NMBGMR Draft Geologic Data Model - v. 1.0.4
POINTS: Geologic Features

revised: 15-Nov-2013

Feature Class: Tics

This feature class represents the 16 latitude/longitude tics on a 1:24,000-scale 7.5 minute quadrangle. Tics are spaced every 2' 30" (2.5 minutes) within and around the extent of the quadrangle. The tics are useful when georeferencing raster datasets to the quadrangle.

Tics can be generated using an Excel spreadsheet by entering the coordinate for the NW corner of the quadrangle. One addtional tic may be present at the center of the map, tic = 0, that does not appear on USGS quadrangles. The coordinates for the center of the map are useful for determining the current magnetic declination for the quadrangle using NOAA's declination calculator.

Field Name Field Alias Length
(text fields)
Field Type Field Value Default Allow Nulls? Attributes / Examples Description / Notes
tic Tic_ID   Long Integer variable [null] TRUE 11, 12, 13, 14,
21, 22, 23, etc (left-to-right column/ top-to-bottom row pairs) or 0 for the location of the center of the map.
The coordinates for the center of the map are useful for determining the current magnetic declination.
long_dd Longitude_dd   Double variable [null] TRUE -106.000000000 Longitude in decimal degrees (negative for west longitude).
lat_dd Latitude_dd   Double variable [null] TRUE

35.750000000

Latitude in decimal degrees.