Subject: [SLR-Mail] No. 1951: Re: No.1943 : Transition to new ILRS data format
From: Krzysztof Snopek <slrmail@dgfi.badw.de>

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SLR Electronic Mail          2011-01-20 10:27:00 UTC           Message No. 1951 
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Author: Krzysztof Snopek
Subject: Re: No.1943 : Transition to new ILRS data format

Dear Carey, dear Randy, dear colleagues,
here are some remarks on data in old and new format.

I have analyzed SLR data I had collected from CDDIS and EDC for last several 
days.
>From CDDIS I get data in old format from:
ftp://cddis.gsfc.nasa.gov/pub/slr/data/npt/
and CRD from:
ftp://cddis.gsfc.nasa.gov/pub/slr/data/npt_crd/

and from EDC:
ftp://edc.dgfi.badw.de/pub/slr/data/npt/
ftp://edc.dgfi.badw.de/pub/slr/data/npt_crd/

Since 20110117 not all stations are present in both npt and crd files. For 
example for lageos1 for 20110117 in old format there are observations from:
Altay, Yarragadee, Haleakala, Koganei, Tanegashim, Concepcion, Zimmerwald, 
Mount Stromlo, Simosato, Potsdam, Grasse, Wettzell

and in crd files there are:
Yarragadee, Haleakala, Koganei, Concepcion, Zimmerwald, Mount Stromlo,   
Simosato, Graz, Potsdam, Grasse, Wettzell

Hence, in CRD are missing: Altay, Tanegashim,
and in old format are missing:  Graz
Similar discrepancies are for other satellites.

Concernig this, I have two questions:
1) Is this discrepancy because the conversion from one format to another is 
done with delay ? 
2) Where the converted data are put ? On EDC I have found two directories:
/pub/slr/data/npt_from_crd/
/pub/slr/data/crd_from_npt/
Will it be the same on CDDIS ? I thought that the directory structure of both 
DCs were the same ?

Best regards
Krzysztof



On Wednesday 22 December 2010 09:41:16 you wrote:
> ***************************************************************************
> ***** SLR Electronic Mail      Wed Dec 22 09:41:06 CET 2010       Message
> No. 1943
> **************************************************************************
> ******
> 
> Author: Randy Ricklefs/ILRS CB
> Subject: Transition to new ILRS data format
> 
> To: Users of ILRS Data
> 
> Dear Colleagues,
> 
> As most of you know, the ILRS have been in the process of transitioning
> from the old data formats, CSTG normal point and Merit II full rate, to
> the new CRD (Consolidated laser Ranging Data) format over the last few
> years. A formal validation process has been used to insure that the CRD
> data sent from the stations matches or surpasses the quality of data in
> the old format. Most of the SLR stations have now successfully passed
> this validation process, and all the SLR analysis groups have or are
> close to finishing their conversion.
> 
> As has been announced earlier, the CRD format will be the operational
> format for all ILRS data distribution as of January 15, 2011. At that
> point, the following will happen.
> 
> 1) All validated stations sending both CRD and old format data in
> parallel should halt transmission of the old format;
> 
> 2) All stations that have not been validated to send CRD data will
> temporarily have their new data converted to the CRD format by the
> Operations Centers (OCs). Stations are still expected to convert to the
> new format as soon as possible, as the old format lacks many of the
> useful capabilities of the new format.
> 
> 3) CRD normal points will continue to be back-converted to the old
> format and distributed in parallel with the CRD normal points for a
> period of 2 months. This will serve as a grace period to allow other
> data users to finish conversion.
> 
> Please feel free to contact me with any questions on the conversion.
> 
> Thank you to all the stations, operations centers, data centers, and
> analysis centers for the long, hard work it took to make this conversion
> a success.
> 
> Best regards,
> Randall Ricklefs
> for the ILRS Data Formats and Procedures Working Group
> and the ILRS Central Bureau
 
-- 
Dr. Krzysztof Snopek

Helmholtz Centre Potsdam
GFZ German Research Centre for Geosciences
Department 1 Geodesy and Remote Sensing
Section 1.2:  Global Geomonitoring and Gravity Field
c/o DLR Oberpfaffenhofen
Muenchner Strasse 20
D-82234 Oberpfaffenhofen

Tel: +49-8153-28-1196
Fax: +49-8153-28-1735
Email: snopek@gfz-potsdam.de

From: slrmail@dgfi.badw.de
From: Krzysztof Snopek <snopek@gfz-potsdam.de> 

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