GIS Data portals

Data and Services Page of the Federal (US) Geographic Data Committee
Gateway of the National Geopatial Data Clearing House
NYS GIS Clearinghouse - NYS FGDC Clearinghouse node for GIS data
GIS Data Depot - On-line data and information
CIESIN - Interactive mapping applications, socioeconomic data.
National Atlas - US National Atlas (raw data dowload)
USGS GEODATA - DLG, DRG, digital maps
Seamless Map - Server from USGS
EPA ENVIROMAPPER - Dynamic query of environmental information
NESDIS - National Environmental, Satellite Data and Information Service
FGDC - Federal Geographic Data Committee - GIS data standards and the National Spatial Data Infrastructure (NSDI)
Spatial Data Infrastructure Links provided by the Glogal Spatial Data Infrastructure Association.

Historical Topographic Maps

MassGIS - Massachusetts Geographic Information System
IWMI - International Water Management Institute Remote Sensing and GIS Archive
GOS - Geospatial One Stop
GIST - Data Repository of the Geographic Information Support Team
Nationalmap - USGS National Map provides public access to high-quality, geospatial data and information from multiple partners

For Satellite Imagery and other Raster:
CGIAR-CSI Consultative Group for International Agriculture Research - Consortium for Spatial Information, with pointers to other Geospatial Services
GLCF - Global Landcover Facility
ESA -  global land cover map

Geonetwork opensource - interactive maps, satellite imagery and related spatial databases.

Free True Marble and Landcover 250m resolution

The Aboriginal Mapping Network

List of WMS servers with public data.

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