Index of /arm-iop-file/2022/sgp/aef/tagestad-camspec-air

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Multispectral and thermal surface imagery and surface elevation mosaics - AAF Engineering Flights

Overview:

This data set contains high-resolution image products (orthomosaics) acquired from midsized uncrewed aerial systems that have been processed for value-added quality. The instrument Altum multispectral imager by Micasense, captures in six bands (blue - 475nm, green - 560nm, red - 668nm, red edge - 717nm, near-infrared - 840 and LWIR/thermal - 11000nm. The optical bands are converted to reflectance via custom code using the instantaneous band horizontal irradiance ratio to the radiance of the pixel. The code used to develop these images first uses tools from the Micasense Python library to apply dark level corrections, row gradient corrections, and radiometric corrections. Next, it uses the processing API from Agisoft Metashape software to align and mosaic the processed imagery, following the processes developed by the USGS' structure from motion workflow documentation. Captures from different altitudes are used to produce an orthomosaic at each height. A tif image containing information related to the six spectral bands, and a digital elevation model (DEM), a tif image containing information related to the elevation of the surveyed terrain. 

1 https://www.arm.gov/publications/tech_reports/handbooks/doe-sc-arm-tr-281.pdf 

2 https://micasense.github.io/imageprocessing/MicaSense%20Image%20Processing%20Setup.html 

3 https://pubs.usgs.gov/of/2021/1039/ofr20211039.pdf

Flights were conducted at the SGP site in July 2022 and at the Pendleton UAS Range in February 2023.

Metadata Creator:
Name: Jerry Tagestad
Email: jerry.tagestad@pnnl.gov Phone: 5093716070
Street: City: Richland
State: Postal: 99352
Contact Info:
Name: Jerry Tagestad
Email: jerry.tagestad@pnnl.gov Phone: 5093716070
Street: City: Richland
State: Postal: 99352
Investigator(s): Ilan Gonzalex-Hirshfeld (ilan.gonzalez-hirshfeld@pnnl.gov)
Kristian Nelson (kristian.nelson@pnnl.gov)
Lexie Goldberger (lexie.goldberger@pnnl.gov)
Data Citation:https://doi.org/10.5439/1962600, https://doi.org/10.5439/1969041
Data Format:tagged image format (TIF)
File Naming Convention:{site}{instrument}.{YYYYMMDD}.{HHMMSS}.{altitude(msl)}.{file ext}
Directory Organization:Data are separated into pendleton and sgp directories. Zipped by date. One folder contains the digital elevation models produced from the imagery; the other has the corrected spectral data from all six bands in the form of an orthomosaiced tif image of reflectance.
Abstract:

This data set contains high-resolution image products (orthomosaics) acquired from midsized uncrewed aerial systems that have been processed for value-added quality. The instrument Altum multispectral imager by Micasense, captures in six bands (blue - 475nm, green - 560nm, red - 668nm, red edge - 717nm, near-infrared - 840 and LWIR/thermal - 11000nm. The optical bands are converted to reflectance via custom code using the instantaneous band horizontal irradiance ratio to the radiance of the pixel. The code used to develop these images first uses tools from the Micasense Python library to apply dark level corrections, row gradient corrections, and radiometric corrections. Next, it uses the processing API from Agisoft Metashape software to align and mosaic the processed imagery, following the processes developed by the USGS' structure from motion workflow documentation. Captures from different altitudes are used to produce an orthomosaic at each height. A tif image containing information related to the six spectral bands, and a digital elevation model (DEM), a tif image containing information related to the elevation of the surveyed terrain. 

1 https://www.arm.gov/publications/tech_reports/handbooks/doe-sc-arm-tr-281.pdf 

2 https://micasense.github.io/imageprocessing/MicaSense%20Image%20Processing%20Setup.html 

3 https://pubs.usgs.gov/of/2021/1039/ofr20211039.pdf

Flights were conducted at the SGP site in July 2022 and at the Pendleton UAS Range in February 2023.
Purpose:

Data were collected as part of a platform field test. The surface imagery data collected is of higher resolution than historically used in atmospheric models and will help improve surface heterogeneity representation in LES models. This data set can also be used to evaluate the deployment of this type of multispectral imager on higher-flying uncrewed aerial systems.
Data Usage:For the orthomosaic tif images, there are six bands represented per pixel that represent surface reflectance (skin temperature for the sixth band). For the DEM, each pixel represents an elevation. Each pixel represents a 1m2 area and has an associated lat and lon in the metadata. These images can be converted into gridded products that can be used for analysis. Raster calculations of these bands can provide information on albedo, leaf area index, skin temperature, and various vegetative indices (e.g., NDVI).
Arm Sites: sgp,osc
Content Time Range: Begin: 2022-07-09 End: 2023-02-07
Instrument(s):Multispectral Thermal Imager
Data Type:AAF Engineering Flights
Scientific Measurements(s):
Measurement nameVariables
Optical surface reflectance in visible and near-infrared bandsthermal emittance (skin temperature)
skin_temp
elevation
Stratum Keyword(s):
land surface
Data Quality:
Attribute Accuracy: Imagery was corrected via calibrated two tarps of known reflectance at multiple time points to create an empirical line fit correction. Imagery was also validated against the JPL image library. Each pixel represents 1 m2.
Positional Accuracy: The instrument itself was coupled with a GPS, which was validated with the aerial platform's GPS. The aligned imagery had a positional accuracy of 18m compared with USGS image map reference.
Consistency and Completeness Report: Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
Factor Affecting the Research: Imagery was collected from a UAV platform at various altitudes during morning periods of 07/09/22 and 07/18/22. Various clouds may have passed overhead. Changes to direct and diffuse lighting were accounted for via an onboard downwelling light sensor (DLS2).
Use Restrictions: No use constraints are associated with this data.
Distribution Info:
Organization Name: ARM Archive User Services
Email: armarchive[at]ornl.gov Phone: 1-888-ARM-DATA
Street: Oak Ridge National Laboratory City: Oak Ridge
State: Tennessee Postal: 37831-6290