Gerhardus Geldenhuis has commented on the following diary entries
|Quality of river mapping||10 months ago||
Thanks HeBri, the imagery you mention is the CD:NGI imagery I referred to.
|Severe flooding||11 months ago||
I agree that the normal river bank should be tagged and should be the one that gets displayed. However I believe OSM is about more than just a pretty map and a potentially very powerfull future data source and in that regard it would be useful to have more river bank information.
|JOSM||11 months ago||
Yes, I have already reached that step. I can't imagine why I have not done it sooner. I can't seem to convince JOSM to make multiple holes in a polygon, one yes but not multiple but I will figure it out. The caching of imagery means I can be a lot more productive, I have yet to figure out how to download all zoom levels for a chosen area.
I also love the display as it really clearly shows were I have been and what areas I am busy with. I have some suggestions for improvements but will live with the editor a little while longer before making them. Mainly it would be nice to have the frequently used tags be persistent after program restart and the ability to single click select the frequently set tags rather than the 3 clicks it currently takes.
|Dyke?||12 months ago||
Hi Alexz, The Vaal Barrage is still very much standing and is further east from the location we are discussing. It has 9m high sluice gates that can be lifted completely out of the water to let water through. 1996 was the only year that I saw all of the gates completely lifted out of the water. Normally if you lift one of the gates 2m it causes significant rise downstream and the police drive from resort to resort warning the fishermen. If you are lucky and get permission to go on the Barrage while they open a sluice gate you might sometimes see very big catfish swimming in the stream of water gushing out from underneath the sluice gate. They hover there to catch smaller fish that got sucked in.
Your comment about the impact crater reminded me that one of my friends has spend several weeks mapping parts of the crater close to the town of Parys. She is much more familiar with the geology and I have asked her for an expert opinion.
I have extended your trace slightly to the south east and added two more traces to the north east and south west of your trace for illustration purposes of other similar features.
|Dyke?||12 months ago||
Hmmm, I gave your suggestions serious consideration. I compared the Google Maps images, the South Africa CD:NGI Aerial and the Bing imagery to be sure. What convinces me that it is geological rather than the remains of a road or railway is the following: * It's only visible in the vicinity of the river, if it were a road or railway I would have expected it to be visible a lot further away from the river.
All that being said I would still be open to convincing otherwise. I do think it is rather academic at this stage as it is not worth mapping for OSM and would require a site visit to be sure. I will try and visit the location when I am in South Africa in January.