We have self developed application based on ArcGIS 9.3.1 SP2. Our agents use that application to edit parcels. The parcel layer has a field SHAPE_AREA
that is calculated by ArcGIS. Our application gets the value of the field property to show the area of the parcel. However we see now that the area is not always correct. The most flagrant difference we encountered was an area of 17ca (m²) instead of 29ca. I try to find out why the values are not correct and how many of those values are incorrect. To do that I open the shapefile
in ArcGIS 10.2.1. and I add a field named "area2" with the same properties as the field SHAPE_AREA
(type: double, number format: numeric, precision: 11, scale:4), I use Calculate Geometry
to get the area and i use the same projection. Then I add a field named "result" with the same properties. I calculate the field: SHAPE_AREA - area2 to get the differences.
Can anybody tell me why I get different results when both calculations are done by ArcGIS on fields with the same properties? And how we can resolve this problem?
field "SHAPE_AREA" that is calculated by ArcGIS
but you do not tell us how that happens other than that you are using a "self developped application based on ArcGIS 9.3.1 SP2". Would you be able to edit your question to describe how you eliminated what happens in that application from suspicion of being the cause, please?