Description: Dataset show just the major lakes.
Statewide lakes were assembled from seventeen separate files in the USGS 1:2,000,000 Digital Line Graphs (DLG) dataset and include only those polygons with AREA greater than 20 acres (80940 square meters). Polygons with the attribute MIN = 100 or arcs with the attribute LINECODE = 'L' are valid lakes. For data codes and details, please refer to the US Geological Survey Circular 895, 1982.
Due to the limitation of ARC/INFO software at the time of processing these files, the lakes were originally processed into three groups. Then a framework of arcs surrounding those three groups allowed all the lakes to be united into one statewide lakes coverage. Any lakes which were interested either by the boundaries of the seventeen original DLG files or by DNR's framwork were then edgematched and coded as one lake.
Purpose:
The purpose for this layer is for mapping lakes at no larger than 1:2,000,000. Because of this scale, lakes smaller than 20 acres were removed.
Description: Statewide lakes were assembled from seventeen separate files in the USGS 1:2,000,000 Digital Line Graphs (DLG) dataset and include only those polygons with AREA greater than 20 acres (80940 square meters). Polygons with the attribute MIN = 100 or arcs with the attribute LINECODE = 'L' are valid lakes. For data codes and details, please refer to the US Geological Survey Circular 895, 1982.
Due to the limitation of ARC/INFO software at the time of processing these files, the lakes were originally processed into three groups. Then a framework of arcs surrounding those three groups allowed all the lakes to be united into one statewide lakes coverage. Any lakes which were interested either by the boundaries of the seventeen original DLG files or by DNR's framwork were then edgematched and coded as one lake.
Purpose:
The purpose for this layer is for mapping lakes at no larger than 1:2,000,000. Because of this scale, lakes smaller than 20 acres were removed.
Description: 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.
Purpose:
The purpose of this coverage is to map the major streams without the burden of reselecting or mapping all other streams. Though the resolution is 1:2,000,000, it is ideal for general river reference for mapping 8.5" x 11" maps of the state; The user should reselect for hierarchy = "1" for this scale of mapping.
Service Item Id: 27a7c328b4de4f13ab942e3c7f33a82a
Copyright Text: USGS 1:2,000,000 Digital Line Graphs
Description: This is a first cut at a statewide 1:63,360 coastline. The entire coasline, however, is not 1:63.360; only where data was available as of January 1998. It is a mixture of sources ranging from the Department of Natural Resources, Land Records Information Section hydrography database to the Exxon Valdez Oil Spill Environmentally Sensitive Index coastline (no ESI attributes included) to the US Geologic Survey hydrography to US Forest Service (in Prince William Sound). Where the 1:63,360 data was unavailable the 1:250,000 coastline was used to fill in.
This information does not include lakes or streams. All streams are cut off at the mouth with a straight line.
Purpose:
The purpose of this information is to provide a better coastline for land data to be clipped. It's purpose is cartographic. Before this was created, land data was clipped to a 1:250,000 statewide coastline which did not include many of the islands and did not match well with the 1:63,360 hydrography. Attributes have been added to the arcs, but have not been checked carefully.
This coverage is the first of its kind at this scale; thus there are errors. Please notify DNR, LRIS so these may be corrected.
Note: The USGS is in the process of automating the hydrography statewide at 1:63,360 and should be used as a replacement when the information is ready. This hydrography was not complete and available as of January 1998, and no specific date was set.
Description: This coastline coverage of Alaska represents a collective effort by many organizations over the course of the last 15 years. It began as a digital pen-up-pen-down file from the Department of Natural Resources Division of Oil & Gas and was generated into an ARC coverage by the North Slope Borough. At that point several agencies -- spearheaded by NOAA -- cooperated to have the remainder of the coastline digitized at the scale of 1:250000. Ninety percent of the features in the coverage are very close to the Alaska coastline because NOAA had no interest in covering the whole state with stream and lake information at the original time of data capture.
Our version of the Alaska coastline originated with the North Slope Borough who gave this coverage to EROS on 3-7-89. At EROS many edits and improvements were made to the coastline coverage. The State of Alaska Department of Natural Resources received this edited coverage from EROS on 7-29-92 and has continued to make cartographic improvements to the coverage.
Purpose:
For typical GIS purposes of a general coastline. Do not use for navigation.
Supplemental_Information:
Revisions:
Among the most notable corrections made by DNR:
1) placement of the Copper River (July 1992)
2) coding changes for Baird Inlet -- Selawik Lake (July 1993)
3) deletion of extraneous islands in the Aleutians
4) repositioning US/Canadian border to 141 degrees west longitude (January 1994)
5) coding changes for Walapka Bay (February 1994)
6) coding changes for Selawik Lake and coastline near Wainwright (June July August 1994)
Description: The Alaska Department of Natural Resources (ADNR) has combined hypsography for several Digital Chart of the World (DCW) tiles into one coverage. Some edits to the data were made, which allowed ADNR to label high elevation points and mountain tops from the DCW data. The coverage contains elevation contours at every 1,000 feet. The hypsography used for statewide map products is often depicted as a contour line at every 3,000 feet, which offers visualization of vertical control as it relates to the other map features.
The hypsography data were combined from the HYPOINT and HYNET coverages comprising the following 5 degree by 5 degree tiles for Alaska: AK 12,22,23,32,33; AL 21,31,32; BK 12,13,22,23,33; BL 11,12,13,21,22,23,31,32,33; CK 12,23,33; CL 11,12,13,21,22,23,31; DK 12,13,22,23; and ZK 22,32.
Please note: Portions of this product include intellectual property of ESRI and are used herein with permission. Copyright (c) 1992 Environmental Systems Research Institute, Inc. All rights reserved. http://www.asgdc.state.ak.us/homehtml/esri.htm License Agreement
Purpose: ANDR's purpose for modifying this information was for mapping a physical base at 1:1,000,000.
Service Item Id: 27a7c328b4de4f13ab942e3c7f33a82a
Copyright Text: Environmental Systems Research Institute, Inc., and ADNR