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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This trip was not my first trip to the Canadian north (I had been to Yellowknife before) but it was my first time I had ever been to the Nunavut Territory and also the highest latitude (67 degrees north) that I have been to.
The scope of this trip was to survey an all weather road that would pass through several mine sites in the Canadian north and connect them to a new port to be built in Bathurst Inlet up on the Arctic Ocean. We were based out of Jericho Diamond Mine site in the Kitikmeot Region for the job because of the central location and the services offered at the facility. The mine is located about 400 km northeast of Yellowknife with no roads connecting it to any other places.
I am sure that Nunavut is probably one of the least traveled places by most Canadians maybe because it is so remote with no roads (or very few) connecting it to the rest of Canada making it very hard to get around. Due to the lack of the roads in this area, I almost always traveled by helicopter ( … sometimes by plane). Flying everywhere high above the Earth certainly provides a much better perspective to view the interesting topography and geology here created by various different ice ages over time.
Way above the tree line spread all through out the tundra are hundreds of boulder fields, short vegetation, lakes, and wildlife in fact that is almost all you see for miles and miles. I saw herds of caribou traveling around the area as well as muskox, wolves, fox, arctic hare, and various types of birds.
More Nunavut posts to come …