Home PageFacebookRSS News Feed
PocketGPS
Web
Read the current newsletter! Weekly
Newsletter
SatNav,GPS,Navigation
Pocket GPS World - SatNavs | GPS | Speed Cameras: Forums

Pocket GPS World :: View topic - Self scanned map calibration
 Forum FAQForum FAQ   SearchSearch   UsergroupsUsergroups   ProfileProfile   Log in for private messagesLog in for private messages   Log inLog in 

Self scanned map calibration

 
Post new topic   Reply to topic    Pocket GPS World Forum Index -> Memory-Map
View previous topic :: View next topic  
Author Message
Oldie
Pocket GPS Moderator
Pocket GPS Moderator


Joined: 22/11/2002 13:33:48
Posts: 992
Location: Surrey, UK

PostPosted: Sat May 29, 2004 2:28 pm    Post subject: Self scanned map calibration Reply with quote

Before going on holiday to the Greek island Samos I scanned a walk map, calibrated it by matching three locations with those on the Garmin MapSource World map. Next I set up four routes and exported them to my Garmin eTrex Legend.

I realise that this was all very approximate, but my intention was to record the tracks that I walked and then recalibrate my map when I got back home. To my great surprise the start point of my first walk was spot on :D. However, it was the only point that was correct Sad so I could not use my pre-planned routes to guide me. This was a pity, especially when lost Exclamation Really I was not lost as I knew my position to 4 decimal places, but that is of no help when trying to find the right track to follow. At one time I knew that, as the crow flies, I was just 1 mile from Vourliotes but I could not see how to get there. Luckily some German walkers coming from Vourliotes put me on the right track Thumbs Up

Back home I have been adding my tracks to three different scanned maps of the area that I walked and I am disappointed with the match that I have achieved.

Does anyone know how MMN 3.1.6 calculates the transformation when more than 3 calibration points are used. My GPS points are WGS84, the paper maps are an unknown quantity, although one of them (a road map) does have a grid with lat/long values. The road map gives me the best match, but I have to use the MMN WGS84 datum shift values, both N and E, to achieve a good match.
Back to top
View user's profile Send private message Send e-mail Visit poster's website







Posted: Today    Post subject: Pocket GPS Advertising

Back to top
Display posts from previous:   
Post new topic   Reply to topic    Pocket GPS World Forum Index -> Memory-Map All times are GMT + 1 Hour
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

Powered by phpBB 2.0.11 © 2001 phpBB Group
phpBB port v2.1 based on Tom Nitzschner's phpbb2.0.6 upgraded to phpBB 2.0.4 standalone was developed and tested by:
ArtificialIntel, ChatServ, mikem,
sixonetonoffun and Paul Laudanski (aka Zhen-Xjell).

Version 2.1 by Nuke Cops 2003 http://www.nukecops.com

Make a Donation



CamerAlert Database

Click here for the PocketGPSWorld.com Speed Camera Database

Download Speed Camera Database
20.082 (10 Aug 22)



WORLDWIDE SPEED CAMERA SPOTTERS WANTED!

Click here to submit camera positions to the PocketGPSWorld.com Speed Camera Database


12mth Subscriber memberships awarded every week for verified new camera reports!

Submit Speed Camera Locations Now


CamerAlert Apps



iOS QR Code






Android QR Code







Terms & Privacy


GPS Shopping