Water Level Surfaces - 1990-1999

CAUTION TO USERS - See discussion below regarding the surfaces for WCA2A and 2B

In December 2011, PROVISIONAL daily water-level surfaces for the period 1/1/1991 through 12/31/1999 were created using the newly revised EDEN V2 surface-water model. (Extreme dry conditions in 1990 require additional processing of 1990 surfaces.) About 25% of the EDEN network of gages was operational back to 1990, therefore significant hindcasting of datasets, gapfilling of missing measured data, and quality assurance of water-level data was required prior to input to the model. Further analysis of the hindcast datasets and revised water-level surfaces (1990-1999) will be generated by early February 2012.

A summary of the input data includes:

• Data for all gages was compiled from multiple sources
• Data gaps were filled using one of several estimation methods
• Data for structure gages (G300_T, G339_H, and G339_T) were not hindcasted prior to their initial date of operation
• Data for marsh gages were hindcasted back to 1/1/1990 even when the gage was not constructed at that time.

EDEN Gages (1990-1999) Data Status The map to the right shows the location and data status for 1990-1999 EDEN water-level surfaces. [larger version] A spreadsheet lists all gages in the EDEN network used in the surface-water model (.xls file, 71 KB), period of measured data, and whether they were hindcasted back to 1990 (based on type of gage, i.e. structure gage). A tab-delimited text file is also availble for this data set.

Users are cautioned about the quality of the water-level surfaces for several subareas prior to using the data:

• WCA2A: For the period 1/1/1990-12/31/1999, most of the water-level data for gages in WCA2A were hindcasted. Resulting water-level surfaces show inconsistencies compared with surfaces post-2000 and will require further analysis. Water-level surfaces in WCA2A should be used with caution for this period until further analysis is completed and revised surfaces are generated.·        
• WCA2B: For the period 1/1/1990 – 4/27/1993, no data is available for the northern boundary structures (S144_T, S145_T, S146_T), therefore the water-level surfaces in WCA3B are not considered valid in the northern portion of the subarea.·        
• Pennsuco Wetlands: The surface for this subarea is modeled only when data for 5 or more gages is available.

NetCDF Files:

NetCDF (Network Common Data Form) is a set of freely-distributed software libraries and machine-independent binary data formats that support the creation, access, and sharing of large array-oriented scientific data. This format replaces the bulky file structure and difficult file management of ESRI GRIDS for EDEN data. It also allows EDEN applications to run on computers without ArcGIS installations.

Each file contains 3 months (one quarter-year) of daily datasets. For example, the data for every day in 1992 will be stored in 4 files: 1992_q1.nc, 1992_q2.nc, 1992_q3.nc, and 1992_q4.nc. In addition, each zip file contains a readme file which contains brief information about release notes related to this data release.

NetCDF Files File naming conventions: v# = version of surface water model (v1 or v2), r# = release of surface (r1 or r2), prov = provisional New: You may download a year's worth of data all at once. Simply click the link below for each year. Because of file size limits, the most you can download at one time is a year. If you need to download several year's worth of data at once, please contact Heather Henkel (hhenkel@usgs.gov) and other arrangements can be made. Date 1/1 - 3/31 4/1 - 6/30 7/1 - 9/30 10/1 - 12/31 1990: Not yet available 1991 (zip, 69 MB) 1991 Q1 (zip, 18 MB) v2prov, December 2011 1991 Q2 (zip, 18 MB) v2prov, December 2011 1991 Q3 (zip, 18 MB) v2prov, December 2011 1991 Q4 (zip, 18 MB) v2prov, December 2011 1992 (zip, 69 MB) 1992 Q1 (zip, 18 MB) v2prov, December 2011 1992 Q2 (zip, 18 MB) v2prov, December 2011 1992 Q3 (zip, 18 MB) v2prov, December 2011 1992 Q4 (zip, 18 MB) v2prov, December 2011 1993 (zip, 69 MB) 1993 Q1 (zip, 18 MB) v2prov, December 2011 1993 Q2 (zip, 18 MB) v2prov, December 2011 1993 Q3 (zip, 18 MB) v2prov, December 2011 1993 Q4 (zip, 18 MB) v2prov, December 2011 1994 (zip, 69 MB) 1994 Q1 (zip, 18 MB) v2prov, December 2011 1994 Q2 (zip, 18 MB) v2prov, December 2011 1994 Q3 (zip, 18 MB) v2prov, December 2011 1994 Q4 (zip, 18 MB) v2prov, December 2011 1995 (zip, 68 MB) 1995 Q1 (zip, 18 MB) v2prov, December 2011 1995 Q2 (zip, 18 MB) v2prov, December 2011 1995 Q3 (zip, 18 MB) v2prov, December 2011 1995 Q4 (zip, 18 MB) v2prov, December 2011 1996 (zip, 69 MB) 1996 Q1 (zip, 18 MB) v2prov, December 2011 1996 Q2 (zip, 18 MB) v2prov, December 2011 1996 Q3 (zip, 18 MB) v2prov, December 2011 1996 Q4 (zip, 18 MB) v2prov, December 2011 1997 (zip, 69 MB) 1997 Q1 (zip, 18 MB) v2prov, December 2011 1997 Q2 (zip, 18 MB) v2prov, December 2011 1997 Q3 (zip, 18 MB) v2prov, December 2011 1997 Q4 (zip, 18 MB) v2prov, December 2011 1998 (zip, 69 MB) 1998 Q1 (zip, 18 MB) v2prov, December 2011 1998 Q2 (zip, 18 MB) v2prov, December 2011 1998 Q3 (zip, 18 MB) v2prov, December 2011 1998 Q4 (zip, 18 MB) v2prov, December 2011 1999 (zip, 69 MB) 1999 Q1 (zip, 18 MB) v2prov, December 2011 1999 Q2 (zip, 18 MB) v2prov, December 2011 1999 Q3 (zip, 18 MB) v2prov, December 2011 1999 Q4 (zip, 18 MB) v2prov, December 2011 2000 - Current available on separate page   Additional Documentation for EDEN NetCDF Files: Release Notes (for V1 and V2 of the surfaces) Release Log Metadata EDEN NetCDF Data Format (.pdf, 4 KB) A Quick Guide to Using EDEN NetCDF Files in ArcGIS 9.2 (.pdf, 62 KB)

 

GeoTiff