articles/Review/gps-page11
GPS – Finding your way to that perfect landscape location - part 11 of 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
by Mike McNamee Published 01/02/2017
GPS Jargon Buster
Global Positioning System. The glue that holds electronic navigation together. A group of 24 satellites are positioned around the Earth, 12,000 miles up. From any position on Earth you can 'see' four satellites and from these your position may be calculated to an accuracy of 3m and your height to an accuracy of 4.5m. Encryption of the signals limits the accuracy to these values; the US military have the ability to decode the signals to deliver 1m spatial and 3m height resolutions.
When a GPS is first used (or after a system crash) start-up can be delayed while the system 'finds' and locks on to the visible satellites (the same occurs if you take your satnav on a plane with you – it takes while to wake up when you get out at the Spanish airport and try to drive away!).
SatNav
This usually refers to in-car navigation systems which can plot a route between the current location and a specified destination, offering alternative routes for speed, distance and even avoiding congested areas.
For the destination and for journey planning it is usual to use either a post code or a 'town/street name/house number' input. All in-car systems provide audible instructions for direction changes.
Auto-routing
The system built in to a satnav or GPS device enabling optimum routes to be suggested. This is usually carried out on a computer using a map and the mouse to pinpoint the start, and finish along with manual control of the way points, where needed. Auto-routing often has algorithms which seek paths and roads for particular reasons such as:
Fastest:
Using fastest and most direct roads.
Shortest:
Minimising the distance travelled avoiding main roads if the distance is shorter on minor roads.
Please Note:
There is more than one page for this Article.
You are currently on page 11
- GPS – Finding your way to that perfect landscape location page 1
- GPS – Finding your way to that perfect landscape location page 2
- GPS – Finding your way to that perfect landscape location page 3
- GPS – Finding your way to that perfect landscape location page 4
- GPS – Finding your way to that perfect landscape location page 5
- GPS – Finding your way to that perfect landscape location page 6
- GPS – Finding your way to that perfect landscape location page 7
- GPS – Finding your way to that perfect landscape location page 8
- GPS – Finding your way to that perfect landscape location page 9
- GPS – Finding your way to that perfect landscape location page 10
- GPS – Finding your way to that perfect landscape location page 11
- GPS – Finding your way to that perfect landscape location page 12
- GPS – Finding your way to that perfect landscape location page 13
- GPS – Finding your way to that perfect landscape location page 14
- GPS – Finding your way to that perfect landscape location page 15
- GPS – Finding your way to that perfect landscape location page 16
1st Published 01/02/2017
last update 21/07/2022 08:49:43
More Review Articles
The Society of Photographers Convention and Trade Show at The Novotel London West, Hammersmith ...
You have 197 days until The Society of Photographers Convention Wednesday 15th January 2025
