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Open/Close section General
Meta data ID {3E506CBB-E6E4-4F69-96E5-7B5AB4B25A67}
Last modified 2019-05-14T14:28:23
Open/Close section Dataset creators
Open/Close section Contact person
First name Kirsikka
Last name Heinilä
Email kirsikka.heinila@syke.fi
Organisation Finnish Environment Institute
Open/Close section Dataset creators
First name Kirsikka
Last name Heinilä
Organisation Finnish Environment Institute
Open/Close section Description
Open/Close section Basic information
Dataset title Airborne spectrometer data from snow-covered terrain measured on March 2010
Theme Environment and Conservation
Description The dataset contains 10 meter resolution reflectance data from boreal snow-covered landscape. The purpose of the airborne measurements was to investigate the effect of forest canopy on optical remote sensing signals for snow-covered surfaces. The hyperspectral airborne data was acquired with an AisaDUAL imaging spectrometer on March 18 and on March 21, 2010 in Sodankylä, Finland. The image swath was 240 meters and flight lines were several kilometers long. The original spatial resolution of the data is 80 cm x 80 cm, but it was resampled to pixel size of 10 m. All measurements were carried out in non-cloudy conditions (0/8 to 2/8 cloud cover). On 18 March, the tree canopy was snow-free and snow on the ground was several days old, while on 21 March, the tree canopy was snow-covered and snow on ground was newly fallen. The data contains mosaics of the flight lines for the bands 555 nm, 645 nm, 858.5 nm and 1640 nm as well as for the Normalized Difference Snow Index (NDSI) and Normalized Difference Vegetation Index (NDVI) for both days 18 March 2010 and 21 March 2010.
Language (dataset) English
Keyword spectrometer, airborne, reflectance, snow, NDSI, NDVI
Open/Close section Data processing steps
Data processing steps sampling
Description The airborne hyperspectral data was acquired with an AisaDUAL imaging spectrometer manufactured by Spectral Imaging Ltd (SPECIM). The airborne spectral measurements were made from helicopter at an altitude of 800 m producing a spatial resolution of 0.8 m. The image swath was 240 m and flight lines were several kilometers long. All measurements were carried out in direct illumination (i.e. clear sky: 0/8 to 2/8 cloud cover). The Oxford Technical Solutions RT4000 GPS/INS was utilized to enable high accuracy measurements with low drift rates. The instrument foreoptics unit was set to look at nadir (0 degrees) direction and the field of view (FOV) was 17 degrees.
Additional information (URL) http://www.sciencedirect.com/science/article/pii/S0303243413000767
Open/Close section Data processing steps
Data processing steps processing
Description The AisaDUAL spectrometer data was radiometrically and geometrically corrected by using CaliGeo tool by SPECIM in the ENVI software by Bestcomp 97. Kft. The original spectral resolution for the VNIR bands was 5 nm and for SWIR bands 6 nm totaling to 359 spectral bands. The image swath was 240 meters and flight lines were several kilometres long. The original spatial resolution of the data is 80 cm x 80 cm. From this data the bands 555 nm, 645 nm, 858.5 nm and 1640 nm were extracted from the spectra by using the band specific FWHM criterion (Full width at half maximum) corresponding to MODIS bands. For these bands the data was filtered with mean filter using 12x12 window corresponding to pixel size of 10 metre. Reflectances were calculated by using simultaneously measured radiance from a white Spectralon panel at a particular wavelength to describe incoming radiation. Spectralon measurements were done with a well calibrated spectrometer installed on 30 m high mast. The utilized instrument of the mast was Field Spec Pro JR from Analytical Spectral Devices Inc (ASD).
Additional information (URL) http://www.sciencedirect.com/science/article/pii/S0303243413000767
Open/Close section Material time period
Start date 2010-03-18
End date 2010-03-21
Open/Close section Area
West Bounding Longitude 26.5162
East Bounding Longitude 26.92
South Bounding Latitude 67.3386
North Bounding Latitude 67.4288
Open/Close section Distribution
Open/Close section Contact person
First name Kirsikka
Last name Heinilä
Email kirsikka.heinila@syke.fi
Organisation Finnish Environment Institute
Open/Close section Resources
Resource content description Data is available on request.
Open/Close section Resources
Resource content description Data available on request.
Open/Close section Resources
Resource content description Data is available on request.
Open/Close section Reference publications
Reference Heinilä, K., Salminen, M., Pulliainen, J., Cohen, J., Metsämäki, S., & Pellikka, P. (2014). The effect of boreal forest canopy to reflectance of snow covered terrain based on airborne imaging spectrometer observations. International Journal of Applied Earth Observation and Geoinformation, 27, 31-41
Reference Pulliainen, J., Salminen, M., Heinila, K., Cohen, J., & Hannula, H.R. (2014). Semi-empirical modeling of the scene reflectance of snow-covered boreal forest: Validation with airborne spectrometer and LIDAR observations. Remote Sensing of Environment, 155, 303-311
Reference Cohen, J., Lemmetyinen, J., Pulliainen, J., Heinila, K., Montomoli, F., Seppanen, J., & Hallikainen, M.T. (2015). The Effect of Boreal Forest Canopy in Satellite Snow Mapping-A Multisensor Analysis. Ieee Transactions on Geoscience and Remote Sensing, 53, 6593-6607

The license for open SYKE's open datasets is Creative Commons Attribution 4.0 International.

The data described here can be freely used to all purposes, provided that the source of the data is mentioned.

The citation for the dataset as given above.

Further information on the license:
https://creativecommons.org/licenses/by/4.0/legalcode (English)
https://creativecommons.org/licenses/by/4.0/legalcode.fi (Finnish)

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