Tag: gis data
The Map Myth of Sandy Island
Sandy Island has long appeared on maps and in GIS data. A research vessel in 2012 visit the supposed site of Sandy Island and discovered wide open ocean. How did this map myth originate?
John Snow’s Cholera Map using GIS Data
John Snow’s well known cholera map is often cited as one of the earliest known examples of using geographic inquiry to understand a health epidemic. Starting on August 31, 1854, an outbreak of cholera hit the London district called Soho. Over the course of three days, 127 people died from the disease and by September [...]
United States GIS Data and Maps
Looking for free and downloadable GIS data for the United States? Listed here are sources of free and downloadable data by state. Got a GIS data resource? Fill out the information on the contact page or send an email to editor@gislounge.com. Nationwide GIS Data and Maps Data.gov is the GIS data depository for U.S. government data [...]
Attribute Data Types for GIS
There are two components to GIS data: spatial information (coordinate and projection information for spatial features) and attribute data. Attribute data is information appended in tabular format to spatial features. The spatial data is the where and attribute data can contain information about the what, where, and why. Attribute data provides characteristics about spatial data. [...]
Christmas Maps and GIS
The biggest mapping fun at Christmas time is NORAD’s Santa tracking. The tracking started back in 1955 when a Sears department store misprinted the number children could call to get updates on Santa’s whereabouts. The number instead went through to the Colorado Springs’ Continental Air Defense Command (CONAD) Center. The then Director of Operations at the time, [...]