Urbanization and Land Cover Change in Dakota County, Minnesota Kylee Berger and Julia Vang FR 3262 Remote Sensing Section 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

URBAN FOREST AGRICULTURE HERBACOUS WETLAND WATER

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 DetectionThematic Change Detection URBAN AGRICULTURE HERBACOUS/FOREST WATER/WETLAND

Percent Change to Urban Change Area, Acres Percent (%)Acres Forest to Urban12.42,560 Herbacous to Urban26.426,465 Agriculture to Urban10.415,487 Wetland to Urban13.51,451 Water to Urban18.51,532

Percent Change to Agriculture Change Area, Acres Percent (%)Acres Forest to Agriculture37.117,283 Herbaceous to Agriculture31.231,242 Wetland to Agriculture30.22,500 Water to Agriculture9.91,068 Urban to Agriculture20.512,488

Accuracy Assessment 1984  Classification Accuracy of 68.6% Class ReferenceClassifiedNumberProducersUsers Name Totals Correct Accuracy FOREST %81.82% URBAN % AGRICULTURE %64.29% HERBACOUS %76.92% WETLAND %30.00% WATER % Totals70 48

Accuracy Assessment 2005 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?