pit

pit

Unique value for each pit cell

Result = pit(ldd)

ldd

spatial ldd

Result

spatial nominal

Operation

A pit is a cell whose neighbours all have a local drain direction in direction of the pit cell. A pit cell doesn’t have a local drain direction because all its neighbours are at a higher elevation. Additionally the outflow cell of each catchment on the map, which is a cell at the edge of the map is also a pit. On a local drain direction network pits have a cell value 5.

For every pit cell on the local drain direction network ldd an unique number starting with 1 is assigned to the corresponding cell on Result; these are cells with a value 5 on ldd. The other cells on ldd do have a local drain direction and are assigned a 0 value on Result.

Notes

A missing value on ldd is assigned a missing value on Result.

Group

This operation belongs to the group of Neighbourhood operators; local drain directions

See Also

lddmask

Examples

1. • pcrcalc

   binding

   Result = Result.map;

   Ldd = Ldd.map;

   initial

   report Result = pit(Ldd);

   
   

   • python

   Ldd = readmap(“Ldd.map”)

   Result = pit(Ldd)

   Result.map	Ldd.map