Your question does not have a simple solution. MapInfo is basically a 2-D GIS (x,y) tool and you are trying to find intersections in 3 dimensions or at least in 2 dimensions that MI does not typically operate (x,y,z or x,z or y,z). What you need to do this type of planning is terrain data and clutter data (with elevations). Depending on how accurate you need your terrain and clutter to be (and I would suggest to do uW planning correctly, you need very accurate terrain and clutter databases) this can be quite pricey depending on where you are in the world. You will then have to write a program which will take into account your transmitter and receiver locations and elevations (AGL) and then determine the elevation of the "line" connecting the two at every terrain point along the path. This is not a simple task either because you must also take into account the curvature of the earth, and since you're talking about high frequency radio waves, the atmostpheric conditions (i.e. refractive indexes and such). Also, simply clearing the obstacles will not provide a reliable communications link. You also need to determine the first fresnel zone of the path and make sure that this is not obstructed as well.
I know you are looking for a free solution, but it is unlikely that one exists that is worth the time to download it. I believe that Vertical Mapper has a line of sight tool in it that will identify obstructions, but again, this will not be an entire solution to your problem. There are other tools available (search the internet for Microwave Planning tools) which are reasonably priced in my opinion which will accomplish the task at hand, but they are not MI based. Our RF Planning Tool, Athena, is a comprehensive MapInfo based solution for all types of wireless network planning, but it would be overkill for basic uW planning and probably would be way out of your price range if you are looking for a free tool. We can provide a custom solution for you if you desire. Let me know. Cameron Crum Wave Concepts www.waveconceptsintl.com Vijayalakshmi wrote: > Hi > > I am working on wireless network planning. We are using MapInfo for it, > along with Mapbasic. I am looking for a readymade mapbasic utility to > find objects on a map that intersect with a given line segment > (essentially to find the obstructions in the path between a microwave > Transmitter and Receiver). > > Can anyone let me know if such a utility is available for free download? > > Thanks > Vijayalakshmi. > > ********************************************************* > Disclaimer > > This message (including any attachments) contains > confidential information intended for a specific > individual and purpose, and is protected by law. > If you are not the intended recipient, you should > delete this message and are hereby notified that > any disclosure, copying, or distribution of this > message, or the taking of any action based on it, > is strictly prohibited. > > ********************************************************* > Visit us at http://www.mahindrabt.com > > --------------------------------------------------------------------- > List hosting provided by Directions Magazine | www.directionsmag.com | > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > Message number: 3663 --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 3666
