AIXM-319 Aerodrome surface composition additional values

ID:	AIXM-319
target version:	AIXM 5.2
version:	1.0
last updated:	17 AUG 2018
status:	APPROVED

Description

Add new codes to the codelist for CodeSurfaceCompositionBaseType.

Rationale for change

See https://aixmccb.atlassian.net/browse/AIXM-293

The current list of values that describe the composition of a surface is missing several combinations that represent mixed surfaces in the real world. The current list of values already supports some mixed surfaces (e.g., asphalt and grass), so it makes sense to add other mixed surfaces as relevant to ground truth. In particular, the following combinations must be added to the list:

Asphalt and earth
Asphalt and gravel
Concrete and earth
Concrete and gravel
Grass and earth
Grass and gravel

Further, this change is also supported by the FAA Airport Master Record standard (see FAA Advisory Circular 150/5200-35a), as a list of values currently in use.

Impact assessment

There is no impact on existing implementations as the current AIXM 5.1(.1) data remains fully valid against AIXM 5.2. No values are removed from this list.

When receiving data from AIXM 5.2 implementations, current AIXM 5.1(.1) systems will have be able to map back the new value into OTHER:[new value], as described in the mapping rules further in this document.

Change Proposal details

In the UML model, add the following code to CodeSurfaceCompositionBaseType:

ASPH_EARTH (definition: Asphalt and Earth)
ASPH_GRAVEL (definition: Asphalt and Gravel)
CONC_EARTH (definition: Concrete and Earth)
CONC_GRAVEL (definition: Concrete and Gravel)
GRASS_EARTH (definition: Grass and Earth)
GRASS_GRAVEL (definition: Grass and Gravel)

The new coded values are shown in the UML class diagram at the right.

Mapping AIXM 5.1.1 to AIXM 5.2 (forward)

The following algorithm shall be applied:

For each SurfaceCharacteristics.composition that has the value “OTHER: ASPH_EARTH”:

replace the value with “ASPH_EARTH”;

For each SurfaceCharacteristics.composition that has the value “OTHER: ASPH_GRAVEL”:

replace the value with “ASPH_GRAVEL”;

For each SurfaceCharacteristics.composition that has the value “OTHER: CONC_EARTH”:

replace the value with “CONC_EARTH”;

For each SurfaceCharacteristics.composition that has the value “OTHER: CONC_GRAVEL”:

replace the value with “CONC_GRAVEL”;

For each SurfaceCharacteristics.composition that has the value “OTHER: GRASS_EARTH”:

replace the value with “GRASS_EARTH”;

For each SurfaceCharacteristics.composition that has the value “OTHER: GRASS_GRAVEL”:

replace the value with “GRASS_GRAVEL”

Mapping AIXM 5.2 to AIXM 5.1.1 (backward)

The following algorithm shall be applied:

For each SurfaceCharacteristics.composition that has the value “ASPH_EARTH”:

replace the value with “OTHER: ASPH_EARTH”;

For each SurfaceCharacteristics.composition that has the value “ASPH_GRAVEL”:

replace the value with “OTHER: ASPH_GRAVEL”;

For each SurfaceCharacteristics.composition that has the value “CONC_EARTH”:

replace the value with “OTHER: CONC_EARTH”;

For each SurfaceCharacteristics.composition that has the value “CONC_GRAVEL”:

replace the value with “OTHER: CONC_GRAVEL”;

For each SurfaceCharacteristics.composition that has the value “GRASS_EARTH”:

replace the value with “OTHER: GRASS_EARTH”;

For each SurfaceCharacteristics.composition that has the value “GRASS_GRAVEL”:

replace the value with “OTHER: GRASS_GRAVEL”

Mapping example

(Note: for mapping test data see: https://github.com/aixm/mapping_52_511/tree/master/AIXM-319)

AIXM 5.2

AIXM 5.1(.1)