OpenStreetMap
I've always wondered what this was for. ;)
In the past couple of weeks I have been uploading a lot of tracks. The thing is they're of the same general area and mostly of places that have already been mapped. I wonder if it's of any use.
I have found out that I need to keep "wrap when full" unmarked on the Garmin Legend eTrex Vista HCx so that it will continually save track data on my miniSD card even after I reach the internal memory limit for tracks.
I wonder when I'll be done doing POIs of Marikina? Mandaluyong is also waiting. :)
Discussion
Comment from seav on 12 June 2010 at 04:02
Tracks of already mapped areas? They're useful in many ways. Here's a couple: they can provide independent proof about the location of roads, and people can mine the data for speed analysis. :-)
Comment from Anna_AG on 14 June 2010 at 20:11
The Garmin Legend HCX ( and I guess the Vista is identical ) when fitted with an internal SD card will log up to a maximum of 10000 points in internal memory ( just under 3 hours at 1 second logging intervals ). The Legend also caches to the SD card, but with a 500MB / 1GB card caching is essentially unlimited as 24 hours generates a GPX file of about 10MB, thus a 1MB card can hold several thousand hours of caching, even at 1 second intervals.
When the internal memory is full, the SD card GPX file will still be made. When downloading from the Garmin for editing in JOSM, ( I use GPSBabel ) I ignore the tracks in internal memory, and only use the Waypoints. For the tracks I simply switch the Legend into USB mode and drag the GPX files from the top folder into JOSM.
To upload multiple GPX files of the same area, I drag them all into JOSM, merge the layers into one, and if necessary use the GPXedit plugin to tidy up poor or inaccurate tracks ( perhaps due to first switch on, highly built up areas or more usually areas of thousands of points because I left the unit on overnight ).
The resultant GPX file, a compilation of usually many days can then be uploaded in one attempt, which can be quite useful.
Cheers Bri
Comment from linuxbastard on 16 June 2010 at 02:24
@seav - good to know that they aren't going to waste. ;)
@bri g - Thanks a lot for this. Didn't think about merging multiple tracks. Lacking in training (BWAHAHAHA @maning @ seav). Will prolly do this from now on. Yep, I've left the borrowed unit I have turned on and doing tracks overnight one time and found I've got point clouds around our street.