What have I been telling you!?...
Check out the article mentioned on Maproom
Its something to really think about especially when projects come up that require locating items on the ground with good accuracy. GPS has been awesome since Selective Availability was turned off and the development of differential correction,
Unfortunately many things like the availability of technology, money and time etc come into play and with the advent of google maps/earth/goggle, the expectation of our customers to locate things accurately and quickly has skyrocketed.
I am responsible at work for setting up projects that require GPS to locate a point of reference, usually for legal reasons. The first thing I ask though is can you see it on an aerial.
Aerial photos come with metadata from their supplier stating accuracy (often comparable or better than gps), pixel distance and the time and day it was taken, usually these days with lidar information to simultaneously give you z values as well as x and y. So if you can see it on an aerial.. why use gps.
The term "GPS" carries a lot more clout than "Georeferenced". I'm not saying gps is useless.. Its not!! I'm just emphasising that it has its place and that all options should be considered when project planning.
Its something to really think about especially when projects come up that require locating items on the ground with good accuracy. GPS has been awesome since Selective Availability was turned off and the development of differential correction,
Unfortunately many things like the availability of technology, money and time etc come into play and with the advent of google maps/earth/goggle, the expectation of our customers to locate things accurately and quickly has skyrocketed.
I am responsible at work for setting up projects that require GPS to locate a point of reference, usually for legal reasons. The first thing I ask though is can you see it on an aerial.
Aerial photos come with metadata from their supplier stating accuracy (often comparable or better than gps), pixel distance and the time and day it was taken, usually these days with lidar information to simultaneously give you z values as well as x and y. So if you can see it on an aerial.. why use gps.
The term "GPS" carries a lot more clout than "Georeferenced". I'm not saying gps is useless.. Its not!! I'm just emphasising that it has its place and that all options should be considered when project planning.
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