David J. Weary and Robert C. McDowell, 2006, Geologic map of the Big Spring quadrangle, Carter County, Missouri: U.S. Geological Survey Scientific Investigations Map 2804, U.S. Geological Survey, Reston, VA, USA.Online Links:
This is a Vector data set. It contains the following vector data types (SDTS terminology):
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.000032
Ordinates (y-coordinates) are specified to the nearest 0.000032
Planar coordinates are specified in meters
The horizontal datum used is North American Datum of 1983.
The ellipsoid used is Geodetic Reference System 80.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257222.
Coordinates defining the features.
Sequential unique whole numbers that are automatically generated.
Positive real numbers that are automatically generated.
Positive real numbers that are automatically generated.
Sequential unique whole numbers that are automatically generated.
Coordinates defining the features.
Positive real numbers that are automatically generated.
Positive real numbers that are automatically generated.
Sequential unique whole numbers that are automatically generated.
Sequential unique whole numbers that are automatically generated.
Coordinates defining the features.
Sequential unique whole numbers that are automatically generated.
703-648-6897 (voice)
dweary@usgs.gov
The map data supports the production of a geological framework that will be used in hydrogeologic investigations related to potential lead and zinc mining in the Mark Twain National Forest adjacent to the Ozark National Scenic Riverways (National Park Service). Digital geologic coverages will be used by other federal and state agencies in hydrogeologic analyses of the Ozark karst system and in ecological models.
Data sources used in this process:
Data sources used in this process:
Data sources used in this process:
All polygon atrtributes were checked for correct values against original field data by the geologists.
These data were created by delineating the boundaries from inked lines on a stable-base USGS 7.5 minute topographic map at 1:24,000 scale. Therefore, the mapped horizontal accuracy is assumed to be within National Map Accuracy Standards, with a horizontal accuracy of 45.6 feet at the 95% confidence level. As with all things human, potential exists for error in location by the mapper in the field especially as most ground locations were plotted manually without aid of GPS, surveying or other precise locating equipment.
These data were created by delineating the boundaries from inked lines on a stable-base USGS 7.5 minute topographic map at 1:24,000 scale. Therefore, the mapped horizontal accuracy is assumed to be within National Map Accuracy Standards, with a horizontal accuracy of 11.9 feet at the 95% confidence level. As with all things human, potential exists for error in location by the mapper in the field especially as many ground locations were plotted manually without the aid of GPS, surveying, or other precision locating equipment. Most vertical positions derived from the plotted horizontal position on the topographic base
The data are complete at a resolution of 1:24,000
These data are believed to be logically consistent, though no rigorous formal test were performed. Polygon coverages were queried to screen for empty or inconsistent values. Line geometry is topologically clean.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None with proper citation
- Use_Constraints:
- Although all data and software released on this CD-ROM have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and (or) the functioning of the software. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
703-648-6897 (voice)
dweary@usgs.gov
Downloadable Data
Data format: | Size: 0.342 |
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Download at: <http://pubs.usgs.gov/imap/i2804/>. CD with data may be requested from dweary@usgs.gov.
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