Georeferencing parameters and transformations explained#2501
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To the introduction, subsections are added describing map coordinates, geographic coordinates and datum, reference point, orientation, and scale. These are all made more concise by deferring any mention of the CRS, convergence, grivation, etc. The Georeferencing dialog section is simplified a little due to having explanations of terms moved to the introductory sections. The details of georeferencing calculation in this version gloss over the need for a CRS and the added complexity of compensating for the projected grid. The plan is to flesh out the missing details and move the section to after the CRS is introduced.
The calculation of latitude and longitude from map coordinates had been described loosely, without reference to the CRS. This is now refined to mention grivation and combined scale factor. It is moved to follow the description of CRS. The subsection covering calculation of real world size from map size is removed, subsumed as part of the precise calculation of latitude and longitude. A few fixes to the wording are included.
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Here is HTML resulting from commit 495c8ce, in case that helps people review the additions. |
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@pkturner, thank you very much for your thorough rework of this help page. |
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@dl3sdo |
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I moved the changes and PR to mapper-manual. |
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As requested in comments on #2190 and #2499, this adds to the Georeferencing help page. It describes the parameters, coordinate systems, and transformations between coordinates independent of the Georeferencing dialog.