Understanding Map Scale
Map scale refers to the ratio between the distance on a map and the corresponding distance on the Earth’s surface.
Overview of Elevation Data
This article reviews some of terminology and types of elevation based datasets available to GIS.
GIS 101: Learn About GIS
This GIS 101 page is the launch page for accessing information about GIS and geospatial technologies on GIS Lounge.
GIS Data: A Look at Accuracy, Precision, and Types of Errors
What are the types of error found in GIS data? This article reviews the difference between accuracy and precision and explains the most common types of error found in GIS data.
Types of GIS Data Explored: Vector and Raster
This article discussions different types of GIS data in both vector and raster formats.
GDAL: Geospatial Data Abstraction Library
The Geospatial Data Abstraction Library (GDAL) is a set of software tools used by GIS platforms such as ArcGIS, QGIS, and GRASS GIS.
Understanding and mapping ZIP Codes
Resources for accessing ZIP code data. Ben Fry has created zipdecode that shows the location of all the ZIP codes in the United States.
World Bank and Geospatial Data
The World Bank in August 2018 launched the Integrated Geospatial Information Framework, which is seen as a way for GIS data to be provided for governments, NGOs, and companies to make more informed decisions that not only benefit their economies but also enable sustainable development.
Free Urban Planning GIS Book and Exercises
An open access book focusing on the use of GIS in sustainable urban planning and management includes six chapters containing exercises and GIS data.
GIS Data
GIS data info, exploring geographic data types (vector/raster), data errors, metadata, and online GIS data sources.
Free GIS Data Viewers
Free data viewers for a variety of GIS data formats. These viewers allow you to display geographic data as well as perform some basic GIS functions.
GIS File Formats
Listed here are some of the more common file formats along with associated file extension for GIS file types.