Projection Dialogs: Difference between revisions

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The Horizontal section of the dialog has two options available via radio buttons:
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:
*'''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 {{frac|1200|3937}}&nbsp;meters, approximately 0.3048006096 meters."<ref>A. V. Astin & H. Arnold Karo, (1959), [http://www.ngs.noaa.gov/PUBS_LIB/FedRegister/FRdoc59-5442.pdf ''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&nbsp;am)</ref>
**'''U. S. Survey Feet'''. To quote Wikipedia: "The United States survey foot is defined as exactly {{frac|1200|3937}}&nbsp;meters, approximately 0.3048006096 meters."<ref>{{cite web|url=http://www.ngs.noaa.gov/PUBS_LIB/FedRegister/FRdoc59-5442.pdf|title=Refinement of values for the yard and the pound|publisher=National Bureau of Standards, republished on  National Geodetic Survey web site and the Federal Register|date=June 30, 1959|format=PDF|note=Doc. 59-5442, Filed, , 8:45&nbsp;am|location=Washington, D.C.|first1=A. V.|last1=Astin|first2=H. Arnold|last2=Karo}}</ref>
**'''International Feet'''. This is defined as exactly 0.3048 meters.<ref>{{cite web|url = 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)|publisher = [[National Physical Laboratory (United Kingdom)|National Physical Laboratory]]|title = 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?|accessdate =July 24, 2012}}</ref>
**'''International Feet'''. This is defined as exactly 0.3048 meters.<ref>{{cite web|url = 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)|publisher = National Physical Laboratory (United Kingdom)|title = 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?|accessdate =July 24, 2012}}</ref>
**'''Meters'''. "The metre is the length of the path travelled by light in vacuum during a time interval of 1/299792458 of a second."<ref name="Res1">{{cite web |url=http://www.bipm.org/en/CGPM/db/17/1/ |title=17th Conférence Générale des Poids et Mesures (CGPM) - Resolution 1 of the CGPM (1983): Definition of the metre |publisher=[[Bureau international des poids et mesures]] (BIPM) |accessdate=2012-09-19}}</ref>
**'''Meters'''. "The metre is the length of the path travelled by light in vacuum during a time interval of {{frac|1|299792458}} of a second."<ref name="Res1">{{cite web |url=http://www.bipm.org/en/CGPM/db/17/1/ |title=17th Conférence Générale des Poids et Mesures (CGPM) - Resolution 1 of the CGPM (1983): Definition of the metre |publisher=Bureau international des poids et mesures (BIPM) |accessdate=2012-09-19}}</ref>
**'''Inches'''
**'''Inches'''. An inch is defined as {{frac|1|39.37}} of a meter.
**'''Centimeters'''
**'''Centimeters'''. A centimeter is defined as {{frac|1|100}} of a meter.
*'''Global projection''' - Clicking on the Set Projection button allows more specific projections to be set. These are listed below in the [[#Select Projection Dialog|Select Projection Dialog]] section.
*'''Global projection''' - Clicking on the Set Projection button allows more specific projections to be set. These are listed below in the [[#Select Projection Dialog|Select Projection Dialog]] section.


===Vertical section===
===Vertical section===
 
The Vertical section has two drop-down boxes:
*'''Projection''', giving the following options:
**'''Local'''
*'''Units''', giving the following options:
**'''U. S. Survey Feet'''
**'''International Feet'''
**'''Meters'''
**'''Inches'''
**'''Centimeters'''


==Object Projection Dialog==
==Object Projection Dialog==

Revision as of 21:32, 28 August 2015

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. An inch is defined as 1⁄39.37 of a meter.
    • Centimeters. A centimeter is defined as 1⁄100 of a meter.
  • 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

The Vertical section has two drop-down boxes:

  • Projection, giving the following options:
    • Local
  • Units, giving the following options:
    • U. S. Survey Feet
    • International Feet
    • Meters
    • Inches
    • Centimeters

Object Projection Dialog

Select Projection Dialog

References

  1. ^ Astin, A. V.; Karo, H. Arnold (June 30, 1959). "Refinement of values for the yard and the pound" (PDF). Washington, D.C.: National Bureau of Standards, republished on National Geodetic Survey web site and the Federal Register. http://www.ngs.noaa.gov/PUBS_LIB/FedRegister/FRdoc59-5442.pdf. 
  2. ^ "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 (United Kingdom). 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. 
  3. ^ "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. 


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