EBookClubs

Read Books & Download eBooks Full Online

EBookClubs

Read Books & Download eBooks Full Online

Book Annual Design based Estimation for the Annualized Inventories of Forest Inventory and Analysis

Download or read book Annual Design based Estimation for the Annualized Inventories of Forest Inventory and Analysis written by Hans T. Schreuder and published by . This book was released on 2000 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Forest Inventory and Analysis units in the USDA Forest Service have been mandated by Congress to go to an annualized inventory where a certain percentage of plots, say 20 percent, will be measured in each State each year. Although this will result in an annual sample size that will be too small for reliable inference for many areas, it is a sufficiently large sample to draw annual inferences for large areas in terms of what is there and how much has changed on an annual basis. This is extremely useful in estimating the state of the forest in the country over time in terms of health, timber supply, and so forth. The formula for estimating sample size required is: [mathematical equation] where s2 is the estimated variance for parameter estimates [mathematical equation], and p is the desired level of precision expressed as percent of [symbol] . We conclude that for p = 5 percent, based on sampling 1 ha plots on all National Forests in Oregon and Washington, that a sample size of 9,400 plots with a corresponding area of 22,560,000 ha, about the size of the State of Idaho, is sufficient to draw annual inferences. Alternatively, an area of 1,000,000 ha requires a sample size of 417 plots. Clearly p = 5 percent is a tough specification. If we go to p = 10 percent, which may be adequate for many purposes, we require one-fourth the sample size above, or 2,350 plots representing an area of about 5,640,000 ha, about the size of West Virginia (24,070 square miles). With this specification, a sample of 2,350 plots would give adequate precision.

Book Annual Design Based Estimation For The Annualized Inventories Of Forest Inventory And Analysis Sample General Technical Report RMRS GTR 66 U S Department Of Agriculture October 2000

Download or read book Annual Design Based Estimation For The Annualized Inventories Of Forest Inventory And Analysis Sample General Technical Report RMRS GTR 66 U S Department Of Agriculture October 2000 written by and published by . This book was released on 2000* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Enhanced Forest Inventory and Analysis Program national Sampling Design and Estimation Procedures

Download or read book The Enhanced Forest Inventory and Analysis Program national Sampling Design and Estimation Procedures written by and published by . This book was released on 2005 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Forest Inventory and Analysis (FIA) Program of the U.S. Department of Agriculture, Forest Service is in the process of moving from a system of quasi-independent, regional, periodic inventories to an enhanced program featuring greater national consistency, a complete and annual sample of each State, new reporting requirements, and integration with the ground sampling component of the Forest Health Monitoring Program. This documentation presents an overview of the conceptual design, describes the sampling frame and plot configuration, presents the estimators that form the basis of FIA's National Information Management System (NIMS), and shows how annual data are combined for analysis. It also references a number of Web-based supplementary documents that provide greater detail about some of the more obscure aspects of the sampling and estimation system, as well as examples of calculations for most of the common estimators produced by FIA.

Book Data Estimation and Prediction for Natural Resources Public Data

Download or read book Data Estimation and Prediction for Natural Resources Public Data written by Hans T. Schreuder and published by . This book was released on 1998 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: A key product of both Forest Inventory and Analysis (FIA) of the USDA Forest Service and the Natural Resources Inventory (NRI) of the Natural Resources Conservation Service is a scientific data base that should be defensible in court. Multiple imputation procedures (MIPs) have been proposed both for missing value estimation and prediction of non-remeasured cells in annualized forest inventories such as the Southern Annual Forest Inventory System (SAFIS). MIPs generate clean-looking data bases that are easily used but hide a serious weakness: under different assumptions made by reasonable people, very different data bases and conclusions can be generated. A MIP is an interesting idea for prediction but should only be used for analyses by users, not for filling in data in a public data base. Simple illustrations are given to make our points. To maintain a defensible data base, FIA and NRI should only provide algorithms to facilitate user-generated data for prediction of non-remeasured cells. Users, not FIA and NRI, should be responsible for generating data bases that utilize these algorithms or other algorithms of their choosing, incorporating assumptions that they are willing to make. But they should be encouraged to work with FIA and NRI personnel in utilizing such algorithms.

Book Small area estimation in forest inventories New needs methods and tools

Download or read book Small area estimation in forest inventories New needs methods and tools written by Barry Wilson and published by Frontiers Media SA. This book was released on 2023-04-17 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Forest Inventory and Analysis Database

Download or read book The Forest Inventory and Analysis Database written by Sharon W. Woudenberg and published by Createspace Independent Pub. This book was released on 2012-10-19 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication is based on previous documentation of the nationally standardized Forest Inventory and Analysis database (Hansen and others 1992; Woudenberg and Farrenkopf 1995; Miles and others 2001). Documentation of the structure of the Forest Inventory and Analysis database (FIADB) for Phase 2 data, as well as codes and definitions, is provided. Examples for producing population level estimates are also presented. This database provides a consistent framework for storing forest inventory data across all ownerships for the entire United States. Forest Inventory and Analysis (FIA) is a continuing endeavor mandated by Congress in the Forest and Rangeland Renewable Resources Planning Act of 1974 and the McSweeney-McNary Forest Research Act of 1928. FIA's primary objective is to determine the extent, condition, volume, growth, and depletion of timber on the Nation's forest land. Before 1999, all inventories were conducted on a periodic basis. The passage of the 1998 Farm Bill requires FIA to collect data annually on plots within each State. This kind of up-to-date information is essential to frame realistic forest policies and programs. USDA Forest Service regional research stations are responsible for conducting these inventories and publishing summary reports for individual States. In addition to published reports, the Forest Service provides data collected in each inventory to those interested in further analysis. This report describes a standard format in which data can be obtained. This standard format, referred to as the Forest Inventory and Analysis Database (FIADB) structure, was developed to provide users with as much data as possible in a consistent manner among States. A number of inventories conducted prior to the implementation of the annual inventory are available in the FIADB. However, various data attributes may be empty or the items may have been collected or computed differently. Annual inventories use a common plot design and common data collection procedures nationwide, resulting in greater consistency among FIA work units than earlier inventories. Data field definitions note inconsistencies caused by different sampling designs and processing methods.

Book General Technical Report RMRS

Download or read book General Technical Report RMRS written by and published by . This book was released on 1998 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Three Proposed Data Collection Models for Annual Inventories

Download or read book Three Proposed Data Collection Models for Annual Inventories written by and published by . This book was released on 2005 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three competing data collection models for the U.S. Department of Agriculture Forest Service Forest Inventory and Analysis (FIA) program's annual inventories are presented. We show that in the presence of panel creep, the model now in place does not meet requirements of an annual inventory system mandated by the 1998 Farm Bill. Two data-collection models that use subpaneling are defined, and the pros and cons of using those models are discussed. The only data-collection model ensuring full compliance with the Farm Bill uses subpaneling with both spatial and temporal controls, resulting in the measurement of a single panel per year, nationally. The same field manual, portable data recorder, edit system, processing system, and estimation methods can be used within and among FIA regions. Such use will result in less duplication of effort and provide national consistency. The FIA program can produce, nationally, an annual database and annual estimates, as well as periodic reports based on 5-year-measurement requirements. Additional benefits will include the means to adjust measurement resources quickly and efficiently in order to measure resource availability by State. Additionally, the true sampling precision per fixed time-period is known, and intensification and detensifications are easy.

Book Sampling Techniques for Forest Inventories

Download or read book Sampling Techniques for Forest Inventories written by Daniel Mandallaz and published by CRC Press. This book was released on 2007-10-26 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sound forest management planning requires cost-efficient approaches to optimally utilize given resources. Emphasizing the mathematical and statistical features of forest sampling to assess classical dendrometrical quantities, Sampling Techniques for Forest Inventories presents the statistical concepts and tools needed to conduct a modern for

Book General Technical Report SRS

Download or read book General Technical Report SRS written by and published by . This book was released on 2003 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Comprehensive Regional Resource Assessments and Multipurpose Uses of Forest Inventory and Analysis Data 1976 to 2001

Download or read book Comprehensive Regional Resource Assessments and Multipurpose Uses of Forest Inventory and Analysis Data 1976 to 2001 written by Victor A. Rudis and published by . This book was released on 2003 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Estimation Procedures for the Combined 1990s Periodic Forest Inventories of California Oregon and Washington

Download or read book Estimation Procedures for the Combined 1990s Periodic Forest Inventories of California Oregon and Washington written by Tara M. Barrett and published by . This book was released on 2004 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the 1990s, forest inventories for California, Oregon, and Washington were conducted by different agencies using different methods. The Pacific Northwest Research Station Forest Inventory and Analysis program recently integrated these inventories into a single database. This document briefly describes potential statistical methods for estimating population totals, means, and associated sampling errors for these inventories. Differences in estimates using past methods for periodic inventories compared to estimates from proposed methods for a new annual inventory system were generally minor. This document is intended to be a resource for researchers using the 1990s forest inventory data for these states; examples are included to illustrate issues.