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Subject: Geodesy

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Elevation correction and the geoid tutorial

The Earth is not a perfect sphere, but is instead more like a slightly squashed sphere called an ellipsoid. Because of this, GPS receivers must use a correction model (called a geoid) to calculate ...

The geoid and receiver measurements tutorial

This web page explains how differences in the gravity at different places on Earth requires GPS receivers use additional corrections to find the true elevation of places on Earth's surface. The ...

Selective availability and the GPS receiver tutorial

This website explains how the process of selective availability is used by the USA government to limit the accuracy of locations determined by GPS receivers.

InSAR: What it is and why you should care

Matthew Pritchard
Provides an overview of what Interferometric Synthetic Aperture Radar (InSAR) is and how it is used to measure surface motion for a variety of geoscience fields. Based on an article originally ...

GRACE: Tracking water from space

This 7-minute video gives an overview of the GRACE (Gravity Recovery and Climate Experiment) satellites and explains the technique of using gravity to measure mass movement such changing as ice and ...

USGS Geophysical Data Products

Crustal Imaging and Characterization Team
This website contains links and listings of digital geophysical products spanning the regional centers of the USGS. There are surveys and reports on magnetic, gravity, and other forms of data. There ...

Images: Visualizing Data

Available on this site is a host of images, maps, and animations derived from bathymetric and topographic data. Static images and maps include those of estimated seafloor topography from satellite ...

RIDGE Multibeam Synthesis Project

An online database of multibeam images and digital terrain models of the ocean floor. Users preview ridge system data by clicking on a map or by selecting from a drop down list. About 15 ridge ...

GPS data for educators

Looking for interesting data to use in your course? UNAVCO has worked with educators and scientists to identify GPS stations that illustrate various Earth science processes. The data are the same ...

CLICK: USGS Center for LIDAR Information Coordination and Knowledge

This is the the USGS clearing house for LiDAR data and information. The goal of Center for LIDAR Information Coordination and Knowledge (CLICK) is to facilitate data access, user coordination and ...


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