REPORTIDW Kriging SplineMedia -0.291 -0.135 0.048Varianza 2.530 0.459 0.632Max_Ass 3.032 1.065 5.464Tab. 3 – Residuals on the different interpolator models.Based on the evaluated residues,it was preferred to operateusing the Kriging algorithmon all available datasets.Ablation analysis(2020 vs 2019)The altimetric differences estimation,highlights a discretevariability of the snow surface.This variable becomesimportant if assessed in relationto the short period of timeelapsed between the two findings(13 months). The ablationis significant on the whole areasubject to RTK investigations,with average values in the orderof 4-5 meters.Significant area variations werealso found.Fig. 6 shows the variation betweenthe ortho-image of the2019 and 2020 campaigns:In this, the digitization performedon the basis of the orthophotoof the year 2020 (B),is compared with the orthophotoof the year 2019 (A).This simple analysis highlightsthe retreat of the ice (the mixedland-ice areas are highlightedwith a dotted background).The difference mentionedabove, in linear terms, in variouscases reaches hundreds ofmeters.When considering the uncoveredterrain, less significantdifferences are observed, especiallywhen compared withthe phenomenon previouslydescribed.An interesting detail is easilyappreciated in the North-Westarea (Fig. 7), in this, the limitsof the frozen area, (highlightedby the arrow), show an advanceof the surface towardsthe sea, a sign of an evidentspillage phenomenon.This collapse affects a largearea with an advancement ofthe front of about 70 m.Future projectionsThis surfaces study, highlightsa huge decrease in the ice massduring the year 2020 comparedto the year 2019, and inthe same period a significantprocess of the transfer into thesea, probable consequence of aglacial collapse.As mentioned above, giventhe obvious limitations of theDEM models derived fromphotogrammetry, only theRTK survey was used for modelgeneration.While representing a robustmethodology, going throughglaciers by foot with geodesictools has at least three criticalissues:4not adequate for the analysisof large extensions;4difficult to repeat due to thehostility of the surroundingenvironment;4high risk for the safety of thepersonnel involved in the executionof the survey.The hope is to overcome thelimitations and problems mentionedabove in the comingcampaigns, through the integrationof LiDAR systems tobe used in the analysis of largersurfaces.AcknowledgmentsThe authors thank General deBrigada Fernando PORTILLOROMERO, Jefe of the InstitutoGeográfico Nacional of Peru.REFERENCESGARNERO, G.; GODONE, D.(2013) Comparisons between differentinterpolation techniques, The InternationalArchives of the Photogrammetry,Remote Sensing and Spatial InformationSciences, Volume XL-5/W3 (ISSN: 2194-9034), Pagg. 139-144 [DOI: 10.5194/isprsarchives-XL-5-W3-139-2013,WOS:000358309600021, SCOPUS:2-s2.0-84924290459].MOTTA, M.; DIOLAIUTI, G.; VAS-SENA, G.; SMIRAGLIA, C. (2003) Massbalance and Energy balance at StrandlineGlacier (Terra Nova Bay, Antarctica):Methods and preliminary results, Proceedingsof the 4th Meeting on Italian AntarcticGlaciology, Terra Antarctica reports n.8,Editors: Massimo Frezzotti & Valter Maggi,pp. 21-28, Siena.WEBGRAPHYhttps://www.enea.it/it/seguici/pubblicazioni/pdf-volumi/2019/xxxiv_spedizione_antartide.pdfhttps://elcomercio.pe/tecnologia/ciencias/comercio-antartida-retroceso-glaciarznosko-noticia-611907-noticia/https://www.cnbc.com/2020/04/30/climate-change-antarctica-greenland-ice-melt-raised-sea-levels-by-half-inch-in-last-16-years.htmlhttps://www.theguardian.com/environment/2020/mar/11/polar-ice-caps-meltingsix-times-faster-than-in-1990shttps://www.scientificamerican.com/article/heres-how-much-ice-antarctica-is-losingmdash-its-a-lot1/https://climate.nasa.gov/vital-signs/icesheets/KEYWORDSAntarctica; survey; geodesic network;geospatial; DEM; glacial mass balanceABSTRACTThe study and analysis of climate changeis a global challenge against which environmental,but also economic and socialchanges, will be measured.This memorandum illustrates the recentactivities carried out by the IGN Peru incollaboration with European institutions.AUTHORFabian Brondi Ruedafabianbrondi@hotmail.comIGN - Instituto Geográfico Nacional,Lima (PE)Gabriele Garnerogabriele.garnero@unito.itDIST – Politecnico e Università degliStudi di Torino (ITA)Giovanni Righettig.righetti@medsamsterdam.euStefano Serafinis.serafini@medsamsterdam.euMEDS BV – Hengelo (NL)38 GEOmedia n°3-2020
REPORTBlending the Science of Geographyand Technology of GISwww.esriitalia.itGEOmedia n°3-2020 39
- Page 1 and 2: Rivista bimestrale - anno XXIV - Nu
- Page 3 and 4: The “everything digital” geospa
- Page 5 and 6: ADVPositioning, Navigationand Timin
- Page 7 and 8: FOCUSmajor earthquakes. With thisin
- Page 9 and 10: Via Balilla 192Canosa di Puglia (BT
- Page 11 and 12: FOCUSmes, in or outside Data Cubes,
- Page 13 and 14: FOCUSAgriculture and EarthObservati
- Page 15 and 16: FOCUSin collaborazione conIl Serviz
- Page 17 and 18: REPORT• “ad hoc”, flexible, e
- Page 19 and 20: REPORTcording to the requirements f
- Page 21 and 22: REPORTGEOmedia n°3-2020 21
- Page 23 and 24: SPACE AND EARTHspacecraft developed
- Page 25 and 26: NEWSESA - Gulf of Kutch, IndiaSepte
- Page 27 and 28: REPORTPlanetek Italia, ZAMG, BRGM,G
- Page 29 and 30: REPORTBIM PER LE INFRASTRUTTURERein
- Page 31 and 32: AUGMENTED REALITYbasic applications
- Page 33 and 34: GeoMax Zenith35 Tilt & GoGNSS Recei
- Page 35 and 36: REPORTFig. 2 - The environmentof Zn
- Page 37: REPORTFig. 6 - Comparisons between
- Page 41 and 42: TELERILEVAMENTONEWSTHE NEW FACE OF
- Page 43 and 44: AEROFOTOTECAnew, with pioneering wo
- Page 45 and 46: AEROFOTOTECAREFERENCESBradford, J.S
- Page 47: Hall: 25Booth: C25.68S980IMU | E-BU
Change language