Overpass queries offer great possibilities to extract layers of data directly
in QGIS or JOSM.
But you need to know how to write the queries. You should connect to the Live
#hot irc channel and discuss with experienced HOT contributors.
https://kiwiirc.com/client/irc.oftc.net/hot
They will provide you some examples and explain the plugins to add either to
QGIS or JOSM.
regar
Pierre
De : Phil (The Geek) Wyatt <[email protected]>
À : 'Springfield Harrison' <[email protected]>; 'Michael'
<[email protected]>; 'HOT' <[email protected]>
Envoyé le : Lundi 11 mai 2015 2h42
Objet : Re: [HOT] QGIS and OSM and..
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div.yiv3849233296WordSection1 {}#yiv3849233296 From: Springfield Harrison
[mailto:[email protected]]
Sent: Monday, 11 May 2015 3:43 PM
To: Michael; 'HOT'
Subject: Re: [HOT] QGIS and OSM and.. Hello Michael,
Thanks for your reply.
So you are confirming that downloading OSM data through JSOM is a waste of
time? I wish I had known this earlier. I was advised that it would download
all of Nepal but that doesn't seem to be the case. JOSM is really just an
editor for doing small area changes to OSM data - its not designed for country
editing. QGIS however, can download any area in the world (subject to your
bandwidth and hard disc size)
I tried the open street map data link that you provided. It shows some promise
but I haven't looked at the data yet. [Just looked at some of those
shapefiles, they do load and display in QGIS. However, when I tried to change
the symbology for the helipads, they all disappeared. WTF?] OK - thats likely
a QGIS issue - nothing to do with OSM
I also stumbled upon the HOT Export site. It is very convoluted but also shows
promise once one figures out the myriad of options. Creating presets would be
helped enormously if there were drop-down lists for the keys and their values.
My last attempt here failed, probably due to bad capitalization or some such.
It looks like a dog's breakfast.
Now I see your reference to Overpass Turbo, hopefully not another blind alley.
Simply downloading data in OSM is anything but streamlined. The key/value
concept seems to complicate things considerably. What is the benefit of that
system?
I have fired up Overpass Turbo. Used the wizard to create and run a query but
the export options only offers some less than useful choices. GPX and KML
files are of limited use in a GIS and I don't recognize any of the other files.
The geojson file was only recognized by QGIS but it would not display. Make
sure JOSN is running (with remote control turned on) and then use the Overpass
turbo export "load data into an OSM editor: JOSM,Level0". Then in JOSN you can
edit away as required
Then I tried the KML and GPX files. I'm QGIS the KML file was listed but not
accepted for viewing; the GPX layers were accepted but would not display. In
JSON the KML file was not recognized and GPX file would not display. Most of
this sounds like QGIS issues/familiarity not OSM issues.
If I recall correctly, the option to send the query results directly to JSON
failed also.
This is a huge amount of trial and error with very little, almost nothing, to
show for two late nights. I appreciate everyone's attempt to help, and have
read many wiki pages but she's all uphill.
My intention is very simple -· download a shapefile of the Nepal task
tiles· download a shapefile of the potential and actual helipads [this
might have been achieved with the Hot Export, the many attempts are all
blurring together now]· possibly download a shapefile of other features
The question here is "what do you want to do with the data after you have it?"
We can suggest the best tools if we know what the whole job actually is. I have
sent you a KML file of Leisure=common sites (around 1400 potential helipad
sites) that you could use in Google Earth (as you previously mentioned that it
would help you define better landing sites). I have also suggested how you can
then edit them again via OSM. There is not a quick process to take masses of
data out of OSM, edit it offline, and then reimport it with validation
...especially whilst there are so many folks editing during an activation. If
someone can outline a GUARANTEED process to achieve that I would be most
appreciative. In most GIS environments, these are everyday activities
accomplished with a few mouse clicks. In many years, I don't think I have ever
seen such a complex mishmash of GIS tools. Yep, each set of tools and
software have their uses, foibles and learning curve - personally I use
Mapinfo, QGIS, FME, OSM, JOSM Editor, ID Editor, Google Earth, Oziexplorer,
Mapsource, Basecamp and occasionally even ESRI products (even Manifold years
ago!). Sometimes a combination of tools gives the best result.
Thanks very much, Cheers . . . . . . . . Spring Harrison
At 10-05-2015 10:33 Sunday, Michael wrote:
Hi Spring,
Am 10.05.2015 um 10:47 schrieb Springfield Harrison:
Further bad news, trying to download OSM through JOSM yielded the following
message:
/The OSM server 'api.openstreetmap.org' reported a bad request.
The area you tried to download is too big or your request was too large.
Either request a smaller area or use an export file provided by the OSM
community.
I am afraid but this is standard behavior in any editor. Basically this is not
the way to go if you actually want to download OSM data for consumption.
/Does this process usually work? Is it not possible to simply get a shapefile
of this information and avoid all the multiple file type rigmarole?
If you actually want a shapefile for all of Nepal I would recommend using one
of the available downloads listed on
https://wiki.openstreetmap.org/wiki/2015_Nepal_earthquake#Exporting_OpenStreetMap_data
But if you are only interested in some feature you should have a look at
Overpass Turbo. This allows to download filtered results.
http://overpass-turbo.eu/s/9hb is a sample query for aeroway=helipad in the
area showed in the map. But unfortunately this will not yield shapefiles. Also
the query language requires to go through some learning curve if you want to
create a bit more complex queries.
Cheers,
Michael (user Ohr)
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