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