Use Case: Relation Layer

Summary

Precondition: The user has opened the app and has selected the relations layer.
Main success scenario:
- Relations are individual elements or connect two elements, that are removed or added when adding, moving, removing, deleting or modifying elements on the map:
  - Crop rotation
  - another plant is at the same spot in future (+-)
  - nearby companion or antagonist (+-)
  - temporal beneficial or destructive relation (+-)
  - shade mismatch (-)
  - hydrology mismatch (-)
  - plant is on unsuitable or beneficial zone (+-)
- The user successfully adds, edits, moves and hides relations.
Alternative scenario: The user accidentally adds, edits, moves or hides the wrong relations and uses the app's undo function to correct the mistake.
Error scenario:
Postcondition: The user's map shows the relations as desired, or hides all of them if the layer has visibility off.
Non-functional Constraints:
- Performance: more than 10000 elements per year and per alternative should be usable without noticeable delays and acceptable memory overhead
Note:
- it gets dynamically generated based on alternatives
- while doing drag and drop of plants, relations are shown anyway.
Environmental Constraints:
- Hydrology Layer
- Fertilization Layer