georeferencing and googleearth francisco olivera, ph.d., p.e. celso ferreira department of civil...
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![Page 1: Georeferencing and GoogleEarth Francisco Olivera, Ph.D., P.E. Celso Ferreira Department of Civil Engineering Texas A&M University](https://reader035.vdocuments.net/reader035/viewer/2022081520/56649d2e5503460f94a05ad8/html5/thumbnails/1.jpg)
Georeferencing and GoogleEarth
Francisco Olivera, Ph.D., P.E.Celso Ferreira
Department of Civil EngineeringTexas A&M University
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Overview
Georeferencing using ArcGIS
Visualizing data in Google Earth
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Georeferencing:
Acquiring a digital image
Importing images in ArcGIS
Defining control points
Resampling the image
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Acquiring Imagese.g.: Brazos County Aerial Photos from 1940
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Georeferencing Concepts
Source: ESRI Help
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Georeferencing Concepts
Source: ESRI Help
Real World Coordinates
Original Image Raster
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Georeferencing GoogleEarth Images
Find control points in Image
Get coordinates for each point
Use Georeferencing toolbar for adjusting the image
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Demo: Georeferencing Images using ArcGIS
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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
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GoogleEarth:
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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
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Preparing the data
General geoprocessing procedures
Identify, clip, intersect, union…
Make sure to “clean up the data” and select appropriate area
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Generating KML
Conversion Tools>>To KML>>Layer to KML
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Importing KMLIn GoogleEarth Open KML
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Examples – Watershed delineation
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Examples – Watershed delineation
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Demo: Visualizing data using GoogleEarth
Data available from:Dr. Olivera home page / Geomatics in Civil Engineering
(CVEN 423) / Spring 2009https://ceprofs.civil.tamu.edu/folivera/CVEN423/
Spring2009/home.htm
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Questions ?