Graduate Thesis Or Dissertation
 

Probability proportional to size sampling of Douglas-fir from aerial photography

Public Deposited

Downloadable Content

Download PDF
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/d791sm557

Descriptions

Attribute NameValues
Creator
Abstract
  • This experiment was designed to investigate the use of volume estimations from aerial photography and probability proportional to size (PPS) sample selection in the development of a practical sampling design for timber volume estimation on small land areas of Pacific Northwest Douglas -fir (Pseudotsuga menziesii, Franco). The major problem of measuring exact stand height to predict stand volume from aerial photos was overcome by the development of two new volume equations which use percent crown closure, visible crown diameter and height classes as the independent variables. By the use of height classes, the photo interpreter is required to separate stand heights as to tall, medium or short. Equations are presented for both board- and cubic-foot volumes. Two computer programs were developed which reduce office calculations to a minimum. The programs compute photo volumes per plot, total gross and net volume estimations per area, standard errors and select the field plots to be sampled. The sampling design was tested on four test areas, using both quarter- and one-acre photo plots, and quarter-acre fixed-area and variable-area field plots at four photo scales. Based on these results a sample of about 20 field measured quarter-acre field plots combined with a 100 percent photo cruise on 1:7,000 aerial photos would be expected to produce gross volume estimations for a forty-acre tract of + 10 percent. at a 68 percent confidence level.
Resource Type
Date Available
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Publisher
Peer Reviewed
Language
Digitization Specifications
  • Master files scanned at 600 ppi (256 Grayscale) using Capture Perfect 3.0 on a Canon DR-9080C in TIF format. PDF derivative scanned at 300 ppi (256 Grayscale), using Capture Perfect 3.0, on a Canon DR-9080C. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces

Relationships

Parents:

This work has no parents.

In Collection:

Items

Thumbnail Title Date Uploaded Visibility Actions
file details Rogers_Roger_Allan_1972.pdf 2017-10-24 Public Download