A branch of geometry that provides the methods for creating geospatial data of points, lines, and polygons from survey data.
Conversion of geospatial data from one format to another.
A method that uses data froma base station to correct noise errors in GPS data.
Digital line graphs (DLGs)
Digital representaions of point, line, and area features from USGS quadrangle maps including contour lines, spot elevations, hydrography, boundaries, transportation, and U.S. Public Land Survey System.
The process of converting data from analog to digital format.
A table with a built-in electronic mesh that can sense the position of the cursor and can transmit its x-, y-coordinates to the connected computer.
The use of a translator or algorithm in a GIS pachage to directly convert geospatial data from one format to another.
Federal Geographic Data Committee (FGDC)
A U.S. multiagency committee that coordinates the developement of geospatial data standards.
Data that many organizations regularly use for GIS activities.
Geospatial One-Stop (GOS)
A portal established by the Federal Office of Management and Budget for accessing geospatial data.
Global positioning system (GPS) data
Longitude, latitude, and elevation data for point locations made available through a navigational satellite system and a reciever.
Data that provide information about geospatial data.
National Elevation Dataset (NED)
A USGS program that uses a seamless system for delivering 1:24,000 scale DEMs.
National Land Cover Data (NLCD)
Land use/land cover data from the USGS. NLCD 1992 are based on the Thematic Mapper imagery of the early 1990s and NLCD 2001 from the Landsat 7 ETM + imagery.
A public format such as SDTS that can be used for data exchange.
Manual digitizing on the computer monitor by using a data source such as a DOQ as the background.
A digitizing method that converts an analog map into a scanned file in raster format, which can then be converted back to vector format through tracing.
Spatial Data Transfer Standard (SDTS)
Public data formats for tranferring geospatial data such as DLGs and DEMs from the USGS.
SSURGO (Soil Survey Geographic)
A soil database compiled from field mapping at scales from 1:12,000 to 1:63,360 by the Natural Resources Conservation Service of the U.Scu. Department of Agriculture.
STATSGO (State Soil Geographic)
A soil database compiled at 1:250,000 scale by the Natural Resources Conservation Services of the U.S. Department of Agriculture.
TIGER (Topologically Integrated Geographic Encoding and Referencing)
A database prepared by the U.S. Census Bureau that contains legal and statistical area boundaries, which can be linked to the census data.
Vector product format (VPF)
A standard format, structue, and organization for large geographic databases that are based on a georelational data model.
The process of converting raster lines into vector lines through tracing.