@article{fdi:010068331,
  title = {{A}bsolute and relative height-pixel accuracy of {SRTM}-{GL}1 over the {S}outh {A}merican {A}ndean {P}lateau},
  author = {{S}atg{\'e}, {F}. and {D}enezine, {M}. and {P}illco, {R}. and {T}imouk, {F}ranck and {P}inel, {S}. and {M}olina, {J}. and {G}arnier, {J}. and {S}eyler, {F}r{\'e}d{\'e}rique and {B}onnet, {M}arie-{P}aule},
  editor = {},
  language = {{ENG}},
  abstract = {{P}reviously available only over the {C}ontinental {U}nited {S}tates ({CONUS}), the 1 arc-second mesh size (spatial resolution) {SRTM}-{GL}1 ({S}huttle {R}adar {T}opographic {M}ission - {G}lobal 1) product has been freely available worldwide since {N}ovember 2014. {W}ith a relatively small mesh size, this digital elevation model ({DEM}) provides valuable topographic information over remote regions. {SRTM}-{GL}1 is assessed for the first time over the {S}outh {A}merican {A}ndean {P}lateau in terms of both the absolute and relative vertical point-to-point accuracies at the regional scale and for different slope classes. {F}or comparison, {SRTM}-v4 and {GDEM}-v2 {G}lobal {DEM} version 2 ({GDEM}-v2) generated by {ASTER} ({A}dvanced {S}paceborne {T}hermal {E}mission and {R}eflection {R}adiometer) are also considered. {A} total of approximately 160,000 {ICES}at/{GLAS} ({I}ce, {C}loud and {L}and {E}levation {S}atellite/{G}eoscience {L}aser {A}ltimeter {S}ystem) data are used as ground reference measurements. {R}elative error is often neglected in {DEM} assessments due to the lack of reference data. {A} new methodology is proposed to assess the relative accuracies of {SRTM}-{GL}1, {SRTM}-v4 and {GDEM}-v2 based on a comparison with {ICES}at/{GLAS} measurements. {S}lope values derived from {DEM}s and {ICES}at/{GLAS} measurements from approximately 265,000 {ICES}at/{GLAS} point pairs are compared using quantitative and categorical statistical analysis introducing a new index: the {F}alse {S}lope {R}atio ({FSR}). {A}dditionally, a reference hydrological network is derived from {G}oogle {E}arth and compared with river networks derived from the {DEM}s to assess each {DEM}'s potential for hydrological applications over the region. {I}n terms of the absolute vertical accuracy on a global scale, {GDEM}-v2 is the most accurate {DEM}, while {SRTM}-{GL}1 is more accurate than {SRTM}-v4. {H}owever, a simple bias correction makes {SRTM}-{GL}1 the most accurate {DEM} over the region in terms of vertical accuracy. {T}he relative accuracy results generally did not corroborate the absolute vertical accuracy. {GDEM}-v2 presents the lowest statistical results based on the relative accuracy, while {SRTM}-{GL}1 is the most accurate. {V}ertical accuracy and relative accuracy are two independent components that must be jointly considered when assessing a {DEM}'s potential. {DEM} accuracies increased with slope. {I}n terms of hydrological potential, {SRTM} products are more accurate than {GDEM}-v2. {H}owever, the {DEM}s exhibit river extraction limitations over the region due to the low regional slope gradient.},
  keywords = {{D}igital elevation model ; {SRTM} ; {A}ccuracy ; {S}outh {A}merica ; {A}ndean {P}lateau ; {AMERIQUE} {DU} {SUD} ; {BOLIVIE} ; {PEROU} ; {CHILI} ; {ANDES} ; {TITICACA} {LAC} ; {POOPO} {LAC} ; {DESAGUADERO} {COURS} {D}'{EAU} ; {UYUNI} {SALAR}},
  booktitle = {},
  journal = {{ISPRS} {J}ournal of {P}hotogrammetry and {R}emote {S}ensing},
  volume = {121},
  numero = {},
  pages = {157--166},
  ISSN = {0924-2716},
  year = {2016},
  DOI = {10.1016/j.isprsjprs.2016.09.003},
  URL = {https://www.documentation.ird.fr/hor/fdi:010068331},
}