# Source: https://docs.vespa.ai/en/reference/release-notes/vespa8-geo-migration-guide.html.md

# Position fields - Vespa 8 migration

 

Refer to [Vespa 8 release notes](vespa8.html) - this is a guide on how to migrate from Vespa 7 to Vespa 8 when using position fields. The guide is relevant for applications having a `position` field in a schema.

For the rest of this document, we assume a schema containing:

```
field myfield type position {...}
```

## Step 1: Upgrade to Vespa 8 in geo legacy mode

Add to _services.xml_, see [legacy-v7-json-rendering](../querying/default-result-format.html#geo-position-rendering), add under the root `services` tag:

```
<services>
    <legacy>
        <v7-geo-positions>true</v7-geo-positions>
    </legacy>
```

## Step 2: Result rendering

If the position field is only used as a filter, and not returned in result sets, skip this section. In Vespa 7, a position filed could be rendered as:

```
"myfield.position": {
    "y": 63453700,
    "x": 10460800,
    "latlong": "N63.453700;E10.460800"
}
```

and optionally:

```
"myfield": {
    "y": 63453700,
    "x": 10460800
}
```

With Vespa 8, the result format is changed to:

```
"myfield": {
    "lat": 63.4537,
    "lng": 10.4608
}
```

Note that this is also the Vespa 8 feeding format.

 **Important:** Change all code that parses query results to expect the new format. This includes programs that parses the result JSON and [Searchers](../../applications/searchers.html).

On Vespa 7, the `distance` rank feature is output as:

```
"myfield.distance": 14352,
```

On Vespa 8, use the summary feature instead:

```
distance(myfield).km
```

## Step 3: Query API

Change from using the `pos.ll` / `pos.radius` / `pos.bb` / `pos.attribute` parameters, e.g.:

```
pos.ll=63.4225N+10.3637E&pos.radius=5km
```

to using [YQL](../../querying/query-language.html):

```
where geoLocation(myfieldname, 63.5, 10.5, "5 km")
```

## Step 4: Feeding format and /document/v1/ API

The Vespa 7 feeding format can be used on Vespa 8, it is however recommended changing to:

```
"myfield": {
    "lat": 63.4537,
    "lng": 10.4608
}
```

This is the same format as in query results.

The result format when using GET / VISIT in [document/v1/](../api/document-v1.html) is changed from:

```
"myfield": {
    "y": 63453700,
    "x": 10460800
}
```

to:

```
"myfield": {
    "lat": 63.4537,
    "lng": 10.4608
}
```

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