<HTML dir=ltr><HEAD><TITLE>[Proj] Re: Proj Digest, Vol 52, Issue 17</TITLE>
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<DIV dir=ltr><FONT face="Times New Roman" color=#000000 size=2>I'll agree with that 100% without further suggestion.</FONT></DIV>
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<DIV><FONT face="Times New Roman" size=2>Clifford J. Mugnier, C.P., C.M.S.<BR>Past National Director (2006-2008),<BR>Photogrammetric Applications Division<BR>American Society for Photogrammetry and Remote Sensing <BR>and <BR>Chief of Geodesy,<BR>CENTER FOR GEOINFORMATICS <BR>Department of Civil Engineering <BR>Patrick F. Taylor Hall 3223A<BR>LOUISIANA STATE UNIVERSITY <BR>Baton Rouge, LA 70803<BR>Voice and Facsimile: (225) 578-8536 [Academic] <BR>Voice and Facsimile: (225) 578-4474 [Research] <BR>Honorary Life Member of the <BR>Louisiana Society of Professional Surveyors <BR>Member Emeritus of the ASPRS <BR><FONT size=3><STRONG>Member of the Americas Petroleum Survey Group - (Part of "EPSG")</STRONG><BR></FONT>======================================================<BR></FONT><A href="https://email.lsu.edu/exchweb/bin/redir.asp?URL=https://email.lsu.edu/exchweb/bin/redir.asp?URL=https://email.lsu.edu/exchweb/bin/redir.asp?URL=https://email.lsu.edu/exchweb/bin/redir.asp?URL=https://email.lsu.edu/exchweb/bin/redir.asp?URL=https://email.lsu.edu/exchweb/bin/redir.asp?URL=https://email.lsu.edu/exchweb/bin/redir.asp?URL=https://email.lsu.edu/exchweb/bin/redir.asp?URL=https://email.lsu.edu/exchweb/bin/redir.asp?URL=https://email.lsu.edu/exchweb/bin/redir.asp?URL=https://email.lsu.edu/exchweb/bin/redir.asp?URL=https://email.lsu.edu/exchweb/bin/redir.asp?URL=https://email.lsu.edu/exchweb/bin/redir.asp?URL=https://email.lsu.edu/exchweb/bin/redir.asp?URL=https://email.lsu.edu/exchweb/bin/redir.asp?URL=https://email.lsu.edu/exchweb/bin/redir.asp?URL=https://email.lsu.edu/exchweb/bin/redir.asp?URL=https://email.lsu.edu/exchweb/bin/redir.asp?URL=https://email.lsu.edu/exchweb/bin/redir.asp?URL=https://email.lsu.edu/exchweb/bin/redir.asp?URL=https://email.lsu.edu/exchweb/bin/redir.asp?URL=https://email.lsu.edu/exchweb/bin/redir.asp?URL=https://email.ls" target=_blank><FONT face="Times New Roman" size=2>http://www.asprs.org/resources/GRIDS/</FONT></A><BR><FONT face="Times New Roman" size=2>======================================================</FONT></DIV></DIV></DIV>
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<FONT face=Tahoma size=2><B>From:</B> proj-bounces@lists.maptools.org on behalf of Jay Hollingsworth<BR><B>Sent:</B> Fri 12-Sep-08 15:57<BR><B>To:</B> proj@lists.maptools.org<BR><B>Subject:</B> [Proj] Re: Proj Digest, Vol 52, Issue 17<BR></FONT><BR></DIV>
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<P><FONT size=2>At the risk of opening a floodgate of alternate<BR>suggestions, the EPSG is the source of the<BR>projection parameters and they have several<BR>Guidance notes at<BR><A href="http://www.epsg.org/guides/index.html">http://www.epsg.org/guides/index.html</A>, including<BR>something for a more general audience (Guidance<BR>Note 1) as well as more-detailed notes on the<BR>transformation and projection equations and special problems.<BR><BR>I know these aren't proj-specific, but they have<BR>a lot of content to help decide what to use.<BR><BR><BR>Jay<BR><BR>At 11:01 AM 9/11/2008, you wrote:<BR>>----------------------------------------------------------------------<BR>><BR>>Message: 1<BR>>Date: Thu, 11 Sep 2008 11:17:06 -0400<BR>>From: "Gerald I. Evenden" <geraldi.evenden@gmail.com><BR>>Subject: Re: [Proj] Some need for updated proj-4 manuals<BR>>To: "PROJ.4 and general Projections Discussions"<BR>> <proj@lists.maptools.org><BR>>Message-ID: <200809111117.06551.geraldi.evenden@gmail.com><BR>>Content-Type: text/plain; charset="iso-8859-1"<BR>><BR>>On Thursday 11 September 2008 8:10:32 am support.mn@elisanet.fi wrote:<BR>> > Hello,<BR>> ><BR>> > the proj-4 manuals might need some updating and cleaning?<BR>> > There are basicly two groups whcih need them.<BR>><BR>>Between answering all the emails I sometime work on the manual .<BR>><BR>>Have you looked at the libproj4 manual.pdf on:<BR>><BR>><A href="http://members.verizon.net/~gerald.evenden/proj4/">http://members.verizon.net/~gerald.evenden/proj4/</A><BR>><BR>>It is 123 pages but getting a bit old. The<BR>>version in my machine is up to 128<BR>>pages plus corrections and I am working on an improved TM section which will<BR>>add 7 or 8 pages. The sections on cylindricals and pseudocylindricals are<BR>>fairly complete. Most work is needed on conic. Miscellaneous is fairly<BR>>complete. The math for all projections is given so one can see how the<BR>>various options relate to the computations. Internal library procedures are<BR>>fairly complete.<BR>><BR>>The above manual does not cover lproj options (-x etc.) but they are almost<BR>>identical to older documentation of proj.<BR>><BR>>I would like some detailed illustrations related to things like local grid<BR>>systems but at the moment I do not have sufficiently detailed coastline file<BR>>to do them.<BR>><BR>>My manuals do not do datums.<BR>><BR>> > A) Programmers that utilise the library. More or less programming<BR>> > related matters and details. This could be the "Proj-4 Programmer's<BR>> > Manual".<BR>> ><BR>> > B) End users that use the projections. They need information what<BR>> > can be done. What is available and what are the exact parameters<BR>> > and how to use them in each projection and datum available.<BR>> > Exmples are most informative. This might be something like<BR>> > "Proj-4 End Userīs Manual". These people are mostly not interrested<BR>> > of the programming details and those matter should be put in the<BR>> > first manual. Then there is also the end applicationīs "User Manual",<BR>> > which tells more about the application and how to use it.<BR>> > That would be the third manual, written by the proj-4-application<BR>> > makers. Maybe the proj-4 part would be an appendix in this<BR>> > manual?<BR>><BR>>I do not need to take my shoes off to count the<BR>>projections that are difficult<BR>>to use---omerc is a good example of a stinker. Also, I cannot over emphasize<BR>>the use of the -V option with [l]proj where one can experiment with the<BR>>options and where the output will also tell the user if an option is<BR>>specified and not used by the projection.<BR>><BR>> > So the "Proj-4 End User Manual" goes to the end user, if the<BR>> > proj-4 definition is directly visible for the end user... sometimes<BR>> > not, if there is a layer above proj-4.<BR>> ><BR>> > Now the situation is so that there are several proj-4 manuals in<BR>> > pdf format and it is hard to find any specific information especially<BR>> > about "how to use the projections and datums" since the<BR>> > information is here and there. At least one would expect to<BR>> > find all projections and their usage (and datums) in one manual .<BR>> ><BR>> > And of course to keep those 2 manuals up to date to the latest<BR>> > program versions. Manuals might have same versions as<BR>> > programs so that everything would be documented.<BR>> ><BR>> > The end application manuals and documentations keep us so<BR>> > busy that any help with the projections and datums would be<BR>> > highly respected. BTW: Our application can only use those<BR>> > projections that have both forward and inverese projections.<BR>> > So it would be nice if those projections with missing inverese<BR>> > projection would be separated somehow in itīs own group.<BR>> ><BR>> > Etc. etc.<BR>> ><BR>> > Any ideas? Somebody might want to collect and compose<BR>> > those two proj-4 manuals using the pdf originals that are<BR>> > somewhere? Anyway that is what we would very much need.<BR>> ><BR>> > We might hide all the projection and datum complexity in some<BR>> > applications (ready made maps), but sometimes they are visible.<BR>><BR>>To be sure. there are different interest and capability levels that manuals<BR>>address. However, my only intererst is to provide documentation that is as<BR>>complete as possible but also, in the interests of brevity, assumes that the<BR>>reader has sufficient background and related skill to understand that<BR>>material and how to properly apply it. It is not an elementary how-to<BR>>manual.<BR>><BR>>Please, please, please. Anyone finding errors in the previously reference<BR>>manual please notify this group. Thank-you.<BR>><BR>>--<BR>>The whole religious complexion of the modern world is due<BR>>to the absence from Jerusalem of a lunatic asylum.<BR>>-- Havelock Ellis (1859-1939) British psychologist<BR>><BR><BR><BR>Jay Hollingsworth<BR><BR>Seabed Portfolio Manager and<BR>Principal Data Architect<BR>Schlumberger Information Solutions<BR>phone: 713 513 8854 fax: 713 513 2093<BR><BR><BR>_______________________________________________<BR>Proj mailing list<BR>Proj@lists.maptools.org<BR><A href="http://lists.maptools.org/mailman/listinfo/proj">http://lists.maptools.org/mailman/listinfo/proj</A><BR></FONT></P></DIV></BODY></HTML>