Where is the scale correct on a Transverse Mercator chart?
Where is the scale correct on a Transverse Mercator chart?
The scale is true on the central meridian. The projection is reasonably accurate near the equator. Scale at an angular distance of 5° (in latitude) away from the equator is less than 0.4% greater than scale at the equator, and is about 1.54% greater at an angular distance of 10°.
How do you calculate Mercator projection?
The formula for Mercator’s projection is T(ϕ, θ)=(θ, ln(|sec(ϕ) + tan(ϕ)|)). Of course, there are a huge number of map projections. Two more cylindrical projections are shown in figure 2.
What is projection scale factor?
Scale factor is a unitless value applied to the center point or line of a map projection. The scale factor is usually slightly less than one. The Universal Transverse Mercator (UTM) coordinate system, which uses the Transverse Mercator projection, has a scale factor of 0.9996.
What type of projection is Transverse Mercator?
conformal map projection
Transverse Mercator is a conformal map projection. It generally does not maintain true directions, but angles and shapes are maintained at infinitesimal scale. Distances are accurate along the central meridian if the scale factor is 1.0.
What is Mercator projection used for?
Description. Mercator is a conformal cylindrical map projection that was originally created to display accurate compass bearings for sea travel. An additional feature of this projection is that all local shapes are accurate and correctly defined at infinitesimal scale. It was presented by Gerardus Mercator in 1569.
What is UTM projection good for?
This allows distances and angles to be computed easily, and minimizes distortion. While the military popularized the UTM projection for ground operations, it is also ideal for many GIS operations. The Mercator projection is conformal and preserves angles, but distortion increases away from the equator.
How do you draw a Mercator projection step by step?
All parallels and meridians are straight lines and they intersect each other at right angles. 2. All parallels have the same length which is equal to the length of equator. 3.
Which of the following is a characteristic of the Mercator projection?
Which of the following is a characteristic of the Mercator projection? The size and shape of countries in the higher latitudes are greatly exaggerated.
What are the standard parallels?
Standard Parallels are lines at which there is no distortion in the map projection. Standard parallels are used in both conical and cylindrical projections. They theoretically touch the earth’s surface. Standard parallels are parallel lines that are drawn on a reference globe that will maintain a scale factor of 1.0.
Why is Mercator projection distortion?
Because the linear scale of a Mercator map increases with latitude, it distorts the size of geographical objects far from the equator and conveys a distorted perception of the overall geometry of the planet.
What do Mercator projections show accurately?
It became the standard map projection for navigation because it is unique in representing north as up and south as down everywhere while preserving local directions and shapes. As a side effect, the Mercator projection inflates the size of objects away from the equator.
What is transtransverse Mercator projection?
Transverse Mercator is a transverse cylindric projection. The central meridian and antimeridian lines are presented as one vertical line in the middle of the projection. Northern parts of meridians 90° away from the central meridian project as a horizontal straight line through the North Pole, extending to infinity when approaching the equator.
What are the parameters of transverse Mercator Nga 2014?
Transverse Mercator NGA 2014 parameters are as follows: The Universal Transverse Mercator (UTM) coordinate system is a specialized application of the transverse Mercator projection. The world is divided into 60 north and south zones, each six degrees wide. Each zone has its own central meridian and a scale factor of 0.9996.
What is the Universal Transverse Mercator coordinate system?
The Universal Transverse Mercator (UTM) coordinate system is a specialized application of the transverse Mercator projection. The world is divided into 60 north and south zones, each six degrees wide. Each zone has its own central meridian and a scale factor of 0.9996. Zones 1N and 1S start at 180° west.
What is the distortion of the Mercator projection?
Distortion values are symmetric across the equator and the central meridian. The transverse Mercator projection is appropriate for mapping large-scale or smaller areas with predominantly north-south trending extents. It is a very commonly used projection. Various countries use it for their topographic maps and large-scale coordinate systems.