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--- extract_categorical_map_attributes [2014/04/11 20:52]
admin created
+++ extract_categorical_map_attributes [2026/08/28 03:17] (current)
hermann Sync from local documentation review
@@ Line 1: / Line 1: @@
-====== Extract Categorical Map Attributes =====
+====== Extract Categorical Map Attributes ======
 ===== Description =====
-This functor extracts the attributes and calculates basic statistics from a map and as a result creates a table that contains the extracted attributes.
+Calculates basic statistics from a map for each class delimited by a categorical map, returning them as a table indexed jointly by attribute and class. All layers of the map are analyzed together, and the resulting table refers to them jointly.
 ===== Inputs =====
-^ Name ^ Type ^ Description ^
+^ Name  ^ Type  ^ Description  ^
-| Map  | [[Map Type|Map]]  | Map whose attributes will be extracted.  |
+| Map  | [[Map Type]]  | Map whose attributes will be extracted.  |
-| Categorical Map  | [[Categorical Map Type|Categorical Map]]  | Map whose classes will be used to break the input map into subregions.  |
+| Categorical Map  | [[Categorical Map Type]]  | Map of classes used to delimit the calculation area for each class in Map.  |
 ===== Optional Inputs =====
-^ Name ^ Type ^ Description ^ Default Value ^
+^ Name  ^ Type  ^ Description  ^ Default Value  ^
-| Extract Dynamic Attributes  | [[Bool Type|Bool ]]  | If true, the [[Extract Map Attributes#Dynamic attributes|dynamic attributes]] will be calculated. | True  |
+| Extract Statistical Attributes  | [[Boolean Value Type]]  | If true, statistical attributes (mean, variance, standard deviation, mode, median, unique count) are also extracted.  | Yes  |
-| Extract Statistical Attributes  | [[Bool Type|Bool ]]  | If true, [[Extract Map Attributes#Statistical attributes|statistical attributes]] will be calculated. | False  |
 ===== Outputs =====
-^ Name ^ Type ^ Description ^
+^ Name  ^ Type  ^ Description  ^
-| Attributes | [[Lookup Table Type|Lookup Table]]  | Table containing the attributes extracted from a map. |
+| Attributes  | [[Table Type]]  | Table of extracted attributes, keyed by attribute and by class.  |
-| Layer Attributes | [[Table Type|Table]]  | Table containing the layer attributes. |
 ===== Group =====
@@ Line 30: / Line 27: @@
 ===== Notes =====
-This functor analyzes all map layers. The resulting table refers to all of them.
+Attributes has columns "Attribute" (key, the attribute's numeric code) and "Category" (key, the class value from Categorical Map), with the corresponding statistic in the "Value" data column.
-The functor employs a lookup table with keys to the attributes. Each key has a predefined name. This name can be used to retrieve the corresponding attribute in [[Calculate Map]], [[Calculate Categorical Map]], [[Calculate Value]] and [[Calculate Lookup Table]].
+Each attribute has a predefined name that can be used to retrieve it by name (rather than by numeric key) in [[Calculate Map]], [[Calculate Categorical Map]], [[Calculate Value]], and the lookup table calculators.
-If it is not possible to determine any of these attributes, the corresponding entry in the lookup table is left blank. It determines the maximum and the minimum values only when there is at least one non null cell on the map.
+If an attribute cannot be determined for a class, its entry is omitted from Attributes rather than being filled with a placeholder. Minimum and maximum values are only determined when the class has at least one non-null cell.
-==== Basic Attributes ====
+Dynamic attributes, computed across all non-null cells of all layers within each class:
-^ Key  ^ Predefined Name  ^ Description  ^
-| 1  | "lines"  | number of lines  |
-| 2  | "columns"  | number of columns  |
-| 3  | "cells"  | number of cells (number of lines multiplied by the number of columns)  |
-| 4  | "layers"  | number of layers  |
-| 5  | "cellHeight"  | cell height (in meters)  |
-| 6  | "cellWidth"  | cell width (in meters)  |
-| 7  | "cellArea"  | cell area (in hectares)  |
-| 19  | "cellType"  | [[Extract Map Attributes#Cell Type Codes|cell type code]]  |
-| 20  | "nullValue"  | null value  |
-==== Dynamic attributes ====
 ^ Key  ^ Predefined Name  ^ Description  ^
 | 8  | "nullCells"  | number of null cells  |
-| 9  | "nonNullCells"  | number of non null cells  |
+| 9  | "nonNullCells"  | number of non-null cells  |
 | 10  | "minCell"  | minimum value (excluding null cells)  |
 | 11  | "maxCell"  | maximum value (excluding null cells)  |
 | 12  | "cellSum"  | sum of the values (excluding null cells)  |
-==== Statistical attributes ====
+Statistical attributes (present only when Extract Statistical Attributes is true), computed across all non-null cells of all layers within each class:
 ^ Key  ^ Predefined Name  ^ Description  ^
@@ Line 68: / Line 52: @@
 | 18  | "uniqueCells"  | total unique occurrences (excluding null cells)  |
-==== Cell Type Codes ====
-The codes used to represent all the possible [[cell_type_type|cells types]], corresponding to attribute key 19 ("cellType"), are listed below. It is possible to convert the corresponding code back into a [[Cell Type Type|Cell Type]].
-^ Key  ^ Cell Type  ^
-| 0  | Unsigned 1 Bit Integer  |
-| 1  | Signed 8 Bit Integer  |
-| 2  | Unsigned 8 Bit Integer  |
-| 3  | Signed 16 Bit Integer  |
-| 4  | Unsigned 16 Bit Integer  |
-| 5  | Signed 32 Bit Integer  |
-| 6  | Unsigned 32 Bit Integer  |
-| 7  | IEEE 754 32 Bit Real  |
-==== Layer Attributes ====
-The layer attributes((Currently, only the layer name is the only layer specific attribute returned.)) are returned in a second table. This table has the following format.
-^ Column Name  ^ Key or Data?  ^ Column Type  ^ Description  ^
-| "Layer_Index"  | Key  | Real  | The index of the corresponding layer  |
-| "Layer_Name"  | Key  | String  | The name of the corresponding layer  |
 ===== Internal Name =====
 ExtractCategoricalMapAttributes