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# Coordinate Transformation SMI CVC Version 7

Hello,

I do not understand how to use my SMI software to transform coordinates. I have created a fictional job to illustrate my predicament. I have created points in my SMI card for two centerline PCPs, and four property corners. These are calculated points based on a plat. When I arrive at the job I set a nail across the street from the property, and occupy it.

Calculated Points:

Point   Northing        Easting         Description

100     5000.0000    5000.0000   PCP

101     5000.0000    4400.0000   PCP

102     5025.0000    4900.0000   PROPERTY CORNER

103     5025.0000    4840.0000   PROPERTY CORNER

104     5105.0000    4840.0000   PROPERTY CORNER

105     5105.0000    4900.0000   PROPERTY CORNER

I call the nail point number 2, and give it coordinates of 10000.0000 northing, and 10000.0000 easting. I backsight point number 101 with a backsight azimuth of 315d 00' 00". I store point number 101 as point number 1. I continue storing the remaining calculated points as side shots.

Surveyed Points:

Point   Northing          Easting             Description

1         10290.1000    9709.9000       PCP N&D

3          9881.7000     10149.3000     PCP N&D

4          9968.0300     10093.1800     1/2" IRC

5         10008.8800    10049.2500     1/2" IRC

6         10067.5100    10103.7000     1/2" IRC

7         10026.6100    10147.6000     1/2" IRC

Now I want to compare my surveyed points with my calculated points. My random point file (points to be transformed) is entered as 1.7 (range of points). In the transformation program I enter point number 101 as the old point (rotation point), and point number 1 as the new point. I enter 315d 00' 00" as my rotation angle. I get incorrect results after running the program. What am I doing wrong?

Regards,

Mark

This Content Originally Published by a land surveyor to Land Surveyors United Network

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