CMAQ Air Modeling Data Validation Crashes BenMap

I have been trying to run an Ozone run using D1HourMax based on CMAQ modeled results. I was provided with the input files, but it is my understanding that the files were produced using post-processing scripts available from EPA or CMAS. When I go through the prompts to use Air Modeling Data for the baseline data I do not have the option of just clicking the “OK” button.

When I click to “validate” the data, in the hopes that will give me an “OK” button it just crashes with the following error message: “The application encountered the following fatal error: Object reference not set to an instance of an object. Would you like to report the error…”

I am using a custom domain, but had successfully used this GIS file with CMAQ data way back in version 1.something. I also have used it just fine in rollback analyses.

I originally was doing this with v1.3.7.1, but just upgraded to v1.4.14.1 and have the same problem.

Hi Joseph,

I’m sorry to hear that you’ve had trouble creating air quality grids and the validation step. A work-around is to turn off data validation by navigating to tools–>options.

I hope this helps!

Well it got me an “OK” button, but then the files seemed to load instantly, which was suspicious since BenMap usually takes a long time to load. I then noticed that the AQGX files were not actually saved to the harddrive and though gridded files show up in BenMap, when I double click on them to view them nothing happens.

Hi Joseph,

My best guess is that the air quality input file isn’t correctly formatted. Can you past the first through third rows of your input file as a response? I’d like to see how you’ve specified the pollutant metrics.

Here you go (it only let me enter about a half of the first line though):

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By the way, I noticed when I pasted it after I hit submit that two commas went missing after “D1HourMax,”.

Hi Joseph,

Sorry for the delay. I didn’t actually count the number of entries above, but it looks like you’ve imported O3 values for each hour of each day of the year. Is that correct? If so, you can leave the “metric” column blank, as BenMAP-CE will calculate this and other ozone metrics for you.

Let me know if this works.

I thought that it needed to know whether the hourly values were 1 hour values or 8-hour rolling average values so you needed the one metric?

That’s a reasonable assumption. However, when you’re providing a full string of 8760 values, you don’t specify a metric in the metric column. Rather, the program calculates each metric as specified in the pollutant definition.

So I did some digging since I still cannot get it working, Would BenMap break without any clear indications if you provided 8761 instead of 8760 values for hourly data?

So I got it working! The two things that came out of it.

  1. It appears that the original issue with the validation crashing BenMap was due to the lack of a header on the original file. Without a header it crashes, when the header is added validation runs just fine.
  2. It appears that the file itself was not displaying because the data in Values was ending like this: .,.,.,.," getting rid of that trailing comma so it was .,.,.,." fixed that problem.

Joseph–that’s great to hear. Sorry for the delay; I was just about to respond. Glad to hear that you’ve got it working.