Development of design unbiased estimators for the restricted k-tree sampling techniques PCM (point-centered quarter method) and T-square sampling

Description: Das Projekt "Development of design unbiased estimators for the restricted k-tree sampling techniques PCM (point-centered quarter method) and T-square sampling" wird vom Umweltbundesamt gefördert und von Universität Göttingen, Burckhardt-Institut, Abteilung Waldinventur und Fernerkundung durchgeführt. k-tree sampling is frequently applied in ecological sampling; less so in forest inventory for the concern of unbiasedness. A design-unbiased estimator had recently been developed (Kleinn and Vilcko 2006), using inclusion zones that quantify the per-tree selection probability - but that are laborious to determine in the field (higher order Voronoi diagrams). That estimation approach shall be further developed in this project for restricted k-tree sampling; that is to the point-centered-quarter method and to the T-square sampling technique. New approaches are required, the higher order Voronoi diagrams do not apply. Also, we wish to clarify the following research questions for both unrestricted and restricted k-tree sampling:Can the selection probability be approximated by regressing them to easily measurable inter-tree distances at the sample point - How compares the unbiased estimator for restricted/unrestricted k-tree sampling to fixed area plots in terms of precision for different point patterns - Can tree mapping be optimized by an integrated field computing and measurement system - Theoretical analyses and simulation studies on real data will be carried and also field testing. The results will be equally important for forest inventory sampling and for ecological sampling.

Types:

SupportProgram

Origin: /Bund/UBA/UFORDAT

Tags: Göttingen ? Baum ? Messeinrichtung ? Ökologie ? Skigebiet ? Kartographie ? Stadtteil ? Karte ? Waldinventur ? Ackerland ? Daten ? Simulation ? Studie ? Messung ? Fernerkundung ? Forschung ? Probenahme ? Planung ? Auslese ? Erlass [Recht] ? Probenahmestelle ? Steuerung und Nutzung der Waldressourcen ?

Region: Lower Saxony

Bounding box: 9.16667° .. 9.16667° x 52.83333° .. 52.83333°

License: cc-by-nc-nd/4.0

Language: Deutsch

Organisations

• Deutsche Forschungsgemeinschaft (Bereitsteller*in)
• Umweltbundesamt (Bereitsteller*in)
• Universität Göttingen, Burckhardt-Institut, Abteilung Waldinventur und Fernerkundung (Betreiber*in)

Time ranges: 2008-01-01 - 2024-11-29

Alternatives

• Language: Englisch/English https://ufordat.uba.de/

Status

Aktiv

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