By Bradley Shellito
This ebook is a smart introductory advisor to GIS and distant Sensing.
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Additional info for Introduction to Geospatial Technologies
Example text
6 Note that even though the graphic contains the locations of Mount Rushmore, the outline of the park, and latitude/longitude and elevation information at the bottom, it doesn’t have any spatial reference for measurements. Why is this? 4. indd 22 Close the image and return to Google Earth. Even though the saved image doesn’t have any spatial reference, Chapter 3 describes how to take unreferenced imagery (or other unreferenced data) and transform it to match referenced data. In Chapter 3’s lab, you do this in a hands-on fashion.
In the Ruler dialog box that appears, select Feet from the Length pulldown menu. 10. Use the options under the Line tab. This will let you compute the distance between two points. The Path option will let you find the total accumulated distance between more than two points. 11. Click the mouse on the point of the placemark in the amphitheater and drag it to the placemark on top of the mountain (your heading should be about 310 degrees or so). Click the mouse at the top of the mountain placemark.
This chapter examines how these concepts are treated in all forms of geospatial technology. If you’re going to be able to precisely pin down the coordinates of a location, you’ll need to first have a datum and a coordinate system. What Is a Datum? datum a reference surface of Earth. ellipsoid a model of the rounded shape of Earth. geoid a model of Earth using mean sea level as a base. geodesy the science of measuring Earth’s shape. A datum is a reference surface, or model of Earth that is used for plotting locations across the globe.