GRASSLinks OCU Version2.5: A PUBLIC ACCESS GIS
GRASSLinks is a World Wide Web
interface to geographic information systems (GIS), offering public
access to spatial information.
GIS are a combination of data,
hardware, and software that allow for complex analysis and querying of
mapped information.
A user need only have a Web browser and access
to the internet to use the spatial database and powerful GIS software
available at the GRASSLinks sites. The aim of GRASSLinks is to provide
a prototype for cooperation and data sharing between environmental
planning agencies, public action groups, citizens, and private
entities.
GRASSLinks was developed by
Susan Huse at REGIS, at the University of California,
Berkeley. GRASSLinks was modified, extended and implemented on
a Linux Workstation by Venkatesh Raghavan at the
Media Center,
of the Osaka City University
The demonstration GIS Database includes maps of geological and
environmental interest for the GRASS Spearfish dataset.
GRASSLinks utilizes the public domain
software,
GRASS, from the GRASS Development Team.
Using GRASSLinks:
Choose one of the options below, then press "Start GRASSLinks"
Display:
Interactively create an image using available maps, colors and regions.
Area tabulation:
Calculate area totals of categories in a map, or overlay two maps
and find the extent of intersection.
Contour:
Generate vector contours from GRASS raster data.
Reclass:
Create a new map by aggregating the information of an existing map.
Combine:
Create a new map that highlights the coincidence (overlap) of
information in two existing maps.
Buffer:
Create a new map by adding concentric rings (buffers) around information in an existing map.
Input Site Data:
Input sitedata using a clickable base map.
Convert site data to GRASS format:
Converts ASCII site data to GRASS site data format.
Surface Interpolation using Raster data:
Generate surface from GRASS site data.
Surface Interpolation using Site data:
Generate surface from rasterized GRASS site data.
VRML Viaualization:
Generate and visualize VRML model using GRASS raster layers.