Volumetric Analysis in ArcGIS Pro

 Volumetric Analysis

Kendrick Wittmer

Date: 3/12/2025

    This project explores the use of raster analysis tools in ArcGIS Pro to analyze elevation data collected by UAS at an active mine site near Wolf Creek, Wisconsin. The focus of this lab was on performing real-world raster data processing techniques and volumetric analysis to measure changes in aggregate piles over time. The final deliverable was a calculated estimate of total material volume at a specific point in the mining operation.

Background and Objective

    The mine owner raised concerns about potential overcharging for dredged material. UAS flights were conducted on several dates in 2017 to monitor site changes. By focusing on the pile visible in the August 27 dataset, volumetric analysis was used to determine the quantity of aggregate present. The final map displays this volume visually along with key cartographic elements.

Data Preparation and Processing Steps

• Data Management: Three DSM (Digital Surface Model) datasets from July 4, July 22, and August 27 were reviewed. Each was inspected for resolution, projection, and elevation range.

• Extract by Mask: A polygon feature delineating the dredge pile was used to clip the rasters, reducing the study area to just the relevant stockpile.

• Resampling: To streamline processing, rasters were resampled to a 50 cm cell size using bilinear interpolation—ideal for continuous elevation data.

• Fill Tool: The filled surface rasters for July 22 and August 27 reduced elevation noise and improved accuracy for slope and volume analysis.

• Volumetric Calculation: The volume of the aggregate pile was computed from the surface model using the “Surface Volume” tool in ArcGIS Pro. This tool calculates the total above-ground volume within a defined area by comparing cell elevations to a base height

Final Map Layout

Reflection

    This lab emphasized how high-resolution UAS data, when properly processed, can yield precise volumetric measurements. Techniques like masking, resampling, and filling were essential to eliminate noise and ensure accuracy. Volumetric analysis like this is critical in mining, construction, and environmental monitoring, where physical material change must be measured and verified.