1. Georeferencing and GoogleEarth Francisco Olivera, Ph.D., P.E. Celso Ferreira Department of Civil Engineering Texas A&M University

2. Overview Georeferencing using ArcGIS Visualizing data in Google Earth

3. Georeferencing: Acquiring a digital image Importing images in ArcGIS Defining control points Resampling the image

4. Acquiring Images e.g.: Brazos County Aerial Photos from 1940

5. Georeferencing Concepts Source: ESRI Help

6. Georeferencing Concepts Source: ESRI Help

7. Georeferencing GoogleEarth Images Find control points in Image Get coordinates for each point Use Georeferencing toolbar for adjusting the image

8. Demo: Georeferencing Images using ArcGIS

9. 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

10. GoogleEarth:

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

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

13. Generating KML Conversion Tools>>To KML>>Layer to KML

14. Importing KML In GoogleEarth Open KML

15. Examples – Watershed delineation

17. 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/Spring200 9/home.htm

18. Questions ?