https://community.esri.com/t5/arcgis-drone2map-questions/calculate-areas/m-p/1183504#M1153 <P>Hello,</P><P>I have prosessed a project from own drone data and GCPs and are now trying to calculate area on the orthomosaic. I then tried to import the orthomosaic into ArcGIS and calculate the same area, but the answers are completely different. I have made sure the coordinate systems are the same and correct, and in ArcGIS I drew a polygon and used shape_area from the attribute table. Why is there a difference and which calculation is the correct one?</P> Thu, 16 Jun 2022 13:03:53 GMT HeddaJensen 2022-06-16T13:03:53Z https://community.esri.com/t5/arcgis-drone2map-questions/calculate-areas/m-p/1183504#M1153 <P>Hello,</P><P>I have prosessed a project from own drone data and GCPs and are now trying to calculate area on the orthomosaic. I then tried to import the orthomosaic into ArcGIS and calculate the same area, but the answers are completely different. I have made sure the coordinate systems are the same and correct, and in ArcGIS I drew a polygon and used shape_area from the attribute table. Why is there a difference and which calculation is the correct one?</P> Thu, 16 Jun 2022 13:03:53 GMT https://community.esri.com/t5/arcgis-drone2map-questions/calculate-areas/m-p/1183504#M1153 HeddaJensen 2022-06-16T13:03:53Z