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Archive for December, 2006

Satellite Views of Ancient Observatories

Friday, December 15th, 2006

Satellite Imaging is happy to release views of ten ancient observatories from its collection of IKONOS Satellite images. The locations shown are ancient temples, observatories, and gathering places of civilizations long gone, taken from the IKONOS satellite sensor.

Following are brief descriptions and thumbnail photographs of each observatory site. Click the thumbnails or the More information links to read additional information and see a full size, high-resolution photograph of each site.

Angkor Wat – Cambodia

Angkor Wat

Created as a constant reminder of a greater cosmic order, Angkor Wat shows several apparent solar alignments with a nearby mountaintop shrine. More on Angkor Wat

Casa Rinconada – New Mexico, United States

Casa Rinconada

Casa Rinconada, built between 1070 and 1110 AD, sits on an isolated hill about one-half mile across the canyon from Pueblo Bonito. One of the six great community kivas in the area, the structure is about 20 meters across and four to five meters deep. A 1970s survey of the area found this site to have precise solstice and equinox alignments. The main axis of the kiva is aligned through doorways on both the north and south sides. Modeled on a perfect circle, niches in the interior form an east-west line. Scientists who measured the alignments of these features found the accuracy of the north-south alignment to be within 45 arc-seconds or three-quarter of a degree while the error in the east-west alignment is only eight arc-seconds. Solar alignments occur on the winter and summer solstices when sunlight entering the kiva falls upon one of six irregular niches. From a given niche, the sun framed in the narrow window could be seen. GeoEye’s IKONOS satellite took this image of Casa Rinconada in Chaco Canyon on September 7, 2004. Photo credit: GeoEye

Chankillo — Peru

Satellite Image - Chankillo, Peru

About 400 kilometers (250 miles) north of Lima, Peru, lies an enigmatic, 2,300-year-old observatory named Chankillo on January 13, 2002, the central complex appears in the upper left with its concentric rings of fortified walls. The Thirteen Towers (Southeast of the central complex) were the key to the scientist’s conclusion that the site was a solar observatory. These regularly spaced towers line up along a hill, separated by about 5 meters (16 feet). The towers are easily seen from Chankillo’s central complex, but the views of these towers from the eastern and western observing points are especially illuminating. Although the dark shapes in the northeast seem like rock outcrops, they are actually trees. These viewpoints are situated so that, on the winter and summer solstices, the sunrises and sunsets line up with the towers at either end of the line. Other solar events, such as the rising and setting of the Sun at the mid-points between the solstices, were aligned with different towers. Photo credit: GeoEye

Chichen Itza — Mexico

Satellite Photo - Chichen Itza, Mexico

In a spectacular show of shadow and light, a shadow representing the Feathered Serpent god Kukulkan slides down the northern stairway of Chichen Itza during sunset of the equinoxes and then vanishes. The square, stepped pyramid, built by Mayans in about 1000 to 1200 AD also has axes that orient with the rising point of the sun at the summer solstice and setting point during the winter solstice. Many think the pyramid also serves as a calendar. Each of the four faces of the pyramid has a stairway with 91 steps. With the addition of a shared step forming a platform at the top, this totals 365, the number of days in a year. The stairways also divide the nine terraces on each side into 18 segments, representing the 18 months of the Mayan calendar. GeoEye’s IKONOS satellite took this image of Chichen Itza on March 5, 2001. Photo credit: GeoEye

Dzibilchaltun — Mexico

Satellite Picture - Dzibilchaltun, Mexico

The highlight of Dzibilchaltun, or “Place of Stone Writing,” is watching the equinox sunrise through a door of the Temple of Seven Dolls. The Mayan city, first built in 300 BC, was occupied when Spaniards discovered the city. GeoEye’s IKONOS satellite took this image of Dzibilchaltun on February 17, 2001. Photo credit: GeoEye

Easter Island — Chile

Satellite Image - Easter Island, Chile

Called the Navel of the World, Easter Island is home to over a half-dozen volcanoes and more than 880 statues called moai (pronounced mo-eye). Ranging from just a few feet to more than 30 feet tall, the enigmatic statues weigh up to 150 tons. They were hewn from volcanic material from quarries on the slopes of the Rano Raraku volcano sometime after 300 AD. While nearly all of the moai face toward the interior of the island, seven moai at Aku Akivi, not shown in the image, face towards the ocean and a point on the horizon where the sun sets during the equinox. Explorer, Captain James Cook gave the island its modern name in 1774. GeoEye’s IKONOS satellite took this image of eastern Easter Island on December 6, 2003. Photo credit: GeoEye

Machu Picchu — Peru

Satellite Images - Machu Picchu, Peru

One of the most famous Incan cities in the world, sun alignments are found throughout Machu Picchu. Many features, including the Sacred Plaza, The Temple of Three Windows and The Intihuatana platform, align with the summer solstice azimuth of 65-245 degrees. Scientists believe these alignments were primary considerations in the construction of the shrines. A shaft of light, shining through an east-facing window, reportedly illuminates The Torreon, or Temple of the Sun, during the summer solstice. The city was built between 1460 and 1470 AD at an altitude of 8,000 feet. GeoEye’s IKONOS satellite took this image of Machu Picchu on September 8, 2003. Photo credit: GeoEye

Mayapan — Mexico

Aerial Photography - Mayapan, Mexico

Mayapan, reaching its zenith around 1200 AD, represents one of the largest assemblages of Mayan ruins in the Yucatan and is one of the few walled Mayan cities. The largest pyramid is the Castle of Kukulkan, made as a smaller replica of the Castle of Chichen Itza. Mayapan also is home to many circular buildings, or observatories. The Mayas astronomical knowledge helped them predict the exact time of solar and planetary events and aided in the creation of precise calendars.

GeoEye’s IKONOS satellite took this image of Mayapan on September 19, 2001. Photo credit: GeoEye

Stonehenge — United Kingdom

Satellite Image - Stonehenge, England

Possibly the world’s most recognized ancient observatory, Stonehenge’s ring of stones was built more than 5000 years ago on a wind-swept hill near Salisbury, United Kingdom. Recent theories support construction in about 2000 BC by a late Neolithic people known as the Beakers. Their addition to the project included adding a double ring of stones inside the original earthen henge. More than 80 “bluestones,” some weighing up to four tons, were transported several hundred miles from quarries in Wales. Controversy surrounds some of the possible stellar alignments at Stonehenge, but on the longest day of the year, the summer solstice, the rising sun does appear behind the “Heel Stone.” As the sun rises, the shadow cast by the Heel Stone creeps up the length of rock and into the heart of the five interior “sarsen” pillar stones. GeoEye’s IKONOS satellite took this image of Stonehenge on March 27, 2002. Photo credit: GeoEye

Teotihuacan — Mexico

Satellite Map - Teotihuacan, Mexico

Rising 20 stories above the central Mexican highlands, the pyramids of Teotihuacan (pronounced tay-oh-tee-wah-con) were central to Toltec learning and culture. The city, about the size of ancient Athens and Rome, was abandoned about 1500 years ago. Using an advanced understanding of mathematics, geometry and astronomy, the Toltecs built the largest pyramid, “The Pyramid of the Sun,” with an alignment to coincide with the two days (May 19th and July 25th) when the sun would be directly over the top of the pyramid at noon. This would also create an alignment to the east toward the rising sun and to the west for the setting sun. This pyramid has a base only 10 feet shorter on each side than the Great Pyramid of Cheops in Egypt. GeoEye’s IKONOS satellite took this image of Teotihuacan on October 12, 2001. Photo credit: GeoEye

Uxmal — Mexico

Satellite Image - Uxmal, Mexico

Founded in about 500 AD, Uxmal (pronounced “oosh-mahl”) was the most powerful site in western Yucatan. Many of the buildings rely simply on well-cut stones with no mortar. Astronomical alignments at Uxmal surround the planet Venus. The orientation of the long Palace of the Governor acts as a sighting with other buildings at Uxmal pointing to the southernmost rise location of Venus, which occurs once every eight years. GeoEye’s IKONOS satellite took this image of Uxmal on August 8, 2002. Photo credit: GeoEye

Satellite Image of the Month: Surabaya, Indonesia

Monday, December 11th, 2006

Satellite image of Surabaya (formerly Soerabaja) is Indonesia’s second-largest city, and the capital of the province of East Java. It is located on the northern shore of eastern Java at the mouth of the Mas River and the side of Madura Strait. Surabaya derives its name from the words sura (shark) and buaya (crocodile), which have been told in local myth fighting each other in order to gain the title “the strongest and most powerful animal in the area.”

QuickBird Image of Surabaya, Indonesia

Click thumbnail to enlarge (broadband recommended).

The city was re-occupied by the Dutch in 1947. Because of prolonged international pressure, the Dutch agreed to transfer the sovereignty of its colony in August 1949. Surabaya was ultimately incorporated into Indonesia in December 1949 and rebuilt. The city is now one of the busiest ports in the country. Its principal exports include sugar, tobacco and coffee. It has a large shipyard, and numerous specialized naval schools.

As the main seaport and commercial center in the eastern region of Indonesia, Surabaya has become one of the largest cities in Southeast Asia. Today, Surabaya’s population is around three million, and the surrounding metropolitan area houses at least 5 million. The areas surrounding Surabaya include Lamongan to the northwest, Gresik to the west, Bangkalan to the northeast, Sidoarjo to the south, and Mojokerto and Jombang to the southwest.

Using Google Earth to Create an ‘Area of Interest’ for Custom Satellite Images

Tuesday, December 5th, 2006

We’re excited about a new section of content we’ve built at the main SIC site. A new page, entitled “Google Earth: Identifying High-Resolution Satellite Target Locations,” is now stored in our Satellite Image Resources section.

Google Earth has done much to popularize satellite imaging at an informal level. While the imagery offered by programs such as Google Earth falls short of custom, high-resolution satellite imagery, we’re happy that this sort of technology is becoming widespread, and we’re eager to show its audience how such technology can represent the very first step in procuring exquisitely detailed, high-resolution images for engineering and other commercial projects.

With that in mind, we built a special page that explains how to use Google Earth to find your “Area of Interest” when beginning to research your satellite image needs. The following image shows a screen shot of Google Earth (this particular shot shows the Apple Computer campus in Cupertino, CA, as viewed through the program).

A larger version of this image of the Apple Computer campus is used on SIC's Google Earth page to describe how Google Earth displays image coordinates

Following are just some of the things discussed in the larger article: A brief history of Google Earth. Explains different pricing options and features.

Image quality of Google Earth vs. custom imagery. Compares QuickBird and Google Earth versions of imagery of Hurghada, Egypt.

Google Earth features. Using Google Earth’s “Fly to” feature and learning how to find and document the “opposite corner” coordinates of your target location.

Using Google Earth to preview your custom satellite photo. Get a look at what your custom image will look like.