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 is only revising it for my display. I expect that how you understood it, but in case that wasn't clear.
I haven't personally digitized anything from the DG imagery. I have only used it to help with interpretation where the Bing imagery is poor (low res or cloudy). But others may be locating features from the DG imagery - hopefully only experienced mappers with careful reference to better geo-rectified imagery ("hopefully" being the aspect that gives us all concern, of course). I fully agree this is not "best practice" for digital mapping - it's "best available" within resource constraints for crisis response. By the way, you may already be very familiar with this, but the elevation aspect of ortho-rectification is described here (see image at top-right): http://en.wikipedia.org/wiki/Orthophoto. Or see the first image in this page: http://www.kevinroper.org/portfolio/ . These explain why the more severe off-nadir angle causes greater location distortion, more difficult to correct for. On Sat, May 9, 2015 at 10:30 AM, Kevin Bullock <kbull...@digitalglobe.com> wrote: > >>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” DigitalGlobe imagery, and that is > usually a contradiction. The proper way of characterizing it is: > DigitalGlobe imagery through the Bing platform versus DigitalGlobe imagery > being made available during this crisis. > https://www.digitalglobe.com/partners/platform-partners/microsoft > > Cheers, Kevin > > > This electronic communication and any attachments may contain confidential > and proprietary information of DigitalGlobe, Inc. If you are not the > intended recipient, or an agent or employee responsible for delivering this > communication to the intended recipient, or if you have received this > communication in error, please do not print, copy, retransmit, disseminate > or otherwise use the information. Please indicate to the sender that you > have received this communication in error, and delete the copy you received. > > DigitalGlobe reserves the right to monitor any electronic communication > sent or received by its employees, agents or representatives. >
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