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<br />018L9 <br /> <br />. <br /> <br />Remote Sensing Before the Initiative <br /> <br />Aerial photography that - <br /> <br />- 6. '-cm resolution - in excess of most requirements. <br /> <br />- Only hardcol>Y - extrcmel)' difficnlt to access and <br />reproduce for usc and is degrading with time and <br />lIse. <br /> <br />- Uncontrolled - has to be performed by scicntists'!'! <br /> <br />- Somc aCI(uircd in summer. some in fall (shadows). <br /> <br />- Mix of natnral color. B&W. and color infrared. <br /> <br />12USGS~ <br />-..-- <br /> <br />. <br /> <br />. <br /> <br /> <br />3 <br />