- (a) Relative dimension accuracy refers to the accuracy of the digital representation of the parcel boundary on the ortho-imagery, in comparison with the legal description from the recorded deed or plat.
- (b) The relative accuracy is checked by measuring the difference in the calculated acreage versus the acreage recorded from the deed or plat that is stored in the Computer Assisted Mass Appraisal (CAMA) system.
(c)
- (1) As compared to the parcel acreage recorded in the CAMA system, it is strongly recommended that the calculated acreage for each parcel polygon be within acceptable suggested tolerances as defined in Table 1.
- (2) However, due to inherent variability in the various types of cadastral records, e.g. CAMA records, deeds, plats, etc., strict adherence to these tolerances may not be practical. Table 1: Acreage tolerances
| Acreage Range Value in CAMA | Percentage of Error Allowed in GIS Calculated Acreage |
| 5.00 – 8.00 | 15%+/- |
| 8.01 – 10.00 | 10%+/- |
| 10.01 – 20.00 | 8%+/- |
| 20.01 – 30.00 | 6%+/- |
| 30.01 – 40.00 | 5%+/- |
| 40.01 and greater | 4%+/- |