How MoRPh5s are Calculated

When you enter five MoRPh surveys in close proximity to one another, Cartographer automatically generates a marker on the MoRPh5 map. It uses the following rules to work out whether surveys should be grouped together:

  • the surveys must be recorded within 2 weeks of one another;
  • the surveys must be recorded within 5km of one another;
  • the surveys must have the same river name, reach name, and subreach name.

How River Condition is Calculated

When you enter five MoRPh surveys and a matching River Type survey, Cartographer automatically generates a marker on the River Condition map containing outputs for Biodiversity Metric 2.0. It uses data from the MoRPh5 map, which is grouped with data from the River Type map using the following rules:

  1. the surveys must have been recorded within approximately 180 days of each other;
  2. the surveys must have been recorded within approximately 50km of each other;
  3. one of the following must hold:
    • the surveys must have the same river and reach name fields;
    • the surveys must have the same project code fields.

Rules 1 and 2 are there to cast a wide net that compares surveys in the right time frame and geographical region. Rule 3a prevents accidental corellation between different branches and reaches, while Rule 3b gives you some ability to override this behaviour in multi-reach projects