Data sets that are to be integrated should be compatible and comparable.
Description of processing steps for converting an observation into a derived data product.
The steps followed to create data should be thoroughly and accurately documented to allow others to evaluate and interpret your results.
Use statistical and visual methods for determining potentially erroneous data points
In a data file, when actual measurements could not be obtained, estimated values should be identified.
Recommendation and example of data storage and appropriate precision
Understand the geospatial parameters (resolution, reprojection, datum, scale) of spatially-referenced data when integrating geospatial datasets from multiple sources.