Max That's really helpful, thank you very much. The Beginner's guide was not joking when it said that this was a steep learning curve!!
Best Wishes Andrew On 14 January 2015 at 20:12, Max Bainrot <[email protected]> wrote: > Hi Andrew, > > On 14 Jan 2015 6:28 am, "Andrew Patterson" <[email protected]> wrote: > > > > I am just starting to do some plotting on task #591 - South Sudan > Crisis, Cholera outbreak in Juba, mapping with WorldView-2 - task 38 and > would welcome some checking and the answer to a couple of questions before > I do too much abortive work. The first question is, I guess, whether this > is the correct forum into which to place this request. > > Yup this is the right place a far as I know > > > > > In opening Task 38 I had assumed from the instructions that the preset > image would be Worldview-2, but I notice from the offset database to which > it is currently set that the name given is Digital Global - is this one and > the same. > > > > When I first started mapping I used iD editor and bling, which had a > very clear image from which I also digitised some areas that appeared to be > cultivated areas. Although not asked for, these areas did provide some > explanation for certain tracks. When I converted to JOSM as loaded, on one > occasion I moved the bling image to co-incide with my plotted items, and > adjusted the placing of these areas. Are both of these actions valid? > > To my understanding of the Sudan Juba task it doesn't say not to, and > agricultural places would suggest a presence of a water source. > > As for imagery I also found that iD editor was a bit difficult to get bing > imagery to work, in JOSM you may need to click the eye ball (on the bus ATM > so I can't check to describe the icon) > > What I have also found helpful is to use transparency to help align the > bing imagery to the worldview to the OSM data > > > > > Finally, the square that I am currently mapping was for the most part > empty, accept in the southern end where a number of tracks and buildings > had been entered at least 12 months ago. These do not appear to have been > on a particular offset, and are therefore considerably astray with the > offset that I am using. Am I justified in moving them, particularly in the > light of the instruction information about the update of imagery. > > > > If your confident that the astray items are the ones offset not the other > data then I would say its safe to do so. I also look at neighboring tiles > to be sure that your imagery is properly aligned > > One thing I forgot to do on the tile I was working on was I forgot to > check for GPS traces as they (particularly in numbers ) are ultimately the > golden source of truth. > > Though please note that I am very new to OSM and HOT so your milage on my > advice may vary :) > > Cheers > Max > -- Andrew Patterson The information contained in this e-mail and any files transmitted with it is confidential and intended for the addressee only.
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