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Credits for the print version of this guide: This publication was made possible by generous support from the James Madison Council , a national, private-sector advisory council dedicated to helping the Library of Congress share its unique resources with the nation and the world. From the Geography and Map Division, Ralph E. Ehrenberg, Gary L. Fitzpatrick, James A. Flatness, Ronald E.
The Harvard Map Collection is one of the oldest and largest collections of cartographic materials in the United States with over 500,000 items. Resources range from 16th century globes to modern maps and geographic information systems (GIS) layers. A selection of our materials has been digitally imaged and is offered both as true picture images and georeferenced copies. This Virtual Collection includes those maps and atlases that are available through the Harvard Image Delivery Service.
The Library of Congress Search by Keyword | Browse by Geographic Location Index | Subject Index | Creator Index | Title Index The Geography and Map Division of the Library of Congress holds more than 4.5 million items, of which Map Collections represents only a small fraction, those that have been converted to digital form.
Introduction GPWv3 depicts the distribution of human population across the globe. GPWv3 provides globally consistent and spatially explicit human population information and data for use in research, policy making, and communications. This is a gridded, or raster, data product that renders global population data at the scale and extent required to demonstrate the spatial relationship of human populations and the environment across the globe.The purpose of GPW is to provide a spatially disaggregated population layer that is compatible with data sets from social, economic, and Earth science fields.The gridded data set is constructed from national or subnational input units (usually administrative units) of varying resolutions. The native grid cell resolution is 2.5 arc-minutes, or ~5km at the equator, although aggregates at coarser resolutions are also provided. Separate grids are available for population count and density per grid cell.
Watch the sun rise and set all over the world on this real-time, computer-generated illustration of the earth's patterns of sunlight and darkness. The clouds are updated every 3 hours with current weather satellite imagery. <a href="http://www.die.net/earth/?zoom=2"><img src="http://static.die.net/earth/mercator/1600.jpg" width="100%" alt="[World Sunlight Map: mercator projection]"></a>