measuring ice l oss of iceland s m rdalsj kull glacier
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Measuring Ice L oss of Iceland’s Mýrdalsjökull Glacier. Joseph Blake and Laura Biersach. Mýrdalsjökull , 63 ° 40’ N., 19° 06’ W. It is the southern most glacier in Iceland 4,898 ft tall, 260 sq miles Sits on Kalta , a large active volcano

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Presentation Transcript
slide2

Mýrdalsjökull,

  • 63° 40’ N., 19° 06’ W.
  • It is the southern most glacier in Iceland
  • 4,898 ft tall, 260 sq miles
  • Sits on Kalta, a large active volcano
  • Erupts every 40-80 yrs, 16x since 930 a.d.
  • Experiences Jökulhlaups, major flooding
slide3

Objective

Introduction and Background

Methodology:

Data Collection

Pre-Processing

Classification

Change Detection

Accuracy Assessment

Results and Discussion

Implications

data collection september 1973 image
Data Collection:September 1973 Image
  • Landsat 1
  • Multispectral Scanner System
  • 4 spectral bands
  • 79 meter spatial resolution
data collection august 2006 image
Data Collection: August 2006 Image
  • Landsat 7
  • Enhanced Thematic Mapper Plus (ETM+)
  • 5 spectral bands
  • 30 meter spatial resolution
classification september 1973 image
Classification: September 1973 Image
  • We used unsupervised classifications
  • Did four classes: non-ice/dry land, melted ice, soft ice, and ice
classification august 2006 image
Classification: August 2006 Image

May 312003 the scan line corrector failed making it difficult to classify images properly

attribute tables
Attribute Tables
  • Different number of pixels because of different satellite capabilities
  • 1973 image has 3,412,189 pixels
  • 2006 image has 48,397,584 pixels
change detection
Change Detection
  • Percent change values done by class
  • Overall 3.2% change
change detection1
Change Detection
  • Using Polygon Geometry in ArcGIS
  • 1973 glacier was 304 sq miles
  • 2006 glacier was 266.5 sq miles
  • 37.5 square mile ice loss
accuracy assessment
Accuracy Assessment
  • Overall classification accuracy, 65 random points
  • 1973 image was 96% accurate
  • 2006 image was 75% accurate
problems
Problems
  • Classifier miss-classified data making percent change of pixels non-representative
  • Image availability
  • Landsat 1 vs. Landsat 7 images
  • Scan line error
  • Cloud cover
  • Creating Vector images for polygons
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