specific development discussions on the Cartographic Projections Library (PROJ.4)

John Smart | 9 Dec 2003 17:01

Parsing of " in +lat_0 and +lon_0 arguments

Hello

I was getting strange results from proj, and I think I see why. See this:

proj -I +proj=cass +ellps=airy +lon_0=3d46'47"w +lat_0=55d40'23"n
0 0
3d46'47"W       0dN

proj -I +proj=cass +ellps=airy +lat_0=55d40'23"n +lon_0=3d46'47"w
0 0
0dE     55d40'23"N

proj -I +proj=cass +ellps=airy +lon_0=3d46'47w +lat_0=55d40'23"n
0 0
3d46'47"W       55d40'23"N

It looks like including the " in the first of +lat_0 and +lon_0 throws the
program off.

I can do proj -I now if I remember not to include " in the +lat_0 or +lon_0
arguments but I wonder if this behaviour is not a bug? (Or maybe I'm missing
something blindingly obvious about the syntax?)

John Smart

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Craig Bruce | 9 Dec 2003 18:19

Re: Parsing of " in +lat_0 and +lon_0 arguments

"John Smart" <john.smart <at> caris.com> wrote:

> proj -I +proj=cass +ellps=airy +lon_0=3d46'47"w +lat_0=55d40'23"n
> 0 0
> 3d46'47"W       0dN

The problem you're having isn't with the 'proj' program but with the
shell environment you are using.  The apostrophe and quotation mark are
characters that are interpeted by the shell to have special meaning, and
since you're using both, it's kind of difficult to avoid awkward commands.

You'd need to give something like:

% proj -I +proj=cass +ellps=airy +lon_0=3d46"'"47'"'w +lat_0=55d40"'"23'"'n
0 0
3d46'47"W       55d40'23"N

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Eric Miller | 9 Dec 2003 18:37

Re: Parsing of " in +lat_0 and +lon_0 arguments

Seems to be an artifact of quoting by your shell program. Escape the double quotes
with a backslash (+lon_0=3d46'47\"w).

Eric G. Miller
GIS Analyst
Wildlife and Habitat Data Analysis Branch
Department of Fish and Game

>>> john.smart <at> caris.com 12/09/03 08:01AM >>>
Hello

I was getting strange results from proj, and I think I see why. See this:

proj -I +proj=cass +ellps=airy +lon_0=3d46'47"w +lat_0=55d40'23"n
0 0
3d46'47"W       0dN

proj -I +proj=cass +ellps=airy +lat_0=55d40'23"n +lon_0=3d46'47"w
0 0
0dE     55d40'23"N

proj -I +proj=cass +ellps=airy +lon_0=3d46'47w +lat_0=55d40'23"n
0 0
3d46'47"W       55d40'23"N

It looks like including the " in the first of +lat_0 and +lon_0 throws the
program off.

I can do proj -I now if I remember not to include " in the +lat_0 or +lon_0
arguments but I wonder if this behaviour is not a bug? (Or maybe I'm missing

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headers

Miguel pedro | 13 Dec 2003 16:45

Tranform coordinates

Hello
I have the following problem.

I read coordinates in latitud/longitud using protocol
nmea 0183 and I have the draw using the projection
WGS84,Zone 12 south America.

As I specify in the file .map in Mapserver using the
projection?.

Thank you.

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