Frequently asked questions
The GREET research team gather data and produces models to calculate life cycle energy and emission related to the transportation sector. This project was started a long time ago using Excel spreadsheets, but now it becomes harder and harder to maintain and expand theses spreadsheets. Even if the spreadsheets gives full tractability, it is also very complex to find and modify information in these spreadsheets.
This is why the GREET team is now using this software as a new platform for life cycle assessment studies and database management. This new platform combines all the previous Excels spreadsheets in a single environment with a single database that is now easier to maintain and manage.
By default, the results in GREET new platform and GREET Excel are tested and are essentially the same. We are testing our results and validate them before releasing the software. This gives us the opportunity to check the algorithms of both version and make sure all numbers are accurate. In the case we found differences we usually track down the issue and fix it right away in the software or database, then if an error in Excel is detected we forward the information to the Excel team that fixes it. However Excel releases are usually less frequent and delay should be expected.
If you need to compare data files for the new platform, we recommend to use the merging tool which was designed for this purpose. If you are trying to see changes between Excel version you'll have to figure out an algorithm to analyse all the formulas and cells values... The power of the new GREET platform is also to provide an easier way to track changes between revisions.
If anyways you have concerns about the data please contact us using one of the links on our Contact Us section
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