pyforestry.sweden.bark package

Submodules

pyforestry.sweden.bark.hannrup_2004 module

pyforestry.sweden.bark.hannrup_2004.Hannrup_2004_bark_picea_abies_sweden(diameter_at_height_mm: float, diameter_breast_height_mm: float | Diameter_cm) → float[source]

Calculates double bark thickness for Norway Spruce in Sweden based on diameter.

Based on the function presented in Skogforsk Arbetsrapport 575-2004.

Parameters:

  • diameter_at_height_mm (float) – Diameter over bark at the point of interest along the stem, in millimeters.

  • diameter_breast_height_mm (Union[float, Diameter_cm]) – Diameter at breast height (1.3m) over bark, in millimeters. Must be in the same units as diameter_at_height_mm. If Diameter_cm is passed, it’s converted to mm.

Returns:

Estimated double bark thickness at the point corresponding to

diameter_at_height_mm, in millimeters. Minimum value is 2 mm.

Return type:

float

Raises:

  • ValueError – If inputs are non-positive or dbh is zero.

  • TypeError – If diameter input types are invalid.

References

Hannrup, Björn. (2004). Funktioner för skattning av barkens tjocklek hos tall och gran vid avverkning med skördare [Functions for estimating bark thickness of Scots pine and Norway spruce at harvester felling]. Arbetsrapport 575. Skogforsk. Uppsala Science Park, Sweden. 34 pp. ISSN: 1404-305X. Available Online [2025-04-17]: https://www.skogforsk.se/contentassets/960ad964391d489785f97f9eaeeaf174/arbetsrapport-575-2004.pdf

Notes

  • This function calculates bark thickness based on the diameter at a given point relative to the breast height diameter. It does not directly use stem height or latitude.

  • The function returns DOUBLE bark thickness in MILLIMETERS.

  • Only applicable to Picea abies in Sweden.

pyforestry.sweden.bark.hannrup_2004.Hannrup_2004_bark_pinus_sylvestris_sweden(diameter_breast_height_mm: float | Diameter_cm, latitude: float, stem_height_cm: float) → float[source]

Calculates double bark thickness at a given stem height for Scots Pine in Sweden.

Based on the “Sf_tall” function presented in Skogforsk Arbetsrapport 575-2004.

Parameters:

  • diameter_breast_height_mm (Union[float, Diameter_cm]) – Diameter at breast height (1.3m) over bark, in millimeters. If Diameter_cm is passed, it will be converted to mm. Diameters over 590mm are capped at 590mm internally for the calculation.

  • latitude (float) – Latitude in decimal degrees (e.g., 63.82).

  • stem_height_cm (float) – The height along the stem (from ground level) where bark thickness is desired, in centimeters.

Returns:

Estimated double bark thickness at the specified stem_height_cm,

in millimeters. Minimum value returned is 2 mm.

Return type:

float

Raises:

  • ValueError – If inputs are outside reasonable ranges (e.g., negative diameter, invalid latitude, negative stem height).

  • TypeError – If diameter input type is invalid.

References

Hannrup, Björn. (2004). Funktioner för skattning av barkens tjocklek hos tall och gran vid avverkning med skördare [Functions for estimating bark thickness of Scots pine and Norway spruce at harvester felling]. Arbetsrapport 575. Skogforsk. Uppsala Science Park, Sweden. 34 pp. ISSN: 1404-305X. Available Online [2025-04-17]: https://www.skogforsk.se/contentassets/960ad964391d489785f97f9eaeeaf174/arbetsrapport-575-2004.pdf

Notes

  • This function calculates bark thickness at any point along the stem height, not just at breast height.

  • It requires latitude as an input.

  • The function returns DOUBLE bark thickness in MILLIMETERS.

  • Only applicable to Pinus sylvestris in Sweden.

Module contents