When to use transformations in a coordinate system?
After defining the coordinate system that matches your data, you may still want to use data in a different coordinate system. This is when transformations are useful. Transformations convert data between different geographic coordinate systems or between different vertical coordinate systems.
When do you use transformations to convert data?
This is when transformations are useful. Transformations convert data between different geographic coordinate systems or between different vertical coordinate systems. Unless your data lines up, you’ll encounter difficulties and inaccuracies in any analysis and mapping you perform on the mismatched data.
Is it best to use transformations in real time?
Relying on transformations to project layers in real time is helpful when you are exploring data because everything aligns. However, applying a transformation comes with costs in drawing performance and accuracy. It is a best practice to work with data in the same coordinate system when performing edits or analysis on your data.
Why do we need transformations in ArcGIS Pro?
This is necessary because the earth is actually a lumpy and slightly squashed sphere. The transformation is a calculation to convert the geographic coordinate system of the layers to match the geographic coordinate system of the map as the map draws so that everything is aligned. The data is not changed by a transformation.
When do you need to set a geographic transformation?
If you are using datasets that are based on different geographic coordinate systems, you will need to set a geographic, or datum, transformation. The terms geographic coordinate system and datum are often used interchangeably.
How to find a change in a coordinate system?
Consider a fixed point and show its “unit vectors” in each system. Note the positive directions of both (x,y,z) and (r,theta,phi) axes.