airdist

annotate the plot with line measured and distance


Measure a distance between two points on a plot using <code>locator</code>; the function checks <code>par("plt")</code> and <code>par("usr")</code> to try to ensure that the aspect ratio y/x is 1, that is that the units of measurement in both x and y are equivalent.


spatial

A collection of functions to create spatial weights matrix
objects from polygon contiguities, from point patterns by distance and
tessellations, for summarizing these objects, and for permitting their
use in spatial data analysis, including regional aggregation by minimum
spanning tree; a collection of tests for spatial autocorrelation,
including global Moran's I, APLE, Geary's C, Hubert/Mantel general cross
product statistic, Empirical Bayes estimates and Assunção/Reis Index,
Getis/Ord G and multicoloured join count statistics, local Moran's I
and Getis/Ord G, saddlepoint approximations  and exact tests for global
and local Moran's I; and functions for estimating spatial simultaneous
autoregressive (SAR) lag and error models, impact measures for lag
models, weighted and unweighted SAR and CAR spatial regression models,
semi-parametric and Moran eigenvector spatial filtering, GM SAR error
models, and generalized spatial two stage least squares models.

airdist: Measure distance from plot

Description

Usage

Arguments

Value

See Also