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Georeferencing and GoogleEarth. Francisco Olivera, Ph.D., P.E. Celso Ferreira Department of Civil Engineering Texas A&M University. Overview. Georeferencing using ArcGIS Visualizing data in Google Earth. Georeferencing :. Acquiring a digital image Importing images in ArcGIS

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georeferencing and googleearth

Georeferencing and GoogleEarth

Francisco Olivera, Ph.D., P.E.

Celso Ferreira

Department of Civil Engineering

Texas A&M University

slide2

Overview

  • Georeferencing using ArcGIS
  • Visualizing data in Google Earth
slide3

Georeferencing:

  • Acquiring a digital image
  • Importing images in ArcGIS
  • Defining control points
  • Resampling the image
slide4

Acquiring Images

e.g.: Brazos County Aerial Photos from 1940

slide5

Georeferencing Concepts

Source: ESRI Help

slide6

Georeferencing Concepts

Real World Coordinates

Original Image Raster

Source: ESRI Help

slide7

GeoreferencingGoogleEarth Images

  • Find control points in Image
  • Get coordinates for each point
  • Use Georeferencing toolbar for adjusting the image
slide9

Exercise Outline:

  • Goal: Find Reed Arena geographical location using a 1940 aerial photograph
  • Load the georeferenced layers
  • Load the 1940 Image
  • Georeference the image
  • Delineate a polygon around Reed Arena
slide11

GoogleEarth:

  • Preparing the data in ArcGis
  • Exchanging data:
  • Keyhole Markup Language (KML) is an XML-based language schema
  • Generating KML files from ArcGis
  • Importing KML files in GoogleEarth
slide12

Preparing the data

  • General geoprocessing procedures
  • Identify, clip, intersect, union…
  • Make sure to “clean up the data” and select appropriate area
slide13

Generating KML

  • Conversion Tools>>To KML>>Layer to KML
slide14

Importing KML

  • In GoogleEarth Open KML
slide17

Demo: Visualizing data using GoogleEarth

  • Data available from:
  • Dr. Olivera home page / Geomatics in Civil Engineering (CVEN 423) / Spring 2009
  • https://ceprofs.civil.tamu.edu/folivera/CVEN423/Spring2009/home.htm