Alan Rea and Robert L. Tortorelli
1999
Digital Data Sets of Depth-Duration Frequency of Precipitation for Oklahoma, USGS OFR 99-463.
Version 1.0, July 29, 1999
map
USGS Open-File Report
USGS OFR 99-463
Reston, VA
U.S. Geological Survey
http://water.usgs.gov/lookup/getspatial?ofr99-463_contours
These geospatial data sets consist of contours
derived from surface grids of precipitation depths for
seven frequencies at 12 durations used in a regional
precipitation frequency analysis for Oklahoma. Eighty-four
depth-duration-frequency contour maps were produced from
precipitation-station data. The contour interval varies from
0.05 to 0.5 inch.
Data were used from precipitation gage stations with at least 10
years of record within Oklahoma and about 50 kilometers into
bordering states. Data were analyzed for seven frequencies
(expressed as recurrence intervals of 2-, 5-, 10-, 25-, 50-, 100-,
and 500-years) and 12 durations (15-, 30-, and 60-minutes; 1-,
2-, 3-, 6-, 12-, and 24-hours; and 1-, 3-, and 7-days).
Statistical methods were used to estimate precipitation depths
for each duration-frequency at each station. These station
depth-duration-frequency estimates were interpolated to produce
continuous grids with grid-cell spacing of 2,000 meters. Contour
lines derived from these surfaces (grids) were used to produce
the maps in the "Depth-Duration Frequency of Precipitation for
Oklahoma," by R.L. Tortorelli, Alan Rea, and W.H. Asquith, U.S.
Geological Survey Water-Resources Investigations Report 99-4232.
These data sets were used to produce the maps in the
Depth-Duration Frequency of Precipitation for Oklahoma
(Tortorelli, Rea, and Asquith, 1999).
The contours were derived from the DDF surfaces using the
ARC/INFO command LATTICECONTOUR (ESRI, 1997). Contour intervals
were chosen so the contour lines are fairly dense on the
depth-duration frequency of precipitation maps to make
interpolation easy. The lower limit of 0.05 inch for the contour
lines is used since some annual precipitation maxima data in the
data base (especially the 15-minute data set) were reported only
to the nearest 0.1 inch. The contour intervals for the
15-minute to 60-minute durations range between 0.05 to 0.2 inch.
The contour intervals for the 1-hour to 24-hour durations range
from 0.05 to 0.5 inch. The contour intervals for the 1-day to
7-day durations range from 0.1 to 0.5 inch.
A few contours have minor anomalies that ordinarily would
be removed for publication. The contours match the interpolated
surfaces in Oklahoma because the precipitation station data,
contours, and surfaces are being published in digital form.
Therefore, it was decided to maintain consistency between the
the digital data sets. For this reason no editing such as
smoothing, generalization or removal of contours within Oklahoma
has been applied to the contour maps. It is intended that the
maps be used to estimate the precipitation depth values only
within Oklahoma.
Related Data sets--
The precipitation stations data sets and DDF surface data sets
are being published with these data sets.
Other References Cited--
Environmental Systems Research Institute, Inc. (ESRI), 1997,
ARC/INFO Command Reference, ARC/INFO Version 7.1.1 on-line
help: Redlands, CA.
Tortorelli, R.L., Rea, Alan, and Asquith, W.H., 1999
Depth-duration frequency of precipitation for Oklahoma:
U.S. Geological Survey Water-Resources Investigation Report
(WRIR) 99-4232, 113 p.
Notes--
Any use of trade, product, or firm names is for descriptive purposes
only and does not imply endorsement by the
U.S. Government.
Although this Federal Geographic Data Committee-compliant metadata
file is intended to document the data set in nonproprietary form,
as well as in ARC/INFO format, this metadata file may include some
ARC/INFO-specific terminology.
1999
Publication date
None Planned
-103.24278975
-94.16607991
37.30957951
33.30532373
none
Precipitation Frequency Analysis
Precipitation Intensity
Precipitation contours (isohyets)
inlandWaters
none
Oklahoma
none
These data are designed for regional analyses appropriate to the
2,000-meter grid cell size of the surfaces from which these
contours are derived.
Alan Rea
U.S. Geological Survey
Hydrologist
mailing and physical address
230 Collins Road
Boise
Idaho
83702
USA
1-888-275-8747
(208)387-1372
(ahrea@usgs.gov)
This data set was created under a cooperative agreement with the
Oklahoma Department of Transportation.
SunOS, 5.5.1, sun4u UNIX
ARC/INFO version 7.2.1
The results of the error analysis for precipitation depth are
described in the metadata for the surfaces data sets (surfaces.htm).
Chain-node topology present.
For more information see Tortorelli, Rea, and Asquith, 1999.
Precipitation station locations used in the depth-duration
frequency analyses were recorded to the nearest 1 minute of
latitude and longitude. The contours were derived from
surface grids with 2,000-meter grid cell size.
First draft of metadata created by ahrea using
FGDCMETA.AML ver. 1.33 07/15/99 on ARC/INFO data set
/proj/temp1/okrain/cdproto/arc_data/7day/con500yr
19990729
Vector
String
65
Albers Conical Equal Area
29.5
45.5
-96
23
0.00000
0.00000
coordinate pair
79.8
79.8
Meters
North American Datum of 1983
GRS1980
6378206.4
294.98
Each depth-duration-frequency contour data set is identified by its
name and position in the directory structure. For example, the
CON100YR data set in the 7day subdirectory contains
precipitation-depth contours for the 100-year 7-day precipitation
event. All depths are in inches. The first major code in the
DLG-format file contains depths expressed in hundredths of an
inch because the DLG format requires major and minor codes to be
integer values.
Data-set fields are defined, as in the following example, for
the 7-day duration and 500-year frequency:
>
>CON500YR.AAT:
>
> FIELD NAME FIELD CONTENTS
>--------------------------------------------------------------
>FNODE# ARC/INFO Standard field
>TNODE# ARC/INFO Standard field
>LPOLY# ARC/INFO Standard field
>RPOLY# ARC/INFO Standard field
>LENGTH ARC/INFO Standard field
>CON500YR# ARC/INFO Standard field
>CON500YR-ID ARC/INFO Standard field
>INCHES Interpolated value of 500-year precip event (inches)
>MAJOR1 Same as INCHES field, but in hundredths of an inch
>MINOR1 Zero (required for DLG format conversion)
>
>
none
U.S. Geological Survey
Ask USGS - Water Webserver Team
mailing
445 National Center
Reston
VA
20192
1-888-275-8747 (1-888-ASK-USGS)
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Although this data set has been used by the U.S. Geological
Survey, U.S. Department of the Interior, no warranty expressed or
implied is made by the U.S. Geological Survey as to the accuracy
of the data and related materials. The act of distribution shall not
constitute any such warranty, and no responsibility is assumed by
the U.S. Geological Survey in the use of this data, software, or
related materials.
Any use of trade, product, or firm names is for descriptive
purposes only and does not imply endorsement by the U.S.
Government.
Other
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http://water.usgs.gov/GIS/dsdl/ofr99-463_raw_data.tar.gz
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http://water.usgs.gov/GIS/dsdl/ofr99-463_arc_12hour.tar.gz
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http://water.usgs.gov/GIS/dsdl/ofr99-463_arc_15min.tar.gz
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http://water.usgs.gov/GIS/dsdl/ofr99-463_arc_1hour.tar.gz
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http://water.usgs.gov/GIS/dsdl/ofr99-463_arc_24hour.tar.gz
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http://water.usgs.gov/GIS/dsdl/ofr99-463_arc_3day.tar.gz
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http://water.usgs.gov/GIS/dsdl/ofr99-463_pd_12hour.tar.gz
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http://water.usgs.gov/GIS/dsdl/ofr99-463_pd_15min.tar.gz
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http://water.usgs.gov/GIS/dsdl/ofr99-463_pd_1day.tar.gz
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http://water.usgs.gov/GIS/dsdl/ofr99-463_pd_1hour.tar.gz
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http://water.usgs.gov/GIS/dsdl/ofr99-463_pd_24hour.tar.gz
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http://water.usgs.gov/GIS/dsdl/ofr99-463_pd_2hour.tar.gz
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http://water.usgs.gov/GIS/dsdl/ofr99-463_pd_30min.tar.gz
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http://water.usgs.gov/GIS/dsdl/ofr99-463_pd_3day.tar.gz
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http://water.usgs.gov/GIS/dsdl/ofr99-463_pd_3hour.tar.gz
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http://water.usgs.gov/GIS/dsdl/ofr99-463_pd_60min.tar.gz
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http://water.usgs.gov/GIS/dsdl/ofr99-463_pd_6hour.tar.gz
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http://water.usgs.gov/GIS/dsdl/ofr99-463_pd_7day.tar.gz
None. This dataset is provided by USGS as a public service.
20041108
U.S. Geological Survey
Ask USGS -- Water Webserver Team
mailing
445 National Center
Reston
VA
20192
1-888-275-8747 (1-888-ASK-USGS)
http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ofr99-463_contours
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998