New Online Map Allows the Detailed Scrutinizing of U.S. Households
Demographic trends in the U.S. have always been a tradition and a wealth of information. After all, the United States government conducts an official census … Read more
Assessing a School’s Economic Background Using GIS
I do pro bono GIS work from time to time, and a recent contribution was towards a local school that was undergoing a capital campaign … Read more
California Supreme Court Rules that GIS Data are Public Record
After a lengthy battle in the court system, California’s Supreme Court has finally ruled in favor of allowing public access to the government’s GIS data in Orange County. Back in 2007, the Sierra Club sued the county for the right to use its GIS data for environmental mapping projects. Orange County resisted, however, claiming that the digital maps did not fall under the Public Records Act.
FEMA Flood Map Challenges
FEMA has been constantly updating and maintaining its Flood Hazard Mapping Program in order to provide ongoing flood risk assessments.
Explore 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 although his famous dot map was actually created after the cholera epidemic to show disease clusters. Â
Attribute Data Types for GIS
There are two components to GIS data: spatial information (coordinate and projection information for spatial features) and attribute data. Â Attribute data is information appended in … Read more
World GIS Data
Looking for global GIS data? Listed here are free sources for finding GIS data in both vector and raster formats including satellite imagery. Natural Earth … Read more
Where is the Phrase “80% of Data is Geographic” From?
Those that work in GIS data have probably heard the phrase “80% of data is geographic”. What is the origins of this phrase, and is it true?
SDTS – GIS Data Standard
SDTS stands for Spatial Data Transfer Standard.  SDTS was a standard for transferring earth-referenced spatial data across disparate computer programs.  The U.S. Geological Survey (USGS) released SDTS … Read more
Data Capture in GIS
This article provides a brief overview of the GIS data collection process along with examples of methodologies for GIS data capture. Pre-processing Data in GIS … Read more
GIS Data Resources by Country
A | B | C | D | E | F | G | H | I | J | K | L | M … Read more
1940 U.S. Census Records Release Date Nears
The detailed records from the 1940 U.S. Census are set to be released on April 2, 2012 at 9am Eastern Time. Â In additon to the … Read more