×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

#### Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
To Your Posts
• Keyword Search
• One-Click Access To Your
Favorite Forums
• Automated Signatures
On Your Posts
• Best Of All, It's Free!
• Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

#### Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

# Translating Zenith angle to another point

 Forum Search FAQs Links MVPs

## Translating Zenith angle to another point

(OP)
I located the tops of some trees(about 350 points) using an instrument in reflector-less mode from a point on the ground. I also have a point that I have a coordinate on, roughly 7 meters above my ground point which cannot be occupied by an instrument.I need to determine what the zenith angles would be from the elevated point to the tree tops.I was trying to do the " transformation" for lack of a better word,in Leica Geo Office and Carlson Software but can't figure it out. Also, I'm not really sure how to do it using a calculator.I'd appreciate any input or suggestions on how to do this. Perhaps some other software is capable of doing this.

Thanks so much,
Capt.Howdy

### RE: Translating Zenith angle to another point

I'm not quite understanding what you're saying.  If the point is above the point where you took the measurement, then all the tree tops form right angles to your measurement point, and you just lop off a chuck of the rising leg and calculate a new arctangent using the same base leg.

### RE: Translating Zenith angle to another point

It's always a good idea to include a sketch of the sort of problem that you have. I think that I understood your post properly, so I took the liberty to include a sketch with a solution in the jpeg attachment.  Hopefully that what you are looking for-- simple geometry problem.

### RE: Translating Zenith angle to another point

I messed up on my first submission. Sorry, please check second submission.

### RE: Translating Zenith angle to another point

(OP)
Thanks to all for the responses.Chicopee, I guess it would have been more accurate for me to say that I had forgotten how to do the calculations by hand then to say I "wasn't sure" how to do them. Growing up in the computer age can make a person forgetful & sometimes lazy. Also, with the amount of calculations necessary to complete the project, I was looking for a more efficient way of doing this.

Thanks

### RE: Translating Zenith angle to another point

You can throw everything into Excel and array the formulas.

### RE: Translating Zenith angle to another point

(OP)
Thanks very much for the tip IRstuff

#### Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

#### Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

### Reply To This Thread

#### Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!

Already a member? Close this window and log in.