Known Elevation points

Discussion about software such as GSAK, OziExplorer etc, as well as all things hardware, GPSrs, laptops, PDAs, paperless caching, cables etc
Post Reply
User avatar
GIN51E
600 or more caches found
600 or more caches found
Posts: 774
Joined: 19 June 05 11:07 am
Location: Waitara Magellan Explorist 600

Known Elevation points

Post by GIN51E » 18 May 13 10:39 am

Hi Guys Girls and Kids,
Been a long time since I've been on here or found a cache actually, been years.
A few of the originals will remember my name or or newbies may have found a couple of my remaining caches.

Anyhow to the point I've been searching and searching the internet trying to find this information but can't get it anywhere.
And with the wealth of knowledge I know that's in these forums I hope someone can point me in the right direction.

I've got myself a Garmin Edge 510 cycle computer, which to the point has a Barometric Altimeter.
now what I want to do is know the exact elevation of my driveway so when I head out for a ride I can just manually set the altimeter,

The value displayed on the Garmin is a blend of GPS and manually set barometer data,

Which varies greatly from my GPS elevation displayed on my very old Magellan Explorist 600 (which might get a sat lock in 10 minutes) talking maybe 20m elevation difference.

So my plan is to find a know elevation point in the local area Hornsby / Waitara (Sydney NSW) and set my Garmin Edge 510 to this known elevation.
Then quickly go home and measure the elevation of my driveway and then I know what to calibrate it to every time i leave home.

hopefully of all that makes sense?

So the real question is, Does anyone know where I can find a list of known elevation points for the local area?

Cheers, Glad to see the site running good as ever and look forward to maybe getting back into some caching when my little girl gets big enough to venture out into the wild.

Regards Martin Gins
AKA GIN51E

User avatar
mtbikeroz
5000 or more caches found
5000 or more caches found
Posts: 823
Joined: 28 November 03 10:49 am
Location: Canberra, ACT

Re: Known Elevation points

Post by mtbikeroz » 18 May 13 4:50 pm

The NSW topo map. HORNSBY 91304S, NSW 25,000:1 has contour lines at 10 m intervals. OZI Explorer mapping software shows this map,so, looking at your Hornsby - Waitara area,

S 33 42.6051
E 151 06.1465

has an elevation of 190m.

User avatar
Browngang
2800 or more caches found
2800 or more caches found
Posts: 88
Joined: 14 February 11 1:43 pm
Location: Bonny Hills

Re: Known Elevation points

Post by Browngang » 18 May 13 9:15 pm

Go down to the seaside, midtide and press "calibrate" with the GPS at water level?

User avatar
Dik:
500 or more caches logged
500 or more caches logged
Posts: 370
Joined: 22 May 06 6:56 pm
Location: Adelaide SA Garmin 60CSx

Re: Known Elevation points

Post by Dik: » 19 May 13 9:39 am

Find your nearest accessible trig point. That will have a known elevation. It should be recorded on a toppo map.

User avatar
GIN51E
600 or more caches found
600 or more caches found
Posts: 774
Joined: 19 June 05 11:07 am
Location: Waitara Magellan Explorist 600

Re: Known Elevation points

Post by GIN51E » 19 May 13 10:43 am

Thanks guys I'll test them all out, only problem with the trigs is the 3 closest ones are all on top of buildings.

geo_jas
3000 or more caches found
3000 or more caches found
Posts: 148
Joined: 07 May 11 8:22 am
Location: Melbourne, Vic

Re: Known Elevation points

Post by geo_jas » 19 May 13 4:01 pm

Just saw this locationless cache. Maybe there's a location here that can help.
http://geocaching.com.au/cache/ga4411

User avatar
GIN51E
600 or more caches found
600 or more caches found
Posts: 774
Joined: 19 June 05 11:07 am
Location: Waitara Magellan Explorist 600

Re: Known Elevation points

Post by GIN51E » 22 May 13 8:00 pm

thanks geo_jas thats perfect, looks like they seem to be near sewage pumping stations, not the best places to hang out but looks like thats where i have to go.

User avatar
GIN51E
600 or more caches found
600 or more caches found
Posts: 774
Joined: 19 June 05 11:07 am
Location: Waitara Magellan Explorist 600

Re: Known Elevation points

Post by GIN51E » 23 May 13 9:04 pm

Thanks Geo_jas

your post got me thinking and a message to a mate
(who's dad has something to do with surveying)
I asked him to check with his dad if he knew where any AHD markers were in the local area.

Next thing i get an email with pictures and diagrams showing the end of my street.
Showing a state survey marker SS19412 only 10M from my Driveway showing a AHD71 168.421M
I think thats more than accurate enough for my needs.

Cheers guys for all the suggestions.

Case solved

Post Reply