Arc/Info Import/Export files in the form of a E00 (Data Interchange File) file are supported by the GDB library for read or write operations. The three levels of file compression are supported for reading (NONE, PARTIAL and FULL) and new E00 files are always generated with no compression.
When reading, various layers are available depending on what is found in the E00 file (at most one of each type):
Most Arc/Info projections are supported.
Both single and double precision E00 files are supported. The default for creating new E00 files is double precision. This default can be overwritten by using the options string "SINGLEONLY" to create single precision E00 files.
INFO tables are also made visible in separate layers. Any table that is not linked to one of the layer types above will appear as a secondary table in a separate layer.
If clean topology is present in the file, then the topological layers will contain some special MetaData members.
Export of Arc/Info Import/Export files is supported. These files are exported with a type of "AII".
When writing, GDB defaults to create non-topological E00 files, but applications that support GDB Topology can create E00 files that contain clean Arc/Info topological coverages.
Applications that support topology can provide a set of topological layers with clean topology and this will result in a E00 file with complete topology. If the set of layers contained an area layer, then a CNT and a LAB section will automatically be generated to accommodate the Arc/Info topology requirements. GDB also recomputes the values for the arc's LENGTH attribute and the polygon's AREA and PERIMETER attributes.
A GRD section is not supported for export.
© PCI Geomatics Enterprises, Inc.®, 2023. All rights reserved.