====== Create Elevation Graph ======

===== Description =====

This functor creates the elevation patch graph from neighborhood information and patch properties.

===== Inputs =====

^ Name  ^ Type  ^ Description  ^
| Neighborhood Table  | [[Neighborhood Table Type]]  | Defines spatial connectivity between elevation patches. Elevation patches are represented by their corresponding ids.  |
| Properties  | [[Table Type]]  | Table of elevation patch properties, in the format "Patch_Id*:real, Patch_Elevation:real, Patch_Area:real, Patch_Slope:real, Patch_Y:real, Patch_X:real". Patch_Y and Patch_X typically hold the coordinates of each patch's centroid. Neighboring patches, per Neighborhood Table, must have different elevation values in Properties, or this functor reports an error.  |

===== Optional Inputs =====

None.

===== Outputs =====

^ Name  ^ Type  ^ Description  ^
| Elevation Graph  | [[Elevation Graph Type]]  | Elevation patch graph created from the neighborhood relationships and their properties.  |

===== Group =====

[[Functor List#Elevation Graph | Elevation Graph]]

===== Notes =====

The elevation patch graph is a directed graph whose nodes correspond to the patches defined in Neighborhood Table, typically built from a terrain map. Its edges represent the adjacency and elevation-difference relationships between each patch and its neighbors: a node's parent nodes are its higher-elevation neighbors, and its child nodes are its lower-elevation neighbors. Neighboring patches must have different elevation values according to Properties, or this functor reports an error.

===== Internal Name =====

CreateElevationGraph