AIXM 4.5 Airspace Derived Geometry (Aeronautical Data Management)
Summary
The Import AIXM 4.5 to AIS tool will create a null geometry for an airspace feature if AIXM messages contain instructions to generate derived airspace geometries. This tool updates the null geometry with a polygon derived from other airspace features.
Usage
Polygon construction begins with a starting feature, called the base airspace. This tool unions, intersects, or subtracts additional features, such as component airspace, to the base airspace. AIXM version 4.5 or 5.1 messages supply the information used in generating the new polygon.
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AIXM messages identify the base and component airspaces. Base and component airspaces exist in a one-to-many relationship.
Geometric operators, listed in an order of operations, control how the base and component airspaces are combined. AIXM messages can use the following operators:
- Union
- Subtract
- Intersect
- Copy the same extent of existing geometries
AIXM messages provide a number sequence for the order of operations against the base and component airspaces.
If AIXM messages reference a base or component feature missing in the database, the tool will not create the derived geometry.
A connection file specifies the Input Workspace. The Input Workspace Version specifies the version within the input workspace where the new polygon airspace is created.
Syntax
| Parameter | Explanation | Data Type |
in_workspace |
The workspace that contains the AIXM data. | Workspace |
workspace_version |
The geodatabase version in which the geometry updates will occur. | String |
input_feature_sql (Optional) |
An SQL expression used to select a subset of features. The syntax for the expression differs slightly depending on the data source. For example, if you're querying file or ArcSDE geodatabases, shapefiles, or coverages, enclose field names in double quotes: "MY_FIELD" If you're querying personal geodatabases, enclose fields in square brackets: [MY_FIELD] In Python, strings are enclosed in matching single or double quotes. To create a string that contains quotes (as is common with a WHERE clause in SQL expressions), you can escape the quotes (using a backslash) or triple quote the string. For example, if the intended WHERE clause is "CITY_NAME" = 'Chicago' you could enclose the entire string in double quotes, then escape the interior double quotes like this: " \"CITY_NAME\" = 'Chicago' " Or you could enclose the entire string in single quotes, then escape the interior single quotes like this: ' "CITY_NAME" = \'Chicago\' ' Or you could enclose the entire string in triple quotes without escaping: """ "CITY_NAME" = 'Chicago' """ For more information on SQL syntax and how it differs between data sources, see the help topic SQL reference for query expressions used in ArcGIS. | SQL Expression |
Code Sample
The following Python window script demonstrates how to use the AIXM_45_AirspaceDerivedGeometry tool.
# workspace containing the AIXM data
inWorkspace = "c:/data/aeronautical.sde"
# update features in the default version
inVersion = "DBO.DEFAULT"
# execute AIXM45_AirspaceDerivedGeometry
arcpy.AIXM45_AirspaceDerivedGeometry_aeronauticalmanagement(inWorkspace, inVersion)