Values are rounded in coverage attribute table

Last Published: April 25, 2020


Using ArcView's Import71 Utility to bring a Workstation ArcInfo coverage into ArcView, the numeric values attribute tables are all rounded.


The items were created in ArcInfo as N-type fields. ArcInfo's EXPORT and
IMPORT commands, including Import71, will round the values in N-type fields to
eight significant digits.

The field types for ArcInfo items are the following.

B - Whole numbers stored as binary integers (width of 2 or 4 bytes only). The maximum value for width of 2 is 32,767; for width of 4 is 2,147,483,647.

C - Characters (width up to 320 alphanumeric characters).

D - Dates in the form DD/MM/YY or DD/MM/YYYY (item width is fixed at 8 and
stored internally as YYYYMMDD).

F - Decimal numbers stored in internal floating-point representation (width of
4 or 8 bytes only). A 4-byte width is single-precision real (7 digits of
precision), and 8 bytes is double-precision (14 digits of precision).

I - Integers stored as 1 byte per digit (width from 1 to 16,maximum value
possible is 2,147,483,647).

N - Decimal numbers stored as 1 byte per digit (width from 1 to 16).

Solution or Workaround

  1. Create new items as F-type fields in ArcInfo.
  2. Copy the values from the N-type fields to the F-type fields.
  3. Re-export the coverage from ArcInfo.
  4. Import the coverage into ArcView by using the Import71 utility.

Article ID:000004072

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