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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Finished up my first survey in the North, will be headed back south tomorrow after a small 4 day trip. Would have been nice to have a few more days up here to get out and explore or do some fishing (but these smaller in and out jobs are nice to have once and a while).
I did get a few hours free to check out the City of Yellowknife (probably all we needed) and had lunch at the famous Wild Cat Cafe, witch was kind of neat. Saw a some strange things here and there too like a ford truck turned into a home made snow mobile.
The job here was for a small fixed wing aerial LIDAR survey of an area northeast of the city of Yellowknife, and just south of Gordon Lake. The terrain there was really rocky, due to the extreme rugged Canadian Shield and very sparse soil cover. I was some what surprised though by the amount of trees that were there, it wasn’t heavily forested by any means but trees were fairly abundant and we had to choose our landing places wisely.
Gordon Lake is one of the lakes that they use to create the famous winter Ice Road that allows goods and equipment to be shipped up north to the diamond mines for a few months every year. We actually fuelled at one of the base camps that builds and services the road so met a few neat people there with interesting stories to tell.
Gordon Lake had the most mosquitoes I have ever experienced by far. dark swarms of them clouding around us every where we went.We flew into the area to do our ground GPS control survey via a neat little MD500 helicopter and were quickly swarmed by the little buggers. They were not actually doing much biting due to the amount of bug dope we had by man it was hard to concentrate on work. After 3 or 4 hours of that we were happy to get back to town free of those little critters.
Here are some photos of our work out at Gordon Lake, NWT.
I Finally got my chance to explore some of the Canadian north, with the first stop being in Yellowknife, North West Territories. Yellowknife, is a neat little place, perhaps bigger then I expected and containing many more similarities to other small Canadian Towns and Cities probably due to the city being connected to the rest of the country via Highway. Any place that has a Walmart and a Tim Horton’s after all can not be all that remote.
One of Yellowknife’s best known historic landmarks and popular tourist attractions, is a little summer restaurant called the Wildcat Cafe. The building portion of the restaurant is a small old mining camp style wooden log structure that was originally built in 1937 and then later designated as a heritage building in 1992.
The WildCat Cafe is known as the city’s oldest restaurant and continues to operate every year in the original log structure, with extra seating setup out side. Food served at the Wildcat Cafe is mostly typical Canadian fast food (fries, burgers, ice cream etc.) but they also add a little northern touch combining a few dishes with a little Caribou and MuskOx as well.
Interesting enough, a replica of the Wildcat Cafe cabin has been built at the Canadian Museum of Civilization in Gatineau, Quebec, witch was neat to see after being to the real thing.