[Bldg-sim] Sometimes things are easier than they seem re: merging raw data from two weather stations
Mayer, Stephen
Stephen.Mayer at mwgroup.net
Tue Sep 8 07:48:18 PDT 2015
Joe,
I believe the reason for the two files is that there are two weather stations.
As you shared, the files have the following file name and location:
File Name GPS Coordinates
2014 NM_SOCORRO-MUNI-AP 723620 93040 34.067 -106.900
2014 NM_SOCORRO-MUNI 723620 99999 34.022 -106.903
Just putting them quickly in Google Maps (see image below), the one is the center of town and the other is the airport (about 3.5 miles apart).
Therefore it would make sense that these are two separate stations.
[cid:image006.jpg at 01D0EA23.DDD58FA0]
This being said, the two stations should have similar data and therefore combining them into one file shouldn’t affect the model that much.
Best Regards,
Stephen Mayer, EIT, LEED AP BD+C
Mechanical Discipline
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From: Jones, Christopher [mailto:Christopher.r.Jones at wspgroup.com]
Sent: Friday, September 04, 2015 5:23 PM
To: 'Jim Dirkes'; Joe Huang
Cc: BLDG-SIM
Subject: Re: [Bldg-sim] Sometimes things are easier than they seem re: merging raw data from two weather stations
Joe’s the greatest!
[cid:image003.png at 01D09C46.E75BA0D0]
Christopher Jones, P.Eng.
Senior Engineer
WSP Canada Inc.
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From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Jim Dirkes
Sent: Friday, September 04, 2015 4:31 PM
To: Joe Huang
Cc: BLDG-SIM
Subject: Re: [Bldg-sim] Sometimes things are easier than they seem re: merging raw data from two weather stations
Joe,
You're solving problems that most of the world has never even thought about. Good work.
On Fri, Sep 4, 2015 at 4:24 PM, Joe Huang <yjhuang at whiteboxtechnologies.com<mailto:yjhuang at whiteboxtechnologies.com>> wrote:
I've just had a mini "Eureka" moment that I wanted to share.
As I've been processing more weather data from the ISD, I've been countering more cases for smaller locations (mostly in the US) where there are two weather stations where the WMO numbers are the same for the first part but not for the smaller part. For example, for Socorro New Mexico there are two files:
2014 NM_SOCORRO-MUNI-AP 723620 93040
2014 NM_SOCORRO-MUNI 723620 99999
I generally interpret these cases as where a station may be switching their instrumentation. However, in this case the two stations seem to be reporting at alternating times (table below shows the number of observations by month for the 4 key climate parameters that I need):
NM_SOCORRO-MUNI-AP 723620 34.067 -106.900 1485 4 -7.0 NAM BSk
2014 dbt 464 302 151 538 697 155 0* 0* 511 710 244 0* 419
2014 dpt 462 297 148 535 696 154 0* 0* 505 710 244 0* 416
2014 cld 451 245 108* 477 646 153 0* 0* 413 652 217 0* 373
2014 wsp 464 302 151 538 697 155 0* 0* 510 710 244 0* 419
2014 all 1841 1146 558 2088 2736 617 0 0 1939 2782 949 0
NM_SOCORRO-MUNI 723620 34.022 -106.903 1485 4 -7.0 NAM BSk
2014 dbt 259 389 610 161 41* 549 689 698 224 0* 444 684 431
2014 dpt 256 385 607 159 38* 545 687 698 224 0* 443 684 429
2014 cld 259 312 550 144 41* 549 598 583 182 0* 435 625 388
2014 wsp 259 389 610 161 41* 549 689 698 224 0* 444 683 431
2014 all 1033 1475 2377 625 161 2192 2663 2677 854 0 1766 2676
I have software to merge data from two files but only at defined switchover dates, so this situation seemed at first quite hard to tackle.
Then, I thought, why not just take concatenate the two raw data files, and then sort the combined file to get the data in the right
chronological order? That took me just a few seconds, and voila' , out comes a full weather file with quite high data completeness:
NM_SOCORRO-MUNI-AP2 723620 34.067 -106.900 1485 4 -7.0 NAM BSk
2014 dbt 713 643 714 690 710 690 689 698 688 710 687 691 693
2014 dpt 713 643 714 690 710 690 687 698 688 710 687 690 693
2014 cld 700 531 635 613 671 688 598 583 565 652 651 625 626
2014 wsp 713 643 714 690 710 690 689 698 687 710 687 690 693
2014 all 2839 2460 2777 2683 2801 2758 2663 2677 2628 2782 2712 2696
A quick look at the plots also showed a weather file of seemingly good quality:
[cid:image002.png at 01D0EA22.96F4D600]
[cid:image003.png at 01D0EA22.96F4D600]
Problem solved!
Joe
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Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 205A
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http://weather.whiteboxtechnologies.com for simulation-ready weather data
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