Contouring as a Data QA/QC Tool

Presented by:
Amy Crowell - Mesquite Groundwater Conservation District (GCD)

Transcript

1. Texas GIS Forum October 22, 2014 Amy Crowell Mesquite Groundwater Conservation District Ray Brady RMBJGeo
2. – ™ Access ™ Excel ™ ArcGIS ™ Surfer Programs
3. – ™ Sorting in Access or Excel and checking highs and lows. ™ Displaying in ArcView and using graduated symbols ™ Contouring Data Checks
4. – ™ Isopleths, or contour lines, connect points of equal value. –  Topographic maps show equal elevation (Z) values. –  Weather maps show equal pressure values. ™ Generally used to analyze and display data. Contouring 101
5. – Topographic Map
6. – IRS Decline Map
7. – IRS Decline Map With Error
8. – “Great discoveries are made accidentally less often than the populace likes to think.” (Commenting on how an accident led to the discovery of X-rays) ― William Cecil Dampier, A Shorter History of Science
9. –
10. –
11. –
12. –
13. –
14. – ™  Any numeric attribute in a dataset with coordinates can be contoured whether or not it’s a Z value. –  Z data ™  Well Depth ™  Depth to Water –  Location based ™  State Well Number –  Numeric data ™  Casing Size ™  Aquifer ID ™  Agency ID ™  Section Numbers Know Your Data
15. – Latitude
16. – River Basin
17. – Casing Size
18. – 3D Casing Size
19. – ™ Rearrange your thinking. –  Instead of contouring for a product, contour to check your data. ™ Rearrange your work order. –  Contour first to check data, rather than at the end for a product. Changes
20. – Questions?