Samcdc
Tourist
Reged: 08/01/06
Posts: 26
Loc: Campos, Rio de Janeiro - Brazi...
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Look another data problem found in Cabo Frio-RJ Brazil.
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PriceCollins
Inspector Detector
Reged: 08/10/05
Posts: 1597
Loc: Fairfax, VA, USA
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Data Problems > Image Blemishes > Discolorations
The Compendium Table of Contents contains a single network link which enables you to download the latest version of the entire Compendium in a single file of about 1.1 megabytes.
____________________
All of these blemishes are in the DigitalGlobe high-resolution imagery.
- Overexposure (or saturation or whiteout) These are discussed in THIS POSTING.
---- Egypt: Cairo West airport 23 October 2006 and 5 other airports
 overexposure
- Sapphire terrain images display shining blue terrain or water areas. It is not known whether thay are caused by a camera or post-processing problem. While apparently not common, they cause enough user questions to warrant a separate collection.
---- Australia: Juna Downs, 21 September 2006
---- Bolivia: Uyuni, 9 January 2007
---- Chad: various
---- China: Xinjiang, 13 September 2006
---- Saudi Arabia: Mecca region, 8 August 2006
---- USA: Devil's Slide, Pacifica, CA, 15 October 2005
- Red-blue swaths are generally in an east-west direction and may be a misalignment of camera color image layers. We show examples in China, Cyprus, Russia, and the UAE.
---- Antarctica: 23 June 2007, with 2 smaller missing areas
---- China: Kinjiang-Uygur
---- Cyprus: Morphou
---- Germany: Hunoldstal colored swath, 12 August 2007
---- Oman: Huwl (per sasroodkapje)
---- Russia: 1 (12 October 2006), 2 (15 October 2006), 3 (24 October 2006), 4 (24 October 2006), 5 (24 October 2006), 6 (28 October 2006), 7 (28 October 2006), 8 (20 December 2006), 9 (per sasroodkapje), and 10 (22 March 2007).
---- UAE: Kahwr Fakkan (per sasroodkapje) and Nahwa 28 October 2006
- Strange colors are miscellaneous discolorations.
Argentina:
---- Panaholma strange rectangle, not discolored in Microsoft's Live Search or Yahoo Maps
China:
---- Inner Mongolia, 5 October 2006
Ecuador:
---- Galapagos, Isla Fernandina, 29 December 2006, and Isla Isabela, 22 July 2007
UK:
---- odd color patches in Southall Green 23 January 2007
USA:
---- Carson City, Nevada: peculiar image color, 14 April 2007
---- Phoenix, Maryland: red woods and odd target, 13 March 2007
Edited by PriceCollins (08/14/07 01:13 PM)
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Rick_Spanbauer
Tourist
Reged: 09/24/06
Posts: 2
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I am a bit curious about the statement:
---------------------
---- New York GIS censorship:
The high resolution imagery is supplied by the NY State GIS agency. The censorship appears to be selected by the counties, because they vary greatly in criteria. Westchester County continues to be the most highly censored, followed closely by Long Island. We have significantly expanded our analysis upstate and in Long Island after the September 2006 image upgrades. Most of the blurred Hudson Valley locations were located by psylant. Note the 7-by-7 mile size of the West Point Academy forest blurring in Orange County. Orange County has not blurred some locations - they simply "paint" them in white.
--------------------------
The context this comes up in is what seems to be inconsistent
policy on "blurring" what someone dubbed sensitive areas. For example,
in the Long Island area, the major airports serving the NYC area
(KJFK, KLGA, KEWR) don't seem to be blurred, but incredibly, Islip
airport is blurred. I'm a pilot and fly into/out of Islip all the time, so
it is one particular bit of imagery I happen to keep an eye on. At times,
the airport image is sharp and clear, then other times, like now, seems
like the image is very carefully retouched with a blurring filter that
aligns with the boundary roads around the airport. In other words,
something done intentionally rather than just swapping out one
quad for another during an update. So I went looking, and found the
statement above, ie about "NY GIS" having a hand in this. Questions:
1) Anyone know who "NY GIS" is?
2) Are they in fact responsible?
3) How is policy made?
4) Is there public access to the policymaking process and/or body?
Another area that seems to get the occasional "blur" is Port Jeff, near
the ferry terminals. One day, sharp image, next day, the slight of hand
blurring things  I live in PJ, things aren't blurry here on the ground.
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PriceCollins
Inspector Detector
Reged: 08/10/05
Posts: 1597
Loc: Fairfax, VA, USA
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Rick_Spanbauer,
The New York State GIS agency which has provided much of the high-resolution imagery for the state can be accessed on THIS WEB PAGE. That link has now been added to the Censorship listing. Your questions about their criteria, processes, etc. should be addressed to them.
Google makes the business decisions as to which vendors to select for given image areas. They use Sanborn Map Company for the New York City area, a firm which does not seem to censor; hence, the clear images for the three NYC airports.
We have tried to carefully outline the censored areas, so be sure to download the file when looking at specific areas. For example, only the Bridgeport ferry dock area is censored in Port Jefferson, so looking at other areas of the town would not show the blurring. The images are not updated frequently, and certainly not interactively from day to day.
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Rick_Spanbauer
Tourist
Reged: 09/24/06
Posts: 2
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So NY GIS is at the other end of the food chain, ie NY GIS commissioned
the camera ship, then in turn supplied the imagery to Digital Globe, who
in turn sells it to GE? I'd really like to follow the food chain here.
I submitted an order to Digital Globe for the affected areas to see if
their imagery is also blurred.
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MikePotterfield
First Post
Reged: 09/26/06
Posts: 1
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All of the beaches for all of the Hawaiian Islands are shown in 3-D as being way below sea level. This is a new problem.
--Mike
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PriceCollins
Inspector Detector
Reged: 08/10/05
Posts: 1597
Loc: Fairfax, VA, USA
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A brief check around the shores of Oahu does not show the problem. Can you provide a placemark or latitude-longitude ?
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Koramsah
Tourist
Reged: 10/28/05
Posts: 6
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The latitude of several of the image frames I've looked at in South Korea are off by a second. For instance, the Seoul Tower is georeferenced 1 second, or 35 meters, farther north than it actually is.
I have a question. Google Earth acquires most of its imagry from Digital Glode. Is it already georefenced when the get it, or does the Google Earth team georefence it themselves?
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PriceCollins
Inspector Detector
Reged: 08/10/05
Posts: 1597
Loc: Fairfax, VA, USA
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Koramsah,
30 meters or so is the typical accuracy for placement of DigitalGlobe images. This statement is based on a large collection of misalignment reports in THIS POSTING.
If you turn on the "Digital Globe coverage" layers and follow the links on their popup bubbles, you will see that the images are given with latitude and longitude to 5 decimal digits. That may or may not be the accuracy ot the data which is provided to Google by DG with such images.
I am not aware if the procedures and personnel staff for image placement have been described.
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JoseGil
Tourist
Reged: 07/20/06
Posts: 39
Loc: Barcelona
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Hi,
30 meters or so is the typical accuracy for placement of DigitalGlobe?? 
I've tested it in the Port of Barcelona and the accuracy is about 20-50 cm.
Jose
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