revised: 05-Feb-2015

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

In the interests of standardization and interoperability, we are migrating our geologic maps into the USGS NCGMP09 data model. However, our well data model is still actively being used. Documentation for the NMBGMR geology data model is being provided for users with legacy data in this model. We also hope that it will provoke discussion in the ongoing effort to improve NCGMP09 and other models.

Feature Class: Data_point

This feature class records the location of samples or non-oriented point data that are not uniquely mappable (such as field collected provenance, grain-size, or permeametry measurements). These points may coincide with point data in other feature classes and will be related by StationID. This feature class is intended to represent just the location of data points and should be linked to a user-defined external data table (or the images table) that contains details on the samples. For multiple samples from a single area (e.g. paleocurrent data from a single outcrop), all data that should not be displayed on the map can have the DisplayScale set to 0 (zero).

Field Name Field Alias Length
(text fields)
Field Type Field Value Default Allow Nulls? Attributes / Examples Description / Notes
FGDC_code " 16 String variable [null] TRUE 30.3.12 FGDC geologic symbol reference number.
StationID " 50 String variable [null] TRUE ASR-99 Station ID to link to notes, photos, etc. Could be basis of many-to-one relationships with other point data for multiple measurements (non-attitude)
StatnClass StationClass 50 String CVD [null] TRUE [sample] location, [station] location, [measurement] location Main purpose of recording information
StatnType StationType 50 String variable [null] TRUE [null], unspecified, rock sample, soil sample, water sample, sketch, notes, soil pit, permeametry, clast count, joint populations, grain size measurements, provenance, photographs, etc. Type of recorded information of specified class.
SampleID " 50 String variable [null] TRUE [null], ARR-05-99 Probably will be the same as Station ID, but non-null value indicates sample was taken.
PhotoID " 50 String variable [null] TRUE [null], frame 25 linked to image table
LargerFtr LargerFeature 50 String variable [null] TRUE related faults, ash beds, marker layers, or other features Plaintext related larger features/geologic units.
LocAccType LocAccuracyType 50 String variable [null] TRUE precision gps, handheld gps, good topo, poor topo, planimetric, survey, map and compass, triangulation, distinctive feature Accuracy of position.
LocAccMeas LocAccuracyMeasure 16 String variable [null] TRUE EPE(m), PDOP Criteria for deterimining accuracy of position.
LocAccVal LocAccuracyValue   Single variable [null] TRUE 15 Numeric measurement of locataion accuracy
DsplyScale DisplayScale   Long Integer CVD 24000 TRUE see: DisplayScale Denominator of display scale: display feature at scales larger than number specified (=< denominator). Zero indicates data that should never be displayed.
SourceID " 128 String variable [null]   unknown; unspecified; Smith, 2006b [variable] Feature level metadata (who mapped this); related to bibliographic detail
Comments " 255 String variable [null] TRUE description Comments about this particular sample.