USDA/NRCS - National Cartography and Geospatial Center
Geocomm.com
20030224
QUADS24K_NRCSGEOCOMM_US
vector digital data
QUADS24K_NRCSGEOCOMM_US
USDA/NRCS - National Cartography & Geospatial Center
https://gdg.sc.egov.usda.gov/
http://data.geocomm.com/quadindex/
Index grid of USGS 24K quadrangles for the Lower 48 United States and Hawaii. Merge of undocumented national shapefile downloaded from geocomm.com and quad shapefiles from NRCS that had additional useful attribute information. NRCS shapefiles were only collected for the Northeastern. This metadata record is a combination of metadata from NRCS and a description of EPA Region 2 process steps.
Vector dataset provides digital raster graphic (DRG) quad boundaries with attributes describing the quads.
Data were processed in the following steps by Harvey Simon of EPA Region 2 GIS on 03/10/06:
1) Downloaded individual state grid shapefiles from USDA/NRCS Gateway (https://gdg.sc.egov.usda.gov/)
2) Used ArcTools merge function to combine the different state index shapefiles for the Northeast
3) Used ArcTools dissolve function to remove duplicate grid cells
4) Edited one polygon (Chincoteague Quad) vertex to eliminate sliver gap between two cells.
5) Imported data into Oracle Spatial using R2 data conversion procedures
en
Publication date
20030224
unknown
-160.375000
-66.875000
18.875000
49.500000
-160.375000
-66.875000
49.500000
18.875000
Standard for Geospatial Dataset File Naming
Map Index
Quadrangles
None
United States
ISO 19115 Topic Category
EPA GIS Keyword Thesaurus
User
No access constraints
The U.S. Department of Agriculture, Service Center Agencies should be acknowledged as the data source in products derived from these data.
This data set is not designed for use as a primary regulatory tool in permitting or citing decisions, but may be used as a reference source. This is public information and may be interpreted by organizations, agencies, units of government, or others based on needs; however, they are responsible for the appropriate application. Federal, State, or local regulatory bodies are not to reassign to the Service Center Agencies any authority for the decisions that they make. The Service Center Agencies will not perform any evaluations of these data for purposes related solely to State or local regulatory programs.
Photographic or digital enlargement of these data to scales greater than at which they were originally mapped can cause misinterpretation of the data. Digital data files are periodically updated, and users are responsible for obtaining the latest version of the data.
NRCS for data for Northeastern states, and geocomm.com for national (lower 48) shapefile.
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.0.1221
Shapefile
None
Unclassified
Not applicable
EPA/Region2/GIS Team
Harvey Simon
GIS Coordinator
mailing and physical address
290 Broadway
New York
NY
10007
202-566-0917
Visually examined for consistency in ArcMap and ArcCatalog to ensure that no slivers or duplicate polygons were created while merging a number of state shapefiles. No errors found.
Merge of NRCS shapefiles and geocomm.com shapefiles were examined against known quad status grids for New York State and New Jersey and digital raster graphics and found to align perfectly. Data set was displayed at various extents to check for completeness. Attribute table values were compared against available data for New York State and found to be consistent.
Data are complete for most northeastern and Great Lakes states. Rest of lower 48 and Hawaii are complete spatially, but lack full attribution that had been included in NRCS shapefiles.
Undocumented in original metadata, but accuracy should be near perfect, since the vertices of the grid are for predetermined lat/longs.
200206
Source: http://greenwood.cr.usgs.gov/pub/quad-indexes. Then NRCS-ITC converted to Lon/Lat NAD83. Forced all coordinates to nearest even increment of 7.5 minutes to remove precision problems from being re-projected. Updated quad name, add quad date field, add missing quads. Generate FIPS_C field of inside, crossing, touching counties.
National Cartography and Geospatial Center
mailing and physical address
501 W. Felix St, Bldg 23
Fort Worth
TX
76115
Not available
20060314
Data were processed in the following steps by Harvey Simon of EPA Region 2 GIS on 03/14/06: Combined features of
1) Merged 24 K state indexes from USDA/NRCS gateway for Northeastern and GL states, and
2) Undocumented shapefile C:\WorkSpace\grids\24kgrid.shp downloaded from http://data.geocomm.com/quadindex/ Also had undefined geometry. This shapefile is for the entire US, but has less attribute content than the NRCS data.
2a) Defined projection of national 24K shapefile from geocomm.com coverage to geographic NAD83 and compared to existing DOQ index for New York State in ArcMap. Geometry appeared to overlay perfectly.
2b) Geocomm.com had duplicate polygons at state boundaries, problem from merge of individual state layers. Performed dissolve to remove duplicate polygons.
3) To collect the attributes from the NRCS Northeastern coverage, calculated new MRC field to allow join of the two coverages:
Formula to calculate the new field was: UCASE((LEFT((RIGHT([QUADID],7)),5)) & "-" & (RIGHT([QUADID],2)))
Joined the national shapefile to the NRCS shapefile for the NE and Great Lakes and exported to final shapefile with add ional attributes.
4) Edited NRCS metadata to reflect mix of data sources and process steps.
5) Imported data into Oracle Spatial using R2 data conversion procedures
EPA/Region2/GIS Team
Harvey Simon
GIS Coordinator
mailing and physical address
290 Broadway
New York
NY
10007
202-566-0917
Dataset copied.
24000
online
NRCS
Quadrangle attributes for northeastern and Great Lake States
publication date
20030224
USGS and NRCS
2002
Quadrangle Index
24000
online
Geocomm.com
Shapefile of 1:24K USGS quadrangles for lower 48 states and Hawaii.
publication date
2006
USGS as provided by Geocomm.com
Unknown
Quadrangle Index
Vector
Simple
Polygon
FALSE
54012
FALSE
FALSE
G-polygon
54012
Undefined
0.000010
Undefined
Explicit elevation coordinate included with horizontal coordinates
0.000000
0.000000
Decimal degrees
North American Datum of 1983
Geodetic Reference System 1980
6378137.000000
298.257222
QUADS24K_NRCSGEOCOMM_US
Feature Class
54012
FID
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
FID
OID
4
0
0
Shape
Feature geometry.
ESRI
Coordinates defining the features.
Shape
Geometry
0
0
0
NAME
NAME
String
30
STATE
STATE
String
2
LAT
LAT
String
6
LONG_
LONG_
String
8
MRC
MRC
String
8
QUADID
QUADID
String
8
QUADDATE
QUADDATE
Float
19
11
FIPS_C
FIPS_C
String
42
STPO
STPO
String
12
MRC_1
MRC_1
String
8
Shape_Leng
Shape_Leng
Float
19
11
Shape_Area
Area of feature in internal units squared.
ESRI
Positive real numbers that are automatically generated.
Shape_Area
Float
19
11
Attributes from the NRCS index maps identify the file and quad names, quad scales, quad dates and locational FIPS code. Geographic coordinates for the bottom, top, left and right sides of each quad are provided as well. Attributes from Geocomm.com also identify the state.
Relevant attributes are: NAME - quad name, STATE - U.S. State identified in geocomm.com layer,QUADID - USGS latitude/longitude file name from NRCS layer, QUADDATE - date that appears on the paper quad from NRCS layer, FIPS_C - state and county 5-digit FIPS codes for the quad from NRCS layer, STPO - State abbreviation from NRCS layer, MRC - USGS Quad ID from geocomm.com layer, MRC1 - calculated Quad ID from string manipulation of NRCS QuadID field. Used to join NRCS and Geocomm layers.
Downloadable Data
Although these data have been processed successfully on a computer system at the U.S. Environmental Protection Agency no warranty expressed or implied is made regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. Users should be aware that the data are combined from two different sources.
Request by email
None
7.005
7.005
EPA/Region2/GIS Team
Harvey Simon
GIS Coordinator
mailing and physical address
290 Broadway
New York
NY
10007
202-566-0719
20060824
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
EPA/Region2/GIS Team
Harvey Simon
GIS Coordinator
mailing and physical address
290 Broadway
New York
NY
10007
202-566-0719
20060425
17021300
FALSE
20060824
09322800
20060824
09322800
{9459E0DD-762F-428F-81FC-97DB14532B4C}
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.0.1221
QUADS24K_NRCSGEOCOMM_US
-160.375
-66.875
49.5
18.875
1
-160.375
-66.875
49.5
18.875
1
ISO 19115 Geographic Information - Metadata
DIS_ESRI1.0
dataset
002
file://\\3257-HULTGREN\D\Public\Data\national_ref_grids\24K\QUADS24K_NRCSGEOCOMM_US.shp
Local Area Network
7.005
Shapefile
GCS_North_American_1983
54012
20060824