The photographic project “Ground Truth: Corona Landmarks” is supported by the Land Arts Mobile Research Center/Andrew W. Mellon Foundation.

They are ground-truth markers for calibrating the first spy satellites, under a Cold War program known as Corona. Installed in the mid-1960s by the U.S. Army Corps of Engineers, the targets were left to ruin when the program was decommissioned in 1972. They were forgotten until 2004, when pilot Pez Owen traced the strange symbols she had seen from the air to the Corona program. 1

Satellite calibrationsites

With my colleague Damon Sauer, I have been exploring this array of ground-truth markers for the past several years. They are off Interstate 8, near the earthen building ruins of Casa Grande, interspersed among truck stops, quarries, alfalfa fields, and canals. Damon mapped the entire system, using images from Google Earth and historic aerial photographs, and we are visiting the surviving targets on foot. Our project inverts the original relation between the ground and outer space. While the Corona markers were meant to be seen from above, we have turned them into observatories for perceiving the invisible bodies in orbit today.

The central field of vision for most people covers an angle of between 50° and. 60°. Within this angle, both eyes observe an object simultaneously. This creates ...

Spysatellitefilm recovery

Jun 16, 2003 — Target. It's usually located where they sell printer refill cartridges. •••. More options.

In the Sonoran Desert south of Phoenix, Arizona, there is an array of giant concrete targets whose purpose was secret until about a decade ago. Each target is made of four triangular slabs that form an X about 60 feet wide. If you were to stumble across one of these strange monuments on a desert ramble, you would not see it as part of the larger array, as the targets are spaced a mile apart on a 16×16-mile grid. You might guess that it was meant to be seen from above, like the concrete arrows that guided navigation for U.S. airmail pilots, but in fact these mysterious Xs are conspicuously missing from flight maps.

Limit of resolution definition: the capacity of an optical system to resolve point objects as separate images.. See examples of LIMIT OF RESOLUTION used in ...

For decades tourists have marveled at monumental dams of the American West. These days they trace infrastructures like satellite communications and nuclear waste transport.

The declassified 16mm film A Point in Time tells the story of how the CIA and Air Force raced to build a space-based surveillance system after the launch of Sputnik. It must have seemed preposterous at the time: panoramic cameras filled with pounds of physical film were shot into space to take pictures of the Soviet Union and China, and then the records were sent back to Earth for analysis in heat-shielded capsules that fell through the atmosphere, shedding layers and unfurling parachutes caught by planes. After years of failed attempts, the plan actually worked.

You are reading an article printed from Places, the journal of public scholarship on architecture, landscape, and urbanism. Read more at placesjournal.org.

If an image is made through a small aperture, there is a point at which the resolution of the image is limited by the aperture diffraction. As a matter of ...

US spysatellite

We plot the location of all publicly known satellites that were overhead at the moment the photograph was taken. Our images are thus documentary records, aesthetic statements, and data maps, all at once. If you look closely, you can read the names of the satellites. Some are evocative, like “Globalstar” and “Cosmos,” while others indicate the purpose or country of origin. We were astonished by the number of satellites present in the sky at any given time (an emerging sustainability issue, as myriad metallic flecks encircle the globe).

Unpolarized light, after being reflected by a specular (shiny) surface, generally obtains a degree of polarization. · Wearers of polarized sunglasses will ...

In the Sonoran Desert south of Phoenix, Arizona, there is an array of giant concrete targets whose purpose was secret until about a decade ago. Each target is made of four triangular slabs that form an X about 60 feet wide. If you were to stumble across one of these strange monuments on a desert ramble, you would not see it as part of the larger array, as the targets are spaced a mile apart on a 16×16-mile grid. You might guess that it was meant to be seen from above, like the concrete arrows that guided navigation for U.S. airmail pilots, but in fact these mysterious Xs are conspicuously missing from flight maps. They are ground-truth markers for calibrating the first spy satellites, under a Cold War program known as Corona. Installed in the mid-1960s by the U.S. Army Corps of Engineers, the targets were left to ruin when the program was decommissioned in 1972. They were forgotten until 2004, when pilot Pez Owen traced the strange symbols she had seen from the air to the Corona program. 1 The declassified 16mm film A Point in Time tells the story of how the CIA and Air Force raced to build a space-based surveillance system after the launch of Sputnik. It must have seemed preposterous at the time: panoramic cameras filled with pounds of physical film were shot into space to take pictures of the Soviet Union and China, and then the records were sent back to Earth for analysis in heat-shielded capsules that fell through the atmosphere, shedding layers and unfurling parachutes caught by planes. After years of failed attempts, the plan actually worked. Map of spy satellite calibration targets in the Sonoran Desert. [Interactive map by Damon Sauer]With my colleague Damon Sauer, I have been exploring this array of ground-truth markers for the past several years. They are off Interstate 8, near the earthen building ruins of Casa Grande, interspersed among truck stops, quarries, alfalfa fields, and canals. Damon mapped the entire system, using images from Google Earth and historic aerial photographs, and we are visiting the surviving targets on foot. Our project inverts the original relation between the ground and outer space. While the Corona markers were meant to be seen from above, we have turned them into observatories for perceiving the invisible bodies in orbit today. We plot the location of all publicly known satellites that were overhead at the moment the photograph was taken. Our images are thus documentary records, aesthetic statements, and data maps, all at once. If you look closely, you can read the names of the satellites. Some are evocative, like “Globalstar” and “Cosmos,” while others indicate the purpose or country of origin. We were astonished by the number of satellites present in the sky at any given time (an emerging sustainability issue, as myriad metallic flecks encircle the globe). “Ground truth” is a term used in remote sensing to describe the correspondence between image data and physical features in the world. We were drawn to the term because it honors embodied or situated knowledge as a special kind of awareness, while also evoking photography’s tenuous relation to truth. Our project examines the relation between human beings and the pervasive information networks in which we are enmeshed. Our satellite tracings resemble star charts as old as civilization — a reminder that humans have always sought to orient themselves to the heavenly unknown. Ground Truth: Corona LandmarksSlideshowSlideshowCalibration Mark AG49 with Satellites.SlideshowCalibration Mark AE48 with Satellites.SlideshowCalibration Mark AC47 with Satellites.SlideshowCalibration Mark AJ46 with Satellites.SlideshowCalibration Mark AD48 with Satellites.SlideshowCalibration Mark AD49 with Satellites.SlideshowCalibration Mark AD51 with Satellites.SlideshowCalibration Mark X47 with Satellites.SlideshowCalibration Mark AF49 with Satellites.SlideshowCalibration Mark AH49 with Satellites.SlideshowCalibration Mark AJ48 with Satellites.SlideshowCalibration Mark AM48 with Satellites.SlideshowCalibration Mark AM43 with Satellites.SlideshowCalibration Mark Y44 with Satellites.SlideshowCalibration Mark AF48 with Satellites.SlideshowCalibration Mark AJ55 with Satellites.SlideshowCalibration Mark AK46 with Satellites.SlideshowCalibration Mark AE49 with Satellites.SlideshowCalibration Mark AN52 with Satellites.

“Ground truth” is a term used in remote sensing to describe the correspondence between image data and physical features in the world. We were drawn to the term because it honors embodied or situated knowledge as a special kind of awareness, while also evoking photography’s tenuous relation to truth. Our project examines the relation between human beings and the pervasive information networks in which we are enmeshed. Our satellite tracings resemble star charts as old as civilization — a reminder that humans have always sought to orient themselves to the heavenly unknown.

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Contextual translation of "decement" into English. Human translations with examples: MyMemory, World's Largest Translation Memory.

Jun 11, 2023 — Regardless of the brand, it's your skill as a photographer and your ability to connect with the subject that truly brings a photograph to life.

Coronasatellite calibration targets

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A photographer’s journey along the Camino del Diablo in the Sonoran Desert, much of which is now a bombing range, reveals a landscape of forbidding danger and compelling beauty.

Satellite calibration targetsarizona

A writer and photographer document the ruined military base where the U.S. Air Force trained for the bombing of Hiroshima.

Map of spy satellite calibration targets in the Sonoran Desert. [Interactive map by Damon Sauer]With my colleague Damon Sauer, I have been exploring this array of ground-truth markers for the past several years. They are off Interstate 8, near the earthen building ruins of Casa Grande, interspersed among truck stops, quarries, alfalfa fields, and canals. Damon mapped the entire system, using images from Google Earth and historic aerial photographs, and we are visiting the surviving targets on foot. Our project inverts the original relation between the ground and outer space. While the Corona markers were meant to be seen from above, we have turned them into observatories for perceiving the invisible bodies in orbit today. We plot the location of all publicly known satellites that were overhead at the moment the photograph was taken. Our images are thus documentary records, aesthetic statements, and data maps, all at once. If you look closely, you can read the names of the satellites. Some are evocative, like “Globalstar” and “Cosmos,” while others indicate the purpose or country of origin. We were astonished by the number of satellites present in the sky at any given time (an emerging sustainability issue, as myriad metallic flecks encircle the globe). “Ground truth” is a term used in remote sensing to describe the correspondence between image data and physical features in the world. We were drawn to the term because it honors embodied or situated knowledge as a special kind of awareness, while also evoking photography’s tenuous relation to truth. Our project examines the relation between human beings and the pervasive information networks in which we are enmeshed. Our satellite tracings resemble star charts as old as civilization — a reminder that humans have always sought to orient themselves to the heavenly unknown. Ground Truth: Corona LandmarksSlideshowSlideshowCalibration Mark AG49 with Satellites.SlideshowCalibration Mark AE48 with Satellites.SlideshowCalibration Mark AC47 with Satellites.SlideshowCalibration Mark AJ46 with Satellites.SlideshowCalibration Mark AD48 with Satellites.SlideshowCalibration Mark AD49 with Satellites.SlideshowCalibration Mark AD51 with Satellites.SlideshowCalibration Mark X47 with Satellites.SlideshowCalibration Mark AF49 with Satellites.SlideshowCalibration Mark AH49 with Satellites.SlideshowCalibration Mark AJ48 with Satellites.SlideshowCalibration Mark AM48 with Satellites.SlideshowCalibration Mark AM43 with Satellites.SlideshowCalibration Mark Y44 with Satellites.SlideshowCalibration Mark AF48 with Satellites.SlideshowCalibration Mark AJ55 with Satellites.SlideshowCalibration Mark AK46 with Satellites.SlideshowCalibration Mark AE49 with Satellites.SlideshowCalibration Mark AN52 with Satellites.

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Geneva pattern, strong tips, thick body. Style 00 SA ESD. Catalog, A mm, B mm ...

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