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Researchers develop new technique to assess diversity of plant species from afar | Science Codex

Researchers develop new technique to assess diversity of plant species from afar | Science Codex | Remote Sensing News | Scoop.it
By analyzing vegetation information collected by satellites over time instead of for just one day, scientists in the Michigan State University Center for Systems Integration and Sustainability (CSIS) have developed a novel procedure to assess the composition of plant species in an area.

Researchers long have used multi-spectral images (which include radiation outside human perception, such as infrared) and other remotely sensed data to create maps of vegetation around the globe. But seasonal changes in vegetation can limit the usefulness of these procedures, making them accurate for only the particular day or season when the data was collected......

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Satellites map Earth's vital resources - Space Ref

Satellites map Earth's vital resources - Space Ref | Remote Sensing News | Scoop.it

Satellites map Earth's vital resourcesSpace Ref (press release)

Polarimetric InSAR - or Pol-InSAR - is a remote sensing technique based on polarimetric information in Synthetic Aperture Radar (SAR) images.


Via Knapco
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Remote Sensing | Free Full-Text | Forest Delineation Based on Airborne LIDAR Data

Remote Sensing | Free Full-Text | Forest Delineation Based on Airborne LIDAR Data | Remote Sensing News | Scoop.it
The delineation of forested areas is a critical task, because the resulting maps are a fundamental input for a broad field of applications and users.
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Clean Water Space » Selenga (Selenge) River Delta

Clean Water Space » Selenga (Selenge) River Delta | Remote Sensing News | Scoop.it

The Selenga River (often called Selenge River) is a major river in Asia that forms at the confluence of the Ider and Delger Rivers in northern Mongolia. It flows northeastwards through Mongolia and Russia and forms a large delta on the southeast shoreline of Lake Baikal, the world’s largest and deepest freshwater lake. Tributaries include: Eg River, Dzhida River, Orkhon River, Khanui River, Chikoy River, Khilok River, and Uda River. The Selenga is the primary contributor of water to Lake Baikal and its tributaries drain approximately 80 percent of the lake’s watershed.

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Remotely Sensing

A few days ago, I contacted Henry, a geospatial analyst at the World Bank, to fact check a section of an article I am writing on remote sensing. “There are many types of remote sensors,” I started, sounding more knowledgeable than I felt, elaborating on optical, remote, and other sensors. I ended and could hear his indecision in the momentary pause.

“It sounds right,” Henry said, “but to tell you the truth, I don’t know much about the sensors.” Henry was a geospatial analyst, not a satellite expert. “But do you need all that technical information? What if you said, “Earth Observation tools capture data from space?,” he suggested. But I wasn’t prepared to give up. I couldn’t assume that readers would have working knowledge about remote sensors. I didn’t know, and neither did Henry– and Henry it was his field of expertise! .....................

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Mount St. Helens from Space, 1979-2011

The 1980 eruption of Mt. St. Helens, which began with a series of small earthquakes in mid-March and peaked with a cataclysmic flank collapse, avalanche, and...
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Landsat - Looking at Earth's Surface - NASA

The Landsat program is the longest continuous global record of the Earth's surface, and continues to deliver both visually stunning and scientifically valuab...
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Remote Sensing | Free Full-Text | A Phase-Offset Estimation Method for InSAR DEM Generation Based on Phase-Offset Functions

Remote Sensing | Free Full-Text | A Phase-Offset Estimation Method for InSAR DEM Generation Based on Phase-Offset Functions | Remote Sensing News | Scoop.it
This paper presents a novel method for estimating the absolute phase offset in interferometric synthetic aperture radar (SAR) measurements for digital elevation model (DEM) generation.
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GeoEye-2 on Schedule : Earth Imaging Journal: Remote Sensing ...

GeoEye-2 on Schedule : Earth Imaging Journal: Remote Sensing ... | Remote Sensing News | Scoop.it
An artist's rendering shows the GeoEye-2 Earth observation satellite. GeoEye has hired Lockheed Martin Space Systems of Sunnyvale, Calif., to build GeoEye-2, and has reserved a United Launch Alliance Atlas 5 vehicle to launch the satellite ...
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Art on a Different Wavelength - Wall Street Journal (blog)

Art on a Different Wavelength - Wall Street Journal (blog) | Remote Sensing News | Scoop.it
Art on a Different WavelengthWall Street Journal (blog)The latest satellite, Landsat 7, uses an instrument that collects seven images at once, with each image showing a specific section of the electromagnetic spectrum, called a band.
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NASA - 25 Years of Landsat 5

Twenty-two years beyond its primary mission lifetime, Landsat 5 is still going strong. It has charted urban growth in Las Vegas, monitored fire scars in Yell...
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Classification and Change Detection Using Landsat TM Data: When and How to Correct Atmospheric Effects?

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ESA - Observing the Earth - Earth from Space: Algerian sands

ESA - Observing the Earth - Earth from Space: Algerian sands | Remote Sensing News | Scoop.it
This image from the Ikonos-2 satellite shows the sandy and rocky terrain of the Sahara desert in western Algeria.
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Urban Lab Global Cities (ULGC): Urban archaeology: A New remote-sensing system for study of ancient urban patterns by Jason Ur

Urban Lab Global Cities (ULGC): Urban archaeology: A New remote-sensing system for study of ancient urban patterns by Jason Ur | Remote Sensing News | Scoop.it

Landscape pasts usually provide information for landscape presents and futures, precisely, on the way we lived in the past, on ancient urban and landscape features.
Jason Ur, the John L. Loeb Associate Professor of the Social Sciences, Harvard, shared to The Harvard Gazette his recent project, namely a new remote-sensing system he developed, March 23rd, 2012. This system, he says, uses computers to scour satellite images for telltale clues of human habitation.
For this project, he collaborated with Bjoern Menze, a research affiliate in MIT's Computer Science an Artificial Intelligence Laboratory.

This new system, of course, is primarily created for archaeoligsts and landscape archaeologists. This nevertheless can be very useful for planners and architects, in particular those who have a strong interest in past urban patterns.

As the image below shows, this new software utilizes soil discolorations and the distinctive mounding resulting from the collapse of mud-brick homes, among others factors to identiy ancient settlements.

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NASA Updates Eyes on Earth Visualization Site | Spatial Sustain

NASA Updates Eyes on Earth Visualization Site | Spatial Sustain | Remote Sensing News | Scoop.it
Eyes on Earth is an interactive visualization site for images and data from NASA’s 15 currently operating earth satellites. There are a number of new features, with timelines, an image gallery, an improved interface, and up-to-date data for sea level height and surface temperature.

The aim is a daily view view of our dynamic planet that promises interactive virtual reality. Toward that goal, the popular image of the day is now viewable in 3D (anaglyph glasses required)........

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Paraná River Floodplain, Brazil : Image of the Day

Paraná River Floodplain, Brazil : Image of the Day | Remote Sensing News | Scoop.it

The Paraná River appears as a wide, blue strip with the muddy brown water of the smaller Verde River entering from the northwest (top left). An extensive wetland (dark green) occupies most of the left half of this astronaut photograph, and the floodplain reaches a width of 11 kilometers (about 7 miles). The thin line of a road crossing the floodplain also gives a sense of scale. Above the Paraná-Verde confluence (image center), the floodplain is much narrower.
The floodplain is generated by sediments delivered by both rivers. The evidence for this is that the entire surface is crisscrossed by the wider traces of former Paraná River channels, as well as numerous narrower traces of the Verde. The floodplains along both rivers are bordered by numerous rectangular agricultural fields. The dominant crops along this part of the Paraná River are coffee, corn, and cotton.......

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Google Promotes Terrapixels for Everyone | Spatial Sustain

Google Promotes Terrapixels for Everyone | Spatial Sustain | Remote Sensing News | Scoop.it
David Thau, senior developer advocate for Google Earth Engine, gave the keynote speech at this morning’s ASPRS Annual Meeting. The talk began with a discussion of Stewart Brand’s campaign to see a picture of the whole earth from space, which has been said to have kicked off earth day, the ecology movement, global politics, and a greater awareness of remote sensing. Google believes in the power of this greater earth awareness, with the aim of bringing geographic literacy to everyone.

Thau discussed the many advancements that have taken place along a full range of remote sensing technologies.......

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NASA MODIS Image of the Day: March 22, 2012 - The Bering Sea | SpaceRef - Your Space Reference

NASA MODIS Image of the Day: March 22, 2012 - The Bering Sea | SpaceRef - Your Space Reference | Remote Sensing News | Scoop.it
The sea ice and snow is so thick throughout this region that it is difficult to discern where land gives way to sea, especially in the low resolution image.

Although sea ice forms on the Bering Sea each year, this has been an unusually severe winter. The National Snow and Ice Data Center (NSIDC) data indicate that the ice extent in the Bering Sea for most of the winter of 2011-2012 has been 15-25 percent above the 1979 to 2000 average. The past several months have included the second highest ice extent in the satellite record for the region

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Landsat - A Space Age Water Gauge

Water specialists Rick Allen, Bill Kramber and Tony Morse use Landsat thermal band data to measure the amount of water evaporating from the soil and transpir...
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Bharatkalyan97: Mapping patterns of long-term settlement in Northern Mesopotamia at a large scale -- Bjoern H. Menzea and Jason A. Ura (PNAS, 2012)

The landscapes of the Near East show both the first settlements and the longest trajectories of settlement systems. Mounding is a characteristic property of these settlement sites, resulting from millennia of continuing settlement activity at distinguished places. So far, however, this defining feature of ancient settlements has not received much attention, or even been the subject of systematic evaluation. We propose a remote sensing approach for comprehensively
mapping the pattern of human settlement at large scale and establish the largest archaeological record for a landscape in Mesopotamia, mapping about 14,000 settlement sites—spanning eight millennia—at 15-m resolution in a 23,000-km2 area in northeastern Syria. To map both low- and high-mounded places—the latter of which are often referred to as “tells”—we develop a strategy for detecting anthrosols in time series of multispectral satellite images and measure the volume of settlement sites in a digital elevation model. Using this volume as a proxy to continued occupation, we find a dependency of the long-term attractiveness of a site on local water availability, but also a strong relation to the relevance within a basin-wide exchange network
that we can infer from our record and third millennium B.C. intersite routes visible on the ground until recent times. We believe it is possible to establish a nearly comprehensive map of human settlements in the fluvial plains of northern Mesopotamia and beyond, and site volume may be a key quantity to uncover long-term trends in human settlement activity from such a record.
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MAP: Landsat and Spot satellite images can help find the cause of ...

Jurnalnet.com York: Landsat and Spot satellite images having high spatial and spectral resolution can help find the causes flooding, erosion and landslides in the watershed ecosystem (DAS). "The two images are able to monitor changes in ...
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Satellites Expose 8000 Years of Lost Civilization - Scientific American

Satellites Expose 8000 Years of Lost CivilizationScientific American"This kind of innovative large-scale application is what remote sensing has been promising archaeology for some years now; it will certainly help us to focus our attention on the ...
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Tutorials & technical matters: H2O environmental AquaLED: Atmospheric correction of Landsat imagery

Tutorials & technical matters: H2O environmental AquaLED: Atmospheric correction of Landsat imagery | Remote Sensing News | Scoop.it

When an image is downloaded, besides the corresponding bands (which contain the data), you will notice that there are two txt files that accompany the data. Such files contain the Metadata necessary for the calibration of the image. The procedure you should follow is described in several papers, among which Chander et al. (2009) is highly recommended when using Landsat imagery. Next we describe the procedure we recommend to accomplish this task. The following is an example with a Landsat ETM scene, prepared by the ecologist and agricultural engineer C. Buitrón, under the assessment of the geographic engineer J. Fernández. Both are independent consultants in environmental projects.
Remember that in case you wish to carry this procedure to calibrate TM data, you should follow the procedure suggested in Chander et al. (2009), and generate the equations to convert DN to reflectance (perhaps using ERDAS´ Model Maker).

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IEEE Xplore - Updated Radiometric Calibration for the Landsat-5 Thematic Mapper Reflective Bands

The Landsat-5 Thematic Mapper (TM) has been the workhorse of the Landsat system. Launched in 1984, it continues collecting data through the time frame of this paper. Thus, it provides an invaluable link to the past history of the land features of the Earth's surface, and it becomes imperative to provide an accurate radiometric calibration of the reflective bands to the user community. Previous calibration has been based on information obtained from prelaunch, the onboard calibrator, vicarious calibration attempts, and cross-calibration with Landsat-7. Currently, additional data sources are available to improve this calibration. Specifically, improvements in vicarious calibration methods and development of the use of pseudoinvariant sites for trending provide two additional independent calibration sources. The use of these additional estimates has resulted in a consistent calibration approach that ties together all of the available calibration data sources. Results from this analysis indicate a simple exponential, or a constant model may be used for all bands throughout the lifetime of Landsat-5 TM. Where previously time constants for the exponential models were approximately one year, the updated model has significantly longer time constants in bands 1-3. In contrast, bands 4, 5, and 7 are shown to be best modeled by a constant. The models proposed in this paper indicate calibration knowledge of 5% or better early in life, decreasing to nearly 2% later in life. These models have been implemented at the U.S. Geological survey earth resources observation and science (EROS) and are the default calibration used for all Landsat TM data now distributed through EROS.

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Erdas : calculating the NDVI with landsat data... manually

this is a long introduction into ndvi calculation. it´s also covering radiance and reflectance conversion as a preprocessing for ndvi calculation.
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