| Date: | 2010-01-06 23:50:00 | |
| Sender: | Julie Horvath, NASA SLR <Horvath, Julie E. <Julie.Horvath@Honeywell.com>> | |
| Subject: | [SLR-Mail] No. 1828: 7105 GODL: Greenbelt, MD MET Data Anomaly | |
| Author: | Julie Horvath, NASA SLR | |
| Content: | ******************************************************************************** SLR Electronic Mail 2010-01-06 23:50:00 UTC Message No. 1828 ******************************************************************************** Author: Julie Horvath, NASA SLR Subject: 7105 GODL: Greenbelt, MD MET Data Anomaly Dear Colleagues, HTSI has recently discovered an anomaly with the SLR data taken by the NASA station, MOBLAS-7, located in Greenbelt, MD, due to a recently discovered bug in the software that reads the values of the new Parascientific MET4 sensor. This unit replaced the older MET3 sensor at the station on October 1st, 2009. Engineers found that the sensor values written in the SLR data were compromised when temperatures fell below freezing due to an unexpected shift in the MET4 data format. When the site experienced negative temperatures (< 0 deg C), the temperature values were incorrectly written to the SLR data as 0 deg C or 273.2 deg K. At the same time, the pressure and humidity sensor values were also incorrectly written. Therefore, ILRS analysts should be aware that there may be issues with the quality of the MOBLAS-7 data when the temperature values in the SLR data are at 273.2 K. When the temperature values in the SLR data are above the freezing level, all data is nominal. After a review of the weather in Greenbelt, MD, it appears that temperatures did not drop below freezing until the beginning of December 2009, but all data with temperature values of 273.2 K since October 1st should be viewed as suspect. As of January 6th, 2010 at 11:00 GMT, this software bug has been corrected, and all MET values will be accurate. We are very sorry for any inconvenience that this has caused. Best Regards, Julie Horvath NASA SLR Honeywell Technology Solutions Inc. julie.horvath@honeywell.com From: ”Horvath, Julie E.” ******************************************************************************** |