stonetools | R Documentation |
This dataset is a spatial point pattern giving the locations of palaeolithic stone tools (‘lithic’ specimens) and animal bone fragments (‘bone’), accurately surveyed in a layer of soil at David's Site, Olduvai Gorge, Tanzania. The surveyed layer is about 20 cm thick and approximately 1.85 million years old.
Details of the study, and data analysis, are reported by Diez-\Martin et al. (2021). Please cite this article in any use of the data.
The data are presented as a two-dimensional point pattern
with two columns of marks: the vertical position Z
(numeric)
and the type of artefact TYPE
(factor with levels
BONE
and LITHIC
). The window of observation is an
irregular polygon, approximately 40 by 30 metres across.
Spatial coordinates and vertical coordinate are expressed in metres.
There are 3563 bone fragments and 1182 lithic
specimens making a total of 4745 points.
data("stonetools")
Marked spatial point pattern (object of class "ppp"
, see
ppp.object
) with two columns of marks,
Z
(numeric) and TYPE
(factor with levels
BONE
and LITHIC
). The window of observation is
an irregular polygon. Spatial coordinate unit is metres.
Dr. L. Cobo and Prof. F. Diez-\Martin. Please cite Diez-\Martin et al (2021) in any use of these data.
Diez-\Martin, F., Cobo-\Sanchez, L., Baddeley, A., Uribelarrea, D.,
Mabulla, A., Baquedano, E. and \Dominguez-Rodrigo, M. (2021)
Tracing the spatial imprint of Oldowan technological behaviors: A view
from DS (Bed I, Olduvai Gorge, Tanzania).
PLOS ONE, Public Library of Science, 16, 1–47.
DOI: 10.1371/journal.pone.0254603
if(require(spatstat.geom)) {
plot(subset(stonetools, select=TYPE), cex=0.5, cols=2:3)
}
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.