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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Measuring Ice L oss of Iceland’s Mýrdalsjökull Glacier

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Measuring ice l oss of iceland s m rdalsj kull glacier

Measuring Ice Loss of Iceland’s Mýrdalsjökull Glacier

Joseph Blake and Laura Biersach


Measuring ice l oss of iceland s m rdalsj kull glacier

  • 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


Measuring ice l oss of iceland s m rdalsj kull glacier

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


Questions

Questions


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