[Proj] ITRF96/UTM 36N conversion
Gerald I. Evenden
geraldi.evenden at gmail.com
Fri Aug 7 07:41:01 PDT 2009
On Friday 07 August 2009 10:07:19 am fernandohoze wrote:
> Hello,
>
> I would like to convert coordinates in ITRF96 / UTM-36N format (measured
> with DGPS) to latitude and longitude values that I can use with Google
> Maps. I tried to do the conversion using proj but I couldn't do it. What
> command should I use for this?
>
> This is what my coordinates file looks like:
>
> 2 4415699.244828 482321.027219 950.950000 5 | 2 | 1.400
> 3 4415697.320372 482321.307750 951.050000 5 | 2 | 1.400
> 4 4415696.356924 482321.975236 951.050000 4 | 2 | 1.000
>
> This is what I want:
>
> 2 39.8911748 32.7932165
> 3 39.8911574 32.7932198
> 4 39.8911488 32.7932277
>
> I also would like to find the distance (in meters) between two points whose
> ITRF96 / UTM-36N coordinates are known. I googled it but I didn't find
> anything about it. Can you please help me with this?
>
> Thanks.
Using the script:
#!/bin/bash
lproj +proj=utm +ellps=WGS84 +lon_0=-39.1 -I -r -f %.7f <<EOF
4415699.244828 482321.027219 950.950000 5 | 2 | 1.400
4415697.320372 482321.307750 951.050000 5 | 2 | 1.400
4415696.356924 482321.975236
EOF
This is what I get:
-39.2067835 39.8911747 950.950000 5 | 2 | 1.400
-39.2067802 39.8911573 951.050000 5 | 2 | 1.400
-39.2067723 39.8911487
Note: the true CM gets automatically set in this case to 39W. Note that the
program had to be told that the x-y input was in reverse order (-r option).
I also had to guess that the longitude you gave was west as the output would
not have agreed.
The longitude seems to agree reasonably well but the latitude is real strange!
--
The whole religious complexion of the modern world is due
to the absence from Jerusalem of a lunatic asylum.
-- Havelock Ellis (1859-1939) British psychologist
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