Digitizing the San Marcos Cemetery Final Report Johnathan Phillips Colton Love Daniel Tittle

Background The San Marcos Cemetery commonly referred to as the city cemetery, consists of a 45-acre plot located on 1001 Ranch Road 12. Founded in 1876 as an expansion of the town’s original cemetery, The San Marcos City Cemetery has burials dating back to 1846 making this cemetery a historic site for the people of San Marcos City of San Marcos needed a spatial inventory of the San Marcos cemetery Utilize GPS and GIS

Tasks Collect GPS data for required portion of the San Marcos Cemetery Explore spatial resolution of available GPS devices Model the layout of the San Marcos Cemetery Apply the Pontem software methodology and file geodatabase architecture to collected data.

Summary of Task 1 Collect GPS data in the Ramsay Addition Complete “Learning period” decreased time available to collect Collected all of section A3 Weather conditions took time away from collecting Obstructions in A3 Ramsay Addition Boundary GPS the BEC-LIN control points

Summary of Task 2 Explore spatial resolution of available GPS devices Complete! Three units available Chose the Trimble GeoXT 2005 edition About 50cm of accuracy and about 7 satellites while in the field

Summary of Task 3 Model the layout of the San Marcos Cemetery Complete – section A3 GPS collected Section, Addition, Grave Block boundaries and Tree locations Hand created Grave polygons

BEC-LIN vs Super GPS Bros

Summary on Task 4 Apply Pontem software attribution requirements and File Geodatabase architecture Complete All data has been transferred into a file geodatabase Shapefiles are consistent with BEC-LINs schema

Changes to the Project Scope: Proposal vs Progress Report vs Reality Methodology: Initial vs Grid vs Final

Method 1 ~45mins

Method 2 ~4hours

Method 3 ~15mins

Final Methodology Collect data in aggregable weather For trees: use the distance-bearing method for collection Draw grave polygons b/c GPS device was not accurate at that size of polygon Collect in the GPS native WGS84 For grave blocks under tree cover or otherwise inaccessible: physically measure the center of the block and use the distance-bearing method to collect the center For grave blocks: collect a few really accurate and precise polygons Post process GPS data on the day of collection Reproject data into Texas South Central in ArcMap Collect one point per vertex in polygons

Conclusion We completed what we could, of the initial FRP. The methodology we developed can be easily implemented for other projects with minor tweaks Determined actual needs of GPS collected data

Lesson Learned

Lesson Learned

Questions?