> For the complete documentation index, see [llms.txt](https://docs.os.uk/os-downloads/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.os.uk/os-downloads/products/maps-and-imagery-portfolio/os-mastermap-topography-layer/os-mastermap-topography-layer-technical-specification/attribute-mapping.md).

# Attribute mapping

The naming of attributes will be different between the various formats due to the differing naming conventions associated with each format (for example, presence of underscores, character limitations and capitalisation). Therefore, the following tables map the differing format attribute names to one another for each feature type.

{% hint style="info" %}
*Please note that the 'fid' attribute in the GeoPackage format does not align to the 'fid' attribute in the GML format. In GeoPackage, 'fid' is a mandatory field that is procedurally generated, with a non-persistent number, when the format is produced. In GML, the 'fid' attribute houses the feature's unique TOID.*
{% endhint %}

### Boundary Line <a href="#id-8.1-boundary-line" id="id-8.1-boundary-line"></a>

| GeoPackage             | Vector tiles       | GML                |
| ---------------------- | ------------------ | ------------------ |
| fid                    | N/A                | N/A                |
| toid                   | toid               | fid                |
| feature\_code          | N/A                | featureCode        |
| version                | N/A                | version            |
| version\_date          | N/A                | versionDate        |
| theme                  | theme              | theme              |
| accuracy\_of\_position | N/A                | accuracyOfPosition |
| change\_date           | N/A                | changeDate         |
| reason\_for\_change    | N/A                | reasonForChange    |
| descriptive\_group     | N/A                | descriptiveGroup   |
| descriptive\_term      | N/A                | descriptiveTerm    |
| physical\_level        | N/A                | physicalLevel      |
| physical\_presence     | N/A                | physicalPresence   |
| style\_description     | style\_description | N/A                |
| style\_code            | style\_code        | N/A                |

### Cartographic Symbol <a href="#id-8.2-cartographic-symbol" id="id-8.2-cartographic-symbol"></a>

| GeoPackage             | Vector tiles       | GML              |
| ---------------------- | ------------------ | ---------------- |
| fid                    | N/A                | N/A              |
| toid                   | toid               | fid              |
| feature\_code          | N/A                | featureCode      |
| version                | N/A                | version          |
| version\_date          | N/A                | versionDate      |
| theme                  | theme              | theme            |
| change\_date           | N/A                | changeDate       |
| reason\_for\_change    | N/A                | reasonForChange  |
| descriptive\_group     | N/A                | descriptiveGroup |
| descriptive\_term      | N/A                | descriptiveTerm  |
| orientation            | orientation        | orientation      |
| physical\_level        | N/A                | physicalLevel    |
| physical\_presence     | N/A                | physicalPresence |
| reference\_to\_feature | N/A                | N/A              |
| style\_code            | style\_code        | N/A              |
| style\_description     | style\_description | N/A              |

### Cartographic Text <a href="#id-8.3-cartographic-text" id="id-8.3-cartographic-text"></a>

| GeoPackage          | Vector tiles       | GML              |
| ------------------- | ------------------ | ---------------- |
| fid                 | N/A                | N/A              |
| toid                | toid               | fid              |
| feature\_code       | N/A                | featureCode      |
| version             | N/A                | version          |
| version\_date       | N/A                | versionDate      |
| theme               | theme              | theme            |
| change\_date        | N/A                | changeDate       |
| reason\_for\_change | N/A                | reasonForChange  |
| descriptive\_group  | N/A                | descriptiveGroup |
| descriptive\_term   | N/A                | descriptiveTerm  |
| make                | N/A                | make             |
| physical\_level     | N/A                | physicalLevel    |
| physical\_presence  | N/A                | physicalPresence |
| anchor\_position    | N/A                | anchorPosition   |
| font                | N/A                | font             |
| height              | height             | height           |
| orientation         | N/A                | orientation      |
| text\_string        | text\_string       | textString       |
| style\_description  | style\_description | N/A              |
| style\_code         | style\_code        | N/A              |
| colour\_code        | colour\_code       | N/A              |
| font\_code          | font\_code         | N/A              |
| rotation            | rotation           | N/A              |
| geo\_x              | geo\_x             | N/A              |
| geo\_y              | geo\_y             | N/A              |
| anchor              | anchor             | N/A              |

### Topographic Area <a href="#id-8.4-topographic-area" id="id-8.4-topographic-area"></a>

| GeoPackage              | Vector tiles       | GML                 |
| ----------------------- | ------------------ | ------------------- |
| fid                     | N/A                | N/A                 |
| toid                    | toid               | fid                 |
| feature\_code           | N/A                | featureCode         |
| version                 | N/A                | version             |
| version\_date           | N/A                | versionDate         |
| theme                   | theme              | theme               |
| calculated\_area\_value | N/A                | calculatedAreaValue |
| change\_date            | N/A                | changeDate          |
| reason\_for\_change     | N/A                | reasonForChange     |
| descriptive\_group      | N/A                | descriptiveGroup    |
| descriptive\_term       | N/A                | descriptiveTerm     |
| make                    | N/A                | make                |
| physical\_level         | N/A                | physicalLevel       |
| physical\_presence      | N/A                | physicalPresence    |
| style\_description      | style\_description | N/A                 |
| style\_code             | style\_code        | N/A                 |

### Topographic Line <a href="#id-8.5-topographic-line" id="id-8.5-topographic-line"></a>

| GeoPackage                                 | Vector tiles       | GML                         |
| ------------------------------------------ | ------------------ | --------------------------- |
| fid                                        | N/A                | N/A                         |
| toid                                       | toid               | fid                         |
| feature\_code                              | N/A                | featureCode                 |
| version                                    | N/A                | version                     |
| version\_date                              | N/A                | versionDate                 |
| theme                                      | N/A                | theme                       |
| accuracy\_of\_position                     | N/A                | accuracyOfPosition          |
| change\_date                               | N/A                | changeDate                  |
| reason\_for\_change                        | N/A                | reasonForChange             |
| descriptive\_group                         | N/A                | descriptiveGroup            |
| descriptive\_term                          | N/A                | descriptiveTerm             |
| non\_bounding\_line                        | N/A                | nonBoundingLine             |
| height\_above\_datum                       | N/A                | heightAboveDatum            |
| accuracy\_of\_height\_above\_datum         | N/A                | accuracyOfHeightAboveDatum  |
| height\_above\_ground\_level               | N/A                | heightAboveGroundLevel      |
| accuracy\_of\_height\_above\_ground\_level | N/A                | accuracyOfHeightAboveGround |
| make                                       | N/A                | make                        |
| physical\_level                            | N/A                | physicalLevel               |
| physical\_presence                         | N/A                | physicalPresence            |
| style\_description                         | style\_description | N/A                         |
| style\_code                                | style\_code        | N/A                         |

### Topographic Point <a href="#id-8.6-topographic-point" id="id-8.6-topographic-point"></a>

| GeoPackage                                 | Vector tiles       | GML                         |
| ------------------------------------------ | ------------------ | --------------------------- |
| fid                                        | N/A                | N/A                         |
| toid                                       | toid               | fid                         |
| feature\_code                              | N/A                | featureCode                 |
| version                                    | N/A                | version                     |
| version\_date                              | N/A                | versionDate                 |
| theme                                      | theme              | theme                       |
| accuracy\_of\_position                     | N/A                | accuracyOfPosition          |
| change\_date                               | N/A                | changeDate                  |
| reason\_for\_change                        | N/A                | reasonForChange             |
| descriptive\_group                         | N/A                | descriptiveGroup            |
| descriptive\_term                          | N/A                | descriptiveTerm             |
| height\_above\_datum                       | N/A                | heightAboveDatum            |
| accuracy\_of\_height\_above\_datum         | N/A                | accuracyOfHeightAboveDatum  |
| height\_above\_ground\_level               | N/A                | heightAboveGroundLevel      |
| accuracy\_of\_height\_above\_ground\_level | N/A                | accuracyOfHeightAboveGround |
| make                                       | N/A                | make                        |
| physical\_level                            | N/A                | physicalLevel               |
| physical\_presence                         | N/A                | physicalPresence            |
| style\_description                         | style\_description | N/A                         |
| style\_code                                | style\_code        | N/A                         |

### Geometry mapping <a href="#id-9.-geometry-mapping" id="id-9.-geometry-mapping"></a>

| Feature type format | GeoPackage      | Vector tiles | GML                        |
| ------------------- | --------------- | ------------ | -------------------------- |
| Boundary Line       | MultiLineString | line         | GM\_MULTICURVE (MULTILINE) |
| Cartographic Symbol | Point           | point        | GM\_POINT (POINT)          |
| Cartographic Text   | Point           | point        | GM\_POINT (POINT)          |
| Topographic Area    | Polygon         | polygon      | GM\_SURFACE (POLYGON)      |
| Topographic Line    | MultiLineString | line         | GM\_MULTICURVE (POLYLINE)  |
| Topographic Point   | Point           | point        | GM\_POINT (POINT)          |


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