Earth Data Analysis Center
20131204
Williamsburg Special Flood Hazard Areas (SFHA)
vector digital data
Albuquerque, NM
Earth Data Analysis Center
http://rgis.unm.edu
https://gstore.unm.edu/apps/rgis/datasets/9f428306-f0d6-4c83-bffc-859426589b41/williamsburgSFHA.original.zip
https://gstore.unm.edu/apps/rgis/datasets/9f428306-f0d6-4c83-bffc-859426589b41/metadata/FGDC-STD-001-1998.xml
https://gstore.unm.edu/apps/rgis/datasets/9f428306-f0d6-4c83-bffc-859426589b41/metadata/FGDC-STD-001-1998.html
https://gstore.unm.edu/apps/rgis/datasets/9f428306-f0d6-4c83-bffc-859426589b41/metadata/ISO-19115:2003.xml
https://gstore.unm.edu/apps/rgis/datasets/9f428306-f0d6-4c83-bffc-859426589b41/metadata/ISO-19115:2003.html
https://gstore.unm.edu/apps/rgis/datasets/9f428306-f0d6-4c83-bffc-859426589b41/metadata/ISO-19110.xml
This vector dataset depicts the 1% annual flood boundary (otherwise known as special flood hazard area or 100 year flood boundary) for its specified area. The data set was generated by heads-up-digitizing flood insurance rate maps available from FEMA's Map Service Center. These maps are for informational use only and should not be used for engineering or insurance purposes. Contact your local floodplain administrator for more information.
This vector file is intended to be used for planning and mitigation purposes. It is not appropriate to use for engineering or insurance purposes.
20131213
publication date
As Necessary
-107.298419
-107.284181
33.119347
33.110951
ISO 19115 Topic Categories
boundaries
none
special flood hazard area
SFHA
100 Year flood zone
1% annual chance flood zone
flood insurance rate map
Spatial Reference System Identifiers
EPSG:4326
Spatial Reference System Identifiers
EPSG:3857
Country
U.S.
State
New Mexico
none
Sierra
None
None
Earth Data Analysis Center
Clearinghouse Manager
mailing and physical address
MSC01 1110
1 University of New Mexico
Albuquerque
NM
87131-0001
USA
505-277-3622 ext. 230
505-277-3614
clearinghouse@edac.unm.edu
0800 - 1700 MT, M-F -7 hours GMT
Microsoft Windows Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.3000
This data set contains no additional attributes other than those added by ESRI during the shapefile creation process.
unknown
Data contained in this shapefile is complete to the best of our knowledge.
Data was heads up digitized off of georeferenced and mosaiced FEMA FIRM Maps from the Mapping Service Center. Many of these maps were converted by letter from original HUD maps from the 1960's and 1970's. No positional accuracy should be assumed from this dataset.
This dataset contains little to no vertical data.
Federal Emergency Management Agency
20111130
Flood Insurance Rate Map
online
20131130
publication date
FIRM
spatial information
Appropriate FIRMs were downloaded from the FEMA Mapping Service Center
20130601
Individual FIRMs were georeferenced in ERDAS IMAGINE. This process required matching control points on the FIRM maps to the same points on a reference image that that had previously been georeferenced. Control points are usually well mapped features such as drainage and road intersections and Public Land Survey System intersections. The statewide 1:24,000 topographic quad map mosaic was selected as the reference image because both these maps and the FIRM maps had similar features to map. The process consisted of opening two viewers side by side on the monitor and displaying the topo mosaic on one viewer and the same area of the FIRM map in the second viewer. Then a feature such as a drainage intersection was selected on the FIRM map and the line and column coordinates of that feature were placed in a table. Then the same feature was selected from the topo mosaic and the actual map coordinates of the feature were entered into the table next to the FIRM line and column coordinate. Then a second feature was located on both viewers and then a third and so on. The features were selected to have a relatively even distribution over the FIRM map area. When all features had been selected the IMAGINE software generates a transformation matrix which calculates the best fit of the FIRM control points to the topo mosaic points. If the operator is satisfied with the calculated fit the command is then given to resample the FIRM map to match the topo mosaic and generate a new FIRM map image which now has map coordinates.
20130615
When all of the maps for a county had been georeferenced it was possible to trim off all of the extraneous edge data from the maps and mosaic them together based on the georeferenced information present in each of the maps.
20130801
Special Flood Hazard Boundaries were heads-up-digitized using ESRI ArcGIS Version 10.1.
20131115
New Mexico
Vector
GT-polygon composed of chains
1
Special Flood Hazard Area Boundary
Boundaries for Special Flood Hazard Areas
EDAC
FID
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Feature geometry.
Esri
Coordinates defining the features.
Id
ID field
ESRI
ID field
Shape_Leng
length of feature in internal units
ESRI
length of feature in internal units
Shape_Area
Area of feature in internal units squared.
Esri
Positive real numbers that are automatically generated.
Earth Data Analysis Center
Clearinghouse Manager
mailing and physical address
MSC01 1110
1 University of New Mexico
Albuquerque
NM
87131-0001
USA
505-277-3622 ext. 230
505-277-3614
clearinghouse@edac.unm.edu
0800 - 1700 MT, M-F -7 hours GMT
Downloadable Data
The material on this site is made available as a public service. Maps and data are to be used for reference purposes only and the Earth Data Analysis Center (EDAC), Resource Geographic Information System (RGIS) and The University of New Mexico are not responsible for any inaccuracies herein contained. No responsibility is assumed for damages or other liabilities due to the accuracy, availability, use or misuse of the information herein provided. Unless otherwise indicated in the documentation (metadata) for individual data sets, information on this site is public domain and may be copied without permission; citation of the source is appreciated.
ZIP
1
https://gstore.unm.edu/apps/rgis/datasets/9f428306-f0d6-4c83-bffc-859426589b41/williamsburgSFHA.original.zip
Download from Resource Geographic Information System (RGIS) at http://rgis.unm.edu.
None. The files are available to download from Resource Geographic Information System (RGIS) (http://rgis.unm.edu).
Contact Earth Data Analysis Center at clearinghouse@edac.unm.edu
Contact Earth Data Analysis Center at clearinghouse@edac.unm.edu
Adequate computer capability is the only technical prerequisite for viewing data in digital form.
20240329
Earth Data Analysis Center
Clearinghouse Manager
mailing and physical address
MSC01 1110
1 University of New Mexico
Albuquerque
NM
87131-0001
USA
505-277-3622 ext. 230
505-277-3614
clearinghouse@edac.unm.edu
0800 - 1700 MT, M-F -7 hours GMT
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time