IMPACT OF REDUCTION OF RADIOMETRIC RESOLUTION IN HYPERSPECTRAL IMAGES ACQUIRED OVER FOREST FIELD
The objective of this study was to evaluate the impact of reducing the radiometric information of hyperspectral images. The image data was collected originally with 32 bits and rescaled to 8 and 16 bit/pixel. The images were acquired with a Rikola Hyperspectral Camera attached...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2018-09-01
|
| Series: | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| Online Access: | https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLII-1/301/2018/isprs-archives-XLII-1-301-2018.pdf |
| _version_ | 1818955840318603264 |
|---|---|
| author | G. T. Miyoshi N. N. Imai N. N. Imai A. M. G. Tommaselli A. M. G. Tommaselli E. Honkavaara |
| author_facet | G. T. Miyoshi N. N. Imai N. N. Imai A. M. G. Tommaselli A. M. G. Tommaselli E. Honkavaara |
| author_sort | G. T. Miyoshi |
| collection | DOAJ |
| description | The objective of this study was to evaluate the impact of reducing the radiometric information of hyperspectral images. The image data was collected originally with 32 bits and rescaled to 8 and 16 bit/pixel. The images were acquired with a Rikola Hyperspectral Camera attached to an Unmanned Aerial Vehicle (UAV). After the geometric and radiometric processing of the images, a mosaic was obtained with pixels representing reflectance factor coded in 32 bits. Using the minimum and maximum values of each spectral band, a linear equation was thus applied to reduce the radiometric resolution of the original mosaic, from 32 bits to 8 bits and from 32 bits to 16 bits. Following, the Normalized Root Mean Square Error (NRMSE %) and the Mean Absolute Percentage Error (MAPE %) were used to evaluate the results, showing that for the 8 bits mosaic, the loss of information was higher. For this radiometric resolution rescaling, the MAPE % achieved values until 22.486 % and the highest NRMSE % value was 0.455 % while, for the 16 bits mosaics, the highest MAPE % and NRMSE % values were 0.069 % and 0.002 %, respectively. Finally, it can be inferred that the impact of radiometric transformation can be considered as negligible for the hyperspectral mosaic with 16 bits of radiometric resolution, which presented lower values of NRMSE % and MAE % and could not affect the mosaic analysis. |
| first_indexed | 2024-12-20T10:44:27Z |
| format | Article |
| id | doaj.art-e6110cca5cd747229941480349dd8168 |
| institution | Directory Open Access Journal |
| issn | 1682-1750 2194-9034 |
| language | English |
| last_indexed | 2024-12-20T10:44:27Z |
| publishDate | 2018-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| spelling | doaj.art-e6110cca5cd747229941480349dd81682022-12-21T19:43:27ZengCopernicus PublicationsThe International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences1682-17502194-90342018-09-01XLII-130130510.5194/isprs-archives-XLII-1-301-2018IMPACT OF REDUCTION OF RADIOMETRIC RESOLUTION IN HYPERSPECTRAL IMAGES ACQUIRED OVER FOREST FIELDG. T. Miyoshi0N. N. Imai1N. N. Imai2A. M. G. Tommaselli3A. M. G. Tommaselli4E. Honkavaara5Post Graduate Program in Cartographic Science, São Paulo State University (UNESP), Presidente Prudente-SP, BrazilPost Graduate Program in Cartographic Science, São Paulo State University (UNESP), Presidente Prudente-SP, BrazilDept. of Cartography, São Paulo State University (UNESP), Presidente Prudente-SP, BrazilPost Graduate Program in Cartographic Science, São Paulo State University (UNESP), Presidente Prudente-SP, BrazilDept. of Cartography, São Paulo State University (UNESP), Presidente Prudente-SP, BrazilFinnish Geospatial Research Institute FGI, Geodeetinrinne 2, P.O. Box 15, FI-02431 Masala, FinlandThe objective of this study was to evaluate the impact of reducing the radiometric information of hyperspectral images. The image data was collected originally with 32 bits and rescaled to 8 and 16 bit/pixel. The images were acquired with a Rikola Hyperspectral Camera attached to an Unmanned Aerial Vehicle (UAV). After the geometric and radiometric processing of the images, a mosaic was obtained with pixels representing reflectance factor coded in 32 bits. Using the minimum and maximum values of each spectral band, a linear equation was thus applied to reduce the radiometric resolution of the original mosaic, from 32 bits to 8 bits and from 32 bits to 16 bits. Following, the Normalized Root Mean Square Error (NRMSE %) and the Mean Absolute Percentage Error (MAPE %) were used to evaluate the results, showing that for the 8 bits mosaic, the loss of information was higher. For this radiometric resolution rescaling, the MAPE % achieved values until 22.486 % and the highest NRMSE % value was 0.455 % while, for the 16 bits mosaics, the highest MAPE % and NRMSE % values were 0.069 % and 0.002 %, respectively. Finally, it can be inferred that the impact of radiometric transformation can be considered as negligible for the hyperspectral mosaic with 16 bits of radiometric resolution, which presented lower values of NRMSE % and MAE % and could not affect the mosaic analysis.https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLII-1/301/2018/isprs-archives-XLII-1-301-2018.pdf |
| spellingShingle | G. T. Miyoshi N. N. Imai N. N. Imai A. M. G. Tommaselli A. M. G. Tommaselli E. Honkavaara IMPACT OF REDUCTION OF RADIOMETRIC RESOLUTION IN HYPERSPECTRAL IMAGES ACQUIRED OVER FOREST FIELD The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| title | IMPACT OF REDUCTION OF RADIOMETRIC RESOLUTION IN HYPERSPECTRAL IMAGES ACQUIRED OVER FOREST FIELD |
| title_full | IMPACT OF REDUCTION OF RADIOMETRIC RESOLUTION IN HYPERSPECTRAL IMAGES ACQUIRED OVER FOREST FIELD |
| title_fullStr | IMPACT OF REDUCTION OF RADIOMETRIC RESOLUTION IN HYPERSPECTRAL IMAGES ACQUIRED OVER FOREST FIELD |
| title_full_unstemmed | IMPACT OF REDUCTION OF RADIOMETRIC RESOLUTION IN HYPERSPECTRAL IMAGES ACQUIRED OVER FOREST FIELD |
| title_short | IMPACT OF REDUCTION OF RADIOMETRIC RESOLUTION IN HYPERSPECTRAL IMAGES ACQUIRED OVER FOREST FIELD |
| title_sort | impact of reduction of radiometric resolution in hyperspectral images acquired over forest field |
| url | https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLII-1/301/2018/isprs-archives-XLII-1-301-2018.pdf |
| work_keys_str_mv | AT gtmiyoshi impactofreductionofradiometricresolutioninhyperspectralimagesacquiredoverforestfield AT nnimai impactofreductionofradiometricresolutioninhyperspectralimagesacquiredoverforestfield AT nnimai impactofreductionofradiometricresolutioninhyperspectralimagesacquiredoverforestfield AT amgtommaselli impactofreductionofradiometricresolutioninhyperspectralimagesacquiredoverforestfield AT amgtommaselli impactofreductionofradiometricresolutioninhyperspectralimagesacquiredoverforestfield AT ehonkavaara impactofreductionofradiometricresolutioninhyperspectralimagesacquiredoverforestfield |