GIS Data

This category contains introductory text about GIS data such as types of error in GIS datasets, types of GIS data (raster and vector), and metadata.

Google's Earth Engine Data Catalog lets users discover public geospatial datasets.

Find Public GIS Data with Google’s Earth Engine Catalog

Caitlin Dempsey

The Earth Engine Data Catalog lets users search and discover Earth observation public datasets.

PurpleAir provides crowdsourced air quality measurements.

A Review of the State of Crowdsourced Geospatial Data

Caitlin Dempsey

A review in the Journal of Remote Sensing provides an updated look at the benefits and concerns when it comes to collaborative geospatial data collection.

A grayscale map with dots to show the locations within the United States that are mapping urban heat.

Mapping Heat in U.S. Cities

Mark Altaweel

NOAA has been coordinating an effort to map urban heat islands in cities across the United States.

Marina del Rey area on a county map of the state of California.

Understanding Map Scale

Caitlin Dempsey

Map scale refers to the ratio between the distance on a map and the corresponding distance on the Earth's surface.

A series of three images: top is a gray shaded relief, middle is a black and white contour image, and the bottom is a digital elevation model in shades of red with darker red indicating higher elevation.

Overview of Elevation Data

Jeff Oppong

This article reviews some of terminology and types of elevation based datasets available to GIS.

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