[mmaimcal] FYI: Re: AOS Weather station locations ... DECIDED
awootten
awootten at nrao.edu
Tue Nov 26 09:54:33 EST 2013
Folks,
P413 is the station furthest out the SE arm, near the Jama Road. Its
location is now settled as the array reaches completion.
Clear skies,
Al
Dear Rodrigo, Eduardo, Joaquin
cc: members
After the discussion among Science team members, we agree
to put the weather station close to P413 at the UTM coordinate
x = 634286, y = 7461559
80m south west to the P413 (see attached as a rough sketch.)
If you need further information to continue the installation
work, please let me know.
best regards,
ryu
On 11/25/13 5:24 PM, awootten wrote:
> I agree with your proposal. Thanks, Nick!
>
> Clear skies,
> Al
> On 11/25/13 2:56 PM, Nick Whyborn wrote:
>> Thanks Leonardo!
>>
>> Nick
>>
>>
>> On 25 November 2013 15:30, Leonardo Testi <ltesti at eso.org
>> <mailto:ltesti at eso.org>> wrote:
>>
>> Hi Nick,
>> I support what Al said already. We discussed this on Friday
>> afternoon and we agree that if the new location meets the min
>> distance requirement from the antenna, then it is fine.
>>
>> We concluded that we cannot really propose a sensible location on
>> the ground from several thousand km. We thus support your
>> suggested location.
>>
>> Cheers,
>>
>> Leonardo
>>
>> Sent from my almostPhone
>>
>> On Nov 25, 2013, at 19:24, "Nick Whyborn" <nwhyborn at alma.cl
>> <mailto:nwhyborn at alma.cl>> wrote:
>>
>>> Given that this is sent so late I will extend the deadline to
>>> 1400UT tomorrow to give our EU colleagues time to react.
>>>
>>> Cheers, Nick.
>>>
>>> On Monday, 25 November 2013, Nick Whyborn wrote:
>>>
>>> Hi,
>>>
>>> I spoke with Al on Friday but was not able to reach
>>> Leonardo. However, Al informed me that this was discussed in
>>> their regular coordination meeting and that he does not know
>>> of an objection to siting the weather mast between 60
>>> and 80m SW of P413. Therefore, I am proposing the UTM
>>> coordinates
>>>
>>> x = 634286, y = 7461559
>>>
>>> If anyone objects to this proposal they should do so before
>>> 0000UT on tomorrow Tuesday 26 November. Assuming no one
>>> objects then Ryu will ask NA Site to proceed.
>>>
>>> Cheers, Nick.
>>>
>>> On Tuesday, 19 November 2013, Nick Whyborn wrote:
>>>
>>> ... siting the weather station SW of pad P413 with the
>>> following approximates coords:
>>> x = 634286, y = 7461559
>>>
>>>
>>>
>>>
>>> On 14 November 2013 13:56, Nick Whyborn
>>> <nwhyborn at alma.cl> wrote:
>>>
>>> I spoke with Richard Hills about this.
>>>
>>> The drawing from Rodrigo sent on Nov 7 shows the
>>> weather mast position as requested 2-3 years ago -
>>> it is about E from the pad P413 which is at the end
>>> of the NE arm. The drawing of the AOS showing the
>>> present location of P413 is attached - P413 is in
>>> the top right corner. This link shows the pad in
>>> relation to the track which joins the Paso Jama road
>>> on google maps
>>> <https://maps.google.com/maps?q=-22.951587,-67.691431+%28P413+ALMA+AOS+NE+arm%29&t=h&z=16>.
>>>
>>> Back then Thijs was requesting a gate house on this
>>> track and weather mast was to be sited to provide
>>> CCTV surveillance of the road and gate house.
>>> Anyway, the gate house idea never made it into the
>>> scope so there is no longer any reason that I am
>>> aware of of siting the weather mast there.
>>>
>>> Rodrigo's question is can we move it back to be
>>> closer to the pad P413 where the power and FO cable
>>> is to avoid digging an unnecessarily long 420 m
>>> trench. The only requirement that Richard can think
>>> of for the new location is to maintain a minimum
>>> distance from the antenna to avoid it disturbing the
>>> wind velocity measurement. According to the Vaisala
>>> site ideally the minimum should be the greater of
>>> 150 m or 10 x the height of any obstacles (I wonder
>>> if *any* of our weather stations comply with that
>>> requirement?). Anyway, applying that would site the
>>> mast about 200m from the pad and for access reasons
>>> I would think the best site would be near to the pad
>>> access road (not the new road which I does not exist
>>> on the google image). So any convenient location
>>> roughly 200m from the pad P413 and say 5 - 10 m from
>>> the N-E road would be my suggestion. If Richard or
>>> others indicate a smaller spacing between pad and
>>> weather station is acceptable then that is also fine
>>> by me.
>>>
>>> Does anyone have another suggestion?
>>>
>>> Cheers, Nick.
>>>
>>> On 7 November 2013 09:45, Rodrigo Torres
>>> <rtorres at nrao.cl> wrote:
>>>
>>> Dear Joaquin:
>>>
>>> Yes, that?s the idea, move the weather station
>>> mast MS 413, closer to PAD P413.
>>>
>>> I attached drawing where you see the layout of
>>> trench we should do, more than 420 meters.
>>>
>>> Regards,
>>>
>>> Rodrigo Torres
>>>
>>>
>>> On 11/6/2013 8:17 PM, Joaquin Penroz wrote:
>>>>
>>>> Dear Rodrigo :
>>>>
>>>> Just to clearly understand your request.
>>>>
>>>> What you are asking is, if we can move the
>>>> weather station mast MS413, closer to PAD P413 ?
>>>>
>>>> Please confirm, since all these locations where
>>>> extensively reviewed and finally defined by
>>>>
>>>> Richard Hills last year and I shall ask ALMA
>>>> Science about an eventual location modification.
>>>>
>>>> All the best ...
>>>>
>>>
>>>
>>> --
>>> Dr Nick Whyborn
>>> ALMA Array Lead Engineer
>>
>>
>>
>>
>> --
>> Dr Nick Whyborn
>> ALMA Array Lead Engineer
>
--
Ryusuke Ogasawara, PhD
Project Manager, Joint ALMA Observatory
Alonso de Cordova 3107 Ofc.129, Vitacura, Santiago
TEL:+56 (2) 2467 6132 CEL:+56 9 7767 6591
E-mail: rogasawa @ alma.cl
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listmgr.nrao.edu/pipermail/mmaimcal/attachments/20131126/aeef6b1b/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Tower413New.pdf
Type: application/pdf
Size: 46653 bytes
Desc: not available
URL: <http://listmgr.nrao.edu/pipermail/mmaimcal/attachments/20131126/aeef6b1b/attachment.pdf>
More information about the mmaimcal
mailing list