In performing a topographic survey we often locate structures such as sewer manholes. Typically the top of the manhole is located by survey and the distance from the rim to the invert of the structure is measured. This information is in the form of a manual note or added to the description of the point. For example a PNEZD (comma delimited) format would look like this: 1,100,100,100,SSMH,5.82 This would be point number 1 with a northing, easting and elevation of 100. The description of the point is SSMH and the following number, 5.82, would be the measurement from the point where the shot was taken to the invert.
This data is then read by the CADD operator and text is added reflecting the invert calculated by subtracting the manual measurement from the elevation of the located point. I reached a dead end on utilizing the Expression in the label style because the User Defined Properties that I created to store the manual measurement could not be used in an Expression. Has anyone found a way to extract the measurement from the description and automatically create the invert elevation? Thank you.