How do I change the projection in ArcGIS desktop?

Q: How do I define or change map projection in ArcGIS?

1. Open ArcToolbox and select Data Management Tools > Projections and Transformations > Define Projection.
2. Choose the appropriate coordinate system.
3. Once the projection is defined correctly, the projection can be changed.

What type of projection is Mollweide?

pseudocylindrical map projection
The Mollweide projection is an equal-area pseudocylindrical map projection displaying the world in a form of an ellipse with axes in a 2:1 ratio. It is also known as Babinet, elliptical, homolographic, or homalographic projection.

What is the Mollweide projection good for?

Mollweide projection is commonly used in small-scale mapping and thematic maps to illustrate accurate area characteristics. Thus, it is used mainly on maps that require accurate areas as opposed to those requiring accurate shapes and angles. It can also be used to show distributions of global data.

How do I create a projection in ArcGIS?

Procedure

1. Start ArcMap with a new, empty map, and add the data that was created in the custom projected coordinate system.
2. Navigate to View > Data Frame Properties > Coordinate System tab, and click New > Projected Coordinate System.
3. In the top box on the New Projected Coordinate System dialog box, name the new system.

How do you choose a map 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.

How do you change the projected coordinate system of a shapefile in Arcgis?

1. In ArcCatalog, click the shapefile whose coordinate system you want to define.
2. Click the File menu and click Properties.
3. Click the XY Coordinate System tab.
4. Click Modify.
5. Follow the steps for defining either a new geographic or a new projected coordinate system to change the appropriate parameters.
6. Click OK.

Is Mollweide projection conformal?

It is free of distortion only at the two points where the 40º44′ parallels intersect the central meridian. This projection is not conformal or equidistant.

What is the difference between projecting a map and projecting data?

If your data doesn’t have a coordinate system, or you suspect it has the wrong one, you want Define Projection. If your data already has a coordinate system but you wish to convert it into a different one, you want Project.

Where is the project tool in ArcGIS?

Expand Data Management Tools > Projections and Transformations > Feature. Double-click Project to project a single shapefile or geodatabase feature class, or right-click Project and select the Batch mode to project multiple shapefiles or geodatabase feature classes (9.2 or higher).

Which projection is best?

AuthaGraph. This is hands-down the most accurate map projection in existence. In fact, AuthaGraph World Map is so proportionally perfect, it magically folds it into a three-dimensional globe. Japanese architect Hajime Narukawa invented this projection in 1999 by equally dividing a spherical surface into 96 triangles.