Inland Electronic Navigational Charts
Inland Electronic Navigational Charts
Following the pilot projects effort, development of initial IENCs to cover most of the Mississippi and Ohio Rivers began in Fiscal Year 2002. A Content Specification was drafted that defines all the features and attributes for the IENCs and maps the information to the S-57 structure.
IENCs currently available in S-57 Version 3.1 data exchange standard are:
- Allegheny River, Mile 0-7
- Arkansas River, Mile 0-444
- Atchafalaya River, Mile 0-118
- Black Warrior-Tombigbee Rivers, Mile 0-393
- Cumberland River, Mile 0-381
- Green River, Mile 1 -108
- Illinois River, Mile 0-322
- Kaskaskia, Mile 2 to 36
- Kanawha River, Mile 0-91
- Lower Mississippi River, Mile 236-951
- Missouri River, Mile 0-735
- Monongahela River, Mile 0-128
- Ohio River, Mile 0-981
- Ouachita River, Mile 5 to 338
- Red River, Mile 0-237
- Tennessee River, Mile 0-652 (Including Tellico, Hiwassee, Clinch and Emory Rivers)
- Tennessee-Tombigbee Waterway, Mile 218-450
- Upper Mississippi River, Mile 0-866
IENCs currently available in Inland ENC 2.2 Data Standard are:
- Allegheny River, Mile 0-15
- Arkansas River, Mile 0-444
- Atchafalaya River, Mile 0-118
- Black Warrior-Tombigbee Rivers, Mile 0-393
- Cumberland River, Mile 0-381
- Green River, Mile 1 -108
- Illinois River, Mile 0-322
- Kaskaskia, Mile 2 to 36
- Kanawha River, Mile 0-91
- Lower Mississippi River, Mile 236-951
- Missouri River, Mile 0-735
- Monongahela River, Mile 0-128
- Ohio River, Mile 0-981
- Ouachita River, Mile 5 to 338
- Red River, Mile 0-237
- Tennessee River, Mile 0-652 (Including Tellico, Hiwassee, Clinch and Emory Rivers)
- Tennesse-Tombigbee Waterway, Mile 218-450
- Upper Mississippi River, Mile 0-866
IENCs currently under development are:
- Alabama River
- White River
S-57, Version 3.1
Most USACE IENCs follow the IHO Transfer Standard for Digital Hydrographic Data (S-57, Version 3.1), which is recognized by software vendors and government hydrographic offices for electronic chart applications. Because S-57 is intended for deep-draft, ocean shipping, in some instances a "best fit" between river information and the S-57 structure is required.
IHO S-57/ENC - Object and Attribute Catalogue
For details on how real-world features are charted in these IENCs, please refer to the USACE IENC Encoding Code, Edition 4.0 which provides detailed guidance on what is required to produce a consistent, uniform USACE Inland ENC.
Inland ENC, 2.2 Product Specification
Newer IENCs follow the Inland ENC Product Specification, edition 2.2.
This standard, which is based on the S-57 data transfer standard, allows for features which are unique to inland waterways to be accurately encoded on the electronic charts. For example, features such as Fleeting Areas, Lock Walls, and Casino Boats, etc. which are not included in the S-57 standard (designed only for maritime use), can now be accurately charted using this standard.
For details on how real-world features are charted in these IENCs, please refer to the Inland ENC Encoding Guide, Edition 2.2.0.
Inland ENC Product Specification (including Feature Catalogue and Encoding Guide)
In both cases, the Encoding Guide provides a framework for IENC specifications by:
1. Using existing IHO S-57 Edition 3.1 standard. Specifically, the: 
[Maritime] ENC Product Specification (Appendix B1)
IHO Object Catalogue (Appendix A)
Object Catalogue (Appendix B.1, Annex A)
2. Defining the mandatory requirements for safety-of-navigation on inland waterways.
3. Recommending object classes, attributes, and attribute values for encoding IENC data.
1. Provides a basis for its creation
2. Describes its relationship to the real-world entity
3. Provides criteria for its proper use
4. Gives specific encoding examples
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