The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) Database (MTDB). The MTDB represents a seamless national file with no overlaps or gaps between parts, however, each TIGER/Line shapefile is designed to stand alone as an independent data set, or they can be combined to cover the entire nation. The Feature Names Relationship File (FEATNAMES.dbf) contains a record for each feature name and any attributes associated with it. Each feature name can be linked to the corresponding edges that make up that feature in the All Lines Shapefile (EDGES.shp), where applicable to the corresponding address range or ranges in the Address Ranges Relationship File (ADDR.dbf), or to both files. Although this file includes feature names for all linear features, not just road features, the primary purpose of this relationship file is to identify all street names associated with each address range. An edge can have several feature names; an address range located on an edge can be associated with one or any combination of the available feature names (an address range can be linked to multiple feature names). The address range is identified by the address range identifier (ARID) attribute, which can be used to link to the Address Ranges Relationship File (ADDR.dbf). The linear feature is identified by the linear feature identifier (LINEARID) attribute, which can be used to relate the address range back to the name attributes of the feature in the Feature Names Relationship File or to the feature record in the Primary Roads, Primary and Secondary Roads, or All Roads Shapefiles. The edge to which a feature name applies can be determined by linking the feature name record to the All Lines Shapefile (EDGES.shp) using the permanent edge identifier (TLID) attribute. The address range identifier(s) (ARID) for a specific linear feature can be found by using the linear feature identifier (LINEARID) from the Feature Names Relationship File (FEATNAMES.dbf) through the Address Range / Feature Name Relationship File (ADDRFN.dbf).

Yukon Flats National Wildlife Refuge (YKF NWR) and Koyukuk NWR (KUK NWR), U.S. Fish and Wildlife Service (USFWS), initiated a project with the U.S. Geological Survey Earth Resources Observation and Science (EROS) Center to acquire map products needed for moose habitat assessment. The objective of this work was to create a suite of products which included: Estimated Vegetation Heights, probability of Willow Estimates, and Vegetation Type Maps. These products are based on spectral characteristics found in bands 2 through 7 of Landsat 8 OLI scenes processed to surface reflectance, acquired in summer of 2013, and late winter of 2014. Training data was collected by fixed wing aircraft and helicopter by USFWS refuge staff, and extrapolated by the methods described. This project, “ Yukon Flats NWR willow mapping” (PI: Delia Vargas Kretsinger) was funded through the USFWS Inventory and Monitoring program via an Interagency Agreement between the USGS EROS and the USFWS – Alaska Regional Office. The data products are provisional in nature and are intended to support USFWS land management decisions. These data have not been validated with independent test data but received favorable qualitative assessment by local field experts.

This dataset depicts the terrestrial boundaries of the Landscape Conservation Cooperatives (LCC) within Alaska. Those LCCs are: Aleutian and Bering Sea Islands, Arctic, North Pacific, Northwest Boreal, and Western Alaska. These boundaries are derived from the master LCC Boundary dataset maintained by USFWS, but portions of these polygons have been modified. The specific modification are listed below: ARCTIC LCC: Portions of the polygon were edited to more closely match the coastline and the boundary was also edited to include the Colville River. WESTERN ALASKA LCC: Nulato Hills expansion: There are a number of reasons why the boundary of the Western Alaska LCC (WALCC) was modified to include the Nulato Hills Ecoregion. First, this Ecoregion is a transitional zone that fits equally well within either the WALCC or the Northwest Boreal LCC. Also, the Nulato Hills are the primary land route linking the northern and southern portions of the WALCC and as such, will likely serve as a conduit allowing species to migrate north from more southern portions of the LCC. Finally, including the Nulato Hills as part of WALCC was advantageous because it encouraged close coordination among stakeholders involved in establishing the LCC and completion of the Bureau of Land Managements Seward Peninsula-Nulato Hills-Kotzebue Lowlands Rapid Ecoregional Assessment. Lake Clark expansion: The south central portion of the WALCC was modified so that it included all the watersheds that flow into Bristol Bay. Yukon River drainage contraction: The villages of Koyukuk, Nulato, Kaltag, Grayling, Anvik, and Holy Cross are including within the NWBLCC. These Athabascan communities have more cultural similarities to other villages within the NWBLCC, and are represented by the Alaska Native non-governmental organization, Tanana Chiefs Conference, which participates in the NWBLCC LCC partnership community. The final boundary in the Nulato Hills area was placed at the hydrological divide between the Norton Sound and the tributaries of the Yukon and Koyukuk Rivers. This is a logical division from a geographic and ecological perspective, particularly with respect to the fisheries resources and the terrestrial vegetation types of the area. NORTHWEST BOREAL LCC: Nulato Hills contraction: Portions of the Nulato Hills art of the Lime Hills ecorgeion were removed. Yukon River drainage expansion: The villages of Koyukuk, Nulato, Kaltag, Grayling, Anvik, and Holy Cross are including within the NWBLCC. These Athabascan communities have more cultural similarities to other villages within the NWBLCC, and are represented by the Alaska Native non-governmental organization, Tanana Chiefs Conference, which participates in the NWBLCC partnership community. The final boundary in the Nulato Hills area was placed at the hydrological divide between the Norton Sound and the tributaries of the Yukon and Koyukuk Rivers. This is a logical division from a geographic and ecological perspective, particularly with respect to the fisheries resources and the terrestrial vegetation types of the area. Lake Clark contraction: The southwest portion of the LCC was modified so that all the watersheds that flow into Bristol Bay now belong to WALCC.

Selected major rivers were extracted from all rivers and streams in the USGS 1:2,000,000 Digital Line Graphs (DLG) dataset. The major rivers include the Copper, Susitna, Kuskokwim, Yukon, Koyukuk, Kobuk, Noatak, and Colville Rivers. Set these rivers to the hierarchy attribute to "1". To access the complete statewide DLG dataset, refer to the "Rivers, 1:2,000,000" metadata. New to this coverage is a second hierarchical level of streams. These streams were pulled from the 1995 navigability coverage. This coverage, however, does not represent which streams are considered navigable by the state. The second hierarchy was added for cartographic purposes only - to provide a more complete river drainage layer on statewide maps.