**Interagency Trail Data Standards: GIS "Task 1"**

updated 11/3/2004

**ITDS GIS Task 1: Complete Definition of ITDS for Tabular and Spatial
Implementation**

1.  Identify needed data parameters (i.e. needed or missing attribute
    variable including accuracy, alpha versus num, \# characters, etc.)

2.  Verify the ITDS attributes applicable for spatial display

3.  Define data parameters for each applicable attribute

**ITDS / GIS Task 1 Team** (T1 Team)

+-----------------+------------------+-------------------+-------------+
| > **USFS**      | **NPS**          | **BLM**           | **FWS**     |
+-----------------+------------------+-------------------+-------------+
| Jaime Schmidt   | David Duran      | Bill Gibson (ITDS | Deb Green   |
| (ITDS Team)     | (ITDS Team)      | Team)             | (FWS GIS)   |
+-----------------+------------------+-------------------+-------------+
| Ethan Bodin     | Helen Scully     | Ed Harne (BLM     |             |
| (Infra / GIS)   | (ITDS Team)      | GIS)              |             |
+-----------------+------------------+-------------------+-------------+
| Rob Aiken       | Dick Mayle (ITDS | Tom Chatfield     |             |
| (Infra / GIS)   | Team)            | (BLM GIS)         |             |
+-----------------+------------------+-------------------+-------------+
|                 | Kay Threlkeld    | Marguerite McKee  |             |
|                 | (ITDS Team)      | (BLM GIS)         |             |
+-----------------+------------------+-------------------+-------------+
|                 | Dave Best (NPS   |                   |             |
|                 | GIS)             |                   |             |
+-----------------+------------------+-------------------+-------------+
|                 | Joe Gregson (NPS |                   |             |
|                 | Nat'l Map)       |                   |             |
+-----------------+------------------+-------------------+-------------+
|                 | (Lisa            |                   |             |
|                 | Nelson\--Joe's   |                   |             |
|                 | alternate)       |                   |             |
+-----------------+------------------+-------------------+-------------+

**ITDS Data Parameters** (DRAFT 11/3/2004)

> **Generally Applicable Data Parameters**
>
> The T1 Team has identified the following data parameters that are
> generally applicable to all Interagency Trail Data Standards (version
> 1).

+----------+-----------------------------------------------------------+
| Spatial  | Best available source with a target source scale of at    |
| Data     | least 1:24k for continental U.S., Puerto Rico, and Hawaii |
| Source:  | and 1:63,360 for Alaska.                                  |
+----------+-----------------------------------------------------------+
| Ho       | Accuracy testing must use NSSDA testing guidelines or be  |
| rizontal | reported based on compiled, published test reports        |
| A        | appropriate for the data collection method and equipment. |
| ccuracy: |                                                           |
|          | The method of determining accuracy should be documented   |
|          | in the process step of the dataset metadata record. If    |
|          | published accuracy results are used, use the statement    |
|          | 'Compiled to meet \_\_\_ (meters, feet) horizontal        |
|          | accuracy at 95% confidence interval' in the metadata      |
|          | record, and identify the testing source used. If accuracy |
|          | is locally tested to NSSDA standards, the statement       |
|          | 'Tested to meet \_\_\_ (meters, feet) horizontal accuracy |
|          | at 95% confidence interval' should be added to the        |
|          | metadata record.                                          |
|          |                                                           |
|          | Accuracy for legacy data may be reported according to the |
|          | accuracy standard in place at the time of data collection |
|          | (typically National Map Accuracy Standards). Document the |
|          | standard used in the metadata record.                     |
|          |                                                           |
|          | (For more information, see:                               |
|          | <http://www.fgdc.                                         |
|          | gov/standards/documents/standards/accuracy/chapter3.pdf>) |
+----------+-----------------------------------------------------------+
| Spatial  | Agency appropriate. A complete projection description in  |
| R        | FGDC format is required including horizontal coordinate   |
| eference | system, datum, and units of measure. Include vertical     |
| Info     | coordinate system information where necessary.            |
| rmation: |                                                           |
+----------+-----------------------------------------------------------+
| Feature  | Line (route and arc topology)                             |
| Type:    |                                                           |
+----------+-----------------------------------------------------------+
| Pr       | Double precision                                          |
| ecision: |                                                           |
+----------+-----------------------------------------------------------+

> **Attribute-Specific Data Parameters**
>
> The T1 Team has identified the following variables, which next need to
> be defined for each applicable ITDS attribute. (T1 Team pending or
> review items noted in blue.)

+-----------------+----------------------------------------------------+
| > **Data        | > **Data Parameter Definition / Criteria**         |
| > Parameter**   |                                                    |
+-----------------+----------------------------------------------------+
| > **GIS Item    | > The name the attribute is called in the GIS      |
| > Name**        | > layer (10 characters or less).                   |
+-----------------+----------------------------------------------------+
| > **GIS         | > If applicable, the GIS alias or crosswalk name   |
| > Alternate     | > for the ITDS attribute (not limited to 10        |
| > Name**        | > characters).                                     |
| >               |                                                    |
| > (If           |                                                    |
| > Applicable)   |                                                    |
+-----------------+----------------------------------------------------+
| **Width**       | Field width.                                       |
+-----------------+----------------------------------------------------+
| **Type**        | Text, Integer, or Numeric (decimal).               |
|                 |                                                    |
|                 | (T1 Team: verify during review of specific         |
|                 | attributes whether Numeric is needed---is          |
|                 | consistent unit of measure needed?)                |
+-----------------+----------------------------------------------------+
| **Number of     | Number of decimal places displayed when            |
| Decimals**      | Type=Numeric.                                      |
|                 |                                                    |
|                 | (see T1 note above)                                |
+-----------------+----------------------------------------------------+
| **Null / Not    | Identification of whether a Null value or Not Null |
| Null**          | value is allowed.                                  |
+-----------------+----------------------------------------------------+
| **Unique / Not  | Identified value is not duplicated between trail   |
| Unique**        | records (WORDSMITH)                                |
+-----------------+----------------------------------------------------+

**Additional Attributes Considered**

Below is a listing of the FGDC Attributes considered, and the
corresponding ITDS disposition as identified by the T1 Team.

  ---------------- ------------------------------------------------------
  **FGDC           **Related ITDS Data Parameter or Disposition**
  Attribute**      

  **Attribute      ITDS Data Parameter: GIS Item Name
  Label**          

  **Attribute      ITDS: Attribution Definition
  Definition**     

  **Attribute      *ITDS Attributes Definitions developed by ITDS Team
  Definition       (2003-2004)*
  Source**         

  **Attribute      ITDS: List of Values
  Domain Values**  

  **Vertical       *Not included in ITDS Data Parameters at this time
  Accuracy**       because line features are not currently being modeled
                   as 3D features. May be revisited if needed in the
                   future.*
  ---------------- ------------------------------------------------------

Below is a listing of additional ESRI Profile Attributes considered, and
the corresponding ITDS disposition as identified by the T1 Team.

  ---------------- ------------------------------------------------------
  **ESRI Profile   **Related ITDS Data Parameter or Disposition**
  Attribute**      

  **Attribute      ITDS Data Parameter: GIS Alternate Name
  Alias**          

  **Attribute      ITDS Data Parameter: Type
  Type**           

  **Attribute      ITDS Data Parameter: Width
  Width**          

  **Attribute      ITDS Data Parameter: Precision
  Precision**      

  **Attribute      *Pre-defined under ITDS Spatial Data Source*
  Scale**          

  **Attribute      *Not included in ITDS since this attribute is software
  Output Width**   specific and/or reflects outdated technology*

  **Attribute      ITDS Data Parameter: Number of Decimals
  Number of        
  Decimals**       

  **Attribute      *Not included in ITDS since this attribute is
  Indexed**        software-specific*

  **Sub-Type       *Not included in ITDS since this attribute is
  Information**    software-specific*

  **Relationship   *Not included in ITDS since this is software-specific
  Class**          and does not apply to basic GIS layers*
  ---------------- ------------------------------------------------------

**BIN: Pending Items to be considered and/or resolved by T1 Team**

1.  **Standardized Use or ArcInfo?** For general ITDS implementation
    guidelines, consider adding statement about deliverable ITDS
    products (i.e. recommend most generic deliverable---standardized use
    of ArcInfo?)

2.  **BMP/EMP:** How do we cover---a separate row or column in ITDS
    table?

> (T1 Team: Agreed to wait on this & determine if this is more of an
> implementation issue)

3.  **Attribute Source (Optional):** T1 defined as "The source of the
    geographic position of the arc."

> How do we cover---a separate row or column in ITDS table?
>
> (T1 Team: Clarify---"store in English LOV's" or "leave open for free
> text"??)

4.  **Data Parameter "Type":** When defining Type ITDS attributes, keep
    in mind that ESRI has well-defined list of potential LOVs