Cornell University Library Guides
Google Maps, Google Earth and the New Geography - provides an introduction to the mapping services provided by Google.
Geolytics - introduces the Cornell University Library holdings of Geolytics products.
Historical Census and Ward Maps - provides information on locating and using historical census and ward maps using the resources available at Cornell University as well as selected online resources.
Google Maps Latitude/Longitude Popup - Simply click on the map on a location and it will provide you with the latitude and longitude in the callout window.
Interactive unit converter - online conversions for many measurement systems. Conversion tables are provided for both common (U.S., metric, etc.) and quite exotic units like Ancient Greek and Roman.
Great Circle Calculator – direct-line distances between two points of latitude and longitude .
Surface Distance between two points of latitude and longitude; also provides Great Circle Distances between select cities.
Sailing distances between United States ports – publication of the National Oceanic and Atmospheric Administration.
Sailing distances between departure ports, junction points, and arrival ports worldwide, organized alphabetically.