Home Range and Habitat Use of the New Zealand Falcon (Falco novaeseelandiae) within a Plantation Forest: A Satellite Tracking Study

Table 4

Accuracy and precision¹ (km) by Location Class (LC) from two stationary PTT’s.

	Argos	Transmitter 1^2		Transmitter 2^3
LC^4	Precision (km)	N	Accuracy ± precision (km)	N	Accuracy ± precision (km)
3	± 0.15	588	0.24 ± 0.2	21	0.52 ± 0.2
2	± 0.35	456	0.55 ± 0.8	11	1.06 ± 0.6
1	± 1	385	1.64 ± 2.3	6	1.95 ± 0.9
0	>1	402	48.64 ± 268.2	3	4.22 ± 1.2
A	No accuracy estimation	342	21.93 ± 170.8	5	1.04 ± 0.96
B	No accuracy estimation	366	17.41 ± 28.4	5	39.9 ± 50.26
Z	Invalid location	48	147 ± 397.4	n/a	n/a

¹“Accuracy” (mean) is the offset, or bias, of that mean relative to the true location points, whereas “Precision” (s.d.) is a measure of the tightness of the grouping, being the clustering of points about the mean of those points [15].
²Transmitter one was tested for two and a half years. The “true” location was not known so the mean location was calculated using the set of 588 LC 3 locations (−38.82511, 176.58243). This transmitter had 25 locations removed of LC 3, 2, 1, A, and B. These locations either had incorrect formats or distances from the mean of >400 km indicating impossible speeds and deeming them to be serious outliers.
³Transmitter two was tested for six months.
⁴LC 3, 2, 1, and 0 are available when 4 messages are received per satellite overpass, LC A from 3 messages and LC B from 2 messages. LC Z is considered an invalid location. See methods in text.