nm7s9's diary

Recent diary entries

Golden Canyon Road - and Tiger 2007

Posted by nm7s9 on 25 October 2008 in English (English)

I've had problem sending to talk-us so I'll try to put the info here.

Again, let's calm down a little bit. Were you around for the last
import? Did you see how I handled data conflicts in that one? Was
there a problem there that needs fixing this time around?"

Yes I think there were problems. There have been some diary entries bemoaning the fact that their edits had been blown away by the Tiger data upload.

From my own experience I noticed some problems as well. My travels took me through my second most favourite place on earth - Death Valley. When I went to edit in the tracks I noticed that on Badwater road there were two roads (and still are).

One edited in by 80n and another uploaded Tiger one and both intertwined. Since then another mapper has made some improvements to the Tiger one although he has not yet removed the reviewed tag. I've also been slack in this respect but am in the process of fixing this.

More serious is the situation of Golden Canyon Road. I walked up this washway a small way (as you can see from my gps tracks) but didn't want to repeat the fatal decision of a German Tourist so I quickly went back to the car. This was in mid summer.

Google Earth readily shows the correct nature of the car park area and washway status.

80n has this tagged correctly as "footway" but Tiger declares it highway, residential, a most incorrect tagging, and dangerous as well.
Needless to say these two ways are intertwined as well. I haven't looked up the edit dates but I'll take a bet that 80n didn't edit in this footway and not realise that there was an incorrect residential way already mapped. I had already fixed up the other end of this track (at Zabriski Point) but had put the whole area in the too hard basket and decided that when I finally get my tracks all edited in, I would attempt to fix up Death Valley.

I had also noticed problems in San Francisco, where there were two Lombard Streets on top of each other, one with the squiggly bit straight. Fortunately someone has corrected this.
On a side note, I believe that the correct thing to do is to just delete the "Tiger reviewed" tag rather than turn it to "yes".
Is this correct?

I'm firmly convinced that automatic uploads should only go into areas where there are NO user edited nodes or ways. Other updates need to be done manully to avoid data corruption.


Black Allan Line

Posted by nm7s9 on 29 April 2008 in English (English)

I have just visited (and tagged) 6 points on the Black Allan line (The straight bit of the NSW Victoria border in Australia). By joining the dots up we now have a better approximation of a segment of a great circle that this border is supposed to be.

It also means that a bridge near Delegate (on Bonang Road) returns to its rightful place in NSW.

I hope that some intrepid OSM'ers will treck to the two endpoints of this line, since the current OSM co-ordinates seem to be about 200 metres SSW of the co-ordinates given by GeoScience Australia and Google Maps/Earth.

PS I then mapped the Bonang Road down to Orbost and I think that this may the twistyest road (of serious length) in Australia, maybe the world. You drive for weel over an hour and you are almost always turning the steering wheel.

Survey vs tracing

Posted by nm7s9 on 1 April 2008 in English (English)

I totally agree with netman55 about the problems with tracing from imagery.

To get the street names and even more importantly the "onewayness" of the street, you do actually have to drive the street.

As a bonus you can even start to populate the POI database , E.G toilets, parking areas, parks , hospitals, pharmacys, schools etc.

Map verification

Posted by nm7s9 on 6 November 2007 in English (English)

After having horror times in Monterey, California and Las Vegas due to the Teleatlas maps having so many errors regarding turn restrictions, I have concluded that each road needs to be driven three times.

Once by the mapper, to position it properky and name it correctly, and twice by independant verifiers.

Therefore in Canberra (Australia), when I see that a suburb looks complete, as far as road placement and naming is concerned, I will also drive it to check for possible mistakes or missing turn restrictions.

I've just made a couple of "improvments" to Hackett. I hope the mapper of this suburb is not offended. I've really got a bee in my bonnet about one way streets that are not marked as such. Even the Sensis maps of Australia are woeful in this respect.

I really hope that someone will check the areas that I have mapped. I would love for them to be error free.