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...s the status''' of the relationship between ''dbh'' and height for a given point in time. '''It is not a growth curve'''. It can, therefore, not be used to ...all sample trees, but height only for a small sub-set, for example on each sample plot the one or two trees closest to the plot center are height measured. F

... sample trees that are within a defined distance (radius) from the sample point, which constitutes the plot center (Kleinn 2007<ref name="kleinn2007">Klei ... Those trees are taken as sample trees in whose inclusion zones the sample point comes to lie (Kleinn 2007<ref name="kleinn2007">Kleinn, C. 2007. Lecture No

...o lie close to the [[Forest Boundary|forest boundary]] so that part of the sample plot slops over. Of course, if this is not taken into account, an error is ...ce a systematic error. [[Plot shifting]] is – from a strict statistical point of view – never permitted. Using option D in Figure 1, one needs to tak

... (observer bias). A systematic error cannot be compensated by increasing [[sample size]]. ...bability sampling]] approach (or [[plot design]]). Trees are included in a sample, if they appear bigger that a defined opening angle. Basal area can be esti

..._vilcko2006">Kleinn C. and F. Vilčko 2006. Design unbiased estimation for point to tree distance sampling. Canadian Journal of Forest Research 36(6):1407-1 ...e (e.g. the radius of a circular plot up to which trees are included in a sample) is defined, here the number of included trees per sampling location is fix

.... Consequently, the [[population]] from which we sample is a population of sample plots. ... sample plots of identical shape and size, here: square and hexagonal sample plots. Such a subdivision is also possible for rectangles and some types

...xed plot area ''a_k'' for an expected number of ''k'' trees per sample plot is ...math>. The variance of the estimated mean <math>\bar y</math> for a random sample of a given size n follows then from

Estimations are the principal result of sampling studies. All results of a sample are estimations and must be interpreted as such; they help us to learn some |sample based estimation

...ean at point 2 in time and <math>\bar{y_1}</math> is the estimated mean at point 1 in time. The estimated change is a linear combination of two random vari ...ent randomizations were done, and, therefore, different [[Fixed area plots|sample plots]] selected. The change is estimated then along <math>c=\bar{y_2}-\bar

...t is simply counted how many points fall into forest; if, out of the total sample size ''n'' there are <math>n_f</math> forest points, then the forest cover which is the parametric variance. The sample based estimation of that variance has <math>(n-1)</math> degrees of freedom

...mple based estimation either in remote sensing imagery or from terrestrial sample plots. ... 2005 October 3-6, Portland, Maine. Program and Abstracts: 78.</ref>) uses sample based forest edge length estimates to characterise forest edge-interior fra

...n. It is more probable that there are various very good options. The major point is to avoid pitfalls and errors, and that is best done by consulting with e ...teams do exactly the same. Some more points about this extremely important point are discussed in the following;

...oned glass plate that is used to make an [[Bitterlich sampling|angle count sample]]. You can estimate [[basal area]] with [[Bitterlich_sampling#Choice_of_bas ...ple]] moving around the prism – while the prism is located at the sample point.

Based on a coherent network of [[Fixed area plots|sample plots]] distributed over the total [[forest Definition|forest area]] of the ===Extension of the monitoring concept using a systematic grid of sample plots===

...uracy assessment we need an additional independent reference data set. The sample size should be large enough to divide the reference data into training and # Generating sample points

...nuals on the [http://cran.r-project.org/ R website]. Another good starting point is the [http://www.statmethods.net/ Quick-R website].

...ny methodological framework that helps to make use of the data sources for sample based estimation. Depending on the available spatial resolution of images, ...stance of points is constant along the latitudes. Here a global GSG with a point distance of 250km is shown in a cylindrical map projection.

# Type in the search bar {{typed|text=Point sampling tool}}, click on the plugin name and then on {{button|text=Install # Load the regular grid as vector point file ''systematic_grid100.shp''' created by [[Creating regular grid]].

...m-in to the points and click on a land cover/use pixel associated with the point attribute to create a ROI. ...d '''Max''' as 30. Click the button {{button|text=Redo the roi at the same point}} [[File:Redo.PNG]] to capture more spectrally similar pixels.