NRT

1 Dec 2017 installation of IMERG V05B

On 1 December 2017 sometime between 07:00 UTC and 12:00 UTC, PPS will begin installing V05B algorithms for the near realtime (NRT) IMERG dataset. If no problems arise, the installation should take approximately 4 hours. During this period IMERG products will be unavailable.

While this is the first V05 IMERG available from NRT, we are making the data product version V05B so that both the early and the late product will be consistent with the version of the final product which is at V05B.

TDRS 171 in safehold: Increased latency on GPM near-realtime products

One of the TDRS satellites which GPM uses for downloading data is currently in safehold.  This means that all downloads scheduled for that satellite wiil obviously not be able to be met. This will increase the latency of all GPM NRT products.  

One missed pass has already occurred and led to increased latency. Several others will occur during the night and into tomorrow.

June 15 GPM NRT outage: 14:15 UTC to 15:15 UTC

Date of Event:  15 June 2017
Start Time of Event:  13:15 UTC
Schedule stop time:   14:15 UTC

GSFC networking personnel will be replacing network equipment that will directly impact GPM MOC, both its connection to PPS AND, more significantly, its connection to White Sands (WSC) which is the download location for GPM data.

Since this replacement will provided needed increase in network throughput capacity, the update is required.

During the outage, PPS SDPS (tnitta) will receive NO GPM DATA.  

Start of V05A NRT Swath Products

Effective approximately 04:00 UTC, 9 May 2017 the near-realtime swath products (GMI, partner constellation, radar and combined) will be upgraded from V04 to V05. 

During the conversion the latency of near-realtime will be affected as all the new code and support files need to be modified to carry out this upgrade. We hope this will take no more than 2 hours but can not guarantee it might not be longer.

GPM Transitioning its Web-based Global Displays

What:
Google Earth access for near-realtime IMERG and 3B42 KML files will be replaced by an updated service for viewing precipitation data in near-real time on a 3D virtual globe using Cesium (https://cesiumjs.org/).

When:
The current plan is to make the cut-over to the new Cesium-based service on or about October 16, 2016.

Why:
The evolution of network policies and applications prevents continued GPM use of Google Earth.

V04 Processing for GPM Near-Realtime (NRT) is Scheduled to Begin

Late on March 2, 2016, the GPM NRT system will begin using V04 algorithms for:

  • Level 1B GMI
  • Level 1C GMI
  • Level 1 Radar
  • Level 2 Radar
  • Level 2 Combined

V04 is the first version that uses GPM as the calibrator for the constellation rather than TRMM. The GPROF database is built using the combined observations. GMI is extremely well calibrated and the brightness temperatures in 1B and 1C are an important improvement over those in V03.

Large Gap in Near-Realtime Data

Starting at 08:38 UTC PPS stopped getting data from the GPM Mission Operations Center.  Data was resumed at 17:21 UTC.  However, new GPS data was sent before older GPS data. The science data was sent out of order with the GPS data. This meant that about 125 mins of 1B and 1C GMI data had no geolocation and perhaps more after this had questionable geolocation. The same issues obviously also affected the radar and combined NRT which are just missing for the period between 8:30 UTC and 17:30 UTC.

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