Projection Dialogs
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There are two main projection dialogs used in SMS, GMS< and WMS: The Display Projection dialog, and the Object Projection dialog. From each of these, the Select Projection dialog can be accessed. More detailed information about each projection and the information in these dialogs can be found in the Projections article.
Display Projection Dialog
File:DisplayProjection.jpg
Example of the Display Projection dialog.
Horizontal section
The Horizontal section of the dialog has two options available via radio buttons:
- No projection - This option doesn't set a projection, and only allows adjusting the horizontal Units used in the project. The available units include:
- U. S. Survey Feet. To quote Wikipedia: "The United States survey foot is defined as exactly 1200⁄3937 meters, approximately 0.3048006096 meters."[1]
- International Feet. This is defined as exactly 0.3048 meters.[2]
- Meters. "The metre is the length of the path travelled by light in vacuum during a time interval of 1/299792458 of a second."[3]
- Inches
- Centimeters
- Global projection - Clicking on the Set Projection button allows more specific projections to be set. These are listed below in the Select Projection Dialog section.
Vertical section
Object Projection Dialog
Select Projection Dialog
References
- ^ A. V. Astin & H. Arnold Karo, (1959), Refinement of values for the yard and the pound, Washington DC: National Bureau of Standards, republished on National Geodetic Survey web site and the Federal Register (Doc. 59-5442, Filed, June 30, 1959, 8:45 am)
- ^ "On what basis is one inch exactly equal to 25.4 mm? Has the imperial inch been adjusted to give this exact fit and if so when?". National Physical Laboratory. http://www.npl.co.uk/reference/faqs/on-what-basis-is-one-inch-exactly-equal-to-25.4-mm-has-the-imperial-inch-been-adjusted-to-give-this-exact-fit-and-if-so-when-(faq-length). Retrieved on July 24, 2012.
- ^ "17th Conférence Générale des Poids et Mesures (CGPM) - Resolution 1 of the CGPM (1983): Definition of the metre". Bureau international des poids et mesures (BIPM). http://www.bipm.org/en/CGPM/db/17/1/. Retrieved on 2012-09-19.
Projections | |
|---|---|
| UTM: | Africa • Asia • Australia • Europe • North America • South America |
| State Plane: | Alaska • Hawaii • Mideast • Midwest • New England • Northwest • South Central • Southeast • Southwest • Virginia Area |
| Other | CPP • Geographic |
