INVITATION TO FORUM MEMBERS TO TRANSLATE:
The Irregular Terrain with Obstruction Model (ITWOM)
Request is hereby made to forum members who have spare time, ready and willing to do a volunteer work to prepare a translation of equations (Cookbook) used in propagation model known as Irregular Terrain with Obstruction Model (ITWOM ver.3) version 3. This will allow us to write a Java equivalent program for ITWOM to be used in the new Terrain EPP within SEAMCAT environment. At the moment ITWOM is written in C++
What is ITWOM?
ITWOM is a combination of two well know propagation models; Irregular Terrain Model (ITM)/Longley-Rice and ITU-R P.1546, this model uses the Radiative Transfer Engine (RTE) to calculate loss through the clutter canopy. Because of this it produces results that are far more superior to that produced by the original ITM/Longley-Rice.
ITWOM can be used in the frequency range between 20 MHz and 20 GHz.
ITWOM can be used in both Point-to-Point mode and Point-to-Area mode, this model utilises digital terrain data such as SRTM.
What are the ITWOM License Requirements?
Recently, ITWOM ver.3 has been released as an open source under a GNU General Public License version 2 published by the Free Software Foundation effectively allowing members of the public to re-distribute or modify it under such terms.
Where is ITWOM Currently used?:
Currently, ITWOM vers.3 has been incorporated in a popular open source tool known as (RF Signal Propagation, Loss, And Terrain) SPLAT!.
The source codes for this tool including ITWOM ver.3 are freely available in the following url:
http://www.qsl.net/kd2bd/splat.html
ITWOM Documentations:
The following core documents are attached herewith:
The ITWOM sub-routine list.
The original core documentation for ITM/Longley Rice "Tech-Note 101".
Additionally, a presentation by Mr. Sid Shumate introducing ITWOM is found in the following url:
http://www.its.bldrdoc.gov/isart/art08/slides08/shu_s-08.pdf
Everybody reading this post is cordially invited to take part on the discussion and, of course, requested to contribute any proposal to get at the end a convincing Terrain Profile feature for SEAMCAT.
Kind Regards,
Luzango Pangani Mfupe Karl Koch