[CON Devel] Need valid 'point_cem.txt' file for 2002 NEI dataset

[Mark Janssen]

PointCEM is used to reference day and hour specific values for 
emissions. If you consider
using pointEM records to portray hour specific records you would be 
talking about 8760(365*24) records
for each pollutant for each process. The PointCEM allows you to put 
24 hourly observations on each record so you can do it in 365 
records. This has a real world impact for us at LADCO because if you 
take the raw CEM(Continuous Emissions Monitoring from electric 
utilities) data for 2002 and try to use it in modeling each month's 
CEM records for the USA is about 3 gig so a year's worth of CEM data 
in pointEM format is over 30 Gigabytes.

Even in a world where you want to use CEM data to develop complex 
temporal profiles like those created for LADCO by Scott Edick there 
are size considerations. In Scott's work we create a 
weekday/Saturday/Sunday for every month so we need 36 days by 24 
hours and you get 3.5 Gigabytes of data that would compress more than 
24 times with pointCEM formatted records.

I do not know our plan right now for development of pointCEM records 
for the period of 2000-2005 based on raw CEM but Scott Edick could 
answer that for you? You do not need a fully populated pointCEM if 
you are not involved in complex temporal for EGUs. So you can put an 
empty one in the correct location.

So the short answer is pointCEM is just a compressed version of a 
pointEM record and not critical for model operation.

Mark


At 11:24 AM 10/13/2006, Seib, Broc wrote:
>Hi all,
>
>We are getting ready to do work with the 2002 NEI dataset. I downloaded
>the EPA's 2002 NEI dataset for point and area from these places:
>
>Area:
>ftp://ftp.epa.gov/EmisInventory/2002finalnei/nonpoint_sector_data/nation
>al/2002nei_nonpoint_detailed_data_022306.zip
>
>Point:
>ftp://ftp.epa.gov/EmisInventory/2002finalnei/point_sector_data/national/
>nei2002_point_detailed_data_080206.zip
>
>
>First I would like to confirm that these are indeed the correct files
>representing the 2002 NEI dataset.
>
>Second, when I unzip these I get the following files, I rename them to
>accommodate CONCEPTs naming conventions. So I have this list of files
>from those two zip files:
>
>  nei_area_ce.txt@ -> area/cearea.txt
>  nei_area_em.txt@ -> area/emarea.txt
>  nei_area_ep.txt@ -> area/eparea.txt
>  nei_area_pe.txt@ -> area/pearea.txt
>  nei_area_tr.txt@ -> area/trarea.txt
>
>  nei_point_ce.txt@ -> point/cepoint.txt
>  nei_point_em.txt@ -> point/empoint.txt
>  nei_point_ep.txt@ -> point/eppoint.txt
>  nei_point_er.txt@ -> point/erpoint.txt
>  nei_point_eu.txt@ -> point/eupoint.txt
>  nei_point_pe.txt@ -> point/pepoint.txt
>  nei_point_si.txt@ -> point/sipoint.txt
>  nei_point_tr.txt@ -> point/trpoint.txt
>
>
>However, where is the file "point_cem.txt" -- CONCEPT is expecting it to
>be there when I do the NEI imports. And what does this file represent?
>Is this another one I need to download from the EPA site?
>
>Thanks,
>Broc Seib
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