Help needed with Google Earth

[echnidna]

I need to establish the amount of fall between a water tank at the Brucknell Scout Camp and the creek through the property to see if its practical to replace a defunct water pump with a solar pump.

My computer isn't good enough to run google earth clearly.
And for some odd reason the elevation readings I am getting on the creek shows that it must be flowing uphill.

The coordinates for the tank are
approx 38 28 21 82 S142 51 33 98 Elevation 269ft
(at the south end of the clearing)
and for the creek
approx 38 28 22 83 S142 51 57 99 Elevation 211 feet

Could someone conversant with google earth please assist

[silentC]

Or you could do it the old fashioned way and get the 1:25000 contour map. Any Boy Scout worth his salt would have one of them for his local area.

[echnidna]

NRE promised me a map months ago but time just rolls on.
The water pump died a few days ago and I need to get the water supply working again urgently.
I havent got a sighting level or I would accurately shoot the fall over the half kilometre or so.

[silentC]

Can't you pick up the CMA (or whatever passes for it in Victoria) map? My local newsagent sells all the maps for our area and can get any others in that we need. Or you could buy it online: http://www.themapshop.com.au/site/in...duct_id=164038

[echnidna]

about a 40k drive to buy a map.
Jest remembered theres online maps through some govt website, dont know how to find the access.

[silentC]

Neither do I. Would be interested to find out though. Never seen contour maps online.

Doesn't the postman come out your way?

[maglite]

Try emailing the national parks mob or the state forestry commission....or whatever they call themselves over that way.

They may be able to send one via email or at least point you in the right direction.

Cheers
Steve

[Rocker]

Bob,

I get the same elevations as you do from Google Earth for those locations, but I don't think elevation data in Google Earth is accurate enough for your purposes. I think you definitely need to get a contour map.

Rocker

[Termite]

Bugger, Rocker just beat me to it....ah well it was good excercise.

[ozwinner]

Try here Bob, youll have to pay though I think.

Al

[Groggy]

I tried my GPS software and some OziExplorer software and maps I have but the best I have for the area is 1:250,000. You need at least 1:50,000 for something down to that resolution.

I could get some from work but not till mid Jan. You could always ask someone with a gps to drive to the two points and read the result.

[Termite]

OK, can you see in a straight line from your creek to your tank?

If so, then grab a camera that you can see something in the middle of the lens. Grab your protractor square and, at the creek end of things, look through the camera and line the thing in the centre of the lens up with something on the tank the same height off the ground as the camera......measure the angle.
Now if you know the angle and the distance between the creek and the tank you then use trigonometry to find out how far the tank is above the creek.

Or just sight along the rule, keeping the protractor base level.

PM me the distance and the angle and I will give you the height difference.

[Wood Borer]

Bob,

I have discovered that elevations on my GPS are not very accurate which is where I assume your original came from.

What distance are we talking about between the creek and the tank? The accuracy probably only needs to be within a metre.

You could possibly work it out using a hose and water levels.

Perhaps our resident Hydrologist on the Bulletin Board could offer you advice.

[namtrak]

I sent your stuff off to my BIL and he reckons the contour data will be too broad to get your result

[echnidna]

I can't get anything like a straight line of sight.
While google earth shows about a 70 ft head I really guesstimate its closer to 150 feet or more.