estimation tool for impervious surfaces (etis) anna chabaeva jason parent daniel civco department of...

Estimation Tool for Estimation Tool for Impervious Surfaces Impervious Surfaces

(ETIS)(ETIS)Anna Chabaeva Jason Parent Daniel Civco

Department of Natural Resources Management & Engineering

The University of ConnecticutU-4087, Room 308, 1376 Storrs Road

Storrs, CT 06269-4087

ObjectivesObjectives

Describe functionality of newly developed ETIS tool

Compare predicted amount of imperviousness to:

• highly accurate and precise planimetric data

• ISAT derived impervious surface data (NLCD, CCL)

• NLCD 2001 impervious surface layer

• CCL 2002 impervious surface layer

Impervious Surface Impervious Surface (IS)(IS)

The imprint of land development on the landscape:

Rooftops

• Buildings• Pools• Patios

Transportation System

• Roads• Sidewalks• Driveways• Parking lots

Influence of Impervious Surfaces Influence of Impervious Surfaces on Water Qualityon Water Quality

100

90

80

70

60

50

40

30

20

10

0

DEGRADED

PROTECTED

IMPACTED

WA

TE

RS

HE

D IM

PE

RV

IOU

SN

ES

S (

%)

ETIS – Regression ModelETIS – Regression Model

ii AbPopDenbb %IS 21

where - b1 is the IS-axis intercept

- b2 is the coefficient for population density

- bi are those for percentage of land cover category area within the tract- PopDen is the Population density- %Ai are the percent of the land cover category area

within the tract

Calibration Data221 NY tracts

Validation Data82 CT tracts

ETIS OverviewETIS Overview

IS for existing conditions

IS for changing conditions

ETIS Data RequirementsETIS Data Requirements

ETIS Data RequirementsETIS Data RequirementsLand CoverLand Cover

GRID, IMG, TIFF

ETIS Data RequirementsETIS Data RequirementsAnalysis UnitAnalysis Unit

SHP

ETIS Data RequirementsETIS Data RequirementsPercent Imperviousness EstimatesPercent Imperviousness Estimates

ETIS Data RequirementsETIS Data RequirementsPopulation DensityPopulation Density

People/sq mi

Preloaded

ETIS Data RequirementsETIS Data RequirementsCoefficientsCoefficients

DBF

ETIS Data RequirementsETIS Data RequirementsChange LayerChange Layer

SHP

ETIS ComparisonETIS Comparison

RMSE=8.09y = 1.2088x - 0.3007

R2 = 0.93970

20

40

60

80

100

0 20 40 60 80 100

Actual %IS

NLC

D S

ub-p

ixel

%IS

RMSE=7.72y = 1.2479x - 2.0241

R2 = 0.95180

20

40

60

80

100

0 20 40 60 80 100

Actual %IS

CC

L S

ub-p

ixel

%IS

RMSE=4.37y = 0.8431x + 4.1378

R2 = 0.94060

20

40

60

80

100

0 20 40 60 80 100

Actual %IS

NLC

D IS

AT %

IS

RMSE=4.22y = 0.977x + 1.823

R2 = 0.94190

20

40

60

80

100

0 20 40 60 80 100

Actual %IS

NLC

D E

TIS

%IS

RMSE=4.73y = 0.8548x + 2.763

R2 = 0.92910

20

40

60

80

100

0 20 40 60 80 100

Actual %IS

CC

L E

TIS

%IS

RMSE=6.30y = 0.7088x + 5.1551

R2 = 0.93510

20

40

60

80

100

0 20 40 60 80 100

Actual %IS

CC

L IS

AT %

IS

RMSE R-squared

NLCD Sub-pixel 6.84 0.93

CCL Sub-pixel 10.88 0.95

NLCD ISAT 5.26 0.94

CCL ISAT 7.23 0.91

NLCD ETIS 3.61 0.95

CCL ETIS 5.09 0.91

ETIS Web SiteETIS Web Site

http://clear.uconn.edu/tools/geospatial/etis/index.html

ETIS DownloadETIS Download

http://clear.uconn.edu/tools/geospatial/etis/index.html

Estimation Tool for Estimation Tool for Impervious Surfaces Impervious Surfaces

(ETIS)(ETIS)Anna Chabaeva Jason Parent Daniel Civco

Department of Natural Resources Management & Engineering

The University of ConnecticutU-4087, Room 308, 1376 Storrs Road

Storrs, CT 06269-4087anna.chabaeva@uconn.edu