## tools.CathSlopeLengthProcess


The Catchment Slope Length Process tool from MIKE+.


Usage

``` python
tools.CathSlopeLengthProcess(database)
```


## Examples

An example to calculate the slope and length for catchment of "imp3" based on a slope shapefile and dfs2 file.

``` python
>>> from mikeplus import Database
>>> db = Database("path/to/model.sqlite")
>>> catch_ids = ["imp3"]
>>> tool = CathSlopeLengthProcess(db)
>>> tool.run(catch_ids, "../tests/testdata/catchSlopeLen/Catch_Slope.shp", "tests/testdata/catchSlopeLen/dem.dfs2", 0)
>>> db.close()
```


## Methods

| Name | Description |
|----|----|
| [__init__()](#__init__) | Initialize the CathSlopeLengthProcess with the given Database. |
| [run()](#run) | Calculate the slope and length for each catchment. |

------------------------------------------------------------------------


#### \_\_init\_\_()


Initialize the CathSlopeLengthProcess with the given Database.


Usage

``` python
__init__(database)
```


##### Parameters


`database: Database`  
A Database object for the MIKE+ model.


------------------------------------------------------------------------


#### run()


Calculate the slope and length for each catchment.


Usage

``` python
run(
    catch_ids,
    line_layer,
    dem_layer,
    direction,
    min_slope=0.002,
    demUnitKey=1000,
    overwrite_exist=True
)
```


##### Parameters


`catch_ids: Iterable[str]`  
MUIDs of the catchments

`line_layer: string`  
a slope shape file path

`dem_layer: string`  
dem file path, can be dfs2 file path

`direction: int`  
Downstream = 0, Upstream = 1

`min_slope: float = ``0.002`  
unit is one per one, by default 0.002

`demUnitKey: int = ``1000`  
int type data, please check MIKE unit key, by default 1000

`overwrite_exist: bool = ``True`  
overwrite exist value or not, by default True