new mt. aconcagua – a challenge for remote sensing mapping … · 2015. 9. 14. · puente del...
TRANSCRIPT
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Mt. Aconcagua –A Challenge for Remote Sensing Mapping
Activities in the Andes
Wolfgang SULZER* and Robert KOSTKA**
* Institute for Geography and Regional Science Karl Franzens University Graz
Heinrichstraße 36A-8010 Graz, Austria; www.uni-graz.at/geowww
** Institute for Photogrammetry and Remote SensingTechnical University Graz
Steyrergasse 34A-8010 Graz, Austria; www.tugraz.at/geoimaging
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Content
Introduction - Motivation
A challenge for Remote Sensing
Investigation Area
Available Geodata
Generation of DEM
DEM derivates and contour lines
Results and further investigations
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HMRSC (High Mountain Remote Sensing Cartography) 1994
Motivation
Book of Aconcagua by R. Kostka
Universidad de Mendoza (11/2003)
- Generation of a (Satellite based image) Map 1:100.000
- Geographical Topics about Aconcagua Region
Challenge for Remote Sensing
- High Mountain Environment
- Lack of Geodata
- Providing a basic database for a cartographic product of the region
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What kind of requirements ?
basics for the map (1:100.000)
• Contourlines --------- Source : DEM: ASTER/SRTM/LANDSAT
• Image-line-Information ------------Source: ASTER/LANDSAT
• Vegetation cover -------------------Source : LANDSAT/ASTER
• Traffic network -------------- Source : GPS/LANDSAT/ASTER
multitemporal and multisensoral data set
• Glacier/Lakes ---------------------- Source : LANDSAT/ASTER
• perspective views ---------- Source : DEM/LANDSAT/ASTER
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• High Mountain Areas are regions, which are especially suitable for providing surface information by means of Remote Sensing.
• Remoteness, inaccessibleness and high relief are inconvenient for terrestrial methods.
• Remote Sensing techniques provide useful tools for a full cover and especially for height related interpolation of local – field based acquired.
• Due to their touchlessness and spatial extent, aerial photographs and satellite images get an increasing acceptation for many mountain related topics (LULUC, change detection, hazards, …).
Remote Sensing in High Mountain Environment
Challenge for Remote Sensing
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Typical data based problems in high mountain areas
• “insufficient” topographic maps
• general lack of geodata
• non documented analogue dataset
• few thematically products
• low spatial cover
• lack of actuality
• relief, climate, geometric aspects,
Challenge for Remote Sensing
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What is the need of RS in high mountains ?
• suitable data basis for processing (rectification, image/GIS analyses and presentation)
• suitable weather and season
• suitable sensors
• skilled user (Processing – Analyse – Presentation)
- Image processing/GIS
- Knowledge about natural and cultural environment
- Cartographic skills
- G/S/R/T -resolution
- (digital) topographic maps
- DEM, …
- fieldwork
- “nice” weather (RADAR!)
- less snow
Challenge for Remote Sensing
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Investigation Area
Cerro Aconcagua: 6962m
Highest mountain:
• of America• southern hemisphere• outside Asia • western hemisphere
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• Volcanic basement
• no active volcanoes
Investigation Area
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Aconcagua Watershed
Atlantic Ocean
PazificOcean
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Cerro Aconcagua: 6962m
Investigation Area
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Available Geo-Data
Topographic Maps• Chile• Argentina
DEM • ASTER• SRTM• LANDSAT
Remote Sensing Data• aerial photographs• LANDSAT• ASTER• …
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Topographic Maps – Argentina and Chile
Topographic Maps with scale: 1:500 000, 1:250 000, 1:100 000 and 1:50 000
Aconcagua Region: 1:50 000 and 1:100.000 of IGM in Buenos Aires/ Santiago de Chile
Further Processing:
Scan
Geocoding/ Mosaicing
Digitalise contour lines/height spots, drainage system
DEM Generation
Available Geo-Data
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Topographic Maps -Argentina
Sheet: 3369-7-4 CERRO ACONCAGUA (70°00’W-70°15’W/32°30’S-32°40’S)Sheet: 3369-8-3 CERRO AMEGHINO, 69°45’W-70°00’W/32°30’S-32°40’S
including) 3369-8-4 CUMBRE DEL YALGUARAZSheet: 3369-13-2 LAS CUEVAS, 70°00’W-70°15’W/32°40’S-32°50’SSheet: 3369-14-1 PUENTE DEL INCA, 69°45’W-70°00’W/32°40’S-32°50’S
including: 3369-14-2 POLVAREDASSheet: 3369-14-3 PUNTA DE VACAS, 69°45’W-70°00’W and 32°50’S-33°00’SSheet: 3369-14-3 PUNTA DE VACAS, 69°45’W-70°00’W and 32°50’S-33°00’SSheet: 3369-14-3 PUNTA DE VACAS, 69°45’W-70°00’W and 32°50’S-33°00’SSheet: 3369-14-4 CERRO DE LA BATEA
Available Geo-Data
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Topographic Maps – Chile
Availability: Analogue and digital
Available Geo-Data
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Legend, colour edition, Equidistance: 25m, 100m; rock representationRepresentation
19521951195119511950Edition
-1929, 1943/44/45,
1948/49
1924-1929, 1944, 1945
1924, 19451929, 19451924, 1929, 1945
Terrestrial Photogrammetry
No informationNo informationNo informationNo informationNo informationGeodetic System
PUNTA DE VACAS
PUENTE DEL INCA
LAS CUEVASCERRO AMEGHINO
CERRO ACONCAGUA
ARGENTINIEN:1:50K
1964Fieldwork
Legend, colour edition, Equidistance : 50m, 250m; rock representationRepresentation
19941985Edition
19811977Revision
1955Aerial Photograph:
International Ellipsoid 1924, UTM-Projection, Meridian 69°W,
Latidute:10 000km south of Equator, height: Nivel Medio del Mar
Geodetic System
PORTILLORIO DE LOS LEONESCHILE:1:50K
Topographic Maps – Argentina and ChileAvailable Geo-Data
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Sheet: 3369-7-4 CERRO ACONCAGUA (70°00’W-70°15’W/32°30’S-32°40’S)
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Sheet: 3245-6958 PORTILLO, 69°58’W-70°15’W/32°45’S-33°00’S
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DEM
SRTM• SRTM Original• SRTM GTOPO30
ASTER• “public” Data• ASTER DEM generation
LANDSAT• Stereoscopic TM Scenes
Available Geo-Data
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SRTM Data
Available Geo-DataDEM
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SRTM Data
Available Geo-DataDEM
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Original SRTM DEM Data Processed SRTM DEM Data
SRTM Data
Available Geo-DataDEM
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SRTM Data
Available Geo-DataDEM
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2 available ASTER DEM:
Absolute DEM’s have extern GCP´s (provided by Kunden)
Relative DEM’s without any extern reference (GCP´s).
The horizontal and vertical accuracy varies between 7 and 10m. These values are situated within the toleranceith a scale of 1:250.000 to 1:50.000.
(ERSDAC 1999, ERSDAC 2001, USGS 2003).
ASTER Data
Available Geo-DataDEM
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ASTER Data
Available Geo-DataDEM
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ASTER 3b ASTER 3n
22.01.2004
Available Geo-DataDEM/ASTER Data
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1. Input Level 1a Daten 2. Radiometric Correction and image enhancement 3. Definition of Sensor parameter4. Definition of tie points5. Definition of GCP´s (X,Y: Topographic Maps: 1:50.000 and
LANDSAT-ETM+(P), Shaded Relief of SRTM; height spots: SRTM 6. Triangulation7. DEM Generation8. „Post processing“ (Aquality control, Filter, manual correction)9. Orthophoto generation10. Integration in STEREO ANALYST and quality analyses
Workflow
ASTER Data NEW
Available Geo-DataDEM
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Available Geo-DataDEM/ASTER
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ASTER “STRIPING” in E-W Exposition
Available Geo-DataDEM
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LANDSAT ETM+ Stereo Data
23 % Overlap
233/83 2002-03-21 232/83 2002-02-10
(Wurm Michael: 2004)
Available Geo-DataDEM
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LANDSAT ETM+ Stereo Daten
Verfügbare GEO-DATENHöhenmodelle
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Which features/attributes should be evaluated?
• Height (-difference),
• Height related „features“ (Exposition and Inclination)
• additional derivates (Plancurvature, Profilecurvature)
Evaluation - Methodology
Cf.: Gspurning/Sulzer, 2004)
Available Geo-DataDEM
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Evaluation
• no terrestrial reference model available
• Accuracy lies within the specification of data definition
• Well known limits of used data sets - „Striping“ of ASTER-Data - reduced applicability of LANDSAT Stereo analyses- SRTM resolution of 100m - North exposed slopes with „zero data values“ (ASTER, SRTM)- High mountain environment (snow, shadow, relief, clouds, dust, etc.)
Available Geo-DataDEM
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Combined analyse of multitemporal and multisensoral DEM`s
DEM 2001 DEM 2003
Available Geo-DataDEM
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Fill up and reduction of the aerial extent of “zero-data-values”
DEM 2001 DEM 2003
Combined analyse of multitemporal and multisensoral DEM`s
Available Geo-DataDEM
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SRTM DEM ETM+ DEM
DEM NEW
ASTER DEM
Available Geo-DataDEM
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Available Geo-DataDEM
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Glacier inventory of Argentina LANDSAT 2002 /543
GÜSSFELD
Ventisquerode les Vacas
Glacier/Lakes
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Glacier Map 1974 (1:25.000)
ASTER 2004
Glacier/Lakes
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LANDSAT 2002
Glacier/Lakes
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Glacier(Snow-)Mask
Glacier/Lakes
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Vegetation
Vegetation index LANDSAT Vegetation Mask
Vegetation Mask
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Traffic Network
regional street network
GPS/ASTER
ASTER
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Perspective Views
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DEM
Gla
cier
-an
d la
ke m
ask
Vege
tati
on m
ask
Traf
fic
netw
ork
Results and further investigations
Cont
our
Line
s
Nam
es,
etc.
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Results and further investigations
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Results and further investigations
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Results and further investigations
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• The aim of this project is to provide basic data base for the generation of a map in scale 1:100.000.
• The compilation (pre-processing, merging, raster to vector conversation, evaluation, etc.) of the geodata are most suitable for the generation of a (topographic) SAT-MAP 1:100.000.
• The most suitable way for the map creation is an out weighted relationship between time/costs and the achieved quality of the results.
• The presented study must be seen as an intermediate result.
• Further investigations/work are: - finale digital compilation for printing - WEB MAP
• This has been done by means of a multisensoral (ASTER/SRTM/LANDSAT) and multitemporal (2000-2004) data set.
Results and further investigations
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Thank you for your attention !