GIS 255 – REMOTE SENSINGPROFESSOR STEPHANIE C. DOCKSTADER

Asha Katti, NVCC

https://ashakatti.wordpress.comhttp://nova-cc.maps.arcgis.com/home/organization.html#

URBAN CHANGE IN GILBERT, ARIZONA

A Remote Sensing Application

Gilbert Town, A Transformation from “Hay Capital” to the “Best Place to Live”

Past Present

Gilbert Town, outside of Phoenix MSA, in Maricopa County, Arizona

Landsat Data

1979 2010

Remote Sensing Project Workflow - Gilbert

Data Acquisition

Image Enhancement

Image Preprocessing

Subsetting of Region of Interest

Image Processing

Analysis Products

Blogging

Web App

Image Enhancement of 2015 Image

Without Stretch After 5 % Linear Stretch

Image Preprocessing & Subsetting

False Color Image (RGB 4, 3, 2)

1989 Image is Low

Resolution

Variation in Time of

Image Capture

Urban Density has

Increased over 25 Years

SWIR False Color(RGB 7, 5/4, 3/2)

1989 Low Spatial Resolution

Pink, Purple – Urban

Green – Vegetation

Dark Blue – Water

Loss in farm Land is Discernible

Image Processing- Supervised Classes

Mixed Uses – Built-Up, Agricultural, Water

Multispectral Image-2015 High Resolution Image

Lake Front Properties, Landscaping, Roads

Multispectral Image-2015 High Resolution Image

Processing – Unsupervised Classification

Gilbert,2000 : False Color & High Resolution

Image Interpretation

SWIR – Developed Land?? SWIR – Agricultural Land??

Gilbert, 2015 – Comparison of SWIR Color Composite and Unsupervised Classification

Analysis – Normalized Difference Built-up Ratio

Gilbert town –Year 2000 Gilbert Town -Year 2015

ArcGIS Online Story Map App

Time Series: Urban Change in Gilbert, 2000-2015