[OZAPRS] UI-VIEW Map Specification?

[Chris Hill]

Hi Carl,

I think you might be confusing/intermingling datum and projection.

Although I can't find any definitive reference, I am working on the basis
that UI-VIEW requires:

  o Datum = WGS84
  o Projection = Cylindrical

I may not have the luxury of obtaining the shape files, but rather will be
(hopefully) provided with raster images (.png?), as per my specification,
complete with the copyright notice and details of the conditions of use
(ie,
"for amateur radio use only").

If someone can point me to a credible technical specification for APRS
maps,
I'll read it!

A useful reference on spheroids, datums and projections is:
www.cof.orst.edu/cof/teach/for420/Powerpoint_lectures/projections.ppt
(Slide 22 shows the result of right datum, wrong projection)

An idea of the information that is required to meaningfully describe a
map,
is conveyed by the Metadata requirements of the WA Land Information System
(WALIS) Metadata Policy:
http://www.walis.wa.gov.au/walis/content/metadata.html
This is a bit more comprehensive than typically found in the .inf files
typically distributed!  (Admittedly, a bit more work, too!)


We can aspire...



73 Chris vk6kch






-----Original Message-----
From: ozaprs-bounces at marconi.ics.mq.edu.au
[mailto:ozaprs-bounces at marconi.ics.mq.edu.au]On Behalf Of Carl Makin
Sent: Sunday, 7 March 2004 8:09 PM
To: ozaprs at marconi.ics.mq.edu.au
Subject: Re: [OZAPRS] UI-VIEW Map Specification?


Evening All,

On 07/03/2004, at 10:37 PM, Chris Hill wrote:

> As far as I can make out, UI-VIEW uses a cylindrical projection,
> therefore
> I'm going to request maps that are cylindrical projections against the
> WGS84
.
.
> It's a pity that UI-VIEW doesn't support common projections.

Unlike other software like Xastir.

Wouldn't it be better to get the maps in WGS84 format, process them
into cylindrical view and then store both?  That way if UI-View moves
to a more realistic projection then you'll have undistorted maps to
work from and other programs can take advantage of the repository?


Carl.
(vk1kcm)

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