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field_methods:line-point_intercept_with_height

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<sup>[[:bug_reporting|Report a bug, broken link, or incorrect content]]</sup> ====== Line-point Intercept with Height ====== [[http://www.landscapetoolbox.org/about/get_involved|{{:abstract_in_dev.gif|}}]]\\ written by Jason Karl ===== Description and Uses ===== This method of estimating vegetation structure in a plot uses a modification of the standard [[field_methods:line_point_intercept]] method. Height measurements are taken at pre-determined points along a transect. At each point, the height and species of the tallest vegetation within a fixed-radius circle (typically 6in or approximately 15cm) is recorded. The height recorded is the tallest height of the entire plant that falls within the vertical cylinder centered at the point, not just the height of the portion of the plant within the cylinder. Both living and dead vegetation are usually counted. \\ \\ A number of different height/structural indices can be calculated from this method including average vegetation height with standard deviations and structural diversity. ===== Advantages and Limitations ===== Of the different vegetation height/structure methods, this on is one of the easiest and fastest to implement because it uses the transects that are already in place for estimating cover. The NRI implementation of this method uses height classes to speed up data collection. \\ \\ This is a relatively new method that has not been published on extensively. Because this method is so new, there is not a lot of guidance on calculating structure/height indices from the data. ===== Manuals ===== *2009 NRCS National Resource Inventory (NRI) Grazing Land On-Site Study Handbook.[[http://www.nrisurvey.org/nrcs/range/resource/2009/Instructions/instruction.htm]] ===== Technical and Application References ===== * To date, the only known application of this method is as part of the NRCS National Resource Inventory (NRI) Grazing Land On-Site Study [[http://www.nrisurvey.org/nrcs/range/resource/2009/Power_points.htm]] ===== Similar Approaches ===== [[:field_methods:vegetation_structure_-_cover_pole_method]], [[:field_methods:visual_obstruction_method]], [[field_methods:cover_board_method]] ===== Additional Information ===== ===== Web Search Results ===== <html> <script src="http://www.google.com/jsapi"></script> <script language="Javascript" type="text/javascript">//<![CDATA[ google.load('search', '1.0'); function OnLoad() { var searchString = '"line point intercept height"'; // create a tabbed mode search control var searchControl = new google.search.SearchControl(); options = new google.search.SearcherOptions(); options.setExpandMode(google.search.SearchControl.EXPAND_MODE_OPEN); options.setRoot(document.getElementById("web_results")); searchControl.addSearcher(new google.search.WebSearch(), options); var drawOptions = new google.search.DrawOptions(); options2 = new google.search.SearcherOptions(); options2.setExpandMode(google.search.SearchControl.EXPAND_MODE_OPEN); searchControl.addSearcher(new google.search.BookSearch(), options2); searchControl.draw(document.getElementById("book_results"), drawOptions); // execute searches searchControl.execute(searchString); } google.setOnLoadCallback(OnLoad, true); //]]> </script> <table border="0"> <tr><td width="50%"> <div class="search-control" id="book_results">Loading...</div> </td> <td width="50%"> <div class="search-control" id="web_results">Loading...</div> </td> </tr> </table> </html> ===== Discussion/Comments ===== <sub>**You must have an account and be logged in to post or reply to the discussion topics below. Registration is free and fast - [[http://wiki.landscapetoolbox.org/doku.php/Home?do=login&sectok=db3676cff5bcd873b609b4e582432d73|Click here]].**</sub> ~~DISCUSSION| ~~

field_methods/line-point_intercept_with_height.1330706383.txt.gz · Last modified: 2012/03/02 09:39 by jgillan