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calculate_categorical_map [2026/07/07 16:07]
hermann 		calculate_categorical_map [2026/08/28 03:11] (current)
hermann Sync from local documentation review
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 ===== Description ===== ===== Description =====
  
-Computes a new **categorical raster map** by evaluating an algebraic or logical expression independently for every cell in the output map. Functionally identical to [[Calculate Map]] — the same inputs, parameters, and expression language apply — but the output is typed as a categorical map, which preserves ​category semantics for downstream functors that distinguish categorical maps from continuous ​maps (e.g. [[Calc Areas]], [[For Each Category]]).+Computes a new categorical raster map by evaluating an algebraic or logical expression independently for every cell of the output map. Functionally identical to [[Calculate Map]] — the same inputs, parameters, and expression language apply — except that its output is typed as a categorical map, preserving ​category semantics for downstream functors that distinguish categorical maps from continuous ​ones (e.g. [[Calc Areas]], [[For Each Category]]). Use this functor when the expression produces integer class codes; use [[Calculate Map]] instead for continuous or measured values.
  
-Use this functor when the expression produces integer class codes rather than measured or continuous values. If the expression produces continuous or measured values, use [[Calculate Map]] instead. +This is one of Dinamica EGO's five calculator functors. Its abbreviated (shorthand) ​syntax ​is ''##''​. See [[ego_script#​calculator_functor_shorthand|Calculator functor shorthand]] in the EGO Script documentation for the verbose and abbreviated forms, and [[Calculate Functors — Complete Operator Documentation]] for the full expression language reference.
- +
-The **abbreviated ​syntax** ​(also called **shorthand**) for this functor ​is ''##''​. See [[ego_script#​calculator_functor_shorthand|Calculator functor shorthand]] in the EGO Script documentation for the full syntax of both the verbose and abbreviated forms, and [[calculate_functors|Calculate Functors — Complete Operator Documentation]] for the complete ​expression language reference.+
  
 ===== Inputs ===== ===== Inputs =====
  
-^ Name ^ Type ^ Description ^ +^ Name  ^ Type  ^ Description ​ ^ 
-| Expression | [[Image Expression Type]] | The algebraic ​or logical formula used to compute each output cell's category code. Must be enclosed in square brackets ''​[ ]''​ in EGO Script. |+| Expression ​ | [[Image Expression Type]] ​ | Algebraic ​or logical formula used to compute each output cell's category code. Must be enclosed in square brackets ''​[ ]''​ in EGO Script. ​ |
  
 ===== Optional Inputs ===== ===== Optional Inputs =====
  
-^ Name ^ Type ^ Default ​^ Description ^ +^ Name  ^ Type  ^ Description ​ ^ Default Value  ​^ 
-| Cell Type | [[Cell Type Type]] ​| Signed 32-bit Integer ​| Data type for each output cell. | +| Cell Type  | [[Cell Type Type]] ​ | Data type for each output cell.  | Signed 32 Bit Integer  ​| 
-| Null Value | [[Null Value Type]] ​| Based on Cell Type | Sentinel value representing "no data" in the output. | +| Null Value  | [[Null Value Type]] ​ | Sentinel value representing "no data" in the output. ​ | .default  ​| 
-| Result Is Sparse | [[Boolean Value Type]] ​| False | If true, only non-null cells are stored ​in memory ​— saves memory but slows random access. | +| Result Is Sparse ​ | [[Boolean Value Type]] ​ | If true, only non-null cells are stored, saving ​memory ​at the expense of random-access ​speed. This is an advanced port.  | No  ​| 
-| Result Format | [[Map Type]] | None | Optional reference ​map whose spatial format (extent, resolution, projection) is applied to the output. Category ​information in the reference map is ignored. |+| Result Format ​ | [[Map Type]] ​ | Reference ​map whose spatial format (extent, resolution, projection) is applied to the output; its category ​information, if any, is ignored. Prefer this port over a Number Map hook when a map is needed only for format purposes, since a hook defines an identifier ​in the expression namespace and blocks abbreviated syntax if that identifier goes unused in the expression. This is an advanced port.  | .none  ​|
  
 ===== Outputs ===== ===== Outputs =====
  
-^ Name ^ Type ^ Description ^ +^ Name  ^ Type  ^ Description ​ ^ 
-| Result | [[Categorical Map Type]] | The computed ​categorical output map. |+| Result ​ | [[Categorical Map Type]] ​ | Computed ​categorical output map. Its dimensions come from the connected input maps, or from Result Format when given.  ​|
  
 ===== Group ===== ===== Group =====
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 ===== Notes ===== ===== Notes =====
  
-All behaviour ​— hook functor wiring, ​spatial context, ​image virtualization, available expression features, null value handling, and performance ​— is identical to [[Calculate Map]]. See the [[Calculate ​Map#​notes|Notes]] section of that page for full details.+All behavior ​— hook functor wiring, ​shared-cell evaluation and image virtualization ​across connected maps, null propagation, and the requirement that at least one map or Result Format be provided ​— is identical to [[Calculate Map]]. See that functor'​s Notes for full details. 
 + 
 +See [[Calculate ​Functors — Complete Operator Documentation]] for the complete expression language, null-value handling rules, and worked examples.
  
 ===== Internal Name ===== ===== Internal Name =====
  
-''​CalculateCategoricalMap''​+CalculateCategoricalMap