Which would be the best projection for the United States?
The Albers equal area conic is the typical projection for historical USGS maps of the lower 48, it being a general-purpose low-distortion compromise for mid-latitude short and wide extents.
What map projection does USGS use?
Transverse Mercator projection
A large-scale (1:24,000) 7.5-minute USGS topographic map based on the Transverse Mercator projection is nearly correct in every respect. The USGS Map Projections poster summarizes and compares eighteen common map projections and their uses.
Which is the best projection for the United States?
Albers Equal Area Conic (Heinrich Albers, 1805): Like Lambert Conformal Conic, this is a very popular map projection for the US, Canada and other continental/large countries with a primarily E-W extent. Used by the USGS for maps showing the conterminous United States (48 states) or large areas of the United States.
What should I consider when choosing a projection?
When you choose a projection, the first thing to consider is the purpose of your map. For general reference and atlas maps, you usually want to balance shape and area distortion. If your map has a specific purpose, you may need to preserve a certain spatial property—most commonly shape or area—to achieve that purpose.
Which is projection system is best for mapping?
ESRI has defined three projections especially for the contiguos United states. These are included in QGIS as well: So it is up to you which projection characteristics you need: equal area, equal distance or conformal.
When do you use a conformal projection on a topographic map?
You should use a conformal projection when the map’s main purpose involves measuring angles, showing accurate local directions, or representing the shapes of features or contour lines. This category includes: · Topographic maps and cadastral (land parcel) maps