[OSRS-PROJ] Orthographic Projections and MapServer

Bart Adriaanse B at rt.nl
Thu Aug 21 17:44:48 EDT 2003


I don't mean to be sarcastic, excuse me, we have been employing Poj.4
gratefully for a few years, it works fine and we gratefully apreciate the
works of you and Frank and other "guru's" alike...

I take a mailing list like this to be a good place to talk about this kind
of projection related "wishfull thinking", sorry i my suggestions were like
to suggestive, i didn't mean for them to be sarcastic by any means....


----- Original Message ----- 
From: "Gerald I. Evenden" <gerald.evenden at verizon.net>
To: "[OSRS-PROJ]" <osrs-proj at remotesensing.org>
Sent: Thursday, August 21, 2003 11:18 PM
Subject: Re: [OSRS-PROJ] Orthographic Projections and MapServer

> Probably senseless to reply to sarcasm.
> PROJ is a part of a now defunct graphic system called MAPGEN that we
> used several years ago.  It functioned fairly well for large scale
> mapping and would produce accurate mylar overlays for USGS base maps.
> Please note that I said "part of."  The mapping system eventually
> became dated and replaced by commercial products but since my interest
> was basically in the projection part I maintained and expanded the
> the projection system.  Carefully note that the map drafting
> system was always delivered as a two part package: MAPGEN and PROJ.
> As most of you know, PROJ has applications in non-map making activities
> and thus retained its usefulness in spite of the demise of the
> graphic system.
> To say that the PROJ system should make maps is like requiring the
> same activities from sine and tangent procedures.  PROJ is only involved
> in the process of transforming geographic coordinates to Cartesian so
> they can be presented on a flat sheet of paper with suitable graphic
> software (or even hand plotted on graph paper).
> On Thu, 2003-08-21 at 16:12, Bart Adriaanse wrote:
> > Gerald,
> >
> > No flames, just comments, and wishfull thinking...
> >
> > Being a typical user who knows what a projection is and how to work with
> > them, but prefers to use a tool like Proj or the GIS at hand rather then
> > even attempt to do my own this is mostly wishfull thinking i suppose.
> >
> > I can see clearly now there seems to be no simple solution, you opened
> > eyes to realize expecting Proj to deal with this is not realistic, i
> > how would it anticipate on me drawing a polygon or polyline, or maybe
even a
> > transparent globe where points beyond the horizon show through half
> > transparently ;-)
> >
> > I guess you're right...
> >
> > So my comment would boil down to simply the need to be able to find out
> > which points of a polyline processed by pj_forward were over the
> > from what i understand by now i could process the points one by one and
> > assess the return code, right ?
> >
> > Best regards,
> >
> > Bart Adriaanse
> > www.demis.nl
> ...
> -- 
> Gerald I. Evenden <gerald.evenden at verizon.net>
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