I've done a lot of validation in HOT. Some is done by people with
little experience so I don't think validated tiles would be much use to
you. Also be aware that some imagery can be three years out of date so
the imagery can vary. The sort of problems you'll run into are much of
the HOT mapping is done by inexperienced mappers using iD and the
buildings are more approximate than you might like especially on size
and shape. It takes four times longer to correct a building than to
remap it so as a rule of thumb validators tend to stay away from
projects with buildings.
Having said that have a look at the hot projects for one that is 100%
complete and 100% validated. You should be able to work out the
coordinates from the project and if you are lucky it should also give
you the imagery used when mapping for HOT. Beware this OpenStreetMap
and some mapping may have taken place on the ground showing buildings
etc that are not on the image.
You might be better off working with an experienced mapper who can both
map and check the sources. They should also check for duplicates, there
are tools available. I suggest an area that hasn't been mapped before
and map it correctly with an experienced mapper using JOSM and things
like the building_tool plugin.
If you're just trying the algorithm out Ottawa in Canada has accurate
buildings in OpenStreetMap.
Have fun
Cheerio John
Georgy Potapov wrote on 2018-11-20 9:25 AM:
Dear John,
the question isn't about imports. Seems guys are preparing dataset to
train and test models and they need to download data that's been
already validated within Missing Maps, as a "ground truth".
Is there a way to get the precise coordinates of the areas where this
job is done or projected to be done?
Me too was asking if it makes sense to apply algorithm to detect
damaged buildings on imagery to leverage the mapping speed in disaster
affected areas?
All the best,
Georgy
On Tue, Nov 20, 2018 at 3:29 PM john whelan <[email protected]
<mailto:[email protected]>> wrote:
Essentially you are proposing an import. There are OpenStreetMap
rules about how this should be done. It can be done, Microsoft has
released building outlines for the US which were created in this
manner but the import itself is being done in sections by
conventional mappers.
You will need the cooperation of the local mappers on the ground
and imports of dubious quality tend to get a fair chunk of flack.
I would suggest you Google OSM imports before doing anything.
Cheerio John
On Mon, 19 Nov 2018, 10:47 pm Serkan Karakulak <[email protected]
<mailto:[email protected]> wrote:
Hi,
I am a graduate student in a Data Science program, and I
wanted to get in touch with you because me and my two other
friends are interested in working on a machine learning
project to map areas using their satellite images and produce
their labels. If we obtain a high accuracy, we thought it
could be of use to the hotosm and the missingmaps initiatives.
I have first heard about Missing Maps when I came across a
mapathlon event two years ago in Istanbul. We were in search
for a class project for one of our courses and I remembered
about the mapathlon event and we would be very happy if we
could contribute to the this wonderful initiative. There are
already some previous successful works on this subject, so we
are very hopeful that we could come up with an algorithm with
high accuracy.
In order to develop the model, we need to extract bounding
boxes of the validated tiles we see at hotosm. Then we will
extract the satellite images and their labels using the
label-maker API which is developed by DevSeed. Is there a
method to extract the coordinates of these validated tiles?
Thank you for your time and help.
Best,
Serkan
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