USDA Forest Service
Tongass National Forest Landslides
FISCAL 2011: Inventory: "2011 fiscal yr additions and edits, Tongass Soil Scientists" Including landslides added by Becki Saari from Big Thorne analysis area, landslides added by Jacquie Foss from Sitka, Petersburg, Juneau, and Hoonah Ranger Districts, and landslides added or edited by Darin Silkworth from Ketchikan-Misty Fiords Ranger District and Inventory: "Soil Survey, unconfirmed" Landslides added by Darin Silkworth from the soil layer from the southern two thirds of the forest but unconfirmed as to meeting criteria used for inclusion in the landslide layer. These landslides are tentative pending interpretive confirmation. and Inventory: "Soil Survey, confirmed" Landslides added by Darin Silkworth from the soil layer from the southern two thirds of the forest and confirmed as to meeting criteria used for inclusion in the landslide layer. Added fields "LANDSLIDENAME", "PREDCOVER", "COVERSPP", "COVERPERCENT", "EXAMINER", "LATESTYEARNOTSEEN", and "FIRSTYEARSEEN" FISCAL 2010: Inventory "2010 Additions, Darin Silkworth" Landslides added on POW, primarily from CRD from 1985, 1997, 2005, and 2006 photography. Landslides added and previously added landslides updated using 1971 photography on POW (incomplete update: from flight lines 34 to 53 only). Started the population/conversion of CONFIDDAT and YRINTTYP to conform with the Data Dictionary (see Suplemental Information). Reinterpreted VEGCLASS for existing landslides on POW using 2006 photography, if available (YRINTTYP changed to 2006P). Landslide identified on earlier inventories need additional interpretive work using both older (1971 and older) and most recent (currently 2006) photography to update landslide dates (CONFIDDAT and YROCCURANCE). April 2009: Landslides added from Dennis Landwehr's 1993 to 1995 inventories on Thorne Bay RD. Domains added to some attributes. Attribute TNFLSID deleted. Attribute TNFLSNO repopulated assigning a sequential and unique number to all landslides. Attribute YR_OCCURANCE populated for all landslides. See Supplemental Information. February 2007: Version two of the Tongass national Forest Landslide Layer. This project was initiated in 2001 and as yet is incomplete. To date approximately 3 million acres have been mapped. Landslides were identified from the most recent photography and digitizerd on screen. Attributes are defined in the data dictionary and in Entity Attribute. This data set is in Geodatabase form and includes Prince of Wales Landslide mapping . Latest version includes landslides delineated in 2005 from Hoonah.
Data and Resources