# File naming

## GeoPackage file naming <a href="#id-1.5.1-geopackage" id="id-1.5.1-geopackage"></a>

If GeoPackage format is selected, the filename will be constructed as: OSMasterMapTopography\_gpkg\_<*order number*>.zip

Where:

* order number is your customer order number.

Within the zip file, there will be a Data folder (containing six GeoPackage files – one file per feature type)

and a Doc folder (containing licence and readme files):

* Data folder
  * OSMasterMapTopography\_<*order number*>\_boundary\_line.gpkg
  * OSMasterMapTopography\_<*order number*>\_cartographic\_symbol.gpkg
  * OSMasterMapTopography\_<*order number*>\_cartographic\_text.gpkg
  * OSMasterMapTopography\_<*order number*>\_topographic\_area.gpkg
  * OSMasterMapTopography\_<*order number*>\_topographic\_line.gpkg
  * OSMasterMapTopography\_<*order number*>\_topographic\_point.gpkg
* Doc folder: \<licence and readme files>

## Vector tiles file naming

If vector tiles format is selected, the file name will be constructed as: OSMasterMapTopography\_mbtiles\_gb.zip

Within the zip file, there will be a Data folder (containing six MBTiles files – one file per feature type) and a Doc folder (containing licence and readme files):

* Data folder
  * OSMasterMapTopography\_gb\_BoundaryLine.mbtiles
  * OSMasterMapTopography\_gb\_CartographicSymbol.mbtiles
  * OSMasterMapTopography\_gb\_CartographicText.mbtiles
  * OSMasterMapTopography\_gb\_TopographicArea.mbtiles
  * OSMasterMapTopography\_gb\_TopographicLine.mbtiles
  * OSMasterMapTopography\_gb\_TopographicPoint.mbtiles
* Doc folder: \<licence and readme files>

## GML file naming <a href="#id-1.5.3-gml" id="id-1.5.3-gml"></a>

### **Geographic chunks (zipped)**

If geographic chunk data supply is used, the file name will be constructed as: orderNumber-ngxxyy.gz Where:

* orderNumber is your customer order number.
* ngxxyy is the chunk name plus the four-digit grid reference belonging to the 1km south-west corner of the 2km / 5km / 10km chunk being supplied.

For example: 1234567-SU4020.gz

### **Non-geographic chunks (zipped)**

If non-geographic chunk data supply is selected, the file name will be constructed as: orderNumber- vvvvvv.gz

Where:

* orderNumber is your customer order number.
* vvvvvv is the volume number of the file.

For example: 1234567-000001.gz


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.os.uk/os-downloads/products/maps-and-imagery-portfolio/os-mastermap-topography-layer/os-mastermap-topography-layer-technical-specification/file-naming.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.