@article{fdi:010074764,
  title = {{A}bsolute calibration or validation of the altimeters on the {S}entinel-3{A} and the {J}ason-3 over {L}ake {I}ssykkul ({K}yrgyzstan)},
  author = {{C}retaux, {J}. {F}. and {B}erge-{N}guyen, {M}. and {C}almant, {S}t{\'e}phane and {J}amangulova, {N}. and {S}atylkanov, {R}. and {L}yard, {F}. and {P}erosanz, {F}. and {V}erron, {J}. and {M}ontazem, {A}. {S}. and {L}e {G}uilcher, {G}. and {L}eroux, {D}. and {B}arrie, {J}. and {M}aisongrande, {P}. and {B}onnefond, {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{C}alibration/{V}alidation ({C}/{V}) studies using sites in the oceans have a long history and protocols are well established. {O}ver lakes, {C}/{V} allows addressing problems such as the performance of the various retracking algorithms and evaluating the accuracy of the geophysical corrections for continental waters. {T}his is achievable when measurements of specific and numerous field campaigns and a ground permanent network of level gauges and weather stations are processed. {C}/{V} consists of installation of permanent sites (weather stations, limnigraphs, and {GPS} reference points) and the organization of regular field campaigns. {T}he lake {I}ssykkul serves as permanent site of {C}/{V}, for a multi-mission purpose. {T}he objective of this paper is to calculate the altimeter biases of {J}ason-3 and {S}entinel-3{A}, both belonging to an operational satellite system which is used for the long-term monitoring of lake level variations. {W}e have also determined the accuracy of the altimeters of these two satellites, through a comparison analysis with in situ data. {I}n 2016 and 2017, three campaigns have been organized over this lake in order to estimate the absolute bias of the nadir altimeter onboard the {J}ason-3 and {S}entinel-3{A}. {T}he fieldwork consisted of measuring water height using a {GPS} system, carried on a boat, along the track of the altimeter satellite across the lake. {I}t was performed at the time of the pass of the altimeter. {A}bsolute altimeter biases were calculated by averaging the water height differences along the pass of the satellite ({GPS} from the boat system versus altimetry). {J}ason-3 operates in a {L}ow {R}esolution {M}ode ({LRM}), while the {S}entinel-3{A} operates in {S}ynthetic {A}perture {R}adar ({SAR}) mode. {I}n this study we found that the absolute biases measured for {J}ason-3 were -28 +/- 40 mm with the {O}cean retracker and 206 +/- 30 mm with the {I}ce-1 retracker. {T}he biases for {S}entinel-3{A} were -14 +/- 20 mm with the {S}amosa ({O}cean like) retracker and 285 +/- 20 mm with the {OCOG} ({I}ce-1-like) retracker. {W}e have also evaluated the accuracy of these two altimeters over {L}ake {I}ssykkul which reached to 3 cm, for both the instruments, using the {O}cean retracker.},
  keywords = {calibration ; validation ; lake ; {I}ssykkul ; {SAR} ; radar altimetry ; {J}ason-3 ; {S}entinel-3{A} ; {KIRGHIZISTAN} ; {ISSYKKUL} {LAC}},
  booktitle = {},
  journal = {{R}emote {S}ensing},
  volume = {10},
  numero = {11},
  pages = {art. 1679 [17 p.]},
  ISSN = {2072-4292},
  year = {2018},
  DOI = {10.3390/rs10111679},
  URL = {https://www.documentation.ird.fr/hor/fdi:010074764},
}