![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiep2OsKPgX34pV4jAoClPn2hMjC4qEMs9UElUOZrsnAOcFTMdkUYXHYdAYdlIY78Ub-ujqMooxnR_TZJJZKdDVodMq-hiCU0Dlh_2MIM05tovjfejd5AVTqV53jGOslJJa3a9lsoVmEvkF/s400/drg.gif)
This DRG (digital raster graphic) is of the Colorado River. Typically these types of maps are scanned images of topographic maps. I can imagine this being useful for professionals in the field of water & land conservation, to have a detailed image of the land they are working with.
URL:http://www.tceq.state.tx.us/gis/drg.html
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