Urbanization and Land Cover Change in Dakota County, MinnesotaKylee Berger and Julia VangFR 3262 Remote SensingSection 001/002

Objectives

Locate the land cover changes, per pixel, in Dakota County, MN from 1984 to 2005

Determine the relationship between urban growth, agriculture and vegetation.

Area of Study

Dakota County, Minnesota

Materials, Tools, and Data

Landsat TM images 1984 2005

MN Data Deli ArcGIS ERDAS Imagine 2011 Dakota County GIS

Methodology In ERDAS- changed Landsat imagery to UTM

zone 15 N In ERDAS- clipped Dakota county out of our

twin cities Landsat images Ran supervised classification on both 1984 and

2005 images Ran Thematic Change detection

“From-to” detection Imported to Arc GIS to display where the changes

between the years occurs using transparency Performed accuracy assessment of both

images

Classification Supervised classification

20 training points for all 6 Classes Urban Agriculture Water Wetland Herbaceous Forest

Dakota County 1984 Classified

  URBAN

  FOREST

  AGRICULTURE

  HERBACOUS

  WETLAND

  WATER

Dakota County 2005 Classified

  URBAN

  FOREST

  AGRICULTURE

  HERBACOUS

  WETLAND

  WATER

Thematic Change Detection Ran a Matrix Union to find all the

changed pixels Used “Summary Report of Matrix” to see

the percent of change and the number of acres that changed Focused on what classes changed to

urban and agriculture

Thematic Change Detection

  URBAN

  AGRICULTURE

  HERBACOUS/FOREST

  WATER/WETLAND

Percent Change to Urban

  Change Area, Acres  

1984-2005 Percent (%) Acres

Forest to Urban 12.4 2,560

Herbacous to Urban 26.4 26,465

Agriculture to Urban 10.4 15,487

Wetland to Urban 13.5 1,451

Water to Urban 18.5 1,532

Percent Change to Agriculture

  Change Area, Acres  

1984-2005 Percent (%) Acres

Forest to Agriculture 37.1 17,283

Herbaceous to Agriculture 31.2 31,242

Wetland to Agriculture 30.2 2,500

Water to Agriculture 9.9 1,068

Urban to Agriculture 20.5 12,488

Accuracy Assessment 1984 Classification Accuracy of 68.6%

Class Reference Classified Number Producers Users

Name Totals Totals Correct Accuracy Accuracy

FOREST 12 11 9 75.00% 81.82%

URBAN 12 12 9 75.00% 75.00%

AGRICULTURE 16 14 9 56.25% 64.29%

HERBACOUS 14 13 10 71.43% 76.92%

WETLAND 6 10 3 50.00% 30.00%

WATER 10 10 8 80.00% 80.00%

Totals 70 70 48    

Accuracy Assessment 2005

Class Reference Classified Number Producers Users Name Totals Totals Correct Accuracy Accuracy Urban 10 12 8 80.00% 66.67%

Agriculture 20 14 11 55.00% 78.57% Herbaceous 9 13 5 55.56% 38.46%

Wetland 5 10 4 80.00% 40.00% Water 10 10 10 100.00% 100.00%

Forest 16 11 11 68.75% 100.00%Totals 70 70 49

Classification Accuracy Percent of 70.0%

Conclusions The land use/cover in Dakota County,

MN like almost everywhere is being developed into Urban areas and Agriculture fields.

Forests and Herbaceous lands are being developed to support the growing population

Future Studies Images with less or zero percent cloud

cover Images where dates/years all match up Better knowledge of programs, images,

and study area Create an error matrix

Questions?