An elevation is different. It shows the face of something, or perhaps more correct, the projection of an object/s to a plane. But my testing suggests it produces SECTIONS, not elevations.
Yes, you can use abbreviations in tables and figures. All abbreviations used in tables and figures should be defined in the table note or figure caption, respectively, even though the abbreviations will be also be defined in the text if they are used there.
The abbreviations e.g. (from the Latin exempli gratia) and i.e. (from the Latin id est) are often confused. This is because they are both used to introduce some clarification of something previously mentioned. The abbreviation e.g. is used to provide an example: