Columns

# State Plane Coordinates vs. Surface Coordinates, Part 7.

July 7, 2000
 Email / Print / Reprints / / Text Size+
In this column I'm going to show how to start a traverse using state plane coordinates. Before that, let's go online to the home page of the U.S. National Geodetic Survey (NGS) and locate a software program that converts geodetic coordinates to state plane coordinates. I'm doing it this way because most readers of this column have access to the Internet at home. I'm not going to show all web pages leading to the software, just the pertinent parts that get us to the conversion software.

This will bring you to a page headlined Current directory is /pub/pcsoft/spcs83. Scroll down through the warnings until you find these three files: spcs83.doc, spcs83.exe and spcs83.for. Download these files by clicking on them.

 Station Name Latitude (North) Longitude (West) Bromilow 32 16 52.33969 106 45 15.77636 ReillyÂ 32 16 55.93458 106 45 15.16429 Wakeman 32 17 00.10142 106 45 29.49809

Figure 2. Sketch of Sample Problem

Figure 2 is a sketch of the sample problem. There are three stations, all established using GPS. NAD 83 geodetic coordinates for each station are given in the figure. We will use SPCS83 to calculate the state plane coordinates for each station.

1. SPCS83 is a DOS program; the executable file is SPCS83.EXE. Type spcs83 and hit the enter button.

2. You will see the following:
Â Â Â  *** PROGRAM SPCS83 *****
Â Â Â  VERSION NUMBER 2
Â Â Â  LAST UPDATE 06/27/88
DO YOU WANT TO COMPUTE:
GEODETIC POSITIONS TO STATE PLANE COORDINATES STATE PLANE COORDINATES TO GEODETIC POSITIONS PRINT THE OUTPUT FILE ON THE PRINTER TYPE NUMBER

3. Type 1, hit the enter button.

4. The following line will appear:
DO YOU WANT TO RUN INTERACTIVELY (Y/N)?

5. Type Y, hit the enter button.

6. The following line will appear:
DO YOU WANT THE OUTPUT SAVED IN A FILE (Y/N)?

7. Type Y, hit the enter button.

8. Give a name to the output file. It should be no more than eight characters. Then hit the enter button.

9. Follow the instructions on the screen for entering latitude and longitude. When asked for direction of longitude, enter W, for west longitude.

10. The last question asked is
ENTER ZONE CODES, AS MANY AS THREE

 STATION NAME LATITUDE (NORTH) LONGITUDE (WEST) NORTHING (Y) METER EASTING (X) METER ZONE CONVERGENCE SCALE FACTOR ELEV (M) GEOID HT (M) D M S Bromilow 32 16 52.33969 106 45 15.77636 142158.262 452489.852 NM C -0 16 9.78 0.99992783 1 1 Reilly 32 16 55.93458 106 45 15.16429 142268.912 452506.387 NM C -0 16 9.48 0.99992781 1 1 Wakeman 32 17 0.10142 106 45 29.49809 142399.023 452131.948 NM C -0 16 17.17 0.99992825 1 1

Figure 3. State Plane Zones
Figure 3 shows zone codes for each zone of every state. In our example, the zone is New Mexico Central, zone 3002. (We only have one zone in our sample problem.)

1. Repeat this procedure for every station. At the end, print the output file. For our sample problem, the output file is shown in Figure 4.

We are now ready to traverse on the state plane grid. Looking at Figure 4, we input the latitude and longitude, on the 1983 datum, for stations Bromilow, Reilly and Wakeman. The output for each station are the northing, easting, convergence and scale factor. (We haven’t discussed convergence, that will be in the next, and last column, of this series.) This is what we are looking for: Inversing between each pair of coordinates gives the grid distances. Taking the coordinate differences leads to the grid azimuth. From the differences in grid azimuths we get horizontal angles. We will do all these calculations, and more, in the next column.

## Image Galleries

### HxGN Live

More than 3,500 attendees from more than 70 countries attended HxGN Live, the annual Hexagon AB user conference, at the MGM Grand Hotel & Casino in Las Vegas on June 3-6. About 450 keynotes and panel discussions were held, and several companies from around the world exhibited their geospatial products. Here are a few snapshots from the event.

## 2015 May

In this May 2015 issue of POB, we take a look at the keynote on technology in the information age given by Andy Lowery, DAQRI CEO, at this year's SPAR International.

Surveyors, with the weather finally starting to improve everywhere, are you thinking about the long days to come? This summer, you are going to …
View Results Poll Archive

### Point of Beginning Store

Colonial

The perfect gift or award for any special occasion.

More Products

### Clear Seas Research

With access to over one million professionals and more than 60 industry-specific publications, Clear Seas Research offers relevant insights from those who know your industry best. Let us customize a market research solution that exceeds your marketing goals.

### Geo Locator

The #1 buyers' guide for land surveyors and geomatics professionals. Search listings for software and equipment manufacturers, equipment dealers and professional services. CLICK HERE to view GeoLocator.