Earth Imaging Journal: Remote Sensing, Satellite Images, Satellite Imagery
Breaking News
Space Foundation Opens Registration for 37th Space Symposium, To Be Held April 4-7, 2022
COLORADO SPRINGS, Colo.  — Space Foundation, a nonprofit advocate...
UP42 Joins the BDI NewSpace Initiative on Its Mission to Foster the German Economy and Innovation
The Berlin-based geospatial start-up becomes an official member of...
Introducing TomTom IndiGO: The world’s first open digital cockpit software platform for carmakers
AMSTERDAM - TomTom (TOM2), the geolocation technology specialist, today...
BlackSky Continues Aggressive Business Expansion Adding Two Satellites with Upcoming SpaceX Launch
HERNDON, Va.- BlackSky (NYSE: BKSY) will soon add two additional satellites...
Skytec Selects Esri Technology to Power New Precision Conservation Management Application
Startup's Ranger App Uses Cloud-Hosted Drone and Satellite Imagery...

An astronaut aboard the International Space Station (ISS) took this photograph of the Betsiboka River Delta in Madagascar. The braided Betsiboka River carries sediment from the island’s high central plateau and mountains toward the western coast, where it empties into Bombetoka Bay and the Mozambique Channel. The delta is comprised of complex woven channels flowing between vegetated islands of built up sediment.

Historical maps of Madagascar describe the sandy to clay-rich soils around the Betsiboka River as terres rouges, or “red lands.” (The island was a French territory from 1895 to 1960.) They were describing laterites—soils rich in iron oxides—that form in tropical climates from the chemical breakdown of iron-rich rocks. These soils and sediments lend the river a rusty orange color when the island experiences heavy seasonal rain or downpours from tropical cyclones.

The heavy sediment loads in the waters are also a result of extensive deforestation on the island since the 1950s. Since that time, at least 40 percent of Madagascar’s forest cover has been cut down. Slash-and-burn agricultural practices, livestock overgrazing, and wildfires have dramatically altered the island’s mangrove forests. So the Betsiboka River now cuts across thick, unstable soils that are prone to erosion.

Mangrove trees create the dark areas within the small lenses of land. Mangroves thrive in estuaries, where salty sea water mixes with fresh water from the Betsiboka. The landscape helped Madagascar develop rich biodiversity, with a high number of plant and animal species endemic only to the island.

Photo Credit: ISS Crew Earth Observations Facility and the Earth Science and Remote Sensing Unit, Johnson Space Center

Comments are closed.