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Random forest regression and spectral band selection for estimating sugarcane leaf nitrogen concentration using EO-1 Hyperion hyperspectral data

Random forest regression and spectral band selection for estimating sugarcane leaf nitrogen concentration using EO-1 Hyperion hyperspectral data | Remote Sensing News | Scoop.it

Nitrogen (N) is one of the most important limiting nutrients for sugarcane production. Conventionally, sugarcane N concentration is examined using direct methods such as collecting leaf samples from the field followed by analytical assays in the laboratory. These methods do not offer real-time, quick, and non-destructive strategies for estimating sugarcane N concentration. Methods that take advantage of remote sensing, particularly hyperspectral data, can present reliable techniques for predicting sugarcane leaf N concentration. Hyperspectral data are extremely large and of high dimensionality. Many hyperspectral features are redundant due to the strong correlation between wavebands that are adjacent. Hence, the analysis of hyperspectral data is complex and needs to be simplified by selecting the most relevant spectral features. The aim of this study was to explore the potential of a random forest (RF) regression algorithm for selecting spectral features in hyperspectral data necessary for predicting sugarcane leaf N concentration. To achieve this, two Hyperion images were captured from fields of 6–7 month-old sugarcane, variety N19. The machine-learning RF algorithm was used as a feature-selection and regression method to analyse the spectral data. Stepwise multiple linear (SML) regression was also examined to predict the concentration of sugarcane leaf N after the reduction of the redundancy in hyperspectral data. The results showed that sugarcane leaf N concentration can be predicted using both non-linear RF regression (coefficient of determination, R 2 = 0.67; root mean square error of validation (RMSEV) = 0.15%; 8.44% of the mean) and SML regression models (R 2 = 0.71; RMSEV = 0.19%; 10.39% of the mean) derived from the first-order derivative of reflectance. It was concluded that the RF regression algorithm has potential for predicting sugarcane leaf N concentration using hyperspectral data.

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Rugie's comment, September 25, 2012 11:26 AM
i'd like to see eddy covariance involved to measure CO2.. regards
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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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