Paths at different elavations
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etwisper
Mar 5, 2007, 6:14:08 PM3/5/07
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In the previous version before "Google Earth" you were able to draw a line between 2 points at different elevations and you could see the path for any obstructions. I work for a wireless ISP and this was a great tool for line of sight analysis. Does anyone know if there is a way to get back this feature or load in some code to enable it. Any help would be appreciated.
triphazard
Mar 9, 2007, 1:16:29 PM3/9/07
to KML Discussions
Create a path with two points.
In the Altitude tab of the waypoint properties, change the altitude from 0m to some positive number, like 1m.
At this time, you can change the line from "clamped to ground" to "relative to ground".
This will give you a straight line between the two points. You can move the end points around to do your line-of-site checks.
If you want the individual points to be at different altitudes, you can use "absolute" instead of "relative to ground", if that works better for you. You'd then manually edit the saved placemark (as a .kml), to set the altitude of individual points. You might also want to check the box in the Altitude tab to enable "extend path to ground". This'll give you a virtual tower for each point.
When you edit the .kml, you'll see something like this:
<coordinates>
-122.6544405643015,38.65170668316823,25 -122.6579329490888,38.66649631942096,100
</coordinates>
In this example, I'm using "relative to ground". I changed the altitude from 1 to 25 for the first point and to 100 for the 2nd point. Note that these altitudes are in meters.
For fun, after you've turned on "extend path to ground", go to the "style, color" tab and change the Area opacity to 50 percent and style to either "filled" or "filled+outlined".
All this is my best guess. There may well be a better way to do what you want.
In the Altitude tab of the waypoint properties, change the altitude from 0m to some positive number, like 1m.
At this time, you can change the line from "clamped to ground" to "relative to ground".
This will give you a straight line between the two points. You can move the end points around to do your line-of-site checks.
If you want the individual points to be at different altitudes, you can use "absolute" instead of "relative to ground", if that works better for you. You'd then manually edit the saved placemark (as a .kml), to set the altitude of individual points. You might also want to check the box in the Altitude tab to enable "extend path to ground". This'll give you a virtual tower for each point.
When you edit the .kml, you'll see something like this:
<coordinates>
-122.6544405643015,38.65170668316823,25 -122.6579329490888,38.66649631942096,100
</coordinates>
In this example, I'm using "relative to ground". I changed the altitude from 1 to 25 for the first point and to 100 for the 2nd point. Note that these altitudes are in meters.
For fun, after you've turned on "extend path to ground", go to the "style, color" tab and change the Area opacity to 50 percent and style to either "filled" or "filled+outlined".
All this is my best guess. There may well be a better way to do what you want.
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