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Our thoughts on the latest news and trends in GNSS.

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Types of Coordinate Systems

March 29th, 2019|

Types of Coordinate Systems Thought there was only one type of coordinate system? Think again. There are many different kinds that are used for different purposes. This post will be covering the two kinds that are most useful for surveying: projected and geographic. (If you don’t know what a coordinate system is, click here.) Projected coordinate systems are grids of straight lines that are used to find positions on two-dimensional maps

LiDAR Technology

February 11th, 2019|

Most LiDAR systems use four main components: Lasers Lasers are categorized by their wavelength. 600-1000nm lasers are more commonly used for non-scientific purposes but, as they can be focused and easily absorbed by the eye, the maximum power has to be limited to make them 'eye-safe'. Lasers with a wavelength of 1550nm are a common alternative as they are not focused by the eye and are 'eye-safe' at much higher power levels. These wavelengths are used for

LiDAR reveals hidden rivers

January 25th, 2019|

LiDAR is an amazing tool that can reveal hidden features on the earth's surface.  In Washington State, geologists used LiDAR to create stunning surface models that vividly depict landslides, faults, floods, glaciers and erosion scars.   Scientists and engineers, such as fluvial geomorphologists, can use LiDAR to study ancient topographic features.  In the image on the right, an air photo shows only the active, treeless channels of the Sauk River.  In contrast, in the image on the left, a LiDAR

L1, L2, and L5 GPS Signals: What Do They Mean?

January 16th, 2019|

L1, L2, and L5 GPS Signals: What Do They Mean? Have you ever been confused by how many different types of GPS signals there are? If so, here is your quick-and-easy summary explaining L1, L2, and L5 signals and how they are used. L1 The L1 signal is the oldest GPS signal. It has two parts: the Coarse/Acquisition Code (C/A) and the Precision Code (P-code). The P-code is reserved for

What is Orthoimagery?

January 15th, 2019|

What is Orthoimagery? Orthoimagery is an accurate representation of the Earth’s surface (source). When images are taken from aerial or satellite positions, distortion occurs (source). This means that the image taken is not an accurate representation of the space. This can be corrected through a process called orthorectification. After correction, distances can be accurate to the nearest four centimetres (source).  What are some common uses of Orthoimagery? Orthoimagery is used in geographic information systems

What Is A Benchmark?

January 4th, 2019|

What Is A Benchmark? If you have ever used a map, chances are that map was made with the help of benchmarks. Also known as survey markers or survey monuments, benchmarks are objects used to mark key points on the Earth’s surface. Throughout history they have been used for navigation, to indicate land borders, and for mapmaking across the globe. History Historically, anything from rock towers and

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