Re: Inputting weather data

[Jonathan Knox]

Hi SWAT users,

So I have been inputting my weather data directly into the SWAT2012 Access database WGEN_user table i.e I deleted all preexisting example weather stations and imported the attached .csv (Weather_FILLED.csv) as a replacement. I left the header for the WGEN_user table in tact.

When I Write the Input Tables- Weather Data Definition, SWAT allows me to select the WGEN_user table, while under the Weather Generator Data tab and reads that there are all 42 stations in my table but when i select 'OK' the attached error occurs (Weather_Error.jpg).

Does anybody have any ideas what might be causing this? As I mentioned I have attached the .csv I am using for my weather data import if you want to take a look.

Regards,
Jonathan

[R Srinivasan]

in your csv file, I see there are many -99 values, which is not acceptable. Please fix them first and replace the wgen_user table

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[Jonathan Knox]

Hi there,

Bar simulating the data there is no way I can replace these values. The government data for the area of my study is sporadic at best. I did read in the SWAT Input/Output documentation however that you can input -99 values for nodata and SWAT does it's best to simulate missing values from the observed data you do have. Unless I am mistaken?

Regards,
Jonathan

[R Srinivasan]

The swat documentation refers to simulating individual variables using the weather generator statistics. So the weather statistics wgen_user table should be fully populated. Hope this helps.

To view this discussion on the web visit https://groups.google.com/d/msg/arcswat/-/sC4ZY4R7GqwJ.

[Jonathan Knox]

In that case there are only two stations that I have complete data for. This leaves me with the question how accurate is my model going to be considering I am modelling an area of 5,660 km2 and will have 2 weather stations approximately only 60km apart?

At any rate I also managed to overcome the error; it wasn't due to the -99 values (which obviously still is a problem i have to overcome) but due to an apostrophe in one of the station names- see OBJECTID #27 in the previously attached .csv.

Do you however have any suggestions regarding my missing data? It seems a waste to cut 40 weather stations...

[Srini]

There is a new data source for weather from globalweather.tamu.edu
This is roughly 40km x 40km resolution data.

R. Srinivasan Director and Professor
r-srin...@tamu.edu Spatial Sciences Laboratory
http://www-ssl.tamu.edu Texas A&M University

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From: Jonathan Knox <jonty...@mail.mcgill.ca>

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Date: Wed, 10 Oct 2012 13:19:20 -0700 (PDT)

To: <arc...@googlegroups.com>

Cc: Jonathan Knox<jonty...@mail.mcgill.ca>

Subject: Re: [ArcSWAT:4542] Re: Inputting weather data

To view this discussion on the web visit https://groups.google.com/d/msg/arcswat/-/MWsJR-Pl0P0J.

[Liem Nguyen Duy]

Dear Srini,

Thanks for your information about the useful website.

I accessed the website but I can not download data.

Maybe something is wrong?

2012/10/11 Srini <r-srin...@tamu.edu>

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Nguyễn Duy Liêm.
Trung tâm Nghiên cứu Biến đổi Khí hậu,
Trường Đại học Nông Lâm TP. HCM.
Địa chỉ: phường Linh Trung, quận Thủ Đức, Tp. HCM, Việt Nam

Website:  http://rccc.hcmuaf.edu.vn/ 
Email: nguyen...@gmail.com

          nguyen...@yahoo.com

Mobile: (+84) 0983-613-551

Nguyen Duy Liem.
Research Center for Climate Change (RCCC),

Nong Lam University- Ho Chi Minh City.
Address: Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam.

Website:  http://rccc.hcmuaf.edu.vn/ 
Email: nguyen...@gmail.com

          nguyen...@yahoo.com

Mobile: (+84) 0983-613-551

[Jonathan Knox]

Thank you for the link to the data, I appreciate the time and effort you have gone to in replying to my problem. I am sure it will fill the gaps in my dataset, currently however I am getting the following error (see attached .jpg). Is this an error from my end?

--
Jonathan Knox
GIS and Environmental Modeling Technician,
McGill University Dept. of Biology,
Montreal, QC, Canada
Email: jonath...@mail.mcgill.ca

[Srini]

This is on our end. Need to fix a bug we identified yesterday late. Will be back online soon.

R. Srinivasan Director and Professor
r-srin...@tamu.edu Spatial Sciences Laboratory
http://www-ssl.tamu.edu Texas A&M University

---

From: Jonathan Knox <jonty...@mail.mcgill.ca>

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Date: Thu, 11 Oct 2012 06:57:30 -0700 (PDT)

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Cc: Jonathan Knox<jonty...@mail.mcgill.ca>; <r-srin...@tamu.edu>

Subject: Re: [ArcSWAT:4550] Re: Inputting weather data

To view this discussion on the web visit https://groups.google.com/d/msg/arcswat/-/FT4YSnHm2TEJ.

[Jonathan Knox]

Hi,
So all the data fits together nicely with my observed values. However I noticed a discrepancy with the solar radiation in the data extent I selected. For solar, on the 12/31/.... every year, the generated data registers as 0, in addition to this the same problem also occurs for the 5/31/1986 on all lat/long points. If you would like the data link I was sent I can email that to you. It doesn't make a huge amount of difference at the end of the day, I can either omit these values or just take a monthly average etc. I just thought you should be informed of the possible error.

Thanks again for the data,
Jonathan