The document discusses sketch validation, which is a process to verify and correct sketches of property improvements in a CAMA system using aerial imagery. Key points: - Sketch validation overlays sketches on recent aerial photos to identify invalid sketches over 100 sq ft for correction. This increases accuracy and adds any missing improvements. - Manual remeasurement would take over 10 years and cost $644,740 while sketch validation costs $58,050 and recovers the cost by adding $2.58 million in taxable value. - Sketch validation found 11% of sketches were invalid and added $88.53 million in taxable value, generating $2.21 million in new taxes in the first year for a return

1. Now that the imagery is available what elsecan you do with it???Answer: Sketch ValidationSketch vectors exported from CAMA systemGeo-referenced, rotated, and anchored to the structure on the aerial ortho image.GIS sketch layer createdInvalid findings greater than 100 square feet identifiedUsing this process ALL sketches of improvements are validated and can be considered as digitally re-measuredAppraisers work with the validation software to correct any invalid sketches from a queue.Increases accuracy of sketches and adds missing value to the appraisal role.Sketch Validation

2. Upon completion of the project, the vectors are delivered in a GIS shapefile format.

3. Why Do Sketch Validation?Manual re-measure estimated cost*: WCAD Improved Properties (2009) = 135,000(x) Re-measured per hour = 6Hours to Re-measure = 22,351 = 10.75 years(x) Avg. Appraiser Salary = $60,000 Estimated Cost of Manual Re-Measure =$644,740Gained taxable value needed to recover $644,740 = $28,655,120 * This estimate is only Appraiser Cost (No Entry)

4. Sketch Validation Software & Service Cost: WCAD Improved Properties (2009) = 135,000(x) Sketch Validation Cost Per Parcel = $0.43 Estimated Sketch Validation Cost =$58,050Gained taxable value needed to recover $58,050 = $2,580,000

5. Estimated Cost of Manual Re-Measure =$644,740Estimated Sketch Validation Cost =$58,050

6. Sketch Validation Results:11% invalid findingsTotal value added to role: $88,530,128Estimated Total Taxes in Year 1: $2,213,253Return on Investment for Year 1 Taxes Gained = $2,213,253 Total Cost to District = $135,620ROI = 1632%

7. Accuracy of the appraisal role with fairness and equality of valuationsAdded value to role that increases tax base by adding missing improvementsCost effective when compared to manual re-measureHuge Return on Investment of monies contributed to your budget by the taxing unitsIncreased credibility

8. Sketch Validation:Uses sketch vectors currently in your CAMA systemOverlays sketches on most recent aerial photographyEnables correction of invalid sketches efficientlyResulting in accurate sketchesChange Detection:Compares the most recent aerial photograph of an improvement to a previous aerial photographChanges are detected from these photographsDoes NOT correct existing sketch errorsDoes correct missing improvements since last aerial photographSketch Validation Vs. Change Detection

9. Convert to GIS software most commonly used by your Taxing Units

10. Promotes data sharing

11. Purchase aerial ortho and oblique imagery