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Williamson Sketch Validation


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Williamson Sketch Validation

  1. 1. Now that the imagery is available what elsecan you do with it???<br />Answer: Sketch Validation<br />Sketch vectors exported from CAMA system<br />Geo-referenced, rotated, and anchored to the structure on the aerial ortho image.<br />GIS sketch layer created<br />Invalid findings greater than 100 square feet identified<br />Using this process ALL sketches of improvements are validated and can be considered as digitally re-measured<br />Appraisers work with the validation software to correct any invalid sketches from a queue.<br />Increases accuracy of sketches and adds missing value to the appraisal role.<br />Sketch Validation<br />
  2. 2. Upon completion of the project, the vectors are delivered in a GIS shapefile format. <br />
  3. 3. Why Do Sketch Validation?<br />Manual re-measure estimated cost*:<br /> WCAD Improved Properties (2009) = 135,000<br />(x) Re-measured per hour = 6<br />Hours to Re-measure = 22,351 = 10.75 years<br />(x) Avg. Appraiser Salary = $60,000<br /> Estimated Cost of Manual Re-Measure =<br />$644,740<br />Gained taxable value needed to recover $644,740 = $28,655,120<br /> * This estimate is only Appraiser Cost (No Entry)<br />
  4. 4. Sketch Validation Software & Service Cost:<br /> WCAD Improved Properties (2009) = 135,000<br />(x) Sketch Validation Cost Per Parcel = $0.43<br /> Estimated Sketch Validation Cost =<br />$58,050<br />Gained taxable value needed to recover $58,050 = $2,580,000<br />Why Do Sketch Validation?<br />
  5. 5. Estimated Cost of Manual Re-Measure =<br />$644,740<br />Estimated Sketch Validation Cost =<br />$58,050<br />Why Do Sketch Validation?<br />
  6. 6. Sketch Validation Results:<br />11% invalid findings<br />Total value added to role: $88,530,128<br />Estimated Total Taxes in Year 1: $2,213,253<br />Return on Investment for Year 1<br /> Taxes Gained = $2,213,253<br /> Total Cost to District = $135,620<br />ROI = 1632%<br />Why Do Sketch Validation?<br />
  7. 7. Accuracy of the appraisal role with fairness and equality of valuations<br />Added value to role that increases tax base by adding missing improvements<br />Cost effective when compared to manual re-measure<br />Huge Return on Investment of monies contributed to your budget by the taxing units<br />Increased credibility<br />Why Do Sketch Validation?<br />
  8. 8. Sketch Validation:<br />Uses sketch vectors currently in your CAMA system<br />Overlays sketches on most recent aerial photography<br />Enables correction of invalid sketches efficiently<br />Resulting in accurate sketches<br />Change Detection:<br />Compares the most recent aerial photograph of an improvement to a previous aerial photograph<br />Changes are detected from these photographs<br />Does NOT correct existing sketch errors<br />Does correct missing improvements since last aerial photograph<br />Sketch Validation Vs. Change Detection<br />
  9. 9. <ul><li>Convert to GIS software most commonly used by your Taxing Units
  10. 10. Promotes data sharing
  11. 11. Purchase aerial ortho and oblique imagery
  12. 12. Increased visibility of improvements
  13. 13. Shared use and expense with taxing units
  14. 14. Geo-Reference (Rectify) your parcels
  15. 15. Enables immediate use of your parcel layer
  16. 16. Creates a more professional image to your taxing units and the public (increased credibility)</li></ul>Recommended Progression to Assist Taxing Units<br />
  17. 17. Sketch Validation of Improvements<br />Creates an accurate sketch of all improvements within CAMA system<br />Change Detection of Improvements<br />Continues accuracy of sketches by detecting changes from each version of your aerial photography<br />Recommended Progression to Assist Taxing Units<br />
  18. 18. Questions?<br />
  19. 19. Thank You!<br />Alvin LankfordChief Appraiser<br /><br />Pamela OrrDirector of Operations<br /><br />Williamson Central Appraisal District625 FM 1460Georgetown, Texas78626-8050(512) 930-3787<br />