I would switch it: Map buildings (and maybe residential areas) first and
then roads. Buildings or residential areas help mapping roads (if a road
is a track or unclassified) while roads are no help when mapping buildings.
Am 26.02.2017 um 03:36 schrieb Vao Matua:
John,
I think there is merit to what you are saying.
The one caution I would suggest is that "If something is worth mapping
it is worth mapping correctly". Here in Ethiopia I have spent a lot
of time adding nodes to roads that were digitized at a coarse scale.
Mapping quickly doesn't have to be done crudely.
There is no troupe of magic mapping elves that clean up the rough
mapping.
The next set of HOT projects I will set up will be roads/highways only
and then buildings only.
Keep mapping,
Emmor
On Sun, Feb 26, 2017 at 1:16 AM, john whelan <jwhelan0...@gmail.com
<mailto:jwhelan0...@gmail.com>> wrote:
Just an ideal thought. It came about as I'm loading in bits of
Nigeria by the enamel bucket at the moment then looking for
untagged ways and crossing highways.
What stands out are blocks where every track and settlement is
mapped and blank bits of the map. I've been attempting to join
bits of highway together to reduce the islands.
Projects that ask for buildings are different but for projects
where we are looking to map settlements and connecting highways if
we omitted the paths and tracks leading to fields and rivers and
mapped say two or three highways max to a cluster of three huts we
might be able to get rid of some of the large gaps in the map and
unless someone can think of a reason why tracks and paths leading
to fields are essential I think many NGOs could manage without.
In return we could make more settlements and highways available in
the same time frame.
Part of the problem is each project is looked at separately. Each
project manager only thinks in terms of their own project rather
than in terms of how much resources are available overall. I am
aware that some organisations feel they are independent having
their own mapathons but to get the quality up you need validation
and if you don't believe me just have a look at the map after a
mapathon. Nigeria is full of settlements wrongly tagged,
building=residential or yes are amongst the most common incorrect
tagging. A number of small villages have been interconnected with
highway=primary etc. Crossing ways by the hundred.
I don't know how you would write the instructions for a such a
project but it might help the projects get completed more
quickly. I heard an off the cuff remark about a project recently,
"It'll take a year at that level of detail.". Off the cuff
comments are more gut feel than accurate but there was an element
of truth in the remark and I had the feeling the data was desired
within a month or two. I would suggest if you want the mapping
done quickly reduce the scope a little.
Thoughts?
Thanks John
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