We strongly recommend using Metar surface information or NWP output to better describe surface conditions in retrieval processing. Numerical model output can be used as a first guess field for the atmosphere and surface. Any model can easily be adapted to fit in the IAPP retrieval scheme. Clearly written documentation makes this task relatively easy. Alternatively, a regression of raob radiance comparisons can be used to provide a first guess.
Detailed information is provided in the documentation.
Licensing The IAPP source code will have licensing restrictions in that you can use it at your or your customer s site, but cannot re-distribute any portion of the software. All future upgrades to the IAPP will be at no additional cost to the licensee. Thus, your licensing fee is going to improve the capabilities of the package. If using ftp, we will respond with an ftp address and instructions to download the software. The .tar file is about 200 mb in size.