getRegion
@svenvw/fdm-source / fdm-calculator/src / getRegion
Function: getRegion()
getRegion(
b_centroid):Promise<RegionKey>
Defined in: fdm-calculator/src/norms/nl/2025/stikstofgebruiksnorm.ts:69
Determines the soil region for a given field based on its geographical coordinates.
This function queries a GeoTIFF file representing the official "grondsoortenkaart" from the Dutch Meststoffenwet (Manure Law). It identifies whether the field's centroid falls within one of the predefined soil regions: "klei", "loess", "veen", "zand_nwc", or "zand_zuid".
The soil region is a critical factor in determining the applicable nitrogen usage norms, as these standards vary significantly between different soil types.
Parameters
b_centroid
Field
A tuple containing the longitude and latitude of the field's centroid. This coordinate is used to look up the corresponding value in the GeoTIFF file.
Returns
Promise<RegionKey>
A promise that resolves to a RegionKey, which is a string literal representing the soil region
(e.g., "zand_nwc", "klei").
Throws
If the GeoTIFF file cannot be fetched, if the coordinates fall outside the bounds of the map, or if the returned region code is unknown.