Google Earth Community: Data Problems Compendium v 1049 November 19, 2008

Data Problems > Image Errors > Misalignments

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Recent high resolution updates to downtown metropolitan areas are generally well aligned. However, the suburbs are often left badly misaligned. See Amsterdam (Netherlands), Baghdad (Iraq), Belgrade (Serbia), Granada (Spain), Lima (Peru), Luxembourg City, Milan (Italy), Munich (Germany), Prague (Czech Republic), San Jose (Costa Rica), and San Salvador (El Salvador)

Africa Megaflyover
---- When high-resolution images are introduced behind an image from the "Africa Megaflyover" Featured Content layer, they are not jointly aligned. The photos were taken at significant angles, so they need orthorectification.
---- Where airport runways are located in the same images, they are diplayed, and they show that the problems are in the misalignment of the Megaflyover images, in locations, compass directions, and viewing angles. (Note the wedge-shaped area on the ground covered by the Flyover image because of its viewing angle, approximately 45°.)
Antarctic 644026 image-stretching in four areas of significant swaths: 35°-45°W, 51°-62°W, 146°-180°W, and 164°-180°E
Arctic
---- 617415 Canada, Ellesmere Island misaligned 10 kilometers
---- 617416 Denmark, Greenland, misaligned 15 - 30 kilometers
---- 617419 Norway, Svalbard, Nordaustlandet misaligned 12 kilometers
---- 617421 Russia, Franz Josef Land misaligned 12 kilometers
---- 617426 Russia, Ushakov Island misaligned 6 kilometers
---- 617424 Russia, Komsomolets Island, Severnaya Zemlya misaligned 10 kilometers
Australia
---- 617429 Adalaide misaligned 550 meters---- 617437 Brisbane misaligned 20 - 200+ meters. The area has too many overlaid images for analysis. We illustrate here the use of airport runways which are published to hundredths of a second

---- 617438 Gold Coast misaligned 200 meters: 1% FIXED in March 2007; 35% FIXED in June-July; the rest is NOT FIXED
---- 644193 Jervis Bay misaligned 80 meters west
Austria, Vienna misaligned various distances up to 30 meters.
Bahamas, Eleuthera Island misaligned 15 meters at north end (617539), 100 meters in center (617554), 400 meters in south end (617555), analyzed by comparing with airport runways.
Botswana, 4990 Ghanzi misaligned 1350 meters west
Brazil
---- 607979 Águas Lindas de Goiás 200 misaligned 200 meters west
---- 3267 Brasilia misaligned 200 meters northwest
---- 644068 Lauro de Freitas misaligned 90 meters east Partially Fixed
---- 664064 Salto de Cima misaligned 120 meters south
Canada
---- 6129 Kingston misaligned 50 meters east
---- 3635 Mount Hector misaligned 70 meters east
Denmark, We show examples of the many areas which use a unique stretching method to smooth misaligned adjacent images. The misalignments are sometimes 40+ meters, unusual for European high-resolution aerial imagery. Odense has a great array of such misalignments
France
---- Chaumont misaligned 100 meters southeast, 19 June 2007
---- Gacé misaligned 85 meters southeast, 26 June 2007
Hungary, 5298 Budapest misaligned 25 meters east
India, 617643 Southern India misalignments 100 to 300+ meters Some fixed 19 September 2007
Ireland
---- Sligo misaligned 20 meters east. Although this is not excessive, the Sligo Roads layer needs many updates (see THIS POSTING), so correcting this misalignment would assist in that effort.
Italy
---- 5353 Addolorata misaligned 40 meters east
---- 644203 San Benedetto del Tronto misaligned 400 meters west
Japan
---- Tokyo harbor image rotated 180º
Luxembourg
---- Bettendorf, 30 to 50 meters NE, noted 27 July 2007
---- 644070 Strassen, 334 meters SW
Mauritius, Agalega Islands misaligned 3.5 kilometers northwest.
Portugal, 617662 Paço de Arcos (suburban Lisbon) misaligned 40 meters
South Africa
---- 5079-80 Bloemfontein. Covers several significant misalignments -- Boyden Hill 847 m WSW (verified by Observatory correspondents), Bloemfontein airport 280 m NNW, Kelly's View 750 m SW, Kromdraai 277 WNW, and New Tempe airport 25 m ESE
---- 7394 George 30 m W misaligned
Spain
---- 641686 Agres misaligned 400 meters west
---- Granada suburbs misaligned 440 meters (compare with ROADS). Two new images were added April 2006 which corrected central Granada.
Switzerland
---- 4827 Basle misaligned 35 meters northwest
UK
---- 617727 Dundee misaligned 30+ meters
---- Leigh, double switchback misalignment

---- 617742 Slough misaligned 50 meters, though slightly smaller after October 2006 updates
USA
---- 777959 California, Sequoia & Kings Canyon park areas misaligned about 400 meters westward, creating also a duplicated image area on the eastern side, Partially Fixed 29 July 2007
---- California, Watsonville misaligned 70 meters SWS
---- Colorado, Aspen misaligned 50 meters SW
---- 3697 New Mexico, Santa Fe misaligned 400 m W
---- Nevada, Area 51 misaligned 350 meters.
---- New York-New Jersey image overlaps
---- 643988 Oklahoma, Tulsa misaligned 20 to 40 meters.
---- 644089 South Dakota, Beresford misaligned 20 meters southwest. The area had originally included Sioux Falls, but was reduced 27 July 2007
---- 643972 Tennessee, Oak Ridge misaligned 87 meters.
---- 617774 Texas, Plano misaligned 58 meters.
---- US Virgin Islands: Saint Croix (35 m W) and Saint Thomas (60 m W
---- Wyoming, Muddy Gap misaligned 420 meters west

Edited by PriceCollins (03/16/08 08:40 PM)

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