Independent Quality Assurance and Quality Control (QA/QC)
CompassData provides objective review of any orthorectification project to ensure your final product is at optimal accuracy.
Because CompassData owns more Ground Control Points (GCPs) than any other commercial outlet in the world, we have a unique master database to help facilitate our independent QA/QC.
QA/QC for GIS Data
Quality Assurance: comparing the schema/data structure and properties of the review dataset with a master database. We verify organization, naming conventions, identify attribute relationships, sub-types, domains, topologies and networks.
Quality Control: compare the feature counts between the source dataset and the review data, look for missing attribute values, confirm that fields containing unique values don't have duplicate values, check for badly formed geometry, and search and and evaluate tiny polygons and sliver polygons.
CompassData conducts precision checks throughout the post-processing stage.
QA/QC for LiDAR
Quantitative for vertical accuracy, horizontal accuracy, clustering of points and nominal posting
Qualitative for the elevation surface (look and feel) and removal of anomalies or temporary features such as vehicles; intersecting building corners; assessing completeness; etc.
- FEMA PM61 Compliant (FEMA Procedure Memorandum No. 61: "Standarads for LiDAR and Other High Quality Digital Topography" published Sept. 27, 2010)
- USGS V13 Compliant (United States Geological Survey (USGS) LiDAR Guidelines and Base Specifications Version 13)
- National Standards for Spatial Data Accuracy (NSSDA) compliant
