Digital Data Used to Relate Nutrient Inputs to Water Quality in the Chesapeake Bay Watershed, Version 1.0.
DATA SETS
-
- Online_Linkage:
- Arc/Info Export format from dgux,
5.4R3.10, AViiON UNIX, ARC/INFO version 7.1:
Use Load to local disc:
Water Quality.e00
- Gunzipped SDTS Topological Vector Profile (TVP) format:
Use Load to local disc:
Water Quality.tgz
Network
-
- Online_Linkage:
- Polygon Version
- Arc/Info Export format from dgux,
5.4R3.10, AViiON UNIX, ARC/INFO version 7.1:
Use Load to local disc:
Network.e00
- Gunzipped SDTS Topological Vector Profile (TVP) format:
Use Load to local disc:
Network.tgz
- Raster Version (GRID)
- Arc/Info Export format from dgux,
5.4R3.10, AViiON UNIX, ARC/INFO version 7.1:
Use Load to local disc:
GRID Network.e00
- ASCII Format - see notes at bottom of page
Use Load to Local Disc:
ASCII GRID network.txt.gz
-
- Online_Linkage:
- Arc/Info Export format from dgux,
5.4R3.10, AViiON UNIX, ARC/INFO version 7.1:
Use Load to local disc:
reach.e00
- Gunzipped SDTS Topological Vector Profile (TVP) format:
Use Load to local disc:
reach.tgz
Nutrient-Input Sources
-
- Online_Linkage:
- Arc/Info Export format from dgux,
5.4R3.10, AViiON UNIX, ARC/INFO version 7.1:
Use Load to local disc:
atdep.e00
- ASCII format: - see notes at bottom of page
Use Load to local disc:
atdep.txt
- Mean values by SPARROW watershed segment
ASCII format: - see notes at bottom of page
Use Load to local disc:
atdep.mean
-
- Online_Linkage:
- Arc/Info Export format from dgux,
5.4R3.10, AViiON UNIX, ARC/INFO version 7.1:
Use Load to local disc:
cbwspnts.e00
- Gunzipped SDTS Topological Vector Profile (TVP) format:
Use Load to local disc:
cbwspnts.tgz
-
-
- Online_Linkage:
- Arc/Info Export format from dgux,
5.4R3.10, AViiON UNIX, ARC/INFO version 7.1:
Use Load to local disc:
agloads.e00
- Gunzipped SDTS Topological Vector Profile (TVP) format:
Use Load to local disc:
agloads.tgz
Land-Surface Characteristics
-
- Online_Linkage:
- Arc/Info Export format from dgux,
5.4R3.10, AViiON UNIX, ARC/INFO version 7.1:
Use Load to local disc:
precip.e00
- ASCII format: - see notes at bottom of page
Use Load to local disc:
precip.txt
- Mean values by SPARROW watershed segment
ASCII format: - see notes at bottom of page
Use Load to local disc:
precip.mean
-
- Online_Linkage:
- Arc/Info Export format from dgux,
5.4R3.10, AViiON UNIX, ARC/INFO version 7.1:
Use Load to local disc:
temp.e00
- ASCII format: - see notes at bottom of page
Use Load to local disc:
temp.txt
- Mean values by SPARROW watershed segment
ASCII format: - see notes at bottom of page
Use Load to local disc:
temp.mean
-
- Online_Linkage:
- Arc/Info Export format from dgux,
5.4R3.10, AViiON UNIX, ARC/INFO version 7.1:
Use Load to local disc:
slope.e00
- ASCII format: - see notes at bottom of page
Use Load to local disc:
slope.txt
- Mean values by SPARROW watershed segment
ASCII format: - see notes at bottom of page
Use Load to local disc:
slope.mean
-
- Online_Linkage:
- Arc/Info Export format from dgux,
5.4R3.10, AViiON UNIX, ARC/INFO version 7.1:
Use Load to local disc:
perm.e00
- ASCII format: - see notes at bottom of page
Use Load to local disc:
perm.txt
- Mean values by SPARROW watershed segment
ASCII format: - see notes at bottom of page
Use Load to local disc:
perm.mean
Vector data sets are distributed in ARC/INFO export (.e00) format and
gunzipped SDTS (.tgz) format. Raster data are distributed in ARC/INFO
export (.e00) format and ASCII (.txt) format.
Average data (*.mean) files are distributed in ASCII comma delimited format.
They represent average values by SPARROW watershed segments, Version I. The
first column in the unique reach isentification number (ERF1##).
The second column is the average value for that watershed.
All SDTS files were created from ARC/INFO ARCSDTS
If the end user of an ARCSDTS file does not have access to the
SDTSARC command, the file can be converted into an Arc coverage
by first uncompressing it with the UNIX gzip command, which will
create a UNIX tar file. If the compressed ARCSDTS file does not have
a .tgz or .gz suffix, it must be renamed (UNIX mv command) to have
one. Second, the user must perform a UNIX tar xvof command on
the tar file and all SDTSEXPORT .DDF files will be loaded into the
workspace the "tar xvof" command is issued. Last, the user must
issue the Arc SDTSIMPORT command with the < in_transfer_prefix >
being the first four characters of the prefix to the .DDF files and the
< out_cover > being the prefix to the tar file. PC users can use unzip
to create STDS .DDF files from downloaded .zip files.
All text (.txt) files are ASCII files created from ARC/INFO GRIDASCII
where xxx is a number, and the keyword nodata_value is optional and
defaults to -9999. The end of each row is terminated with a carriage return
in the file.
- NCOLS xxx
- NROWS xxx
- XLLCENTER xxx|XLLCORNERxxx
- YLLCENTER xxx|YLLCORNER xxx
- CELLSIZE xxx
- NODATA_VALUE xxx
- row1
- row2
- .
- .
- .
- row n
To load .txt Files into ArcView:
1. Use gunzip to uncompress the file if it is a .gz extension (<filename>.gz)
2. Start Arcview GIS and be sure the Spatial Analyst extension is turned on. The do this,
select File and Extensions... and check the Spatial Analyst.
3. Open existing or start a new project. Open and/or make a View active.
4. Import the gridded ASCII file you by selecting File and then Import Grids....
The Import File Type should be set to ASCII.
5. In the Import ASCII Files dialog box, change the "List Files of Type" to All Files (*.*).
Select the unzipped ASCII file.
6. At this point you must provide Arcview GIS with an output file name (the default is imgrd1)
for the imported grid. Be sure you are saving in the correct directory and then type in the filename.
7. At the dialog box "Import Grids: ..." Cell values as integers? Select "yes."
8. Now go to a View, and add a theme. In the Add Theme dialog box, change type of theme from Featured Data Source to Gridded Data Source. Then simply select the imported grid that you saved in step 6.
Return to report Digital Data Used to Relate
Nutrient Inputs to Water Quality in the Chesapeake Bay
Last modified: 98-12-31.15:53:01.Thu