# Customized 4km Domain for SMOKE **URL:** \ **Category:** SMOKE\ **Tags:** admin, smoke, smoke-481, cmaqsmoke, emissions\ **Created:** [February 17, 2022, 10:09pm UTC](https://forum.cmascenter.org/t/customized-4km-domain-for-smoke/3008 "2022-02-17T22:09:05Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Iqbal](https://avatars.discourse-cdn.com/v4/letter/i/bc8723/32.png) [@Iqbal](https://forum.cmascenter.org/u/Iqbal)\ **Post date:** [February 17, 2022, 10:09pm UTC](https://forum.cmascenter.org/t/customized-4km-domain-for-smoke/3008/1 "2022-02-17T22:09:05Z")
Hello, EPA’s 2016v1platform ftp://newftp.epa.gov/Air/emismod/2016/v1/ has 36km and 12km domain SMOKE set-up. Using the same emission inputs, I want to create SMOKE output files for a customized domain (4km grid cells) that is not available in the griddesc\_lambertonly\_18jan2019\_v7 file. I have added following lines for my domain in the griddesc\_lambertonly\_18jan2019\_v7 file: > ‘ARUS4’ > ‘LAM\_40N97W’, -90000.000, -1284000.000, 4000.000, 4000.000, 280, 308, 1 Then I created several SMOKE outputs using the same inputs that are available in the SMOKE folder in ftp://newftp.epa.gov/Air/emismod/2016/v1/. The simulation is successful. I was wondering if anyone could provide me feedback/suggestions about the process I used for the 4km grid cells run. Is the procedure to generate finer grid cells data right?. Is there any other way to simulate SMOKE for a customized grid domain? Thank you ---
**Author:** ![eyth.alison](https://avatars.discourse-cdn.com/v4/letter/e/7ab992/32.png) [@eyth.alison](https://forum.cmascenter.org/u/eyth.alison)\ **Post date:** [February 18, 2022, 5:45pm UTC](https://forum.cmascenter.org/t/customized-4km-domain-for-smoke/3008/2 "2022-02-18T17:45:27Z")
There are instructions related to running on your own grid here: [https://gaftp.epa.gov/Air/emismod/2017/general\_for\_running\_other\_grids.txt](https://gaftp.epa.gov/Air/emismod/2017/general_for_running_other_grids.txt) Although this is for the 2017 platform many of the principles apply. Note that the 2016 platform includes 4km surrogates (starting with CONUS4) that you could use for your own 4km grid if your grid has the same Lambert projection: [https://gaftp.epa.gov/Air/emismod/2016/v2/spatial\_surrogates/](https://gaftp.epa.gov/Air/emismod/2016/v2/spatial_surrogates/) It wasn’t clear if you used those. The 2016v2 platform has some updates from 2016v1 in that it uses more data from 2017 NEI, onroad from MOVES3, and some new methods. [https://www.epa.gov/air-emissions-modeling/2016v2-platform](https://www.epa.gov/air-emissions-modeling/2016v2-platform) ---
**Author:** ![Iqbal](https://avatars.discourse-cdn.com/v4/letter/i/bc8723/32.png) [@Iqbal](https://forum.cmascenter.org/u/Iqbal)\ **Post date:** [March 17, 2022, 8:31pm UTC](https://forum.cmascenter.org/t/customized-4km-domain-for-smoke/3008/3 "2022-03-17T20:31:11Z")
Hello, Sorry for the late reply. So, I have gathered following information from the link you provided: 1. MCIP (meteorology) data is needed for the sectors onroad, onroad\_ca\_adj, dust, and biogenics. 2. XPORTFRAC is required for the afdust, othafdust, and othptdust sectors. The only changes are required for all other sectors are: modifying GRIDDESC and surrogates. For example: (ptegu sector) I have modified GRIDDESC for a 4km domain ![Screenshot from 2022-03-17 15-01-11](https://canada1.discourse-cdn.com/flex027/uploads/cmas/original/2X/7/76d7f76b61db40f2c985e68bbaa6007461e2d290.png) And then I modified surrogate file location for the 4km ![Screenshot from 2022-03-17 15-32-11](https://canada1.discourse-cdn.com/flex027/uploads/cmas/original/2X/8/8d04f7863854451510e3760451bf754d14f1b16b.png) SMOKE run is completed without any issues. But I have some questions: 1. I see there are lots of surrogates file for each domain. For example for the 4km ![Screenshot from 2022-03-17 14-55-25](https://canada1.discourse-cdn.com/flex027/uploads/cmas/original/2X/3/3acfca271b4244fd3f2858557328e596cf71f0de.png) Which one to use? I am using USA\_100\_NOFILL.txt. What are the differences between files?. Is there any document for that? 1. How do I check whether my SMOKE run is successful? 2. Do I have to modify srgdesc\_CONUS12\_2017NEI\_17dec2019\_13may2021\_v3.txt file for the 4km? Thank you so much for your kind suggestions and help ---
**Author:** ![eyth.alison](https://avatars.discourse-cdn.com/v4/letter/e/7ab992/32.png) [@eyth.alison](https://forum.cmascenter.org/u/eyth.alison)\ **Post date:** [March 18, 2022, 4:13pm UTC](https://forum.cmascenter.org/t/customized-4km-domain-for-smoke/3008/4 "2022-03-18T16:13:38Z")
Surrogates aren’t typically used for point source sectors so I’m not sure Are you using the EPA run scripts by sector from one of the platforms such as the ones provided here? [https://gaftp.epa.gov/Air/emismod/2017/smoke\_2017gb\_platform\_core\_09feb2021.zip](https://gaftp.epa.gov/Air/emismod/2017/smoke_2017gb_platform_core_09feb2021.zip) These are the starting point before customizing for other grids as needed. There is more information about the general process to run SMOKE for 2017 here: [https://gaftp.epa.gov/Air/emismod/2017/2017gb\_package\_12jul2021\_info.txt](https://gaftp.epa.gov/Air/emismod/2017/2017gb_package_12jul2021_info.txt) ---
**Author:** ![Iqbal](https://avatars.discourse-cdn.com/v4/letter/i/bc8723/32.png) [@Iqbal](https://forum.cmascenter.org/u/Iqbal)\ **Post date:** [March 18, 2022, 6:28pm UTC](https://forum.cmascenter.org/t/customized-4km-domain-for-smoke/3008/5 "2022-03-18T18:28:44Z")
Yes, I am using exactly the same scripts provided in 2016v2 platform [https://gaftp.epa.gov/Air/emismod/2016/v2/](https://gaftp.epa.gov/Air/emismod/2016/v2/) except the change I mentioned in comment#3 for the 4km domain. I am following the instructions from here [https://gaftp.epa.gov/Air/emismod/2017/general\_for\_running\_other\_grids.txt](https://gaftp.epa.gov/Air/emismod/2017/general_for_running_other_grids.txt) . And I just wanted to be sure if my approach is correct. And wanted to know more about what each surrogates files (comment#3) mean. Thanks in advance ---
**Author:** ![eyth.alison](https://avatars.discourse-cdn.com/v4/letter/e/7ab992/32.png) [@eyth.alison](https://forum.cmascenter.org/u/eyth.alison)\ **Post date:** [March 18, 2022, 7:00pm UTC](https://forum.cmascenter.org/t/customized-4km-domain-for-smoke/3008/6 "2022-03-18T19:00:09Z")
What sector(s) is your question specific to and what script? ---
**Author:** ![Iqbal](https://avatars.discourse-cdn.com/v4/letter/i/bc8723/32.png) [@Iqbal](https://forum.cmascenter.org/u/Iqbal)\ **Post date:** [March 21, 2022, 4:18pm UTC](https://forum.cmascenter.org/t/customized-4km-domain-for-smoke/3008/7 "2022-03-21T16:18:58Z")
I have used ptegu sector as an example. The run is completed without any error. The setting I used is attached in comment#3 . I just wanted to know if my approach is correct or not. Thank you so much for the suggestions