LinkPlanner does this.  Then you can copy it to Google Earth.

On 3/29/10, Forbes Mercy <forbes.me...@wabroadband.com> wrote:
> Wouldn't it be cool if when using Google Earth you could draw a straight
> line between two points and it would calculate the altitude of each
> origin point then mark in red any place where altitude is higher than
> the beginning and end points along the line?  For long legs in mixed
> altitude areas that would really be nice.
>
> Forbes
>
> On 3/29/2010 1:12 PM, Jim Patient wrote:
>> Well, it prolly isn't good every place but I just selected 3d buildings
>> on google earth and drug my mouse from the street to top of Met Square
>> in St Louis.  It shows the elevation at street level and the top of the
>> building.
>> The difference is the elevation of the building height in this case.
>>
>> Jim
>>
>>
>> On 3/29/2010 2:03 PM, Cameron Crum wrote:
>>
>>> Not for free. This info is usually pretty expensive for good high res
>>> data. That being said, one interesting flaw in the SRTM data is that is
>>> contains "building canopy" within the data. The radar they used bounced
>>> off man made structures and make them appear to be part of the terrain.
>>> So, in big cities, or even small ones in core areas, if you are running
>>> propagation plots, you would not want to add additional building
>>> heights. If you want the most accurate results, I suggest 10m DEM's
>>> (where available) with a good set of building elevation data (the
>>> expensive stuff). If you are just looking to run propagation plots for
>>> your unlicensed network, The SRTM data is probably good enough.
>>>
>>> Cameron
>>>
>>> On 3/29/2010 12:07 PM, Charles Hooper wrote:
>>>
>>>
>>>> Hello,
>>>>
>>>> Does anyone know a reliable source/method of getting building heights?
>>>> Something like a topographical map that included buildings would be
>>>> excellent, but I haven't been able to find anything like this.
>>>>
>>>> Thanks!
>>>> Charles
>>>>
>>>>
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