> 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/dnk/api-dokumentation/diagrammer-med-grundlaeggende-forlob/3.-hent-satellitbilleder.md).

# 3. Hent satellitbilleder

Diagrammet nedenfor viser, hvordan man henter historiske satellitbilleder og modtager nyindhentede, efterhånden som de bliver tilgængelige i GeoPard.

GeoPard understøtter flere udbydere, herunder Sentinel-2, Landsat 4/5/7/8/9 og Planet. Du kan hente satellitbilleder med generiske forespørgsler som `getFarms` og `getFields`, med de relevante data placeret i felt-entiteten ([Forespørgsel 1 eller R1](/geopard-tutorials/dnk/api-dokumentation/geopard-api-foresporgselsoversigt/3.-foresporgsel-hent-satelliteimages.md)). API-forbrugere kan filtrere satellitbilleder efter datointerval, udbyder, skydækkeprocent og renderede geo-korttyper.

For at holde dig opdateret om nyindhentede og behandlede satellitbilleder sender GeoPard API subscription-hændelser via WebSocket ([Forespørgsel 2 eller R2](/geopard-tutorials/dnk/api-dokumentation/geopard-api-foresporgselsoversigt/1.-abonnement-hent-haendelser.md)). Når du modtager en `MODIFY` hændelse for et satellitbillede på det relevante felt, er billedet klar til at blive hentet fra GeoPard API via dets UUID ([Forespørgsel 3 eller R3](/geopard-tutorials/dnk/api-dokumentation/geopard-api-foresporgselsoversigt/4.-foresporgsel-hent-defineret-satelliteimage.md)).

Denne hændelsesdrevne arkitektur sikrer, at API-kunder bliver underrettet hurtigt og kan få adgang til det nyeste satellitbillede, så snart det er behandlet og tilgængeligt.

<figure><img src="/files/43bad0c96353b8d44aa692e593609548282286f3" alt=""><figcaption><p>Sekvensdiagram: Hent historiske og nyindhentede satellitbilleder</p></figcaption></figure>


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