Remote Sensing Terminology
The Landsat program is a series of American satellites that use the visible and infrared parts of the spectrum to record images of the Earth's surface. It is the longest running enterprise for acquisition of satellite imagery, and started back in 1972. The most recent, Landsat 8, was launched in 2013.
Landsat satellites are located in a polar orbit, which allows them to provide images of almost all of the Earth's geography. As the satellite orbits the Earth from pole to pole, it appears to move from east to west because of the Earth’s rotation. This apparent movement allows the satellite to view a new area with each orbit.
Determining land cover has become one of the most common uses of Landsat Imagery and remotely sensing generated images all around the world.
The LiDAR sensor produces a series of point measurements that consists of geographic location (X & Y) and height (Z) of both natural and man-made features, and can be further processed to produce several different products and integrated into a Geographic Information System (GIS).
Click here to learn more about LiDAR
The amount of energy returning to the sensor (known as backscatter) is dependent upon the topography, roughness, and dielectric properties (moisture). Areas of an image with low backscatter appear dark (such as water), while areas of high backscatter appear as light gray levels approximating white shades. By interpreting the various gray tones, textures and patterns, the user can detect information regarding to the regions geologic lithology and structure.
In much of remote sensing, the process involves an interaction between incident radiation and the targets of interest. This is exemplified by the use of imaging systems where the following seven elements are involved. Note, however that remote sensing also involves the sensing of emitted energy and the use of non-imaging sensors. Click here to learn more about Remote Sesning
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Well after a lengthy wait and battle to get the Nicaraguan Customs to finally get all their paper work sorted (or what ever the problem was) and release our equipment to us, we were able to get to work. And stop pretending to be American tourists or Gringos as the slang term here is.
We rented a hanger at the airport to use while we installed our LIDAR equipment onto the helicopter. Well actually it was more so a shelter from the sun then a traditional aircraft hangar as we would define it back home (… but glad to have it none the less).
Even came with indoor plumbing facilities :) although maybe not up to North American Standards. And I am sure it would never get used by any of the females that I know, or to tell the truth I couldn’t picture anybody using it !! .
Now that all was back in order as far as equipment is concerned and we have had the grand tour of this Central American paradise (or the western side of it) it is off to the Wild’s of Nicaragua along the east coast. Oddly enough I have not heard anything good about Rio Blanco nor any the other interior areas from anybody here in the city. People around here in Managua tell us that we will need hammocks, mosquito nets, a good 4×4, plus need to bring all of our own supplies etc. etc.
Maybe it will be a real Jungle expedition just like in the movies … “Indian Jones and the Raiders of the Lost Arc adventure here I come” …