Flood Risk Zones

Metadata also available as

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: TNRIS - Miguel Pavon, Rich Arnold
Publication_Date: 2004
Title: Flood Risk Zones
Geospatial_Data_Presentation_Form: vector digital data
Other_Citation_Details:
See Cross Reference section for original source, time reference for counties listed corresponds to publication date of Q3 fema data, other sources have unknown publication date/content date for their county floodplain data.
Online_Linkage: \\Samwise\HDrive\TGSdata\ts-fema_fp_updated.shp
Description:
Abstract:
These shapefiles were developed from original FEMA Flood Insurance Rate Maps and other sources indicating the 100 year floodplain.
Purpose:
To show the 100 year floodplain in 87 counties in the state of Texas.
Time_Period_of_Content:
Time_Period_Information:
Multiple_Dates/Times:
Single_Date/Time:
Calendar_Date: Angelina County 3/26/1996
Single_Date/Time:
Calendar_Date: Aransas County 4/13/1998
Single_Date/Time:
Calendar_Date: Archer County 5/10/1996
Single_Date/Time:
Calendar_Date: Austin County 3/26/1996
Single_Date/Time:
Calendar_Date: Bandera County 7/29/1998
Single_Date/Time:
Calendar_Date: Bastrop County 3/26/1996
Single_Date/Time:
Calendar_Date: Bell County 3/26/1996
Single_Date/Time:
Calendar_Date: Bexar County 3/26/1996
Single_Date/Time:
Calendar_Date: Blanco County 7/27/1998
Single_Date/Time:
Calendar_Date: Bowie County 3/26/1996
Single_Date/Time:
Calendar_Date: Brazoria County 3/26/1996
Single_Date/Time:
Calendar_Date: Brazos County 3/26/1996
Single_Date/Time:
Calendar_Date: Brooks County 3/26/1996
Single_Date/Time:
Calendar_Date: Burleson County 3/26/1996
Single_Date/Time:
Calendar_Date: Burnet County 7/29/1998
Single_Date/Time:
Calendar_Date: Calhoun County 3/26/1996
Single_Date/Time:
Calendar_Date: Cameron County 3/26/1996
Single_Date/Time:
Calendar_Date: Chambers County 5/6/1998
Single_Date/Time:
Calendar_Date: Collin County 3/26/1996
Single_Date/Time:
Calendar_Date: Comal County 3/26/1996
Single_Date/Time:
Calendar_Date: Dallas County 5/10/1996
Single_Date/Time:
Calendar_Date: Denton County 5/10/1996
Single_Date/Time:
Calendar_Date: Eastland County 7/30/1998
Single_Date/Time:
Calendar_Date: Edwards County 7/29/1998
Single_Date/Time:
Calendar_Date: El Paso County 5/10/1996
Single_Date/Time:
Calendar_Date: Fayette County 3/26/1996
Single_Date/Time:
Calendar_Date: Fort Bend County 3/26/1996
Single_Date/Time:
Calendar_Date: Galveston County 6/18/1998
Single_Date/Time:
Calendar_Date: Grayson County 3/26/1996
Single_Date/Time:
Calendar_Date: Grimes County 3/26/1996
Single_Date/Time:
Calendar_Date: Guadalupe County 3/26/1996
Single_Date/Time:
Calendar_Date: Hardin County 3/26/1996
Single_Date/Time:
Calendar_Date: Hays County 7/31/1998
Single_Date/Time:
Calendar_Date: Hidalgo County 3/26/1996
Single_Date/Time:
Calendar_Date: Houston County 3/26/1996
Single_Date/Time:
Calendar_Date: Jackson County 3/26/1996
Single_Date/Time:
Calendar_Date: Jasper County 3/26/1996
Single_Date/Time:
Calendar_Date: Jefferson County 4/22/1998
Single_Date/Time:
Calendar_Date: Johnson County 3/26/1996
Single_Date/Time:
Calendar_Date: Kendall County 7/31/1998
Single_Date/Time:
Calendar_Date: Kenedy County 5/6/1998
Single_Date/Time:
Calendar_Date: Kerr County 7/29/1998
Single_Date/Time:
Calendar_Date: Kleberg County 5/5/1998
Single_Date/Time:
Calendar_Date: Lee County 3/26/1996
Single_Date/Time:
Calendar_Date: Liberty County 11/6/1995
Single_Date/Time:
Calendar_Date: Llano County 7/27/1998
Single_Date/Time:
Calendar_Date: Lubbock County 5/15/1996
Single_Date/Time:
Calendar_Date: McLennan County 3/26/1996
Single_Date/Time:
Calendar_Date: Madison County 3/26/1996
Single_Date/Time:
Calendar_Date: Mason County 7/29/1998
Single_Date/Time:
Calendar_Date: Matagorda County 4/17/1998
Single_Date/Time:
Calendar_Date: Medina County 7/31/1998
Single_Date/Time:
Calendar_Date: Montgomery County 3/26/1996
Single_Date/Time:
Calendar_Date: Nacogdoches County 3/26/1996
Single_Date/Time:
Calendar_Date: Nueces County 4/13/1998
Single_Date/Time:
Calendar_Date: Orange County 3/26/1996
Single_Date/Time:
Calendar_Date: Polk County 3/26/1996
Single_Date/Time:
Calendar_Date: Potter County 3/26/1996
Single_Date/Time:
Calendar_Date: Real County 8/6/1998
Single_Date/Time:
Calendar_Date: San Augustine County 3/26/1996
Single_Date/Time:
Calendar_Date: San Jacinto County 3/26/1996
Single_Date/Time:
Calendar_Date: San Patricio County 3/26/1996
Single_Date/Time:
Calendar_Date: Shelby County 3/26/1996
Single_Date/Time:
Calendar_Date: Tarrant County 5/3/1996
Single_Date/Time:
Calendar_Date: Travis County 3/26/1996
Single_Date/Time:
Calendar_Date: Trinity County 3/26/1996
Single_Date/Time:
Calendar_Date: Uvalde County 7/27/1998
Single_Date/Time:
Calendar_Date: Victoria County 3/26/1996
Single_Date/Time:
Calendar_Date: Walker County 3/26/1996
Single_Date/Time:
Calendar_Date: Waller County 3/26/1996
Single_Date/Time:
Calendar_Date: Washington County 3/26/1996
Single_Date/Time:
Calendar_Date: Webb County 3/26/1996
Single_Date/Time:
Calendar_Date: Wharton County 3/26/1996
Single_Date/Time:
Calendar_Date: Wichita County 3/26/1996
Single_Date/Time:
Calendar_Date: Willacy County 3/26/1996
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Unknown
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -106.908097
East_Bounding_Coordinate: -93.315999
North_Bounding_Coordinate: 35.637445
South_Bounding_Coordinate: 25.705598
Keywords:
Theme:
Theme_Keyword_Thesaurus:
REQUIRED: Reference to a formally registered thesaurus or a similar authoritative source of theme keywords.
Theme_Keyword: Floodplain,floodzone.
Place:
Place_Keyword: Texas
Access_Constraints: None
Use_Constraints: None
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Craig Eissler
Contact_Organization: Texas Geographic Society
Contact_Position: user liaison
Contact_Address:
Address_Type: mailing and physical address
Address: 514 Terrace Dr
City: Austin
State_or_Province: Texas
Postal_Code: 78704
Country: USA
Contact_Voice_Telephone: 512-912-9695
Contact_Facsimile_Telephone: 512-912-0035
Contact_Electronic_Mail_Address: craig@texasgs.org
Contact_Instructions:
for additional contact refer to:

www.texasgs.org or

www.thmp.info

Native_Data_Set_Environment:
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 8.3.0.800
Cross_Reference:
Citation_Information:
Originator: FEMA, Federal Emergency Management Agency
Publication_Date: Unknown
Title: Digital Flood Insurance Rate Maps, Q3 maps
Geospatial_Data_Presentation_Form: vector digital data
Other_Citation_Details: <http://www.msc.fema.gov/q3flooda.shtml>
Online_Linkage: <http://www.esri.com/data/download/fema>

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The Q3 Flood Data are countywide vector files derived from the FEMA Flood Insurance Rate Maps (FIRMS). The attribute definitions may be found in the "Q3 Flood Data Specfications". Attribute accuracy was tested by manual comparison of source graphic with hardcopy plots and a symbolizied display on an interactive computer graphic 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. (See also Entity Attribute Information).
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value: See Explanation
Attribute_Accuracy_Explanation:
Attribute accuracy is described, where present, with each attribute defined in the Entity and Attribute Section.
Logical_Consistency_Report:
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_Report:
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 anaylses 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. The Q3 Flood Data coverages 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 distinquishes them from areas of 1% annual chance of 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 FIRM. To obtain the latest information, contact the address listed under distributor.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
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 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 (i.e. 1:24000).
Lineage:
Source_Information:
Source_Scale_Denominator: 240000
Type_of_Source_Media: CD-ROM
Source_Citation_Abbreviation: FEMA
Source_Contribution: Federal Emergency Management Agency
Process_Step:
Process_Description: Data was merged from Q3 FEMA Counties
Process_Date: 2004
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Miguel A. Pavon
Process_Step:
Process_Description: Data from Data Services was merged
Process_Date: 2004
Process_Step:
Process_Description:
Q3 data from FEMA was merged with the Texas Services Floodplain data for Counties with no Q3 data and features were dissolved
Process_Date: 2004
Process_Step:
Process_Description:
Q3 Flood Data format was produced by either scanning or manually digitizing a hardcopy version of the graphic materials. The scanning process captured the digital data and the resulting raster data was vectorized and attributed on an interactive editing station. Manual digitizing used a digitizing table to capture the digital data; attribution was performed either as the data was digitized or on an interactive edit station after the digitizing was completed. The determination of the production methodology was based on various criteria, including availability of production systems. Four control points corresponding to the four corners of the map were used for registration during manual digitizing. A projection transformation was performed on the coordinates used in the data collection and editing systems to register the digital data to the Universal Transverse Mercator (UTM) grid coordinates. The ARC/INFO coverage of the Q3 Flood Data was generated, and it was also used to create the Q3-DLG file. The Q3 Flood Data was checked for position and attribute accuracy by comparing plots of the digital data to the graphic source and by symbolizing display on an interactive computer graphic system. Selected attributes that could not be visually verified were individual 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 graphics were revised to reflect updates effected by Letters of Map Change (Letter of Map Revision (LOMR), Letter of Map Amendment (LOMA)). These revisions were included in the Q3 Flood Data if they were mappable at the publication scale of the source graphic. Once final, the ARC/INFO coverage was projected into a geographic grid system using decimal degree latitude and longitude coordinates and then converted into an ARC/INFO export file and MapInfo native table files. In addition, the ARC/INFO coverage in UTM coordinates was converted into a Digital Line Graph file. All final files were checked for logical consistency and completeness.

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 31938

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Albers Conical Equal Area
Albers_Conical_Equal_Area:
Standard_Parallel: 27.500000
Standard_Parallel: 35.000000
Longitude_of_Central_Meridian: -100.000000
Latitude_of_Projection_Origin: 18.000000
False_Easting: 1500000.000000
False_Northing: 6000000.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.002048
Ordinate_Resolution: 0.002048
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: ts-fema_fp_updated
Attribute:
Attribute_Label: FID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: ZONE

Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Craig Eisler
Contact_Organization: Texas Geographic Society
Contact_Position: User Liaison
Contact_Address:
Address_Type: mailing and physical address
Address: 514 Terrace Dr.
City: Austin
State_or_Province: Texas
Postal_Code: 78704
Country: USA
Contact_Voice_Telephone: 512-912-9695
Contact_Facsimile_Telephone: 512-912-0035
Contact_Electronic_Mail_Address: craig@texasgs.org
Resource_Description:
Downloadable Data www.thmp.info
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 218.169
Fees: none
Ordering_Instructions: Download from www.thmp.info
Turnaround: immediate

Metadata_Reference_Information:
Metadata_Date: 20040820
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Texas Water Development Board
Contact_Person: Miguel Pavon, David Pimentel
Contact_Position: Administrator Texas/Mexico Borderlands Information Center
Contact_Address:
Address_Type: mailing and physical address
Address: 1700 N. Congress Av.
Address: Room B-40
City: Austin
State_or_Province: Texas
Postal_Code: 78757
Country: USA
Contact_Voice_Telephone: 512 463-8399
Contact_TDD/TTY_Telephone: 1-800-RELAY TX
Contact_Facsimile_Telephone: 512 463-7274
Contact_Electronic_Mail_Address: mpavon@bic.state.tx.us
Hours_of_Service: 8 - 5
Contact_Instructions: e-mail contact method is preffered.
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile

Generated by mp version 2.7.33 on Fri Aug 20 15:27:45 2004