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Mapping Radon in Pennsylvania's Groundwater Mapping Radon in Pennsylvania's Groundwater

Radon, a colorless and odorless gas, is commonly found in groundwater in Pennsylvania. This web tool allows interactive display of Pennsylvania Water Science Center measurements of radon in groundwater samples from wells. All data presented here is publicly available and a data download tool is provided that will output all currently-displayed data.

Landsat 4 Overview Landsat 4 Overview

Landsat 4 was launched on July 16, 1982, with joint control of the program by NOAA, NASA, and the U.S. Geological Survey. Each federal agency took on a different role.

Landsat 3 Overview Landsat 3 Overview

Although only two Landsats were originally anticipated, the program’s principal scientists sought to launch a third satellite for continued coverage because they found a wide variety of applications for the data. There was also interest in advancing the sensors and improving the data.

Landsat 1 Overview Landsat 1 Overview

A long string of Earth-observing orbiters began with NASA's Earth Resources Technology Satellite (ERTS). Launched in July 1972, it was the first satellite explicitly designed to study our planet. Three years later, the satellite was renamed Landsat 1. Outlasting its one-year design, Landsat 1 retired in January 1978.
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