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Thank you Frank for helping me with the initial parameters for
testing Spheroids! I am now trying to test Ellipsoidals and I have
a problem with the parameters I am passing proj.4.<br>
<br>
Here are the arguments that I am trying to use:<br>
<blockquote><small>./proj +proj=cea +lon_0=0 +e=0.5 +R_A=1
+ellps=WGS84 -E <<EOF<br>
0 0<br>
EOF</small><br>
</blockquote>
And the resulting output:<br>
<blockquote><small>Rel. 4.7.1, 23 September 2009<br>
<lt-proj>: <br>
projection initialization failure<br>
cause: invalid boolean param argument<br>
program abnormally terminated<br>
</small></blockquote>
Anyone know what I've done incorrectly?<br>
<br>
Thank you for your help.<br>
<br>
On 05/10/11 12:25, Frank Warmerdam wrote:
<blockquote
cite="mid:CA+YzLBf=4hdnGFebQ9qwP7=VC87rj8NL4LUXopOuvgtRVbUuGA@mail.gmail.com"
type="cite">
<pre wrap="">On Tue, Oct 4, 2011 at 4:05 PM, Michael Speth
<a class="moz-txt-link-rfc2396E" href="mailto:spethm@landcareresearch.co.nz"><spethm@landcareresearch.co.nz></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Greetings,
I am a new proj.4 user and I would like to try some simple examples.
I have been reading the user doc as well as the update (proj.4.3.pdf);
however, I have been unsuccessful with executing the examples listed.
---- [ System Information] ----
System: Ubuntu 11.04 64-bit
Kernel: 2.6.38-11-generic
Proj.4 Version: 4.7.0 compiled from tarball
Here are two examples that show my problem:
---- [Example 1] ----
/opt/proj-4.7.0/src$ ./proj +proj=poly +lon_0=-66 +lat_0=40 -v
Rel. 4.7.1, 23 September 2009
<lt-proj>:
projection initialization failure
cause: major axis or radius = 0 or not given
program abnormally terminated
---- [Example 2] -----
/opt/proj-4.7.0/src$ ./proj +proj=poly +lon_0=-60 -E <<EOF
> # sample points
> 65W 43d15N
> -55 37.33
> EOF
Rel. 4.7.1, 23 September 2009
<lt-proj>:
projection initialization failure
cause: major axis or radius = 0 or not given
program abnormally terminated
---------------------------
It seems that I am not providing the radius or major axis. Is this
correct, if so, how do I provide this information?
</pre>
</blockquote>
<pre wrap="">
Michael,
You can specify the earth model several ways, but adding +ellps=WGS84
is a fairly simple way.
eg.
./proj +proj=poly +lon_0=-60 +ellps=WGS84 -E <<EOF
Note that PROJ usually picks up the default ellipsoid from an initialization
file but that doesn't work if you are running proj locally instead of first
installing it. The main thing fetched from the defaults initialization file
is a default ellipsoid.
Best regards,
</pre>
</blockquote>
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