography
• UMD Global Forest Change – Interactive web map of global forest cover dynamics
• PRISM Climate Data – Gridded daily precipitation totals, min/max/mean temperature, mean dew point, min/max vapor pressure deficit, and vapor pressure for the U.S. at 4 km resolution; select datasets at 800 m
• Oak Ridge National Lab Daymet Weather and Climate Data – Gridded daily min/max temperature, precipitation totals, water vapor pressure, shortwave radiation, snow water equivalent, and day length for the U.S. at 1 km resolution

Human geography

• Brown University Longitudinal Tract Database (LTDB) - Longitudinal, tract-boundary consistent census dataset from 1970-present. Includes race and Hispanic origin, age by race and Hispanic origin, household composition, and housing occupancy and tenure plus socioeconomic characteristics from the American Community Survey. See the associated variable codebook.
• ESRI’s Tapestry Project - Classification of U.S. residential neighborhoods into marketing segments based on demographic and socio-economic data
• Global Administrative Areas – Administrative boundaries
• History Quest DC - Interactive GIS map with historical data on approximately 127,000 extant buildings in Washington, D.C.
• Mapping Inequality: Redlining in New Deal America - Home Owners' Loan Corporation (HOLC) georeferenced maps and polygons from 1935-1940 for a variety of cities in the United States. HOLC recruited mortgage lenders, developers, and real estate appraisers to create maps that color-coded credit worthiness and risk.
• NASA Night Lights – Nighttime images of Earth’s lighted areas
• NASA SEDAC’s Population Data – Gridded global population data from 1990 - present
• National Historical Geographic Information System - Population, housing, agricultural, and economic data with boundary files in the United States from 1790 to present
• New York Public Library's (NYPL) Navigating The Green Book - The Green Book was a travel guide published from 1936-1966 that listed locations welcoming black travelers. The site offers a map of extracted data and an interactive trip mapping tool.
• Oak Ridge National Lab Landscape Population Data (UMD Subscription) – Gridded global ambient population data from 2000 – present
• Rich Blocks Poor Blocks – Interactive web map of select popular census datasets
• Simply Analytics (UMD Subscription) – Simplified GIS pre-loaded with census and business datasets
• U.S. Census Maps and Data – Census GIS data, maps, and interactive web maps
• World Database of Large Urban Areas – Population estimates and projections for the largest urban areas from 1950-2050

Interdisciplinary

• NASA Earth Data – Gridded atmosphere, cryosphere, human dimensions, land, and ocean datasets
• Natural Earth Data – Administrative boundaries, transport, urban, time zones, parks, coast, hydrology, land cover features, and base map data at three available scales
• United Nations Food and Agriculture Organization -  Administrative boundaries, agriculture, base maps, resources, climate, health, hydrology, land cover/use, population, edaphic, and topographic data
• Diva GIS - Administrative, transportation, elevation, land cover, population, and gazetteer data by country

• Maplandia/Google Maps
• National Geospatial-Intelligence Agency (NGA)
• U.S. Geological Survey (USGS)
• Census
• The Getty
• United States Board on Geographic Names (BGN)

• UCLA Institute for Digital Research and Education (IDRE) - Choose the correct statistical test with sample code in SAS, STATA, SPSS and R
• RStudio Cheat Sheets - At-a-glance assistance for popular RStudio packages
• Cross Validated - A forum for statistics, machine learning, data analysis, data mining, and data visualization questions

• Color Brewer - Advice for cartography, focus on functional color schemes and color blindness
• XKCD Map Projections - A lighthearted overview of map projections
• USGS Map Projections - A more serious overview of map projections