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A New Reference System
Unquestionably,
more and more GPS users will be dissatisfied with the limitations of NAD83 and will
require a coordinate system comparable to ITRF. -Wendy Woodbury Straight, L.S. |
In the years between 1927 and 1983, advances in
positioning and navigation technology resulted in an overall adjustment of the North
American Datum. Major advances have again occurred, but this time over the course of one
short decade. Read Full Article
Take the Trivia Challenge! Answers at bottom of page
1. What do you call a line of constant azimuth (direction) on a map?
2. On what projection are rhumb lines always straight?
3. On what projection are great circle arcs always straight lines?
Been Surfing on the Web?
Have you found some great Web GIS sites? We are
looking for new sites to link on our Resources Page.
We're especially interested in other Cartographic/CAD/GIS newsletters and
publications. Send your suggestions to Ann at ann@.
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Software's Products. Send us your GIS Tips, or Ask Norm a question. |
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| Trivia
Answers:
1. A rhumb line; or for those with expensive taste, a loxodrome.
2. Mercator, one of the reasons this projection is so popular for navigational
purposes!
3. The Gnomonic, this feature is considered by many to be the only useful feature
of this projection. |
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Letter from Norm
-Year 2000- Is it really a problem?
Freebie of the Month
-Area Code Finder
GIS Tips
-If the Earth is not a sphere, and it is not precisely an
ellipsoid, what the heck is it?
Ask Norm?
"Is it possible to define a coordinate system that will convert
coordinates between a local plant (company) coordinate system and a state plane
system?"
GIS Resources
-New! Links
Products
Attention Registered Users!
Do you have the latest release?
Download the update.exe file.
-Tralaine 4.16
10/1/98New!
-Multric 14.04 8/10/98
-Hawkeye 14.14 9/29/98New!
-TralaineDLL 8.01 08/0198 |
