# Slope

#### class Slope extends FocalOp1[Double, Raster]

Calculates the slope of each cell in a raster.

Slope is the magnitude portion of the gradient vector. It is the maximum change of elevation from a raster cell to any immediate neighbor. It uses Horn's method for computing slope.

As with aspect, slope is calculated from estimates of the partial derivatives dz/dx and dz/dy.

Slope is computed in degrees from horizontal.

The expression for slope is:

`val slope = atan(sqrt(pow(`dz/dy`,2) * pow(`dz/dx`,2)))`

Geospatial Analysis - A comprehensive guide (Smit, Longley, and Goodchild)

SurfacePoint for slope calculation logic.

Linear Supertypes
FocalOp1[Double, Raster], FocalOperation1[Double, Raster], FocalOperation[Raster], Operation[Raster], Serializable, Serializable, Product, Equals, AnyRef, Any
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Inherited
1. Slope
2. FocalOp1
3. FocalOperation1
4. FocalOperation
5. Operation
6. Serializable
7. Serializable
8. Product
9. Equals
10. AnyRef
11. Any
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### Instance Constructors

1. #### new Slope(r: Op[Raster], ns: Op[TileNeighbors], zFactor: Op[Double])

zFactor

Number of map units to one elevation unit. The z factor is the multiplicative factor to convert elevation units

### Type Members

1. #### type Args = List[Any]

Definition Classes
Operation
2. #### type Steps = PartialFunction[Any, StepOutput[Raster]]

Definition Classes
Operation

### Value Members

1. #### final def !=(arg0: AnyRef): Boolean

Definition Classes
AnyRef
2. #### final def !=(arg0: Any): Boolean

Definition Classes
Any
3. #### final def ##(): Int

Definition Classes
AnyRef → Any
4. #### final def ==(arg0: AnyRef): Boolean

Definition Classes
AnyRef
5. #### final def ==(arg0: Any): Boolean

Definition Classes
Any
6. #### def _run(): StepOutput[Raster]

Definition Classes
FocalOperation1Operation
7. #### def andThen[U](f: (Raster) ⇒ Op[U]): Operation[U]

Definition Classes
Operation
8. #### final def asInstanceOf[T0]: T0

Definition Classes
Any
9. #### def canEqual(other: Any): Boolean

Definition Classes
FocalOperation1 → Equals
10. #### def clone(): AnyRef

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( ... )
11. #### val debug: Boolean

Definition Classes
Operation
12. #### final def eq(arg0: AnyRef): Boolean

Definition Classes
AnyRef
13. #### def equals(arg0: Any): Boolean

Definition Classes
AnyRef → Any
14. #### def filter(f: (Raster) ⇒ Boolean): Operation[Raster]

Definition Classes
Operation
15. #### def finalize(): Unit

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( classOf[java.lang.Throwable] )
16. #### def flatMap[U](f: (Raster) ⇒ Operation[U]): Operation[U]

Create a new operation with a function that takes the result of this operation and returns a new operation.

Create a new operation with a function that takes the result of this operation and returns a new operation.

Definition Classes
Operation
17. #### def flatten[B](implicit f: (Raster) ⇒ Op[B]): Operation[B]

Definition Classes
Operation
18. #### def foreach[U](f: (Raster) ⇒ U): Unit

Create an operation that applies the function f to the result of this operation, but returns nothing.

Create an operation that applies the function f to the result of this operation, but returns nothing.

Definition Classes
Operation
19. #### def getCalculation(r: Raster, n: Neighborhood): FocalCalculation[Raster] with Initialization1[Double]

Gets a calculation to be used with this focal operation for the given raster neighborhood.

Gets a calculation to be used with this focal operation for the given raster neighborhood.

Choosing the calculation based on on the raster and neighborhood allows flexibility in what calculation to use; if some calculations are faster for some neighborhoods (e.g., using a CellwiseCalculation for Square neighborhoods and a CursorCalculation for all other neighborhoods), or if you want to change the calculation based on the raster's data type, you can do so by returning the correct FocalCalculation from this function.

r

Raster that the focal calculation will run against.

n

Neighborhood that will be used in the focal operation.

Definition Classes
FocalOp1FocalOperation1
20. #### final def getClass(): Class[_]

Definition Classes
AnyRef → Any
21. #### def hashCode(): Int

Definition Classes
AnyRef → Any
22. #### def into[U](f: (Operation[Raster]) ⇒ U): U

Call the given function with this operation as its argument.

Call the given function with this operation as its argument.

This is primarily useful for code readability.

Definition Classes
Operation

http://debasishg.blogspot.com/2009/09/thrush-combinator-in-scala.html

23. #### final def isInstanceOf[T0]: Boolean

Definition Classes
Any
24. #### def map[U](f: (Raster) ⇒ U): Operation[U]

Create a new operation that returns the result of the provided function that takes this operation's result as its argument.

Create a new operation that returns the result of the provided function that takes this operation's result as its argument.

Definition Classes
Operation
25. #### final def ne(arg0: AnyRef): Boolean

Definition Classes
AnyRef
26. #### val nextSteps: PartialFunction[Any, StepOutput[Raster]]

Definition Classes
FocalOperation1Operation
27. #### final def notify(): Unit

Definition Classes
AnyRef
28. #### final def notifyAll(): Unit

Definition Classes
AnyRef
29. #### def opId: String

Definition Classes
Operation
30. #### def prettyString: String

Definition Classes
Operation
31. #### def processNextSteps(args: Args): StepOutput[Raster]

Definition Classes
Operation
32. #### def productArity: Int

Definition Classes
FocalOperation1 → Product
33. #### def productElement(index: Int): Any

Definition Classes
FocalOperation1 → Product
34. #### def productIterator: Iterator[Any]

Definition Classes
Product
35. #### def productPrefix: String

Definition Classes
Product
36. #### var rasterOp: Op[Raster]

Definition Classes
FocalOperation1
37. #### def run(): StepOutput[Raster]

Execute this operation and return the result.

Execute this operation and return the result.

Definition Classes
Operation
38. #### def runAsync(args: Args): StepOutput[Raster]

Definition Classes
Operation
39. #### final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes
AnyRef
40. #### def toString(): String

Definition Classes
AnyRef → Any
41. #### final def wait(): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
42. #### final def wait(arg0: Long, arg1: Int): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
43. #### final def wait(arg0: Long): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
44. #### def withFilter(f: (Raster) ⇒ Boolean): Operation[Raster]

Definition Classes
Operation
45. #### def withName(n: String): Operation[Raster]

Definition Classes
Operation
46. #### def withResult[U](f: (Raster) ⇒ Operation[U]): Operation[U]

Create a new operation with a function that takes the result of this operation and returns a new operation.

Create a new operation with a function that takes the result of this operation and returns a new operation.

Same as flatMap.

Definition Classes
Operation