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Using LiDAR, filmmaker discovers “lost city” | Ars Technica

Using LiDAR, filmmaker discovers “lost city” | Ars Technica | Remote Sensing News | Scoop.it
Cinematographer Steve Elkins announced last week that by using LiDAR (light detection and ranging), he discovered "what appears to be evidence of archaeological ruins in an area long rumored to contain the legendary lost city of Ciudad Blanca." The phrasing "lost city" is problematic, however: it's hard to lose a city when the city itself is a myth.

The mapping project, conducted over 40 hours split between seven flights during April and May, was led by Elkins' group, UTL Scientific. Participants include the thriller writer Douglas Preston, who is the former editor at the American Museum of Natural History. The project took place in conjunction with the government of Honduras with the help of technicians from the National Science Foundation's National Center for Airborne Laser Mapping and professors from the University of Houston.

 

The tech

The LiDAR survey covered the history-rich northeastern Mosquitia region of Honduras. They overflew the area, sending "25 to 50 laser pulses per square meter—a total of more than four billion laser shots" to the ground, according to the University of Houston, and capturing differences in elevation of as little as four inches. This process can look underneath forest canopies, producing a 3D map of areas in hours or days that an overland, machete-hacking expedition might take years to do.

The UTL survey employed an Optech Gemini Airborne Laser Scanner aboard a Cessna 337 Skymaster plane overflying 923 square kilometers at a height of 600 to 1,000 meters above the ground. According to UTL, 4 billion LiDAR "shots" were fired at a pulse rate of 125KHz.

Modern, high-intensity LiDAR is a recent innovation. The first archaeologists to use it to startling effect were Arlen and Diane Chase at Caracol in Belize, mapping more ground in four days, they said, than they had in their previous 25 years of exploration of the area.

Chris Fisher, as we detailed in a previous article, used it to extend the breadth and establish the importance of the Purepechan city of Sacapu Angamuco in western Mexico.

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Forest Cover Database Updates Using Multi-Seasonal RapidEye Data—Storm Event Assessment in the Bavarian Forest National Park

Forest Cover Database Updates Using Multi-Seasonal  RapidEye Data—Storm Event Assessment in the Bavarian Forest National Park | Remote Sensing News | Scoop.it
This study is a part of a research program that investigates the potential of RapidEye (RE) satellite data for timely updates of forest cover databases to reflect both regular management activities and sudden changes due to bark beetle and storms. Applied here in the Bavarian Forest National Park (BFNP) in southeastern Germany, this approach detected even small changes between two data takes, thus, facilitating documentation of regular management activities. In the case of a sudden event, forest cover databases also serve as a baseline for damage assessment. A storm event, which occurred on 13 July, 2011, provided the opportunity to assess the effectiveness of multi-seasonal RE data for rapid damage assessment. Images of sufficient quality (<20% cloud cover) acquired one day before the storm event were used as a baseline. Persistent cloud cover meant that the first “after event” image of sufficient quality was acquired six weeks later, on 22 August, 2011. Aerial images (AI) for the official damage assessment done by the BFNP administration were acquired on that same day. The RE analysis for damage assessment was completed two weeks after the post-event data take with an overall accuracy of 96% and a kappa coefficient of 0.86. In contrast, the official aerial image survey from the BFNP was first released in late November, eleven weeks later. Comparison of the results from the two analyses showed a difference in the detected amount of forest cover loss of only 3%. The estimated cost of the RE approach was four times less than that of the standard digital AI procedure employed by the BFNP.
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How Does LiDAR Remote Sensing Work? Light Detection and Ranging

This NEON Science video overviews what lidar or light detection and ranging is, how it works and what types of information it can provide. The video was prod...
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Landsat Seen as Stunning Return on Public Investment | Science Features

Landsat Seen as Stunning Return on Public Investment | Science Features | Remote Sensing News | Scoop.it
Landsat pays off in societal and commercial benefits. Read more
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GIS & Remote Sensing

GIS & Remote Sensing | Remote Sensing News | Scoop.it
“GIS & Remote Sensing, by Zy Sisal: updated automatically with a curated selection of articles, blog posts, videos and photos.”
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Know your Landsat: Understanding and Accessing Landsat Data

Interested in Landsat Data Discovery and Access? Landsat satellites have been observing Earth's land surfaces consistently for over 40 years, providing the l...
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Spectral Slope as an Indicator of Pasture Quality

Spectral Slope as an Indicator of Pasture Quality | Remote Sensing News | Scoop.it
In this study, we develop a spectral method for assessment of pasture quality based only on the spectral information obtained with a small number of wavelengths.
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Surface Freshwater Storage Variations in the Orinoco Floodplains Using Multi-Satellite Observations

Surface Freshwater Storage Variations in the Orinoco Floodplains Using Multi-Satellite Observations | Remote Sensing News | Scoop.it
Variations in surface water extent and storage are poorly characterized from regional to global scales.
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Downloading Landsat GeoTiff Images and Viewing Them in Quantum GIS - YouTube

This video tutorial demonstrates how to download Landsat GeoTiff images from the USGS's Glovis website and composite them in Quantum GIS (QGIS). This tutoria...
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Downloading LandSat Imagery from USGS Glovis and Importing it into ERDAS Imagine -- Part 2 - YouTube

Downloading LandSat Imagery from USGS Glovis and Importing it into ERDAS Imagine -- Part 2
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10 Open Source Remote Sensing Software Packages...

10 Open Source Remote Sensing Software Packages... | Remote Sensing News | Scoop.it
There is an abundance of choice for open source remote sensing software. This list of 10 free applications describes what each one brings to the table.
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Russia Declassifies Satellite Earth-Sensing Data

Russia Declassifies Satellite Earth-Sensing Data | Remote Sensing News | Scoop.it
Moscow, Russia (Sputnik) Dec 26, 2014 -
The Russian government said Friday it will provide public access to previously classified Earth-sensing data received from domestic and foreign satellites.
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Remote Sensing Basics - YouTube

Are you looking to get up to speed with the basics of remote sensing? This webinar by Russ Congalton of UNH and NHView will provide an introduction to remote...

Via Rich Schultz, Fernando Gil
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Rich Schultz's curator insight, January 9, 2:45 PM

Remote Sensing in 45 minutes!

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Short Announcement: “Quality Check” on SRTM1

Short Announcement: “Quality Check” on SRTM1 | Remote Sensing News | Scoop.it
“Well, I was expecting this. Damn, those new SRTM1 raster files provided via EarthExplorer by the USGS are sweet.”
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Using Remote Sensing to Measure Land Deformatio...

Using Remote Sensing to Measure Land Deformatio... | Remote Sensing News | Scoop.it
Using a remote sensing technique called ‘persistent scatterer interferometry’, Wide Area Processor (WAP) is able to measure changes in height over time
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Image Registration for Remote Sensing - gekoo.co - Search, Find, Compare and Buy it Now

Image Registration for Remote Sensing - gekoo.co - Search, Find, Compare and Buy it Now | Remote Sensing News | Scoop.it
Image Registration for Remote Sensing in gekoo.co - Search, Find, Compare and Buy it Now - Deals and Offers Online - Discounts and Promotions
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Modeling in layers: Using remote sensing, GIS expertise to improve disaster responses | SSEC News

Modeling in layers: Using remote sensing, GIS expertise to improve disaster responses | SSEC News | Remote Sensing News | Scoop.it
Remote sensing, GIS expertise intersect at CIMSS
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RS 2015 - International Workshop on Remote Sensing Data Analysis, Modeling, Interpretation and Applications: from a global view to a local analysis (RS 2015)

RS 2015 - International Workshop on Remote Sensing Data Analysis, Modeling, Interpretation and Applications: from a global view to a local analysis (RS 2015) | Remote Sensing News | Scoop.it
RS 2015 - International Workshop on Remote Sensing Data Analysis, Modeling, Interpretation and Applications: from a global view to a local analysis (RS 2015)
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Coloring the Sea Around the Pribilof Islands

Coloring the Sea Around the Pribilof Islands | Remote Sensing News | Scoop.it
.@NASA_Landsat 8 captured this look at the coloring of the sea around the Pribilof Islands: http://t.co/UUxIdCNaZV http://t.co/1z0BisMB6f
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Mapping Permafrost in the Alaskan Yukon River Basin | LP DAAC :: NASA Land Data Products and Services

Mapping Permafrost in the Alaskan Yukon River Basin | LP DAAC :: NASA Land Data Products and Services | Remote Sensing News | Scoop.it
Web-Enabled #Landsat data used to map permafrost in Alaska Yukon River Basin. http://t.co/z75hT2l8rP , @NASA_Landsat http://t.co/3cAvZcYPkb
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How Satellite Technology Is Predicting Crop Yields: Q&A with Thomson Reuters | OpenMarkets

How Satellite Technology Is Predicting Crop Yields: Q&A with Thomson Reuters | OpenMarkets | Remote Sensing News | Scoop.it
A good read on Remote Sensing & Yield Forecasting at @lanworth @thomsonreuters via @Open_Markets http://t.co/8tE13cOzaw
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Downloading LandSat Imagery from USGS GLOVIS and Importing it into ERDAS Imagine -- Part 1 - YouTube

Downloading LandSat Imagery from USGS GLOVIS and Importing it into ERDAS Imagine -- Part 1
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Downloading Landsat GeoTiff Images and Viewing them in ArcMap 10 - YouTube

This brief video, produced by Village Earth with support from the Indian Land Tenure Foundation, was developed to help Native land owners and Tribal programs...
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Spatial Analysis and Introduction to Remote Sensing by Nancy Thomas - YouTube

Spatial Analysis and Introduction to Remote Sensing by Nancy Thomas
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Social Media and Remote Sensing

Social Media and Remote Sensing | Remote Sensing News | Scoop.it
King Fire, Forest Fire, California. (Source, NASA, 2014) At the start of the course I immersed myself in all things revolving Remote Sensing, and found that there were some interesting Instagram ac...
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SRTM-1 (1 Arc second) now available with large global coverage

SRTM-1 (1 Arc second) now available with large global coverage | Remote Sensing News | Scoop.it
“With this post I would like to come back on a topic from September 2014. In this blog post on Digital-Geography I announced that from September 2014 until September 2015 high-resultion SRTM-data will be provided for free by the USGS.”
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