USA GY 461 - Digitizing Station Data and Building a Geological Structure Database (38 pages)

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Digitizing Station Data and Building a Geological Structure Database



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Digitizing Station Data and Building a Geological Structure Database

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Lecture Notes


Pages:
38
School:
University of South Alabama
Course:
Gy 461 - Gis Apps I-environment - C

Unformatted text preview:

GY461 Computer Mapping GIS Technology Digitizing Station Data and Building a Geological Structure Database Introduction This document describes the process of converting geological data collected in the field into a digital database that can be used with a GIS to automatically post the station and structure symbols on a digital map with correct orientation and with dip plunge values automatically labeled In this process a relational database is created that is composed of two separate but related database files A database containing attributes that occur once per station such as latitude or longitude A database containing attributes that may occur multiple times at a station point such as bedding mineral lineation etc In the following examples several types of application software are used including database and GIS software The examples are specific to the applications used however the logical steps would be the same regardless of the specific application programs To follow these examples you would need access to the following applications AutoCAD Map 3 x or higher Paradox 5 0 or higher Mappro Freeware Netprog Freeware Make sure that these applications are installed and accessible before starting the below examples When you have completed the steps outlined below you will have created a flexible database of structure data that is usable with a variety of applications including GIS With the GIS you will be able to automatically post the structure data on a digital base map or select subsets of the data to plot on a stereographic net Step 1 Setup for Digitizing Transfer all station locations to a single quadrangle preferably one that has been laminated Inspect the stations to make sure that none of the labels are repeated At this time you may also want to re copy the structure orientation data from the field notebook into a tabular format to facilitate data entry Tape the map onto the digitizer so that it is smooth and stable Step 2 Insert Station Blocks Page 1 of 38



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