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FEMA Q3 Floodways

This page last updated: 2008-06-06 09:04:34.0
Metadata created using Minnesota Geographic Metadata Guidelines


Metadata Summary

Originator Federal Emergency Management Agency (FEMA)
Abstract The Q3 Flood Data are derived from the Flood Insurance Rate Maps (FIRMs) published by the Federal Emergency Management Agency (FEMA). The file is georeferenced to the earth's surface using the Universal Transverse Mercator (UTM) projection and a zonal coordinate system (units in meters). Specifications for the horizontal control of Q3 Flood Data files are consistent with those required for mapping at a scale of 1:24000.
Use Tips The FEMA Floodways data exists only in developed areas. Do not expect this data to be a comprehensive source of flood information. The data are generally consistent with other sources of DNR GIS data (including DEMs, lakes, streams), but no detailed analysis of consistency has been performed.
Browse Graphic View a sample of the data.
Time Period of Content Date unknown
Currentness Reference The dates of the individual county data had not been established at the time that this report was written.
Access Constraints None
Use Constraints None. Acknowledgment of FEMA would be appreciated in products derived from these data. No warranty expressed or implied is made by FEMA regarding the utility of the data on any other system nor shall the act of distribution constitute any such warranty. Internal DNR use is unrestricted. External use is constrained by the standard, general DNR GIS Data License Agreement
Distributor Organization DNR-MIS
Ordering Instructions See Online Linkage or Distribution Contact
Online Linkage http://deli.dnr.state.mn.us/


Full Metadata
FEMA Q3 Floodways

Go to Section:
1. Identification Information
2. Data Quality Information
3. Spatial Data Organization Information
4. Spatial Reference Information
5. Entity and Attribute Information
6. Distribution Information
7. Metadata Reference Information

 
Section 1 Identification Information   Top of page
Originator Federal Emergency Management Agency (FEMA)
Title FEMA Q3 Floodways
Abstract The Q3 Flood Data are derived from the Flood Insurance Rate Maps (FIRMs) published by the Federal Emergency Management Agency (FEMA). The file is georeferenced to the earth's surface using the Universal Transverse Mercator (UTM) projection and a zonal coordinate system (units in meters). Specifications for the horizontal control of Q3 Flood Data files are consistent with those required for mapping at a scale of 1:24000.
Use Tips The FEMA Floodways data exists only in developed areas. Do not expect this data to be a comprehensive source of flood information. The data are generally consistent with other sources of DNR GIS data (including DEMs, lakes, streams), but no detailed analysis of consistency has been performed.
Purpose The FIRM is the basis for floodplain management, mitigation, and insurance activities for the National Flood Insurance Program (NFIP). Insurance applications include enforcement of the mandatory purchase requirement of the Flood Disaster Protection Act which "... requires the purchase of flood insurance by property owners who are being assisted by Federal programs or by Federally supervised, regulated or insured agencies or institutions in the acquisition or improvement of land facilities located or to be located in identified areas having special flood hazards" (Section 2 (b) (4) of the 1973 Flood Disaster Protection Act). In addition to the identification of Special Flood Hazard Areas (SFHAs), the risk zones shown on the FIRMs are the basis for the establishment of premium rates for flood insurance coverage offered through the NFIP. Q3 Flood Data files are intended to convey certain key features from the existing hard copy FIRM to provide users with automated flood risk data. Edge-matching errors, overlaps and deficiencies in coverage, and similar problems are not corrected during digitizing or post-processing. These data may be used to locate SFHAs. More detailed information may be obtained from the paper FIRM.
Time Period of Content Date unknown
Currentness Reference The dates of the individual county data had not been established at the time that this report was written.
Progress In Progress
Maintenance and Update Frequency None Planned
Spatial Extent of Data Most of the state, with gaps in extreme Northeastern, East-Central and southernmost Minnesota. A total of 60 counties are available
Bounding Coordinates -97.5
-89
49.5
43
Place Keywords Minnesota
Theme Keywords Floodplain, Floodway, Flood, Hydrography, inlandWaters
Theme Keyword Thesaurus None
Access Constraints None
Use Constraints None. Acknowledgment of FEMA would be appreciated in products derived from these data. No warranty expressed or implied is made by FEMA regarding the utility of the data on any other system nor shall the act of distribution constitute any such warranty. Internal DNR use is unrestricted. External use is constrained by the standard, general DNR GIS Data License Agreement
Contact Person Information Glenn Radde, Wetlands GIS Manager
DNR-Waters
500 Lafayette Road Central Office - Box 32
St. Paul, MN 55155
Phone: 651-259-5690
FAX: (651) 296-0445
E-mail:
Browse Graphic View a sample of the data.
Browse Graphic File Description
Associated Data Sets

 
Section 2 Data Quality Information Top of full metadata Top of page
Attribute Accuracy Source table FLDWY_FEMAPY3.DBF: The Q3 Flood Data were checked for attribute accuracy by comparing plots of the digital data to the source graphic and by symbolized display on an interactive computer system. Selected attributes that could not be visually verified were individually queried. In addition, an ARC/INFO Arc Macro Language (AML) software program was applied to the dataset to test the attributes against a master set of valid attributes for the specific data category, and a complete set of valid attribute combinations.
Logical Consistency Polygon and chain-node topology are present. Certain node-area-line relationships are collected or generated to satisfy topological requirements. Some of these requirements include: lines must begin and end at nodes, lines must connect to each other at nodes, lines do not extend through nodes, left and right areas are defined for each line segment and are consistent throughout the files, and the lines representing the limits of the file neatlines are free of gaps. Tests of logical consistency were performed by ARC/INFO software modules. Check plots were made to test for leaks in all internal polygons.
Completeness Data completeness for Q3 Flood Data files reflect the content of the source graphic. Features may have been eliminated or generalized on the source graphic, due to scale and legibility constraints. Flood risk data are developed for communities participating in the NFIP for use in insurance rating and for floodplain management. Flood hazard areas are determined using statistical analysis of records of river flow, storm tides, and rainfall; information obtained through consultation with the communities: floodplain topographic surveys; and hydrological and hydraulic analysis. Both detailed and approximate analyses are employed. Generally, detailed analyses are used to generate flood risk data only for developed or developing areas of communities. For undeveloped areas where little or no development is expected to occur, FEMA uses approximate analyses to generate flood risk data. Typically, only drainage areas that are greater than one square mile are studied. Q3 Flood Data may be derived from DFIRM-DLGs, from FIRM-DLGs, from FIRMs digitized previously for emergency applications, or may be newly created files. In Q3 Flood Data derived from older data sets, certain items may not have been captured or may have been captured differently from the current Q3 Flood Data specifications. In some cases, preliminary FIRM data have been included in the Q3 Flood Data files. These data have been provided to the community for their review and comment, and may be subject to change before their final publication date. In addition, in some cases, areas designated as Flood Prone Areas on maps prepared by USGS and FIA have been included in the Q3 Flood Data files. These areas were delineated based on available information on past floods, and are described by a unique attribute code that distinguishes them from areas of 1% annual chance flooding derived from FIRMs. Flood Insurance Rate Maps continually undergo revisions and updates. Some of these revisions are effected by letter (Letter of Map Revision [LOMR], Letter of Map Amendment [LOMA]). Q3 Flood Data may not reflect the most current information or information that is not mappable at the publication scale of the FIRM. To obtain the latest information, contact the address listed under distributor.
Horizontal Positional Accuracy Source layer fldwypy3: Specifications for the digitizing of FIRMs to create the Q3 Flood Data are consistent with those requirements for mapping at a scale of 1:24000. Horizontal control of Q3 Flood Data was established using USGS quadrangle maps at 1:24000 or other standard scales. Users should assess the horizontal positional accuracy of the Q3 Flood Data with regard to the selected base map sources and the requirements of their application. With increased frequency, large-scale spatial data sets are becoming widely available for computer-based geographic information systems. Q3 Flood Data may be used in combination with other digital spatial data; however, users should be aware that scalar enlargements do not enhance the relative accuracy of the Q3 Flood Data.
Vertical Positional Accuracy Source layer fldwypy3: None
Lineage Attribute Lineage for source table FLDWY_FEMAPY3.DBF: The Q3 Flood Data were checked for attribute accuracy by comparing plots of the digital data to the source graphic and by symbolized display on an interactive computer system. Selected attributes that could not be visually verified were individually queried. In addition, an ARC/INFO Arc Macro Language (AML) software program was applied to the dataset to test the attributes against a master set of valid attributes for the specific data category, and a complete set of valid attribute combinations.
Source Scale Denominator Source layer fldwypy3: 24000
 
Section 3 Spatial Data Organization Information Top of full metadata Top of page
Native Data Set Environment Arc/Info 7.1.1
Geographic Reference for Tabular Data
Spatial Object Type vector
Vendor Specific Object Types polygon
Tiling Scheme county
 
Section 4 Spatial Reference Information Top of full metadata Top of page
Horizontal Coordinate Scheme UTM
Ellipsoid GRS1980
Horizontal Datum NAD83
Horizontal Units meters
Distance Resolution
Altitude Datum Not Applicable
Altitude Units Not Applicable
Depth Datum Not Applicable
Depth Units Not Applicable
Cell Width
Cell Height
Latitude Resolution
Longitude Resolution
UTM Zone Number 15
SPCS Zone Identifier
County Coordinate Zone Identifier
Coordinate Offsets or Adjustments Not Applicable
Map Projection Name Transverse Mercator
Map Projection Parameters Not Applicable
Other Coordinate System's Definition Not Applicable
 
Section 5 Entity and Attribute Information Top of full metadata Top of page
Entity and Attribute Overview Data Elements for Attribute Table FLDWY_FEMAPY3.DBF:

FLOODPLN: Extent of 100 and 500 year flood plains

FLOODWAY2: Open Water Flag

Entity and Attribute Detailed Citation
Value Domain for Data Element FLOODPLN:
100 = Extent of 100 year flood plain
500 = Extent of 500 year flood plain

Value Domain for Data Element FLOODWAY2:
0 = Not Open water
1 = Open Water
 
Section 6 Distribution Information Top of full metadata Top of page
Publisher Minnesota DNR - MIS Bureau
Publication Date 2003-09-04 00:00:00.0
Contact Person Information Hal Watson
GIS Database Coordinator
DNR-MIS
500 Lafayette Road, Box 11
St. Paul, MN 55155-4011
Phone: (651) 259-5508
FAX: (651) 297-4946
E-mail:
Distributor's Data Set Identifier fldwy_femapy3
Distribution Liability The Minnesota Department of Natural Resources makes no representation or warranties, express or implied, with respect to the reuse of data provided herewith, regardless of its format or the means of its transmission. There is no guarantee or representation to the user as to the accuracy, currency, suitability, or reliability of this data for any purpose. The user accepts the data as is, and assumes all risks associated with its use. By accepting this data, the user agrees not to transmit this data or provide access to it or any part of it to another party unless the user shall include with the data a copy of this disclaimer. The Minnesota Department of Natural Resources assumes no responsibility for actual or consequential damage incurred as a result of any user reliance on this data.
Transfer Format Name Shapefile
Transfer Format Version Number Not Applicable
Transfer Size 51
Ordering Instructions See Online Linkage or Distribution Contact
Online Linkage http://deli.dnr.state.mn.us/
 
Section 7 Metadata Reference Information Top of full metadata Top of page
Metadata Date 2008-06-06 09:04:34.0
Contact Person Information Glenn Radde, Wetlands GIS Manager
DNR-Waters
500 Lafayette Road Central Office - Box 32
St. Paul, MN 55155
Phone: 651-259-5690
FAX: (651) 296-0445
E-mail:
Metadata Standard Name Minnesota Geographic Metadata Guidelines
Metadata Standard Version 1.2
Metadata Standard Online Linkage http://www.gis.state.mn.us/stds/metadata.htm



This page last updated: 2008-06-06 09:04:34.0