@article{fdi:010040915,
  title = {{E}valuating digital elevation models for glaciologic applications: {A}n example from {N}evado {C}oropuna, {P}eruvian {A}ndes},
  author = {{R}acoviteanu, {A}. {E}. and {M}anley, {W}. {F}. and {A}rnaud, {Y}ves and {W}illiams, {M}. {W}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}his paper evaluates the suitability of readily available elevation data derived from recent sensors - the {A}dvanced {S}paceborne {T}hermal {E}mission and {R}eflection {R}adiometer ({ASTER}) and the {S}huttle {R}adar {T}opography {M}ission ({SRTM}) - for glaciological applications. {T}he study area is {N}evado {C}oropuna (6426 m), situated in {C}ordillera {A}mpato of {S}outhern {P}eru. {T}he glaciated area was 82.6 km(2) in 1962, based on aerial photography. {W}e estimate the glacier area to be ca. 60.8 km(2) in 2000, based on analysis of the {ASTER} {LIB} scene. {W}e used two 1:50,000 topographic maps constructed from 1955 aerial photography to create a digital elevation model with 30 in resolution, which we used as a reference dataset. {O}f the various interpolation techniques examined, the {TOPOGRID} algorithm was found to be superior to other techniques, and yielded a {DEM} with a vertical accuracy of +/- 14.7 m. {T}he 1955 {DEM} was compared to the {SRTM} {DEM} (2000) and {ASTER} {DEM} (2001) on a cell-by-cell basis. {S}teps included: validating the {DEM}'s against field {GPS} survey points on rock areas; visualization techniques such as shaded relief and contour maps; quantifying errors (bias) in each {DEM}; correlating vertical differences between various {DEM}'s with topographic characteristics (elevation, slope and aspect) and subtracting {DEM} elevations on a cell-by-cell basis. {T}he {RMS} error of the {SRTM} {DEM} with respect to {GPS} points on non-glaciated areas was 23 m. {T}he {ASTER} {DEM} had a {RMS} error of 61 m with respect to {GPS} points and displayed 200-300 m horizontal offsets and elevation 'spikes' on the glaciated area when compared to the {DEM} from topographic data. {C}ell-by-cell comparison of {SRTM} and {ASTER}-derived elevations with topographic data showed ablation at the toes of the glaciers (-25 m to -75 m surface lowering) and an apparent thickening at the summits. {T}he mean altitude difference on glaciated area ({SRTM} minus topographic {DEM}) was - 5 m, pointing towards a lowering of the glacier surface during the period 1955-2000. {S}purious values on the glacier surface in the {ASTER} {DEM} affected the analysis and thus prevented us from quantifying the glacier changes based on the {ASTER} data.},
  keywords = {digital elevation model {DEM} ; geographic information systems {GIS} ; {A}ndes ; glaciology ; {DEM} generation ; {ASTER} ; {SRTM}},
  booktitle = {},
  journal = {{G}lobal and {P}lanetary {C}hange},
  volume = {59},
  numero = {1-4},
  pages = {110--125},
  ISSN = {0921-8181},
  year = {2007},
  DOI = {10.1016/j.gloplacha.2006.11.036},
  URL = {https://www.documentation.ird.fr/hor/fdi:010040915},
}