> For the complete documentation index, see [llms.txt](https://docs.geopard.tech/geopard-tutorials/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.geopard.tech/geopard-tutorials/swe/api-dokumentation/oversikt-over-geopard-api-anrop/48.-fraga-hamta-rutnatsdata-fran-topographymap.md).

# 48. Fråga: Hämta rutnätsdata från "TopographyMap"

Fråga för att hämta källdata från rasterdatasetet relaterat till "TopographyMap" som `GEOJSON`  med punkter eller `GEOTIFF`. Egenskapsattributet innehåller alla topografiska derivat (som DEM, lutning, reliefdel, ruhet, exponering, hillshade, etc.) per punkt. 

#### 1. Begär en fil för export

{% hint style="danger" %}
Rekommenderas att endast hämta ett enda dataset med `sourceDataUrl` per förfrågan. 
{% endhint %}

`NoBuffer`, `PlusOnePixel`, `PlusTwoPixels`, `MinusOnePixel`, och `MinusTwoPixels` är tillgängliga som en `buffert`.

`GEOJSON` och `GEOTIFF` är tillgängliga som ett format. 

{% code overflow="wrap" lineNumbers="true" %}

```graphql
query GetGriddedDataFromTopographyMap {
  getFarms (farmUuids: ["<placeholder_of_farm_uuid>"]){
    uuid
    fields (fieldUuids: ["<placeholder_of_field_uuid>"]) {
      uuid
      topographyMaps(topographyMapUuids: ["<placeholder_of_topography_uuid>"]) {
        uuid
        sourceDataUrl(format: GEOJSON buffer: PlusTwoPixels)
      }
    }
  }
}
```

{% endcode %}

#### 2. Ladda ner den genererade filen

Efter att filen har förberetts kan den laddas ner med `curl` eller en liknande metod.

{% hint style="danger" %}
`sourceDataUrl` länken är åtkomlig endast under **60 sek.**
{% endhint %}

{% code overflow="wrap" lineNumbers="true" %}

```bash
curl '<sourceDataUrl>' --compressed >> '<local_filepath>'
```

{% endcode %}


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