Monday, November 13, 2017
This is an image of Cambodia which shows a flooded region between the Mekong River and the Tonlé River. The image was taken by the Japanese satellite, ALOS, on May 5th, 2015. The Mekong River is one of the best resources of protein/fish for the surrounding communities. The Tonlé River changes the direction of flow depending on the season. During the dry season it flows south, which contains the months of November through May. During the wet season it flows north which contains the months of June through October. During the wet season the river level rises and causes flooding which then forms a large body of water between the two rivers. The flooding helps to increase fishing since the surface area of the Mekong increases by over six times in the process.
This image is from the Sentinel 2A satellite over Northwestern India. The region, known as the Rann of Kutch, is a salt marsh that is flooded during the monsoon season in summer and reverts to aridity in the winter months. The image is false color, presumably NIR, Red, and Green. As such, there is a distinct line between the vegetated grasslands, in red, on the bottom half of the image and the salt deserts, in white, on the top half of the image. Most notably the rectilinear pools of blue are the result of different minerals being extracted in the area. Considering that the whitest areas are arid and salty, the more blue there is in the image the more abundant other minerals in that area. The grasslands were formerly fed by the Indus river until its course was altered during an earthquake in the 20th century. As a product of human processes increased drought, overgrazing, and invasive species threaten the stability of the grasslands.