Letter of Map Change (LOMC)

Metadata also available as - [Outline]

Frequently anticipated questions:

What does this data set describe?

Title: Letter of Map Change (LOMC)
LOMC includes Letter of Map Amendment (LOMA), Letter of Map Revision (LOMR) and Letter of Map Revision based on Fill (LOMR-F).
  1. How should this data set be cited?

    County, King, 20160718, Letter of Map Change (LOMC): King County, King County, WA.

    Online Links:

    Other_Citation_Details: None

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -122.541245
    East_Bounding_Coordinate: -121.352128
    North_Bounding_Coordinate: 47.782898
    South_Bounding_Coordinate: 47.149896

  3. What does it look like?

    <http://www5.kingcounty.gov/sdc/DataImages/riverslomc.jpg> (JPG)
    JPG File of layer overlain on base of WA counties or local cities

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: 17-Mar-2017
    Currentness_Reference: publication date

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • GT-polygon composed of chains (0)

    2. What coordinate system is used to represent geographic features?

      The map projection used is NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet.

      Projection parameters:
      Standard_Parallel: 47.5
      Standard_Parallel: 48.73333333333333
      Longitude_of_Central_Meridian: -120.8333333333333
      Latitude_of_Projection_Origin: 47.0
      False_Easting: 1640416.666666667
      False_Northing: 0.0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.0005
      Ordinates (y-coordinates) are specified to the nearest 0.0005
      Planar coordinates are specified in foot_us

      The horizontal datum used is D North American 1983 HARN.
      The ellipsoid used is GRS 1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.

  7. How does the data set describe geographic features?

    Letter of Map Change
    area data table (Source: King County)

    Internal feature number. (Source: Esri)

    Sequential unique whole numbers that are automatically generated.

    Unique parcel number (Source: King County)

    Unique case number assigned by FEMA for the LOMA or LOMR (Source: King County)

    The determination date by FEMA (Source: King County)


    The type of LOMC - LOMA (Letter of Map Ammendment) or LOMR (Letter of Map Revision) (Source: King County)


    Type of LOMC removal by FEMA (Source: King County)

    Out as shown: Property 
    Out as shown: Structure 
    Portion of property 

    The pdf file name with the letter details by FEMA (Source: King County)

    Unique ID from the RiversFacilityInventory (RFI)database managed by Rivers section (Source: King County)

    Range of values

    Feature geometry. (Source: Esri)

    Coordinates defining the features.

    Letter of Map Change ID from the Rivers Facility Inventory database (Source: King County)



    Entity_and_Attribute_Overview: Letter of Map Change (LOMC)
    Entity_and_Attribute_Detail_Citation: King County

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    King County King County Dept of Natural Resources and Parks, Water and Lands Resource Division
    Attn: Harkeerat Kang
    GIS Analyst
    201 S Jackson St, Suite 706
    Seattle, WA 98104

    206-477-4414 (voice)

Why was the data set created?

Letter of Map Change (LOMC) is a general term used by FEMA that relates to floodplain management where several revisions and amendments are made to FEMA maps by letter.

How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

    (process 1 of 1)
    Updated as needed by Ken Zweig in the RFI database and then a script updates the feature class based on parcel layer and RFI entries.

  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

  2. How accurate are the geographic locations?

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

  5. How consistent are the relationships among the observations, including topology?

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access Constraint: Data is available on GIS Data Portal: <http://www5.kingcounty.gov/gisdataportal/Default.aspx>
Use Constraint: King County data are made available with the understanding that they shall be used exclusively by the obtainer or his/her authorized agents. Digital products may not be reproduced or redistributed in any form or by any means without the express written authorization of King County.

  1. Who distributes the data set? (Distributor 1 of 1)

    KCGIS Center
    Attn: Cheryl Wilder
    Data Sales Coordinator
    201 S Jackson St, Suite 706
    Seattle, WA 98104

    206-477-4421 (voice)

  2. What's the catalog number I need to order this data set?


  3. What legal disclaimers am I supposed to read?

    Distribution Liability: King County disclaims any warranty of use of any digital product or data beyond that for which it was designed.

  4. How can I download or order the data?

Who wrote the metadata?

Last modified: 11-Feb-2021
Metadata author:
King County King County Dept of Natural Resources and Parks, Water and Lands Resource Division
Attn: Harkeerat Kang
GIS Analyst
201 S Jackson St, Suite 706
Seattle, WA 98104

206-477-4414 (voice)

Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

Generated by mp version 2.9.12 on Sat Feb 13 19:45:54 2021