This data set includes maps of permafrost extent, permafrost temperature, the permafrost boundary, and ground ice thickness for all of Russia. The maps are ESRI Shapefiles, which were digitized from paper maps taken from the World Atlas of Snow and Ice Resources, 1997, Institute of Geography, Russian Academy of Sciences, Moscow, Russia. The scale of the source maps range from 1:20,000,000 to 1:40,000,000. Polygons were assigned attributes based on the classes used in the legends of the paper map..
For general information on Russian permafrost and ground ice, read the Description of Russian Permafrost.
These data were extracted from a larger collection entitled Land Resources of Russia. Data and documentation © 2002 copyright International Institute for Applied Systems Analysis and the Russian Academy of Sciences.
Kotlyakov, V. and T. Khromova. 2002. Maps of permafrost and ground ice. In Stolbovoi V. and I. McCallum, eds. Land Resources of Russia. Laxenburg, Austria: International Institute for Applied Systems Analysis and the Russian Academy of Science. CD-ROM. Distributed by the National Snow and Ice Data Center, Boulder.
|data format||tarred and compressed package of ESRI Shapefiles|
|spatial coverage and resolution||Russia. Digitized from paper source maps with scales ranging from 1:20,000,000 to 1:40,000,000.|
|grid type and size||Lambert Azimuthal projection|
|file naming convention||ggd600_permbnd_russia.dbf
|file size||largest file 964 KB uncompressed|
|parameter(s)||permafrost extent, permafrost temperature, ground ice thickness|
|procedures for obtaining data||data are available via ftp|
Dr. in Geography, Member of the Russian Academy of Sciences
Institute of Geography
Russian Academy of Sciences.
Institute of Geography
Russian Academy of Sciences
Data are ESRI Shapefiles, converted from Arc/Info e00 files using the ARCSHAPE command. The Shapefiles are most easily imported into ESRI's ArcView, but most other GIS packages can import ESRI Shapefiles. ESRI also provides a free basic GIS package, ArcExplorer, on the ESRI web site.
Each Shapefile consists of three files: filename.dbf (attribute data), filename.shp (feature geometry) and filename.shx (feature geometry index). In all cases the cover# and cover-id field names were shortened to conform to the 10-character field name width limit for dBase files .dbf.
File names are
Following is a quick tutorial for defining the projection of this data set in ArcGIS. These steps were tested with ArcGIS 9:
1. Open ArcToolbox. Select Data Management Tools --> Projections and Transformations --> Define Projection.
2. In the Define Projection window, select an input shapefile for the "Input Dataset or Feature Class" field. The "Coordinate System" field now says "Unknown." Click the icon to the right of the "Coordinate System" field.
3. In the Spatial Reference Properties window that appears, click Select to select a predefined coordinate system. Click Projected Coordinate Systems --> Polar. Select North Pole Lambert Azimuthal Equal Area.prj. Click Add.
4. Back in the Spatial Reference Properties window, click Modify. Change the parameters to the following:
Leave the "Linear Unit" as meters. In the "Geographic Coordinate System" section, click Modify. For "Datum" and "Spheroid" select <custom>. For "Semimajor axis" and "Semiminor axis" enter 6370997.24063. Click OK until the Define Projection wizard runs. The shapefiles are now projected.
Note: the Land Resources of Russia site defines the projection parameters as follows, for those who use the "projectdefine" Arc command:
Projection: Lambert Azimuthal
6370997.24063 (radius of the sphere of reference)
100 0 0.000 (longitude of center of projection)
45 0 0.000 (latitude of center of projection)
0.00000 (false easting (meters))
0.00000 (false northing (meters))
While all spatial datasets on the "Land Resources of Russia" CD are stored in the Lambert Azimuthal projection, differences occur between the coverages in terms of resolution and scale. In particular, the outer boundary of Russia, islands, and water bodies may vary between data sets.
13 September 2002
24 January 2005