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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Within the Hocking Hills State Park are several spectacular features based around rock formations, including Old Man’s Cave (a narrow, deep gorge, with many waterfalls), Cantwell Cliffs (a broad gorge at the head of a hollow with a unique stone stairway) and Ash Cave / Cedar Falls (large rock caves with water falls.
TITAN Cross Country Road Trip # 4
Start Location: Ottawa, Ontario
End Location: Houston, Texas
States / Provinces Crossed:
– 8 states: New York, Pennsylvania, Ohio, Kentucky, Tennessee, Arkansas, and Texas
– 1 province: Ontario
Places stayed or visited: Syracuse NY, Cleveland OH, Logan OH, Lexington KY, Louisville KY, Little Rock AK, Houston TX
Approximate Distance: 3160 km
Duration: 7 days
Although this may have been my shortest road trip since I started traveling with the Terrapoint Titan mobile LIDAR system we still crossed through eight states and 1 province along about a 3160+ kilometer journey in seven days (with only 1 speeding ticket! … and no it wasn’t mine either…). Unlike most of the previous road trips, there was only one official stop along the way. It was just outside Hocking Hills State Park in Logan, Ohio but the main focus was to bring the system to our Houston office for future jobs in that region.
Besides the short hike at the Hocking Hills State Park, this trip didn’t allow any time to partake in many interesting stops (I was hoping to get to stop in Lynchburg, Tennessee to take a Jack Daniel’s Distillery Tour or visit the Clinton Presidential Library while stopping in Little Rock but that didn’t work out) so this time I have little things to mention besides the numerous typical truck stops for gas and coffee refills. It was mostly interstate driving with a short country side detour through Ohio and Kentucky (from Logan OH to Lexington KY).
Maybe on the next trip will be a little more exciting …