Theme: Timber Type
Data Theme Name:  TIMTYP
Coverage Pathname/Name(s):  /fsfiles/ref/library/gis/chugach/timtyp
Coverage Type:  Polygon
Coverage Geographic Extent:  Chugach NF (Forest-wide, excluding ANILCA additions)
Source Media/Scale:  Mylar & 1:15840 aerial photography
Manuscript Media/Scale:  1:31,680
Date of Source Data:  1950's - 1970's
Date of most recent update:  12/04/97
Source Agency/Organization:  Chugach NF
Digitization Method:  Chugach NF staff using LIDES, ARC/INFO, or under contract with the North Slope Borough and the Brodie Group
Cell Size or Minimum Mapping Unit:  5 acres by contract, though many polygons were manuscripted at less than 5 acres
Last Update/Maintenance Schedule:  1/93 
Known Problems, Technical Limitations, or Constraints (Accuracy):  ANILCA additions were not mapped, some inconsistencies in mapping
from area to area.  Errors in typing such as no cedar being designated
Remarks:  Existing timber type mylars were developed by the Alaska Regional Office in 1978 using 1:15,840 aerial photography flown
in the 1950's-1970's, and digitized primarily under contract.  The North Slope Borough digitized the Big Islands and Gravina
Management Areas.  Other full quads were done primarily by the Brodie Group.  The remaining quads were done by the Chugach NF staff
using LIDES or ARC/INFO.  Additional mapping was done by Bob Green for the BLM Window and Whittier.  Warren Oja did mapping for
Cooper Landing.  The forty quads under contract were as follows:  Anchorage A1-A4, Bering Glacier A8 & B8, Cordova A1-A2, Cordova
B1-B5, Cordova C3-C4, Middleton Island D1/2, Seward A3-A4, Seward B2-B8, Seward C1-C8, Seward D1-D5, Seward D7-D8.  

                                       <><><><>  Data File and Item Definitions  <><><><>

Theme       File Description           Item           Re- BEG WI O- TY DE ALT     Item Description
Name        ---------------            -----          DEF COL DE WI PE CI Name    ----------------

TIMTYP      Timber Type                AREA                1   8 18  F  5         Polygon Area in Square Meters
                                       PERIMETER           9   8 18  F  5         Distance Around the Polygon in Meters
            Page 1 of 4                TIMTYP#            17   4  5  B  0         Coverage Feature Number - System Generated
                                       TIMTYP-ID          21   4  5  B  0         Coverage Feature ID - System Generated
                                    ============ THEME SPECIFIC INFORMATION FOLLOWS ============
                                       TT-CODE            25  15 15  C  0         Numeric Code for Spp. and Stand Characteristics
                                       COND-CODE       R  25   1  1  C  0 COND    Condition Class Code (Column 1 of TT-CODE)
                                                                                    Valid Codes:
                                                                                      0 = No Condition Class Code
                                                                                      1 = Residual Stand (R)
                                                                                      9 = No Data
                                       NFOR-CODE       R  26   2  2  C  0 NFOR    Nonforest Class Code (Columns 2-3 of TT-CODE)
                                                                                    Valid Codes:
                                                                                      00 = No Nonforest Class Code
                                                                                      01 = Natural Grassland - NfG
                                                                                      02 = Alpine High Meadow - NfH
                                                                                      03 = Muskeg Meadow - NfM
                                                                                      04 = Rock - NfR
                                                                                      05 = Icefield or Snowfield - NfI
                                                                                      06 = Urban, Agriculture, Other - NfU
                                                                                      07 = Recurrent Snow Slide Zone - NfS
                                                                                      08 = Mass Wasting - NfW
                                                                                      09 = Sand Dunes - NfD
                                                                                      10 = Alder - NfA
                                                                                      11 = Willow - NfT
                                                                                      12 = Other Brush - NfB
                                                                                      13 = Uplifted Beach - NfL
 

                                       <><><><>  Data File and Item Definitions  <><><><>

Theme       File Description           Item           Re- BEG WI O- TY DE ALT     Item Description
Name        ---------------            -----          DEF COL DE WI PE CI Name    ----------------

TIMTYP      Timber Type                                                               14 = River Fill - NfF
                                                                                      15 = Other Causes - NfO
            Page 2 of 4                                                               16 = Borrow Pit - BP
                                                                                      17 = Water - W
                                                                                      99 = No Data
                                       OVST-CODE       R  28   1  1  C  0 OVST    Nonforest (Incidental) Overstory Species Code
                                                                                    Valid Codes:
                                                                                      0 = No Overstory Species Code
                                                                                      1 = Spruce - (S)
                                                                                      2 = Hemlock - (H)
                                                                                      3 = Cottonwood - (P) or (C)
                                                                                      4 = White Spruce - (W)
                                                                                      5 = Cottonwood-White Spruce - (PW)
                                                                                      6 = Hemlock-White Spruce - (HW)
                                                                                      7 = Birch - (B)
                                                                                      8 = Aspen - (Q)
                                                                                      9 = Black Spruce - (M)
                                       UNPR-CODE       R  29   2  2  C  0 UNPR    Unproductive Forest Code (Columns 5-6 of TT-CODE)
                                                                                    Valid Codes:
                                                                                      00 = No Unproductive Forest Code
                                                                                      01 = Rock - ScR
                                                                                      02 = Low Site - ScL
                                                                                      03 = Muskeg Forest - ScM
                                                                                      04 = High Elevation (Alpine) - ScH
                                                                                      05 = Recurrent Snow Slide - ScS
                                                                                      06 = Alder - ScA
                                                                                      07 = Willow - ScT
                                                                                      99 = No Data
                                       FTYP-CODE       R  31   2  2  C  0 FTYP    Forest Cover Type Code (Columns 7-8 of TT-CODE)
                                                                                    Valid Codes:
                                                                                      00 = No Forest Cover Type Code
                                                                                      01 = Hemlock - H
                                                                                      02 = Sitka Spruce - S
                                                                                      03 = White Spruce - W
                                                                                      04 = Black Spruce - M
                                                                                      05 = Birch - B
                                                                                      06 = Aspen - Q
                                                                                      07 = Cottonwood-Balsam Poplar - P
                                                                                      08 = Hemlock-Sitka Spruce - HS
                                                                                      09 = Hemlock-White Spruce - HW
                                                                                      10 = Aspen-White Spruce - QW
                                                                                      11 = Birch-White Spruce - BW
                                                                                      12 = Cottonwood-Sitka Spruce - PS
                                                                                      13 = Cottonwood-White Spruce - PW
                                                                                      14 = Cottonwood-Birch - PB
                                                                                      15 = Cottonwood-Birch-White Spruce - PBW
                                                                                      16 = Aspen-Hemlock - QH

                                       <><><><>  Data File and Item Definitions  <><><><>

Theme       File Description           Item           Re- BEG WI O- TY DE ALT     Item Description
Name        ---------------            -----          DEF COL DE WI PE CI Name    ----------------

TIMTYP      Timber Type                                                               17 = Aspen-Birch - BQ
                                                                                      18 = Birch-Sitka Spruce - BS
            Page 3 of 4                                                               19 = Birch-Hemlock - BH
                                                                                      99 = No Data
                                       STCL-CODE       R  33   1  1  C  0 STCL    Stand Size Class Code (Column 9 of TT-CODE)
                                                                                    Valid Codes:
                                                                                      0 = No Stand Size Class Code
                                                                                      1 = Seedling and Sapling
                                                                                      2 = Poletimber
                                                                                      3 = Young-Growth Sawtimber
                                                                                      4 = Old-Growth Sawtimber
                                                                                      9 = No Data
                                       DENS-CODE       R  34   1  1  C  0 DENS    Stand Density Code (Column 10 of TT-CODE)
                                                                                    Valid Codes for all Stand Classes:
                                                                                      0 = No Stand Density Code
                                                                                      9 = No Data
                                                                                    Valid Codes for Stand Class 1:
                                                                                      1 = Understocked - (u)
                                                                                      2 = Satisfactorily Stocked - (m)
                                                                                      3 = Overstocked - (o)
                                                                                    Valid Codes for Stand Classes 2-4:
                                                                                      4 = Poorly Stocked - (p)
                                                                                      5 = Medium Stocked - (m)
                                                                                      6 = Well Stocked - (w)
                                       VOCL-CODE       R  35   1  1  C  0 VOCL    Volume Class Code (Column 11 of TT-CODE)
                                                                                    Valid Codes:
                                                                                      0 = No Volume Class Code
                                                                                      1 = 0-999 Net Cubic Feet
                                                                                      2 = 1,000-2,499 Net Cubic Feet
                                                                                      3 = 2,500-4,999 Net Cubic Feet
                                                                                      4 = 5,000-7,499 Net Cubic Feet
                                                                                      5 = 7,500-9,999 Net Cubic Feet
                                                                                      6 = 10,000+ Net Cubic Feet
                                                                                      9 = No Data
                                       DECD-CODE       R  36   1  1  C  0 DECD    Decadence Rating Code (Column 12 of TT-CODE)
                                                                                    Valid Codes:
                                                                                      0 = No Decadence Rating Code
                                                                                      1 = Low Risk (Oldgrowth Sawtimber) - L
                                                                                      2 = High Risk (Oldgrowth Sawtimber) - H
                                                                                      3 = Insects - I
                                                                                      4 = Windthrow - W
                                                                                      5 = Overmature (Unprod. Forest Low Site) - M
                                                                                      9 = No Data
                                       UNST-CODE       R  37   1  1  C  0 UNST    Understory Vegetation Code (Column 13 of TT-CODE)
                                                                                    Valid Codes:
                                                                                      0 = No Understory Vegetation Code
                                                                                      1 = Spruce Seedling/Sapling - S1
                                                                                      2 = Spruce Poletimber - S2
                                                                                      3 = Spruce Young-Growth Sawtimber - S3
                                                                                      4 = Alder Understory - a

                                       <><><><>  Data File and Item Definitions  <><><><>

Theme       File Description           Item           Re- BEG WI O- TY DE ALT     Item Description
Name        ---------------            -----          DEF COL DE WI PE CI Name    ----------------

TIMTYP      Timber Type                                                               5 = Grass Understory - g
                                                                                      6 = Willow Understory - t
            Page 4 of 4                                                               9 = No Data
                                       NONS-CODE       R  38   2  2  C  0 NONS    Current Nonstocked Condition Code (Columns 14-15)
                                                                                    Valid Codes:
                                                                                      00 = No Nonstocked Condition Code
                                                                                      01 = Logging Less Than 5 Years Old - X
                                                                                      02 = Logging 5 or More Years Old - NX
                                                                                      04 = Water or Glacier Action - NG
                                                                                      05 = Slides - NS
                                                                                      07 = Windthrow - WT
                                                                                      08 = Beach Uplifting - NU
                                                                                      09 = River Fill - NR
                                                                                      10 = Alder - NA
                                                                                      12 = Other Causes - NO
                                                                                      99 = No Data