# GenCumulativeSky - problem of reading .epw file

**URL:** <https://discourse.radiance-online.org/t/gencumulativesky-problem-of-reading-epw-file/998>\
**Category:** radiance-general\
**Created:** [November 29, 2010, 10:57am UTC](https://discourse.radiance-online.org/t/gencumulativesky-problem-of-reading-epw-file/998 "2010-11-29T10:57:35Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Kam\_Shing\_Leung](https://discourse.radiance-online.org/letter_avatar_proxy/v4/letter/k/4491bb/32.png) [@Kam\_Shing\_Leung](https://discourse.radiance-online.org/u/Kam_Shing_Leung)\
**Post date:** [November 29, 2010, 10:57am UTC](https://discourse.radiance-online.org/t/gencumulativesky-problem-of-reading-epw-file/998/1 "2010-11-29T10:57:35Z")

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Dear all,

I have tried to use the GenCumulativeSky.exe programme made available through  
Diva for Rhino v1.1f.

When I ran the programme on a DOS command line, it said:

> **···**
>
> \*\*  
> Error opening: SGP\_Singapore.486980\_IWEC.epw  
> GenCumulativeSky: Error reading climate file SGP\_Singapore.486980\_IWEC.epw  
> \*\*
> 
> I tried it with the San Francisco .epw file as well but it also didn't work.
> 
> Could anyone advise how it can be solved?
> 
> Also, may I know what it means by "hourshift" in the -h entry?
> 
> Thanks a lot!
> 
> Cheers,  
> Kam

---

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**Author:** ![Reinhart\_Christoph2](https://discourse.radiance-online.org/letter_avatar_proxy/v4/letter/r/a88e57/32.png) [@Reinhart\_Christoph2](https://discourse.radiance-online.org/u/Reinhart_Christoph2)\
**Post date:** [November 29, 2010, 1:17pm UTC](https://discourse.radiance-online.org/t/gencumulativesky-problem-of-reading-epw-file/998/2 "2010-11-29T13:17:46Z")

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Dear Kam,

This posting might be better suited for the DIVA-for-Rhino forum  
([http://groups.google.com/group/diva-for-rhino](http://groups.google.com/group/diva-for-rhino)) but maybe  
GenCumulativeSky is also of interest to some on the general Radiance  
list. The program was written by Darren Robinson and generated a  
cumulative sky for annual or monthly radiation maps . There are similar  
methods available by Francesco Anselmo and John Mardaljevic.

The program is started with:

GenCumulativeSky +s1 -a 45 -o 76 -m 75 -r -E -time 0 24 -date 1 1 12 31  
epw\_file \> Gund\_111.cal

You could try to debug your epw file from Singapore using the command  
line. We are actually working on a project in Singapore right now and  
the local file worked for us.

Christoph

[[mailto:radiance-general-bounces@radiance-online.org](mailto:radiance-general-bounces@radiance-online.org)] On Behalf Of Kam  
Shing Leung

> **···**
>
> From: [radiance-general-bounces@radiance-online.org](mailto:radiance-general-bounces@radiance-online.org)  
> Sent: Monday, November 29, 2010 5:58 AM  
> To: [radiance-general@radiance-online.org](mailto:radiance-general@radiance-online.org)  
> Subject: [Radiance-general] GenCumulativeSky - problem of reading .epw  
> file
> 
> Dear all,
> 
> I have tried to use the GenCumulativeSky.exe programme made available  
> through Diva for Rhino v1.1f.
> 
> When I ran the programme on a DOS command line, it said:
> 
> \*\*
> 
> Error opening: SGP\_Singapore.486980\_IWEC.epw
> 
> GenCumulativeSky: Error reading climate file  
> SGP\_Singapore.486980\_IWEC.epw
> 
> \*\*
> 
> I tried it with the San Francisco .epw file as well but it also didn't  
> work.
> 
> Could anyone advise how it can be solved?
> 
> Also, may I know what it means by "hourshift" in the -h entry?
> 
> Thanks a lot!
> 
> Cheers,
> 
> Kam