@article{fdi:010072663,
  title = {{M}onitoring water levels and discharges using radar altimetry in an ungauged river basin : the case of the {O}gooue},
  author = {{B}ogning, {S}. and {F}rappart, {F}. and {B}larel, {F}. and {N}ino, {F}ernando and {M}ah{\'e}, {G}il and {B}ricquet, {J}ean-{P}ierre and {S}eyler, {F}r{\'e}d{\'e}rique and {O}nguene, {R}. and {E}tame, {J}. and {P}aiz, {M}. {C}. and {B}raun, {J}ean-{J}acques},
  editor = {},
  language = {{ENG}},
  abstract = {{R}adar altimetry is now commonly used for the monitoring of water levels in large river basins. {I}n this study, an altimetry-based network of virtual stations was defined in the quasi ungauged {O}gooue river basin, located in {G}abon, {C}entral {A}frica, using data from seven altimetry missions ({J}ason-2 and 3, {ERS}-2, {ENVISAT}, {C}ryosat-2, {SARAL}, {S}entinel-3{A}) from 1995 to 2017. {T}he performance of the five latter altimetry missions to retrieve water stages and discharges was assessed through comparisons against gauge station records. {A}ll missions exhibited a good agreement with gauge records, but the most recent missions showed an increase of data availability (only 6 virtual stations ({VS}) with {ERS}-2 compared to 16 {VS} for {ENVISAT} and {SARAL}) and accuracy ({RMSE} lower than 1.05, 0.48 and 0.33 and {R}-2 higher than 0.55, 0.83 and 0.91 for {ERS}-2, {ENVISAT} and {SARAL} respectively). {T}he concept of {VS} is extended to the case of drifting orbits using the data from {C}ryosat-2 in several close locations. {G}ood agreement was also found with the gauge station in {L}ambarene ({RMSE} = 0.25 m and {R}-2 = 0.96). {V}ery good results were obtained using only one year and a half of {S}entinel-3 data ({RMSE} < 0.41 m and {R}-2 > 0.89). {T}he combination of data from all the radar altimetry missions near {L}amabrene resulted in a long-term ({M}ay 1995 to {A}ugust 2017) and significantly improved water-level time series ({R}-2 = 0.96 and {RMSE} = 0.38 m). {T}he increase in data sampling in the river basin leads to a better water level peak to peak characterization and hence to a more accurate annual discharge over the common observation period with only a 1.4 m(3)s(-1) difference (i.e., 0.03%) between the altimetry-based and the in situ mean annual discharge.},
  keywords = {altimetry ; water level ; discharge ; {GABON} ; {OGOUE} {BASSIN}},
  booktitle = {},
  journal = {{R}emote {S}ensing},
  volume = {10},
  numero = {2},
  pages = {art. 350 [18 ]},
  ISSN = {2072-4292},
  year = {2018},
  DOI = {10.3390/rs10020350},
  URL = {https://www.documentation.ird.fr/hor/fdi:010072663},
}