{7A5A7E02-E65D-465A-AD89-416C8D611D6C} eng utf8 dataset Josh Krochmal U.S. Environmental Protection Agency, Emergency Operations Center GIS Analyst 202-564-8753 1200 Pennsylvania Ave NW, Ariel Rios North Bldg B441A, Mail Code 5104A Washington DC 20460 krochmal.josh@epa.gov pointOfContact 2026-05-20 NAP - Metadata 1.2 complex 1270281 4269 EPSG 6K Quads Map Service for ER Reference, US, EPA, SEGS 2008-06-01 publication Draft U.S. Environmental Protection Agency originator U.S. EPA Office of Solid Waste and Emergency Response (OSWER) - Office of Emergency Management (OEM) Washington, DC publisher mapDigital This dynamic web map service contains reference quads for emergency response reconnaissance developed for use by the US Environmental Protection Agency. Grid cells are based on densification of the USGS Quarterquad (1:12,000 scale or 12K) grids for the continental United States, Alaska, Hawaii and Puerto Rico and are roughly equivalent to 1:6000 scale (6K) quadrangles approximately 2 miles long on each side. Note: This data set is also available as a downloadable national-scale file (>80MB) and as individual regional subsets. Each regional extract includes a 20 mile buffer of tiles around each EPA Region. 1:6000 scale reference quads for emergency response reconnaissance developed for use by the US Environmental Protection Agency U.S. Environmental Protection Agency, USGS completed Josh Krochmal U.S. Environmental Protection Agency, Emergency Operations Center GIS Analyst 202-564-8753 1200 Pennsylvania Ave NW, Ariel Rios North Bldg B441A, Mail Code 5104A Washington DC 20460 krochmal.josh@epa.gov publisher asNeeded United States place EPA Place Names 2015-01-31 publication Disaster Response Spills theme EPA GIS Keyword Thesaurus 2017-01-23 publication 020:107 theme Federal Program Inventory 2013-09-16 publication EPA Data License https://edg.epa.gov/EPA_Data_License.html licenseUnrestricted https://edg.epa.gov/EPA_Data_License.html unclassified http://project-open-data.github.io/schema/#accessLevel Standard Technical Controls vector eng utf8 -179 -64 17 72 Publication date 2006-08-01T00:00:00 2006-08-01T00:00:00 To provide a base reference grid system for the entire United States as a pre-staged resource for tracking and planning emergency response activities such as reconnaisance of debris after natural disasters, oil spill cleanups and planning of monitoring activities. These data were originally developed by Weston Solutions for the United States Environmental Protection Agency. During an EPA response, 6K quad layer should be related to a look-up table (see example table in MS Access file included in the download file) tblMASTER_STATE_GRID_LU_4SDE100406) to update and map response status efforts. The Lookup table to be used in ArcSDE to relate many 6k quad grid cells to different geographies (State and County). 24k grids for Alaska and non-CONUS areas also included because their shapes boundaries do not exactly match with child 6k cells. Data elements of the lookup table: REC_NUM Number unique id - comes from unique record number created in parent grid layers. Initially named as 6k_ref, then Ref_6k Ref_ID Text Created by concatenating [STATE]-[Rec_Num]. Initially was named as Ref_6ks STATE Text State Name - there can be multiple records with same rec_num but different state name STATUS Text Current Grid Cell Status field. Default value is 'NA'. Other possible values are 'Open', 'Closed' and 'Active' LOCKSTATUS Text Indicates a locked value for record. Possible valuesare 'NA'(default), 'Open', 'Closed' and 'Active' LOCK_CMNT Text When LocakStatus field value is not NA then, a comment in this field indicates who implemented lockstatus, and why. QQQUAD_REF Number Value from Rec_num field of '24ksubquadbound.shp' or orginal SubQuad layer which was created only for gulf coast hurricane prone areas. QQQUADREFT Text Ref_ID value from '24ksubquadbound.shp' CONUS Yes/No identifies grid cells which will be part of final 6k quad layer but Continental US areas only SEL_12K Yes/No Identifies all cells that intersect with 12k layer. Initially named as 12k_sel Christopher Burgess USEPA Emergency Operations Center USEPA Emergency Operations Center Manager 202-564-3850 1200 Pennsylvania Ave. NW Federal Triangle Complex: Ariel Rios Building - Basement Washington DC 20460 burgess.christopher@epa.gov distributor http://geodata.epa.gov/ArcGIS/rest/services/OSWER/EPA6kQuads/MapServer ESRI:ArcGIS EPA 6k Quads Map Service webService https://edg.epa.gov/data/PUBLIC/OLEM/6kquads_epa.zip file Data Download Zipped shapefiles download dataset Feature data programmatically generated. See "Processing Steps" identified below. Data are complete to the extents indicated: CONUS, Alaska, Hawaii, and Puerto Rico The geospatial part of this data set was mathematically generated using ESRI 24k topo map boundary are initial reference. The positional accuracy for these quadrangles is limited by the resolution of the source data set which is 51 meters, long with the internal precision level for ArcGIS, which is 11 cm. For information on source data sets and processing used to derive this data set, please see the information in the process steps section below. Assigned state abbreviation codes for grid cells whose centers that fell in coastal waters, large inland waters and for U.S. commonwealths, territories and associated areas such as Puerto Rico, US Virgin Islands and pacific islands and territories. 2006-01-02T00:00:00 quads6k_us.shp layer is extracted from a base layer 'vectorgrid.shp'. Vectorgrid layer extents are as follows: MinX: -179 MaxX: -64 MinY: 17 MaxY: 72 These extents cover all CONUS, Alaska, Hawaii, and Puerto Rico. Total number of records in vectorgrid.shp is approx. 6.5 million. Grid Cell Height - .03125 degrees Grid Cell width - .03125 degrees quads6k_us.shp: This layer is slightly different from 12k or 24k quad layers. It is created strictly as 1/4th scale of a 24k quad grid, which is 1/4th of 7.5 Degrees X 7.5 Degrees i.e. 0.03125 degrees X 0.03125 degrees. Actual Quad map differ from strictly square grid shape, in some areas outside of CONUS. Field Definitions for 6k Quad Layer: Label (Text) - Label value (Unique). Sel_12k (T/F): Identifies all cells that intersect with 12k layer. Initially named as 12k_sel QQQuad_ref (Number): Value from Rec_num field of '24ksubquadbound.shp' or orginal SubQuad layer which was created only for gulf coast hurricane prone areas. QQQuadRefT (Text): Ref_ID value from '24ksubquadbound.shp' Final_sel (T/F): identifies grid cells which will be part of final 6k quad layer. Conus (T/F): identifies grid cells which will be part of final 6k quad layer but Continental US areas only Rec_num (Number): Unique id for each 6k tile. Initially named as 6k_ref, then Ref_6k Link table tblMASTER_STATE_GRID_LU_4SDE - this is a lookup table for identifying all 6k grid tiles that belong to each single state. This table has many duplicate records with same value for ref_num. However ref_id value is unique. State: State that each tile belongs to. This field is found in link table Ref_ID (string): a concatenated string id [State]-[Ref_6k]. Initially named as Ref_6ks 2006-08-01T00:00:00 unknown 2013-03-19