MidTex Mapping Services Co.
Railroad Commission Data User's Guide to 7.5' Digital Quadrangles

Table of Contents
1. Overview

2. Drawing File Layout and Features
   2.1 Layers
   2.2 Colors
   2.3 Linetypes
   2.4 Symbols
   2.5 Well Data
   2.6 Available Coordinate Systems

3. Pricing, ordering information, and phone numbers.

4. Other Products / Services
   4.1 ADSDLG - USGS DLG map file reader for AutoCAD R12
   4.2 USGS DLG Maps pre-formatted for ACAD.
   4.3 USGS DEM (Digital Elevation Model) data.


1.  Overview

The Texas Railroad Commission some time ago began a program to make map data
available in a digital format.  The data includes an array of information
that is useful to the oil and gas industry including well locations for
flowing wells, dry holes, plugged oil and gas wells, injection wells, and
others; block and section boundaries with section numbers and abstract
information; as well as ground data such as roads, city boundaries, water
features and the like.

This is great, but it doesn't do a lot of good for the majority of normal
users because there are few packages that natively read the RRC's
proprietary vector format.  It has to be converted so that a specific
package (like AutoCAD) can read it.  That is what we have done.

The following files should have been unzipped into your directory after
installation:

		3397414.dwg	ACAD drawing file for Callisburg Quadrangle
		3397414.dxf     DXF file for Callisburg Quadrangle
		symbol.dwg	Drawing file describing what symbols mean
		symbol.dxf	DXF version of symbol.dwg
                maf000          Database file for linking well data to
                                individual wells (for GIS capable packages).
                                Tab-delimited.
		file_id.diz	Description of download.

Please feel free to distribute any of the files in this download to anyone
you want.  If you just so happen to be doing work in Callisburg Quadrangle
(in Cooke Co., TX) and would like to use this in a presentation (or any
other way for that matter) feel free to do that as well.  We want you to
feel absolutely unhindered to use this data as you feel necessary, even if
profit on your part is involved.

2.  Drawing File Layout and Features
2.1  Layers

One of the things that makes the drawing file easy to use is that the
layering scheme is formulated such that the operator can quickly determine
what type of data is in each layer.  Our scheme uses a three letter code +
underscore character to delineate classes of layers.  It also makes it easy to
perform operations on entire classes of layers.  For example, if you want to
freeze all boundary layers, the command (from the AutoCAD Command: prompt)
would be:

	layer
	f
	bnd*   (the * indicates to perform operation on
	       all layers that begin with bnd)

Below is the list of layers and what can be found on each layer:

        BND LAYERS: CONTAIN ALL BOUNDARY LINE INFORMATION
                bnd_airport             airport boundaries and annotation
                bnd_cemetery            cemetery boundaries and annotation
                bnd_countystate         county and state boundary lines
                bnd_citytown            city and town boundary lines
                bnd_governmentland      parks and military reservations +
	                                annotation
                bnd_national            national boundary lines
                bnd_offshore            offshore boundary lines
                bnd_quad                quadrangle boundary line

        HYD LAYERS: CONTAIN ALL HYDROGRAPHY INFORMATION
                hyd_creekriverlake      creeks, rivers, and lakes +
		                        annotation
                hyd_dam                 dams and annotation


        PLS LAYERS: CONTAIN ALL PUBLIC LAND SURVEY SYSTEM INFORMATION
                pls_blocksecabs         block, section, and abstract
		                        lines and annotation
                pls_centroids           contain survey centroid information
                pls_offshore            offshore survey information and
                                        annotation
                pls_subdivision         subdivision boundary and lot numbers


	TRN LAYERS: CONTAIN ALL TRANSPORTATION INFORMATION
		trn_railroad		railroad lines and annotation
		trn_roadhm		heavy to medium duty roads and annotation
		trn_roadl		light duty roads and annotation
		trn_roadui		unimproved roads and annotation
		trn_shipchannel		ship channels

	WELL LAYERS: CONTAIN ALL WELL INFORMATION
		wel_wells		all wells and annotation

(The following layers may or may not be found in any given drawing, but
represent all possible layers.)

2.2  Colors
Coloring of map features is determined by document OGA094, available from
the Texas Railroad Commission.  Below is a table that generally
describes what color you should expect to see associated with certain map
features.  (Please note that the list is a general outline; it is not
intended to be all inclusive.)


	BLACK	State, county, and national political boundaries
			State and county annotation
			Block, survey, section, and overlap survey boundaries
			Block, survey, section, and overlap annotation
			Dam structures
			Unimproved and light duty roads
			Railroads, ship channels, and some highways
			All wells and most symbols
			Directional drill lines

	BLUE 	All information that is offshore (except three league line)
			Rivers, canals, lakes, and creeks
			Original course of creek under a now existing lake

	RED	City boundaries
			Offshore - three league line
			City, town, and major city boundary annotation
			Heavy/medium duty roads
			Highway annotation
			State highway 3 and 4 digit symbols
			Interstate highway symbols
			Radioactive symbol

	GREEN	Parks and Military Reservations
			Government land annotation
			Cemetery annotation, boundaries, and symbols
			Airport runways and annotation

	YELLOW	All subdivision lines and annotation

	PURPLE	Quadrangle borders
	(MAGENTA)

2.3  Linetypes

Every effort has been made to adhere closely to what the RRC intended the
linetypes to look like, even though most of these linetypes are not directly
supported by ACAD itself.  Because of this, certain lines (roads on
trn_roadhm for example) are not continuous lines to ACAD; they are made up of
multiple (individual) line segments.

2.4 Symbols

Please take a moment to look at the file symbol.dwg (or symbol.dxf).  It is a
table that describes what the symbols in the drawing look like and what they
symbolize.

2.5  Well Data

Two levels of well information exist from the RRC.  The first is  simply well
locations, symbols and API numbers, which come with the regular digital map
file.  The second level includes information such as lease name, operator
name, total depth, block, survey, section information, as well as other
information.  The example map shows the basic map, with API numbers plotted
beside each well.  It also includes the file MAF000, which is produced by us.
It includes information from the API database (noted above) along with
position information.  It is formatted so that it can be used in a spreadsheet
application. It can be read into most spreadsheet packages that will read
ASCII TAB-delimited spreadsheet files.  The fields in the spreadsheet are as
follows:  State Plane X value State Plane Y value Symbol name (see symbol.dwg
or symbol.dxf for symbols)

		Quad number
		API number
		Survey Block
		Section
		Abstract
		Operator
		Total Depth
		Well ID
		Lease Name
		Permit number
		Field Name
		Completion Date
		Plug Date
		Refer to API
		On or off of schedule
		Oil/Gas Code

2.6  Available Coordinate Systems

We can accommodate all coordinate systems and projections that are commonly
used.  This includes the NAD 1927 and NAD 1983 earth models; units in meters,
feet, or international feet; and state plane or UTM coordinate systems.  The
map in your possession is NAD 1927, Texas North Central State Plane Zone (TX
4202), U.S. feet.

3. Pricing, ordering information, and phone numbers
Cost depends on the area that you are working in as well as how much you
purchase.  If you purchase 4 quadrangles, without API (extended well) data, it
is normally about $65.00/quad.  Call for quotes on entire counties.  You can
save a money in the long run by purchasing entire counties.  For example,
Brisoe Co. is $629.00 for all 20 quads ($31.45/quad), Leon Co. is $774.00 for
all 30 quads ($25.80/quad), and Schleicher Co. is $812.00 for all 32 quads
($25.38/quad).  When you consider that most people spend $7.00 per paper map,
and then have to digitize it themselves, you can really save a lot of money by
using digital maps from MidTex Mapping Services Co.

	Internet e-mail address:
		scottman@onramp.net

	USPS address:
		Scott D. Maness (Owner)
		MidTex Mapping Services Co.
		413 Cedar St., Suite 7
		Cedar Hill, TX  75104
		(214) 291-6672

	www homepage:
		http://rampages.onramp.net/~scottman/

4. Other Products / Services
4.1  ADSDLG - USGS DLG map file reader for AutoCAD R12 ($129.00)

For those who have always wanted to be able to read USGS DLG files directly
into AutoCAD, this is the solution.  ADSDLG is a C++ ADS program that extends
the functionality of AutoCAD by adding a command that allows anyone to easily
import DLG data into a blank drawing or on top of other data.  Not only will
it import raw DLG files, it will also perform the coordinate conversion as it
pulls in the data, making it easy to use for just about anyone.

4.2  USGS DLG Files Pre-Formatted for AutoCAD

If you do not have the time to surf the Internet to find the DLG's that you
are looking for, download and unzip them, and pull them into AutoCAD, then it
may be easier (and more cost effective) to purchase pre-formatted DLGs
from MidTex Mapping Services.  Cost is $35.00 per quadrangle.

4.3 USGS DEM (Digital Elevation Model) data

MidTex Mapping Services is your source for USGS 7.5' (30-meter) Digital
Elevation Model data.

Pricing is as follows:
	Quantity		Cost per file
	1			$50.00
	2-5			$27.00
	6-10			$21.00
	11-15			$17.00
	16+			$15.00

