Spring,
Yes, the image shift by the JOSM "Imagery offset" button is not saved on
the server. It is only evident on the local computer. The Imagery Offset DB
is used to store offsets that should be used by others. It is a manual
process to check the Offset DB, to see if one applies in the area you a
Bing buys images from satellite operators, DigitalGlobe is a satellite
operator that is nice enough to release some images directly to us
occasionally and Kevin even does some mapping from time to time.
Since Bing does not have high resolution imagery for everywhere we map HOT
obtains images from
Hello Steve,
Thanks for that clarification, I think I get the distinctions. Are
you saying that the image shift is not saved, it is only evident on the
local computer? So other users would not see that change, is that
correct?
However, there is an image shift database which implies that the shi
OK, thanks Kevin. So someone not paying attention to this level of
detail might not actually know if they're using a Bing or DG
image? However, the word is to use Bing as the positional
standard. This sounds like a potential procedural problem. Then in
JOSM, if the layer list says Bing, the
Spring,
When I talk about "moving the imagery" that is only to align it with Bing
imagery as I work in a very localized area, in order to confirm that the
features are (roughly) correctly located, relative to Bing. It does not
change the geo-referencing of the underlying data for other users - it i
>>Does Digital Globe supply Bing images? Just curious, they are always
>>referred to as different products.
Yes, Microsoft licenses DigitalGlobe imagery for many parts of the world,
you’ll notice the attribution in the Bing Maps platform. In various threads,
I’ve seen Bing imagery “versus” Dig
From: Steve Bower [
mailto:sbo...@gmavt.net]
Sent: Thursday, May 07, 2015 10:49 AM
To: Milo van der Linden
Cc: Heather Leson;
i...@hotosm.org; Ross Taylor;
HOT@OSM (Humanitarian OpenStreetMap Team)
Subject: Re: [HOT] [info-hotosm] Reference Project #1030 Nepal
Earthquake
Â
Springfield,
Y
Hi Kevin,
Thanks for
your reply. Interesting perspectives on a new (to me) GIS
culture.
In JOSM, I
noticed that although the Bing air photo layer was turned on, the photo
itself was labeled Digital Globe. Does Digital Globe supply Bing
images? Just curious, they are always refe
>>it still concerns me that untrained users can move the imagery around at a
>>whim
completely agreed; not only in this Nepal activation but for all OpenStreetMap
work!
>>Perhaps a lower cutoff angle could be adopted to filter out images of high
>>distortion and displacement.
this is our typi
lt/files/WorldView_Geolocation_Accuracy.pdf
> [4] - http://www.satimagingcorp.com/services/orthorectification/
>
> *From:* Steve Bower [ mailto:sbo...@gmavt.net ]
> *Sent:* Thursday, May 07, 2015 10:49 AM
> *To:* Milo van der Linden
> *Cc:* Heather Leson; i...@hotosm.org; Ross
Team)
Subject: Re: [HOT] [info-hotosm] Reference Project #1030 Nepal
Earthquake
Springfield,
You raise important points, and are not "raining on a parade".
The resulting data will not be suitable for all purposes, but it can be
very useful for this crisis response.
I do think there is
van der Linden
Cc: Heather Leson; i...@hotosm.org; Ross Taylor; HOT@OSM (Humanitarian
OpenStreetMap Team)
Subject: Re: [HOT] [info-hotosm] Reference Project #1030 Nepal Earthquake
Springfield,
You raise important points, and are not "raining on a parade". The resulting
data will not be su
Springfield,
You raise important points, and are not "raining on a parade". The
resulting data will not be suitable for all purposes, but it can be very
useful for this crisis response.
I do think there is significant risk that some mappers will map directly
from un-rectified imagery, and introduc
Hello Springfield Harrison,
As a 20 year GIS veteran I understand what you say. I do agree that in
communication with first responders it is important to have them clearly
understand that the accuracy of features can be off ~100m. But for them
having maps that give a good indication is way better
On 7 May 2015 at 10:21, Springfield Harrison wrote:
> Having untrained users realign the imagery willy-nilly is amazing to me.
Usually we don't.
This is crisis response and hence crisis-GIS.
We are striving to produce useful and good enough data, not perfect data.
We are working with multiple pa
Hello Steve,
Sorry to
rain on the parade yet again but I find this matter of image alignment to
be puzzling and concerning.
One of the
first things I learned when embarking upon GIS/GPS mapping was that
accurate georeferencing of all layers, but especially the base layers
(imagery
Ross - If you haven't already, see the recent threads on "data alignment to
satellite imagery" and "imagery alignment", in the archives for May:
https://lists.openstreetmap.org/pipermail/hot/2015-May/thread.html
Note some links pointed out there by althio:
http://wiki.openstreetmap.org/wiki/Usin
I don't think Chad's IDP guidance document (though very helpful) addresses
the issue of spatial accuracy of the DG imagery, raised by Ross. I'm going
to post that as a separate issue with more detail.
On Wed, May 6, 2015 at 4:35 AM, Heather Leson
wrote:
> HI Ross, sorry for my delayed response.
HI Ross, sorry for my delayed response. It is best if you ask your
questions on the main Hot@openstreetmap.org mailing list.
Chad provided this guidance document on IDPs
http://hotosm.github.io/tracing-guides/guide/Nepal.html#IDP%20Collection%20Guidance
Hope this helps
Heather
On Tue, May 5, 20
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