Global Positioning System (GPS) location accuracy improvement due to Selective Availability removal

Adrados, Christophe; Girard, Irène; Gendner, Jean‐Paul; Janeau, Georges

doi:10.1016/s1631-0691(02)01414-2

Cited by 79 publications

(43 citation statements)

References 3 publications

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“…Global positioning system accuracy has improved since removal of selective availability by the United States Department of Defense (Adrados et al 2002). However, inherent biases in fix-rate success and location accuracy may include environmental factors such as forest structure, topography (Gamo et al 2000) and animal behavior (bedding, foraging, etc.…”

Section: Methodsmentioning

confidence: 99%

Home range and habitat selection of an insular fallow deer (Dama dama L.) population on Little St. Simons Island, Georgia, USA

et al. 2009

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A better understanding of habitat use and home range size for an exotic fallow deer (Dama dama L.) population in coastal Georgia is needed to understand the relationship between this introduced species and the barrier island ecosystem. These spatial requirements will aid in management decisions to limit negative impacts to the deer or sensitive habitats. We describe annual and seasonal home range and habitat use of seven fallow deer fitted with GPS collars. Home ranges of females averaged 130.3±0.45 ha based on a 95% local convex hull (LoCoH) nonparametric kernel method. Home ranges of adult males were highly variable, ranging from 56.9 to 354.8 ha. We examined site fidelity by analyzing shifts in core areas and percent overlap across seasons. Only one individual exhibited a seasonal range shift; all other deer demonstrated a high level of site fidelity. Based on compositional analysis of habitat use versus availability, fallow deer avoided salt marshes but showed individual variation in selection of other habitats. Maritime shrub was the most commonly preferred habitat type on the barrier island. Fallow deer have adapted to effectively use available habitats on the barrier island and have successfully excluded native whitetailed deer from recolonizing LSSI.

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Section: Methodsmentioning

confidence: 99%

Home range and habitat selection of an insular fallow deer (Dama dama L.) population on Little St. Simons Island, Georgia, USA

et al. 2009

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“…Therefore, debates were raised on benefits and usefulness of extension-related applications of GIS-GPS-RS technologies and how to increase our knowledge and understanding of these new technologies. Examples and recommendations are taken from the literature and from the researches' own experience [10,11].…”

Section: Figure 1 An Example Of Gis Outcomementioning

confidence: 99%

A Precise Methodology Integrates Low-Cost GPS Data and GIS for Monitoring Groundwater Quality Parameters in Majmaah Region, KSA

Ahmed

Azmi

2014

IJEMA

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GIS/GPS mapping technology provides a very cost effective method of meeting the guidelines and calculating the total information required for decision makers. This paper aims to integrate Geographic Information System (GIS) and data acquired using low-cost GPS in one system and develop a precise methodology that is reliable for environmental studies at Majmaah region. The research focuses on monitoring and mapping the groundwater quality parameters at the study area. Portable GPS instrument with reasonable accuracy was used to measure the coordinates of non-defined water wells in the form of the latitudes and longitudes. A methodology for using these data to locate those positions accurately and merge them in GIS system was developed. The system was developed mainly for environmental studies (characterization of groundwater quality parameters) using a satellite image and the calculated GPS data aiming to produce a dynamic system that is capable of map the changes in any groundwater parameter on different times. However, other uses could be: defining the contaminated soil zones, and the same for flooding areas, as GIS will help in selecting the most appropriate locations to dig new wells, construct dams or produce sensitivity environmental maps for the study area. The resulted contour environmental maps can be helpful to illustrate a clear picture and quantities of needed areas for preservation. The system can be updated and modified easily and remains useful and helpful for supporting the decision making to identify, monitor and plan other environmental studies at the region.

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“…Even with the removal of Selective Availability in 2000, post-processing of the collar files increases the accuracy of the latitudinal and longitudinal location fixes generated by the GPS collars (Adrados et al 2002;Coyne et al 2003). Post-differential correction is a process using data collected from a nearby continuously operating reference station (CORS) covering the same time interval as the GPS collar study.…”

Section: Calculationsmentioning

confidence: 99%

Use of global positioning system collars to monitor spatial-temporal movements of co-grazing goats and sheep and their common guardian dog

Gipson

Sahlu

Villaquiran

et al. 2012

Journal of Applied Animal Research

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Goats and sheep often graze together and guardian dogs are commonly used for protection from predators. The objective of this experiment was to characterise how goats, sheep and guardian dogs interact spatially when grazing the same pasture by use of global positioning system (GPS) collars as an unobtrusive means of behaviour monitoring. In 2002 and 2003, three meat goats and two sheep in a group of 12 of each species were randomly chosen and, along with a guard dog, fitted with GPS collars. Minimum distance travelled between consecutive 30-min fixes and distance between any two animals at the same fix time were calculated using spherical geometry. In 2002, the dog travelled the least between fixes during the day but more at night than either goats or sheep. However, in 2003, there was not a significant species difference in distance travelled in 24 h or during the day or night. All species travelled significantly more during day than night but none were stationary at night. Distance amongst goats and between sheep tended to be greater during day than night; distance between goats and sheep was greater than the distance amongst goats or between sheep. Hence, goats and sheep interacted as two separate entities rather than as one large herd/flock. Distance between the dog and goats was closer than between the dog and sheep, indicating a clear preference of the dog for goats that could relate to a difference in previous exposure to the two species. In summary, based on these findings protection by a guardian dog would be greater for a small group of goats than sheep and much greater than for a mixed species group. Or, with a large group of grazing animals, the number of dogs required for a certain level of protection would rank goats B sheep B mixture of goats and sheep.

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Global Positioning System (GPS) location accuracy improvement due to Selective Availability removal

Cited by 79 publications

References 3 publications

Home range and habitat selection of an insular fallow deer (Dama dama L.) population on Little St. Simons Island, Georgia, USA

Home range and habitat selection of an insular fallow deer (Dama dama L.) population on Little St. Simons Island, Georgia, USA

A Precise Methodology Integrates Low-Cost GPS Data and GIS for Monitoring Groundwater Quality Parameters in Majmaah Region, KSA

Use of global positioning system collars to monitor spatial-temporal movements of co-grazing goats and sheep and their common guardian dog

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