The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Articles | Volume XLII-3/W12-2020
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-3/W12-2020, 389–393, 2020
https://doi.org/10.5194/isprs-archives-XLII-3-W12-2020-389-2020
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-3/W12-2020, 389–393, 2020
https://doi.org/10.5194/isprs-archives-XLII-3-W12-2020-389-2020

  06 Nov 2020

06 Nov 2020

ACCUMULATED REFLECTANCE TECHNIQUE FOR SAMPLING DELIMITATION IN THE RIACHO FUNDO CREEK, LAGO PARANOÁ-DF, FROM PLANETSCOPE IMAGES

C. S. Marinho, V. Sacramento, M. R. Cangiano, R. E. Cicerelli, and T. Almeida C. S. Marinho et al.
  • Universidade de Brasília, Instituto de Geociências, Campus Universitário Darcy Ribeiro, Asa Norte, CEP 70910-900 Brasília, DF, Brazil

Keywords: Accumulated Reflectance, Sampling Delimitation, Unsupervised Classification, PlanetScope Products, Inland Waters, Complex Waters, Optically Active Components (OAC)

Abstract. The delimitation of sampling points is an important step to avoid unnecessary costs in water collection process and laboratory analysis. Based on the accumulated reflectance of PlanetScope imagens, it was possible to verify areas of greater spectral variability related to the presence of Optically Active Components (OAC). In order to do that, the accumulated reflectance method was used, based on multitemporal images. For that, three PlanetScope Ortho Scene Products were tested: Atmospheric Corrected for Surface Reflectance (SR), Digital Number (DN), and Top of Atmosphere Reflectance (TOA) images. SR and DN products had similar outcome, while DN product was not ideal for the purpose of this article. Even though SR and DN products were able to delimitate sampling points, they may have radiometric issues, mainly because of their near infrared values.