USGS Geoscience Data Catalog
Additional USGS Geoscience data can be found by geographic location or by publication series.
This is a Vector data set. It contains the following vector data types (SDTS terminology):
Planar coordinates are encoded using coordinate pair
Planar coordinates are specified in METERS
The horizontal datum used is North American Datum of 1927.
The ellipsoid used is Clarke 1866.
The semi-major axis of the ellipsoid used is 6378206.4.
The flattening of the ellipsoid used is 1/294.98.
F.K. Miller, R.F. Burmester, D.M. Miller and R.E. Powell mapped the geology onto stable-base material; Optronics Specialty Co., Inc. scanned the geologic map and provided minimally attributed Arc/Info interchange-format files to the USGS; Pamela D. Derkey (USGS) imported the files in Arc/Info, transformed them to UTM zone 11 (with a y-shift) and attached and attributed an interim geologic map data model.
This dataset was developed to provide geologic map GIS of the Sandpoint 1:250,000 quadrangle for use in future spatial analysis by a variety of users.
This database is not meant to be used or displayed at any scale larger than 1:250,000 (e.g., 1:100,000 or 1:24,000).
Person who carried out this activity:
Person who carried out this activity:
Attribute accuracy was verified by manual comparison
of the source with hard copy printouts and plots.
The horizontal positional accuracy for the digital data is no
better than +/- 24 meters based on the transformation RMS error.
It was tested by visual comparison of the source with hard copy
All geologic units were mapped in the field at scales ranging from
1:24,000 to 1:62,500 and compiled at a scale of 1:250,000.
In general, the minimum mapping unit is from 1 to 3 acres.
Some small units and those obscured by dense forest cover
may not be included in this dataset.
Polygon and chain-node topology present.
Polygons intersecting the neatline are closed along the border.
Segments making up the outer and inner boundaries of a polygon
tie end-to-end to completely enclose the area. Line segments are
a set of sequentially numbered coordinate pairs. No duplicate
features exist nor duplicate points in a data string. Intersecting
lines are separated into individual line segments at the point of
intersection. Point data are represented by two sets of coordinate
pairs, each with the same coordinate values. All nodes are
represented by a single coordinate pair which indicates the beginning
or end of a line segment. The neatline was generated by
mathematically generating the four sides of the quadrangle,
densifying the lines of latitude and projecting the file to UTM
zone 11 (with a y-shift).
Are there legal restrictions on access or use of the data?
- This digital database is not meant to be used or displayed at any scale larger than 1:250,000 (e.g., 1:100,000 or 1:24,000).
Any hardcopies utilizing this data set shall clearly indicate its source. If the user has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. User specifically agrees not to misrepresent these data, nor to imply that changes they made were approved by the U.S. Geological Survey.
USGS Open-File Report 99-144
The U.S. Geological Survey (USGS) provides these geographic data "as is." The USGS makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. The USGS further makes no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers at the USGS, no warranty, expressed or implied, is made by the USGS regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty.
In no event shall the USGS have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by USGS.
This digital geologic map GIS of the Sandpoint 1:250,000 quadrangle, Washington, Idaho, and Montana is not meant to be used or displayed at any scale larger than 1:250,000 (e.g., 1:100,000 or 1:24,000).
|Data format:||Geologic unit boundaries and characteristics in format ARCE (version 7.x) Size: 14.3|