Esri ArcGIS Pro Foundation Certification Practice Test

Why is the use of an earth-centered datum important?

1. It ensures all coordinates are linear

2. It allows for precise global positioning

3. It simplifies the mapping of local areas

4. It preserves the shape of the Earth

The correct answer is: It allows for precise global positioning

The use of an earth-centered datum is important because it allows for precise global positioning. An earth-centered datum is designed to accurately represent the Earth's shape and size, meaning that the coordinates assigned to geographic locations can be reliably used for navigation, surveying, and various Earth science applications. This precision is crucial for global applications, such as GPS, where slight inaccuracies can lead to significant errors in positioning. An earth-centered datum accounts for the Earth's irregular shape and gravitational variations, allowing for coordinate systems that facilitate interoperability and accuracy when integrating data across different regions of the world. This is essential for activities like international mapping, satellite navigation, and data analysis that require consistent and precise measurements. The other options focus on aspects that may be important but do not capture the primary purpose of an earth-centered datum as effectively as the aspect of global positioning does. By prioritizing precision in global locations, the use of such a datum directly enhances the capability for accurate mapping and positioning at a global scale.