Category Archives: GIS

New U.S. Datum Requires Location Corrections

A new datum or geospatial reference system is being introduced in the United States to become the official datum in 2022.  Pam Fromhertz of the NOAA National Geodetic Survey gave an overview of the reasoning behind the new datum, technical … Continue reading

Posted in earth, GIS, map making | Leave a comment

Concept and Applications of Digital Elevation Model (DEM)

A digital elevation model (DEM) is a digital model or 3D representation of a terrain’s surface — commonly for a planet (including Earth), moon, or asteroid — created from terrain elevation data. In most cases the term digital surface model represents the earth’s surface and includes … Continue reading

Posted in Class Notes, earth, GIS, Remote Sensing 101 | 1 Comment

Synthetic Aperture Radar Using ‘Inflation’ Monitoring could Predict Volcanic Eruptions

The world’s deadliest and largest volcanic eruptions happen in Indonesia. Future eruptions in this jungle-filled region could be better predicted by using satellite radar to detect swelling magma near the summit of those volcanoes, a new study suggests. To search … Continue reading

Posted in GIS, opinions, Remote Sensing 101, Satellites, Volcanoes | Tagged , , , | Leave a comment

New York Utilized its Open Data Platform and Social media to Map Evacuation info for Hurricane Sandy

Social media played a pivotal role in disaster management of Sandy.The City of New York utilized its Open Data platform to help residents deal with the effects of Hurricane Sandy. The effort, which was part of the Digital Road Map … Continue reading

Posted in GIS, map making, Natural Calamities, Urban Studies | 1 Comment