Wolock, D. M. 1997 Open-File Report 656 Lawrence, KS U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?muid This digital data release consists of an ARC/INFO grid and associated INFO tables. The grid is called MUID and has STATSGO (U.S. Department of Agriculture, 1994) soil mapping unit identifiers gridded on a 1-kilometer resolution for the conterminous United States. The INFO tables have soil characteristics data in them. The ITEMS in the tables are weighted average values for several soil characteristics in the STATSGO data base. The weighted average values were computed by aggregating the soil layers and components in the data base. The INFO tables are called MUID.LAYER, MUID.COMP, MUID.KFACT, MUID.TFACT, and MUID.WEG. The INFO tables can be related or joined to the MUID grid or to individual State coverages (grids or polygons) of MUIDs. Joining or relating the tables to the MUID grid creates 1-kilometer resolution grids of the soil characteristics for the conterminous United States. The soil characteristics in MUID.LAYER are permeability (PERML and PERMH in the STATSGO data base), available water capacity (AWCL and AWCH), bulk density (BDL and BDH), and organic matter (OML and OMH). The soil characteristics in MUID.COMP are slope (SLOPEL and SLOPEH), depth to seasonally high water table (WTDEPL and WTDEPH), and depth to bedrock (ROCKDEPL and ROCKDEPH). The soil characteristic in MUID.KFACT is the soil erodibility factor (KFACT), the soil characteristic in MUID.TFACT is the soil loss tolerance factor (TFACT), and the soil characteristic in MUID.WEG is the wind erosion group (WEG). The MUID grid and INFO tables were created with a set of arc macro language (aml) and Fortran programs. Send electronic mail to dwolock@usgs.gov to obtain copies of the computer code. (See Procedures_Used.) The data were derived for use in regional (multi-state) and national studies requiring estimates of soil characteristics. The georeferenced soil characteristics were intended to be averaged over large areas, such as over a river basin, and used (1) for watershed simulation models that require spatially lumped estimates of soil hydraulic parameters and (2) as explanatory variables in regional and national water-quality assessment studies. Procedures used The STATSGO data were processed on a Data General desktop computer using Data General Unix operating system. Processing was accomplished using a set of amls and Fortran programs. Contact dwolock@usgs.gov for copies of the computer code. Deriving MUID "average" values for land-surface slope, depth to the seasonally high water table, and total soil thickness required that a weighted average value be computed for all the soil components in a soil mapping unit. The average was computed by weighting the component values by their percentage composition of the MUID. For example, suppose MUID AL005 was 35 percent component A, 25 percent component B, and 40 percent component C. Further assume that the SLOPEL value for component A was 3 percent, the SLOPEL value for component B was 6 percent, and the SLOPEL value for component C was missing. The weighted average value (AVE) of SLOPEL for MUID AL005 would then be: AVE = (0.35 * 3 + 0.25 * 6) / (0.35 + 0.25) = 4.25 inches per hour. Deriving MUID average values for permeability, available water capacity, bulk density, organic matter content, soil erodibility factor, soil loss tolerance factor, and wind erodibility group required that a weighted average value be computed for all the soil layers in a soil component, and then a weighted average value be computed for all the soil components in a soil mapping unit. First, the component average values were computed by weighting the layer values by their thickness. Second, the MUID average was computed by weighting the component average values by their percentage composition of the MUID. Each step of the two-step weighting process was done exactly as described above, except first the layer values were weighted by their thicknesses, and then the component values were weighted by their percentage composition. The following steps describe how the STATSGO data were processed. 1. Place the STATSGO compact disk (CD) in reader (path name should be /pdd/cdrom/). 2. Start up ARC and then GRID in a working directory that contains the file fnsoils and the grid MASKGRD. (The file fnsoils contains State names and abbreviations for those States to be processed. A complete list of the State names and abbreviations is given at the end of the Procedures_Used section. The grid MASKGRD sets the processing window and cell size. A description of MASKGRD is given at the end of the Procedures_Used section.) 3. Open a plotting window (device 9999). 4. Launch soilcd.aml. This aml calls statsmuid.aml. This step generates a subdirectory for each State, and it derives a numeric MUID grid for each State. 5. Launch mergemuids.aml. This aml merges the MUID grids for each State into a master MUID grid (called MUID) for the conterminous United States. A mask grid (called MASKGRD) must be in the working directory to set the window and cell size. 6. Launch copytab.aml from the main working directory with the arguments muidgrd.tab and muid.mast. This aml copies the MUIDGRD INFO tables from each State directory into a master table called MUID.MAST in the main working directory. 7. Use joinitem to join MUID.MAST to MUID.VAT. 8. Drop the item GOTDAT from MUID.VAT. 9. Delete the nmexico line from fnsoils. The COMP table for New Mexico on the CD is incorrect. (See step 13.) 10. Launch compcd.aml. This aml calls comppro.f. This step computes soil component weighted average values for ROCKDPEL, ROCKDEPH, WTDEPL, WTDEPH, SLOPEL, SLOPEH, and COMPPER. The item COMPPER is the percentage of components used to determine the weighted average value. Component percentages do not always sum to 100 percent. A separate INFO table called NEWCOMP.TAB is created in each State directory. 11. Launch statscdbig.aml so that it calls statstab.aml. This aml can call either statstab.aml or statsmult.aml. (Commenting out one of the call statements in statscdbig.aml determines which aml will run.) When statstab.aml is run, soil characteristics averages aggregated first by layer, and then by component, are computed for PERML, PERMH, AWCL, AWCH, OML, OMH, BDL, and BDH. The item COMPPER (percentage of total components aggregated) is also computed. A separate INFO table called NEWLAYER.TAB is created in each State directory. The Fortran programs layertabone.f and comptab.f are called by statstab.aml. The Fortran programs layertabone1.f and comptab1.f are called by statsmult.aml. 12. Launch statscdbig.aml so that it calls statsmult.aml. Running statsmult.aml from within statscdbig.aml will compute KFACT, TFACT, and WEG. Separate INFO tables called KFACT.TAB, TFACT.TAB, and WEG.TAB are created in each State directory. 13. Get correct copies of the COMP and LAYER tables for New Mexico and place them in the nm directory. The COMP table on the CD is incorrect. A correct version of the COMP table can be obtained from Fred Minzenmayer (fminzenm@ftw.nrcs.usda.gov). 14. Launch compnm.aml from the nm directory. This aml computes soil component weighted average values of ROCKDPEL, ROCKDEPH, WTDEPL, WTDEPH, SLOPEL, SLOPEH, and COMPPER for the New Mexico data. 15. Launch multnm.aml from the nm directory. This aml computes KFACT, TFACT, and WEG for New Mexico. The Fortran programs layertabone1.f and comptab1.f are called by multnm.aml. 16. Launch statsnm.aml from the nm directory. This aml computes PERML, PERMH, AWCL, AWCH, BDL, and BDH, OML, and OMH for New Mexico data. The Fortran programs layertabone.f and comptab.f are called by statsnm.aml. 17. Launch copytab.aml from the main working directory with the arguments KFACT.TAB and KFACT.MAST. This aml copies the KFACT INFO tables from each State directory into a master table in the main working directory. The table MUID.KFACT is a copy of KFACT.MAST. 18. Launch copytab.aml from the main working directory with the arguments NEWCOMP.TAB and NEWCOMP.MAST. This aml copies the NEWCOMP INFO tables from each State directory into a master table in the main working directory. The table MUID.COMP is a copy of NEWCOMP.MAST. 19. Launch copytab.aml from the main working directory with the arguments NEWLAYER.TAB and NEWLAYER.MAST. This aml copies the NEWLAYER INFO tables from each State directory into a master table in the main working directory. The table MUID.LAYER is a copy of NEWLAYER.MAST. 20. Launch copytab.aml from the main working directory with the arguments TFACT.TAB and TFACT.MAST. This aml copies the TFACT INFO tables from each State directory into a master table in the main working directory. The table MUID.TFACT is a copy of TFACT.MAST. 21. Launch copytab.aml from the main working directory with the arguments WEG.TAB and WEG.MAST. This aml copies the WEG INFO tables from each State directory into a master table in the main working directory. The table MUID.WEG is a copy of WEG.MAST. List of State name abbreviations in the file called fnsoils- al alabama ar arkansas az arizona ca california co colorado ct connecticut de delaware fl florida ga georgia ia iowa id idaho il illinois in indiana ks kansas ky kentucky la louisiana ma massachusetts md maryland me maine mi michigan mn minnesota mo missouri ms mississippi mt montana nc ncarolina nd ndakota ne nebraska nh nhamshire nj njersey nm nmexico nv nevada ny nyork oh ohio ok oklahoma or oregon pa pennsylvania ri risland sc scarolina sd sdakota tn tennessee tx texas ut utah va virginia vt vermont wa washington wi wisconsin wv wvirginia wy wyoming Description of the grid MASKGRD- Cell Size = 1000.000 Data Type: Integer Number of Rows = 3058 No Value Attribute Table Number of Columns = 4771 Attribute Data (bytes) = -1 BOUNDARY STATISTICS Xmin = -2462303.668 Minimum Value = 0.000 Xmax = 2308696.332 Maximum Value = 0.000 Ymin = 176796.666 Mean = 0.000 Ymax = 3234796.666 Standard Deviation = -2.000 COORDINATE SYSTEM DESCRIPTION Projection ALBERS Units METERS Spheroid CLARKE1866 Parameters: 1st standard parallel 29 30 0.000 2nd standard parallel 45 30 0.000 central meridian -96 0 0.000 latitude of projection's origin 23 0 0.000 false easting (meters) 0.00000 false northing (meters) 0.00000 Reviews applied to data The MUID grid and associated INFO tables received technical reviews in January and February 1997. The review materials provided to each reviewer included the following: (1) the MUID grid, (2) the associated info tables, and (3) a draft of the documentation that will accompany the grid and INFO tables. The reviewers were asked (1) to evaluate technical correctness of the method used to derive the MUID grid and info tables, and (2) the completeness and accuracy of the documentation. The reviewers' comments and author's responses are summarized below. REVIEWER- Kerie Hitt, USGS 1. Rename the INFO tables so that they all begin with the suffix MUID. Response: Done. 2. Remove the boiler plate text under sections not filled out. Response: Done. 3. Specify the platform and operating system. Response: Done. 4. Consolidate steps 17-21 in the Procedures_Used section. Response: Consolidation of the steps would decrease the clarity of the description. Therefore, I did not consolidate steps 17-21. 5. List the STATSGO polygon coverage as a related spatial data set. Response: Done. 6. Clarify the elimination of MUIDs associated with water bodies. Response: Done. 7. Clarify what Fortran programs are called by which amls. Response: Done. REVIEWER- Barbara Ruddy 1. Clarify aggregation process in LAYER and COMP tables. Response: Done. REVIEWER- Naomi Nakagaki 1. Rename tables so that they all begin with MUID. Response: Done. 2. Include all amls and Fortran programs in documentation. Response: At this point, I am not going to include the amls and programs. The programs are not well documented and may evolve over time. When I am confident that the programs and their output will remain unchanged for some time, then I will document the programs and include them with the data set documentation. Related spatial data sets- STATSGO polygon coverages of MUIDs for each of the conterminous United States are on the 1994 CD-ROM. The INFO tables MUID.xxx can be joined or related to the polygon coverages using the alphanumeric MUID as the relate item. Other references cited- U.S. Department of Agriculture, 1994, State Soil Geographic (STATSGO) Data Base, Data use information. U.S. Department of Agriculture Miscellaneous Publication Number 1492, Fort Worth, Texas. 35 p. Notes- If joinitem is used to connect the INFO tables to MUIDs, remember to weed out the MUIDs for which there are no soil data values in the INFO tables. This can be done by reselecting for GOTDAT EQ 1. GOTDAT is an item in the INFO table that indicates data exist for an MUID. The "official" STATSGO data base on CD-ROM in ARC/INFO format from the U.S. Department of Agriculture was used to generate the derivative data. The COMP table for New Mexico on the CD is corrupt/bad/wrong. The U.S. Department of Agriculture provided a correct COMP table, which is used to generate the data described here. A correct version of the COMP table can be obtained from Fred Minzenmayer (fminzenm@ftw.nrcs.usda.gov). There is an error in the LAYER table for Colorado. A WEG value is out of range for component 2 of MUID CO326. This component was ignored in computing the weighted average value of WEG for CO326. The average value of WEG was computed "by hand" for CO326 and substituted into the table WEG.MAST. There are errors in WTDEPL and WTDEPH values for the following MUIDs: CA004, CA050, CA765, CA767, KS443, MT144, NM722, OK050, OK105, and OK142. The values for WTDEPL and WTDEPH were out of range for components of these MUIDs. The erroneous values were excluded in computing the weighted average values for these MUIDs. Average values of WTDEPL and WTDEPH were computed "by hand" for these MUIDs and substituted into the table NEWCOMP.MAST. The use of trade names in this documentation is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. 1994 Publication date of STATSGO data Complete As needed -129.4956 -64.4393 48.6336 21.8079 None Soils, STATSGO, conterminous United States inlandWaters None Conterminous United States None The STATSGO data are compiled by generalizing more detailed county soil survey maps. (See U.S. Department of Agriculture, 1994 for an explanation of how the STATSGO data were generated.) Because of their spatially generalized nature, the STATSGO data cannot be used to accurately estimate average soil characteristics for small areas. The STATSGO data-use information document states that "STATSGO data are not detailed enough to make interpretations at a county level" (U.S. Department of Agriculture, 1994). David Wolock U.S. Geological Survey Research Hydrologist mailing address

4821 Quail Crest Place

Lawrence KS 66049-3839 USA 1-888-275-8747 785-832-3500 dwolock@usgs.gov 8:00am-4:30pm CST Contact via email or telephone dgux, 5.4R3.10, AViiON UNIX, ARC/INFO version 7.0.3 U.S. Department of Agriculture 1994 Fort Worth, TX U.S. Department of Agriculture CD-ROM U.S. Department of Agriculture 1994 Miscellaneous Pub. 1492 Fort Worth, TX U.S. Department of Agriculture Methods were tested by performing test calculations by hand. See Procedures used for information on omissions and selection criteria. U.S. Department of Agriculture 1994 CD-ROM 1994 Publication date STATSGO CD-ROM The STATSGO CD-ROM provided the data from which all aggregated values were computed. See Procedures used under Supplemental Information 1997 Raster Grid Cell 3058 4771 Albers Conical Equal Area 29.5 45.5 -96 23 0.00000 0.00000 coordinate pair 1.0 1.0 METERS North American Datum of 1927 Clarke 1866 6378206.4 294.98 MUID.VAT Mapping unit identifiers STATSGO CD-ROM (polygon coverages) VALUE Unique numeric identifier value stored as a binary item in INFO Computed 1001 593666 COUNT Number of GRID cells of a VALUE Computed 1 21522 NUMID Numeric identifier stored as a binary item in INFO Computed 1001 59366 MUID Alphanumeric mapping unit identifier STATSGO CD-ROM Two-letter state abbreviation plus a numeric value STATSGO CD-ROM MUID.STA Statistics table GRID MIN Minimum GRID cell VALUE Computed 1000 1000 MAX Maximum GRID cell VALUE Computed 59366 59366 MEAN Mean GRID cell VALUE Computed 31877.87 31877.87 STDV Standard Deviation of GRID cell VALUEs Computed 17057.906 17057.906 MUID.COMP Soil characteristics computed from COMP table STATSGO CD-ROM (COMP tables) MUID Alphanumeric mapping unit identifier STATSGO CD-ROM (COMP table) Two-letter state abbreviation plus a numeric value STATSGO CD-ROM SLOPEL Low value for the range in slope (percent) STATSGO CD-ROM (COMP tables) 0 64.83 Percent SLOPEH High value for the range in land surface slope (percent) STATSGO CD-ROM (comp tables) 1 99 Percent WTDEPL Low value for the range in depth to the seasonally high water table (feet) STATSGO CD-ROM (comp tables) 0 6 Feet WTDEPH High value for the range in depth to the seasonally high water table (feet) STATSGO CD-ROM (comp tables) 0 7.06 Feet ROCKDEPL Low value for the range in the total soil thickness examined (inches) STATSGO CD-ROM (comp tables) 1.067 61.40 Inches ROCKDEPH High value for the range in the total soil thickness examined (inches) STATSGO CD-ROM (COMP tables) 5.85 90.80 Inches COMPPER Percentage of all components of an muid used to compute the average value STATSGO CD-ROM (COMP tables) 6 100 GOTDAT A flag indicating that soil data are available for the MUID STATSGO CD-ROM (COMP tables) 1 1 MUID.KFACT Average soil erodibility factor computed for each muid STATSGO CD-ROM (comp and layer tables) MUID Alphanumeric mapping unit identifier STATSGO CD-ROM (comp tables) Two-letter state abbreviation plus a numeric value STATSGO CD-ROM KFACT Soil erodibility factor STATSGO CD-ROM (comp and layer tables) 0.039 0.64 COMPPER Percentage of all components of an muid used to compute the muid average STATSGO CD-ROM (comp and layer tables) 1 100 GOTDAT A flag indicating that soil data are available for the particular muid STATSGO CD-ROM (comp and layer tables) 1 1 MUID.LAYER Soil characteristics computed from comp and layer tables STATSGO-CD (comp and layer tables) MUID Alphanumeric mapping unit identifier STATSGO CD-ROM (comp and layer tables) Two-letter state abbreviation plus a numeric value STATSGO CD-ROM PERML Low value for the range in permeability (inches per hour) STATSGO CD-ROM (comp and layer tables) 0.013000 18.833000 Inches per hour PERMH High value for the range in permeability (inches per hour) STATSGO CD-ROM (comp and layer tables) 0.068000 20.000000 Inches per hour AWCL Low value for the range in available water capacity (fraction) STATSGO CD-ROM (comp and layer tables) 0.012000 0.489000 Fraction AWCH High value for the range in available water capacity (fraction) STATSGO CD-ROM (comp and layer tables) 0.041000 0.589000 Fraction BDL Low value for the range in bulk density (grams per cubic centimeter) STATSGO CD-ROM (comp and layer tables) 0.052000 1.682000 Grams per cubic centimeter BDH High value for the range in bulk density (grams per cubic centimeter) STATSGO CD-ROM (comp and layer tables) 0.201000 2.395000 Grams per cubic centimeter OML Low value for the range in organic matter content (percent by weight) STATSGO CD-ROM (comp and layer tables) 0.000000 70.482002 Percent by weight OMH High value for the range in organic matter content (percent by weight) STATSGO CD-ROM (comp and layer tables) 0.00000 87.511002 Percent by weight COMPPER Percentage of all components of an muid used to compute the average value STATSGO CD-ROM (comp and layer tables) 1 100 GOTDAT A flag indicating that soil data are available for the particular muid STATSGO CD-ROM (comp and layer tables) 1 1 MUID.TFACT Average soil loss tolerance factor value STATSGO CD-ROM (comp and layer tables) MUID Alphanumeric mapping unit identifier STATSGO CD-ROM (comp and layer tables) Two-letter state abbreviation plus a numeric value STATSGO CD-ROM (COMP tables) TFACT Average soil loss tolerance factor value STATSGO CD-ROM (comp and layer tables) 1 5 COMPPER Percentage of all components of an muid used to compute the average value STATSGO CD-ROM (comp and layer tables) 1 100 GOTDAT A flag indicating that soil data are available fo the particular muid STATSGO CD-ROM (comp and layer tables) 1 1 MUID.WEG Average values for wind erodibility group STATSGO CD-ROM (comp and layer tables) MUID Alphanumeric mapping unit id STATSGO CD-ROM (comp and layer tables) Two-letter state abbreviation plus a numeric value STATSGO CD-ROM WEG Wind erodibility group value STATSGO CD-ROM (comp and layer tables) 1 8 COMPPER Percentage of all components of an muid used to compute the average value STATSGO CD-ROM (comp and layer tables) 1 100 GOTDAT A flag indicating that soil data are available for the particular muid STATSGO CD-ROM (comp and layer tables) 1 1 The data consist of a grid and associated INFO tables. The grid is called MUID and has soil mapping unit identifiers gridded on a 1-kilometer resolution for the conterminous United States. The INFO tables have soil characteristics data in them. The soil characteristics are average values for several items in the STATSGO data base. The tables are called MUID.LAYER, MUID.COMP, MUID.KFACT, MUID.TFACT, and MUID.WEG. The MUID grid This grid has a unique numeric value for each MUID in the conterminous United States. The INFO table MUID.VAT contains the character MUID for each numeric value in the grid. This grid was generated using soilcd.aml, statsmuid.aml, and mergemuid.aml. (See Procedures_Used.) Some important assumptions/decisions/facts- 1. MUIDs indicating water bodies are eliminated from the grid and assigned NODATA values. These MUIDs also do not appear in the INFO tables. 2. Some MUIDs are in the grid but are not in the INFO tables. (This occurs because of missing data in the INFO tables.) When an INFO table is joined to the MUID grid using joinitem, a value of zero will be assigned to attributes associated with MUIDs that occur in the grid but not in the INFO table. After using joinitem, the attribute GOTDAT (with a value of 1) can be used to reselect MUIDs for which there are soil characteristics data. Description of MUID grid Cell Size = 1000.000 Data Type: Integer Number of Rows = 3058 Number of Values = 10446 Number of Columns = 4771 Attribute Data (bytes) = 23 BOUNDARY STATISTICS Xmin = -2462303.668 Minimum Value = 1001.000 Xmax = 2308696.332 Maximum Value = 59366.000 Ymin = 176796.666 Mean = 31862.508 Ymax = 3234796.666 Standard Deviation = 17058.361 COORDINATE SYSTEM DESCRIPTION Projection ALBERS Datum NAD27 Units METERS Spheroid CLARKE1866 Parameters: 1st standard parallel 29 30 0.000 2nd standard parallel 45 30 0.000 central meridian -96 0 0.000 latitude of projection's origin 23 0 0.000 false easting (meters) 0.00000 false northing (meters) 0.00000 The INFO table MUID.VAT This table contains a numeric mapping unit identifier that is unique in the conterminous United States. The number is computed as a combination of the numeric portion of the MUID and a unique numeric code for each State. The items in the table are: VALUE = numeric identifier stored as a binary item in INFO. COUNT = number of grid cells with corresponding VALUE. NUMID = numeric identifier (same value as VALUE) stored as an integer item in INFO. MUID = mapping unit identifier. Arc: items MUID.VAT COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 1 VALUE 4 10 B - Indexed 5 COUNT 4 10 B - - 9 NUMID 8 8 I - - 17 MUID 7 7 C - Example records- Record VALUE COUNT NUMID MUID 1 1001 869 1001 AL001 2 1002 53 1002 AL002 3 1003 243 1003 AL003 4 1004 230 1004 AL004 5 1005 607 1005 AL005 Valid ranges (MIN- and MAX-) for the items in MUID.VAT: MIN-VALUE = 1001.000000 MAX-VALUE = 59366.000000 MIN-COUNT = 1.000000 MAX-COUNT = 21522.000000 MIN-NUMID = 1001.000000 MAX-NUMID = 59366.000000 The INFO table MUID.LAYER This table contains average values of soil characteristics for each MUID. The soil characteristics are aggregated by soil layer (using the STATSGO LAYER table) and component (using the STATSGO COMP table). The items [and their units of measurement] in the table are: MUID = mapping unit identifier. PERML = low value for the range in permeability [inches per hour]. PERMH = high value for the range in permeability [inches per hour]. AWCL = low value for the range in available water capacity [fraction]. AWCH = high value for the range in available water capacity [fraction]. BDL = low value for the range in bulk density [grams per cubic centimeter]. BDH = high value for the range in bulk density [grams per cubic centimeter]. OML = low value for the range in organic matter content [percent by weight]. OMH = high value for the range in organic matter content [percent by weight]. COMPPER = percentage of all components of an MUID used to compute the MUID average value. GOTDAT = a flag indicating that soil data are available for the particular MUID. The table was made with statscdbig.aml, statstab.aml, layertabone.f, comptab.f, statsnm.aml, and copytab.aml. Except for statsnm.aml, the amls use the input file fnsoils. (See Procedures_Used.) Some important assumptions/decisions/facts- 1. Only soil components with ROCKDEPH > 0 are used. 2. Only soil layers with BDL > 0 and AWCL > 0 and PERML > 0 and LAYDEPH > 0 are used. (OML can include 0 values.) This means that the table only includes land-surface areas with soils that can be a medium through which water can flow. Rock outcrops, for example, are excluded. 3. Not all soil components in the COMP table have associated values in the LAYER table. Also, some components are rock outcrops and water, or they can be missing data. These components are not included in the MUID average, and therefore the item COMPPER can be less than 100 percent. 4. Some MUIDs are in the grid but are not in the INFO tables. (This occurs because of missing data in the INFO tables.) When an INFO table is joined to the MUID grid using joinitem, a value of zero will be assigned to attributes associated with MUIDs that occur in the grid but not in the INFO table. After using joinitem, the attribute GOTDAT (with a value of 1) can be used to reselect MUIDs for which there are soil characteristics data. Arc: items MUID.LAYER COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 1 MUID 7 7 C - - 8 PERML 4 8 F 3 - 12 PERMH 4 8 F 3 - 16 AWCL 4 8 F 3 - 20 AWCH 4 8 F 3 - 24 BDL 4 8 F 3 - 28 BDH 4 8 F 3 - 32 OML 4 8 F 3 - 36 OMH 4 8 F 3 - 40 COMPPER 4 8 F 3 - 44 GOTDAT 4 4 I - - An example record- 1 .FALSE. PERML = 0.782 PERMH = 3.413 AWCL = 0.092 AWCH = 0.136 BDL = 1.365 BDH = 1.570 OML = 0.105 OMH = 0.645 COMPPER = 100.000 GOTDAT = 1 Valid ranges (MIN- and MAX-) for the items in MUID.LAYER: MIN-PERML = 0.013000 MAX-PERML = 18.833000 MIN-PERMH = 0.068000 MAX-PERMH = 20.000000 MIN-AWCL = 0.012000 MAX-AWCL = 0.489000 MIN-AWCH = 0.041000 MAX-AWCH = 0.589000 MIN-BDL = 0.052000 MAX-BDL = 1.682000 MIN-BDH = 0.201000 MAX-BDH = 2.395000 MIN-OML = 0.000000 MAX-OML = 70.482002 MIN-OMH = 0.000000 MAX-OMH = 87.511002 MIN-COMPPER = 1.000000 MAX-COMPPER = 100.000000 MIN-GOTDAT = 1.000000 MAX-GOTDAT = 1.000000 The INFO table MUID.COMP This table contains average values of soil characteristics for each MUID. The soil characteristics are aggregated by soil component (using the STATSGO COMP table). The items [and their units of measurement] in the table are: MUID = mapping unit identifier. SLOPEL = low value for the range in land-surface slope [percent]. SLOPEH = high value for the range in land-surface slope [percent]. WTDEPL = low value for the range in depth to the seasonally high water table [feet]. WTDEPH = high value for the range in depth to the seasonally high water table [feet]. ROCKDEPL = low value for the range in the total soil thickness examined [inches]. ROCKDEPH = high value for the range in the total soil thickness examined [inches]. COMPPER = percentage of all components of an MUID used to compute the MUID average value. GOTDAT = a flag indicating that soil data are available for the particular MUID. The table was made with compcd.aml, comppro.f, compnm.aml, and copytab.aml. Except for compnm.aml, the amls use the input file fnsoils. (See Procedures_Used.) Some important assumptions/decisions/facts- 1. Only soil components with ROCKDEPH > 0 are used. 2. ROCKDEPL and ROCKDEPH measure the total thickness examined, which is usually 60 inches. If the value is less than 60 inches, then the value indicates the depth to bedrock. 3. WTDEPL and WTDEPH are measured only to a maximum of 6 feet in most States and to 8 feet in a few States. 4. Some components are rock outcrops and water, or they can be missing data. These components are not included in the MUID average, and therefore the item COMPPER can be less than 100 percent. 5. Some MUIDs are in the grid but are not in the INFO tables. (This occurs because of missing data in the INFO tables.) When an INFO table is joined to the MUID grid using joinitem, a value of zero will be assigned to attributes associated with MUIDs that occur in the grid but not in the INFO table. After using joinitem, the attribute GOTDAT (with a value of 1) can be used to reselect MUIDs for which there are soil characteristics data. 6. There are some errors in the STATSGO COMP table for WTDEPL and WTDEPH. (See Notes.) Arc: items MUID.COMP COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 1 MUID 7 7 C - - 8 SLOPEL 4 8 F 3 - 12 SLOPEH 4 8 F 3 - 16 WTDEPL 4 8 F 3 - 20 WTDEPH 4 8 F 3 - 24 ROCKDEPL 4 8 F 3 - 28 ROCKDEPH 4 8 F 3 - 32 COMPPER 4 8 F 3 - 36 GOTDAT 4 4 I - - An example record- 1 .FALSE. SLOPEL = 4.760 SLOPEH = 11.040 WTDEPL = 3.585 WTDEPH = 4.150 ROCKDEPL = 60.000 ROCKDEPH = 60.000 COMPPER = 100.000 GOTDAT = 1 Valid ranges (MIN- and MAX-) for the items in MUID.COMP: MIN-SLOPEL = 0.000000 MAX-SLOPEL = 64.838997 MIN-SLOPEH = 1.000000 MAX-SLOPEH = 99.000000 MIN-WTDEPL = 0.000000 MAX-WTDEPL = 6.000000 MIN-WTDEPH = 0.000000 MAX-WTDEPH = 7.060000 MIN-ROCKDEPL = 1.067000 MAX-ROCKDEPL = 61.400002 MIN-ROCKDEPH = 5.850000 MAX-ROCKDEPH = 90.809998 MIN-COMPPER = 6.000000 MAX-COMPPER = 100.000000 MIN-GOTDAT = 1.000000 MAX-GOTDAT = 1.000000 The INFO table MUID.KFACT This table contains average values of the soil erodibility factor for each MUID. The soil characteristic is aggregated by soil layer (using the STATSGO LAYER table) and component (using the STATSGO COMP table). The items [and their units of measurement] in the table are: MUID = mapping unit identifier. KFACT = soil erodibility factor. COMPPER = percentage of all components of an MUID used to compute the MUID average value. GOTDAT = a flag indicating that soil data are available for the particular MUID. The table was made with statscdbig.aml, statsmult.aml, layertabone1.f, comptab1.f, multnm.aml, and copytab.aml. Except for multnm.aml, the amls use the input file fnsoils. (See Procedures_Used.) Some important assumptions/decisions/facts- 1. Only soil components with ROCKDEPH > 0 are used. 2. Only soil layers with KFACT > 0 and LAYDEPH > 0 are used. 3. Not all soil components in the COMP table have associated values in the LAYER table. Also, some components are rock outcrops and water, or they can be missing data. These components are not included in the MUID average, and therefore the item COMPPER can be less than 100 percent. 4. Some MUIDs are in the grid but are not in the INFO tables. (This occurs because of missing data in the INFO tables.) When an INFO table is joined to the MUID grid using joinitem, a value of zero will be assigned to attributes associated with MUIDs that occur in the grid but not in the INFO table. After using joinitem, the attribute GOTDAT (with a value of 1) can be used to reselect MUIDs for which there are soil characteristics data. Arc: items MUID.KFACT COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 1 MUID 7 7 C - - 8 KFACT 4 8 F 3 - 12 COMPPER 4 8 F 3 - 16 GOTDAT 4 4 I - - Example records- Record MUID KFACT COMPPER GOTDAT 1 AL001 0.323 100.000 1 2 AL002 0.334 100.000 1 3 AL003 0.267 100.000 1 4 AL004 0.248 100.000 1 5 AL005 0.314 100.000 1 Valid ranges (MIN- and MAX-) for the items in MUID.KFACT: MIN-KFACT = 0.039000 MAX-KFACT = 0.640000 MIN-COMPPER = 1.000000 MAX-COMPPER = 100.000000 MIN-GOTDAT = 1.000000 MAX-GOTDAT = 1.000000 The INFO table MUID.TFACT This table contains average values of the soil loss tolerance factor for each MUID. The soil characteristic is aggregated by soil layer (using the STATSGO LAYER table) and component (using the STATSGO COMP table). The items [and their units of measurement] in the table are: MUID = mapping unit identifier. TFACT = soil loss tolerance factor. COMPPER = percentage of all components of an MUID used to compute the MUID average value. GOTDAT = a flag indicating that soil data are available for the particular MUID. The table was made with statscdbig.aml, statsmult.aml, layertabone1.f, comptab1.f, multnm.aml, and copytab.aml. Except for multnm.aml, the amls use the input file fnsoils. (See Procedures_Used.) Some important assumptions/decisions/facts: 1. Only soil components with ROCKDEPH > 0 are used. 2. Only soil layers with TFACT > 0 and LAYDEPH > 0 are used. 3. Not all soil components in the COMP table have associated values in the LAYER table. Also, some components are rock outcrops and water, or they can be missing data. These components are not included in the MUID average, and therefore the item COMPPER can be less than 100 percent. 4. Some MUIDs are in the grid but are not in the INFO tables. (This occurs because of missing data in the INFO tables.) When an INFO table is joined to the MUID grid using joinitem, a value of zero will be assigned to attributes associated with MUIDs that occur in the grid but not in the INFO table. After using joinitem, the attribute GOTDAT (with a value of 1) can be used to reselect MUIDs for which there are soil characteristics data. Arc: items MUID.TFACT COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 1 MUID 7 7 C - - 8 TFACT 4 8 F 3 - 12 COMPPER 4 8 F 3 - 16 GOTDAT 4 4 I - - Example records- Record MUID TFACT COMPPER GOTDAT 1 AL001 3.720 100.000 1 2 AL002 4.860 100.000 1 3 AL003 4.880 100.000 1 4 AL004 4.270 100.000 1 5 AL005 4.820 100.000 1 Valid ranges (MIN- and MAX-) for the items in MUID.TFACT: MIN-TFACT = 1.000000 MAX-TFACT = 5.000000 MIN-COMPPER = 1.000000 MAX-COMPPER = 100.000000 MIN-GOTDAT = 1.000000 MAX-GOTDAT = 1.000000 The INFO table MUID.WEG This table contains average values of wind erodibility group for each MUID. The soil characteristic is aggregated by soil layer (using the STATSGO LAYER table) and component (using the STATSGO COMP table). The items [and their units of measurement] in the table are: MUID = mapping unit identifier. WEG = wind erodibility group. COMPPER = percentage of all components of an MUID used to compute the MUID average value. GOTDAT = a flag indicating that soil data are available for the particular MUID. The table was made with statscdbig.aml, statsmult.aml, layertabone1.f, comptab1.f, multnm.aml, and copytab.aml. Except for multnm.aml, the amls use the input file fnsoils. (See Procedures_Used.) Some important assumptions/decisions/facts: 1. Only soil components with ROCKDEPH > 0 are used. 2. Only soil layers with WEG > 0 and LAYDEPH > 0 are used. 3. Not all soil components in the COMP have associated values in the LAYER table. Also, some components are rock outcrops and water, or they can be missing data. These components are not included in the MUID average, and therefore the item COMPPER can be less than 100 percent. 4. WEG class 4L was reclassified as class 4. 5. Some MUIDs are in the grid but are not in the INFO tables. (This occurs because of missing data in the INFO tables.) When an INFO table is joined to the MUID grid using joinitem, a value of zero will be assigned to attributes associated with MUIDs that occur in the grid but not in the INFO table. After using joinitem, the attribute GOTDAT (with a value of 1) can be used to reselect MUIDs for which there are soil characteristics data. 6. There is an error in the LAYER table. (See Notes.) Arc: items MUID.WEG COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 1 MUID 7 7 C - - 8 WEG 4 8 F 3 - 12 COMPPER 4 8 F 3 - 16 GOTDAT 4 4 I - - Example records- Record MUID WEG COMPPER GOTDAT 1 AL001 4.458 24.000 1 2 AL002 6.571 28.000 1 3 AL003 5.857 42.000 1 4 AL004 3.000 65.000 1 5 AL005 5.179 28.000 1 Valid ranges (MIN- and MAX-) for the items in MUID.WEG: MIN-WEG = 1.000000 MAX-WEG = 8.000000 MIN-COMPPER = 1.000000 MAX-COMPPER = 100.000000 MIN-GOTDAT = 1.000000 MAX-GOTDAT = 1.000000 See Detailed Description U.S. Geological Survey Ask USGS - Water Webserver Team mailing

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html 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. Export Full grid zipped 1 http://water.usgs.gov/GIS/dsdl/muid.e00.gz Grid Tar file of Arc/INFO grid and associated tables zipped 1 http://water.usgs.gov/GIS/dsdl/muid.tgz None. This dataset is provided by USGS as a public service. 20041108 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+muid FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998