Why is Albers equal area conic projection popular for maps of the United States?
The Albers projection is an equal area conic projection. It uses two standard parallels to reduce some of the distortion found in a projection with only one standard parallel. The projection is best suited for land masses extending in an east-to-west orientation at mid-latitudes.
What are the standard parallels for the North America Albers Equal Area Conic and the USA contiguous Albers Equal Area Conic?
Uses and applications Used for the conterminous United States, normally using 29°30′ and 45°30′ as the two standard parallels.
What is North America Albers Equal Area Conic?
The Albers Equal Area Conic uses two standard parallels, or secant lines. First developed by Heinrich Christian Albers in the early nineteenth century for European maps, its biggest success has been for maps of North America —specifically, for maps for the conterminous United States .
What is Albers Equal preservation?
The Albers projection is similar to the Lambert conformal conic projection, however, equal area (or equivalent) projections preserve the area (or the amount of space) within features. On a small-scale political map of the world, the areas within each country are preserved.
What is one difference between the Albers and Lambert projections for the contiguous United States?
10° and 70° North. If the standard parallels are set to the pole and another parallel, it becomes the Lambert Equal-Area Conic projection….Or:
| Albers | Lambert conformal conic | |
|---|---|---|
| recommended comparisons | — | — |
What is a gnomonic projection used for?
6 days ago
Usage. The gnomonic projection is appropriate for navigational maps at large scales, displaying less than one-sixth of the planet. It has been used for creating world globes using polyhedral mapping.
What are the latitudes for the standard parallels in the predefined Canada Albers equal area conic projection?
Albers projection of the world with standard parallels 20°N and 50°N.
What is Albers USA?
Albers USA projection style containing all 50 US states + Puerto Rico, and their counties. Representation of all states matters. Albers USA is typically the go-to projection for US Elections because it shows a non-distorted Alaska and Hawaii in close proximity to the rest of the states.
What are the advantages and disadvantages of gnomonic projection?
Advantages- The latitude and longitude appear as a grid which makes easy to locate positions with a ruler, it is very accurate at the equator. Disadvantages- Distances between regions and their areas are distorted at the poles. What is a gnomonic projection?
Is a gnomonic projection conic?
The gnomonic projection projects points from a globe onto a piece of paper that touches the globe at a single point. The conic projection is made by projecting points and lines from the globe onto a cone. These projections are used to map small areas. They are often used for road and weather maps.
What type of projection is Gnomonic?
in the plane, it can only be used to project one hemisphere at a time. In a gnomonic projection, great circles are mapped to straight lines. The gnomonic projection represents the image formed by a spherical lens, and is sometimes known as the rectilinear projection.
When was the Albers Equal Area Conic Projection created?
The Albers Equal Area Conic map projection was developed by Heinrich Christian Albers in 1805. This projection uses two standard parallels. No distortion occurs along the two standard parallels, and parallels gradually decrease in spacing away from the central parallel.
How is the Albers projection used in the HEC?
HEC uses an Albers projection for the definition of the Standard Hydrologic Grid. The equal area property of this projection means that areas in the map are proportional to the corresponding areas on the earth’s surface. Directions and shapes distort increasingly away from the central meridian and outside the two standard parallels.
Which is the best range for an Albers conic?
Best results for regions predominantly east–west in orientation and located in the middle latitudes. Total range in latitude from north to south should not exceed 30–35°. No limitations on the east–west range. Used for small regions or countries but not for continents.
How are the parallels and the Poles represented in Albers?
Albers is a conic projection. All meridians are equally spaced straight lines converging to a common point. The parallels and both poles are represented as circular arcs centered on the point of convergence of the meridians. The spacing of the parallels decreases toward the poles.