GIS data sources

Data capture and compilation is very time consuming and costly

Up to 80% cost of a GIS (Longley et al.)

Primary Data – data captured specifically for use in GIS

•Remote sensing (satellite image, LIDAR, multibeam survey), GPS, digital aerial photographs

Secondary Data - data reused from earlier sources -

•DEMS from topographic map contours, scanned paper maps

Commercial Sources

ESRI Geography Network - freehttp://www.geographynetwork.com/data/index.htmlGeoCommunity - freehttp://www.geocomm.com/

Tele Atlas North America - payRoad network database

Digital Globe -payHigh resolution imagery

Federal Data Sources (public data)

Geospatial One-Stop http://www.geodata.gov/ Nationwide public data

U.S. Geological Survey Biological, geologic, water, DEM,

topographic, land cover, cultural base maps http://seamless.usgs.gov/

U.S. Census Bureau Census boundaries http://www.census.gov/geo/www/index.html

Data Sources for California

CEIC – California Environmental Information Catalog

CaSIL – California Spatial Information Library

CA Watershed Portal

Seafloor Mapping Lab (CSUMB)

Data Sources for California

CEIC California Environmental Information Catalog (aka CERES metadata catalog)

web based catalogGIS data, EIR, General Plans, Administrative reports

stores metadata – not the actual data

Over 250 participants from federal, state, local, academic, private industry

Data Sources for California

CaSIL – California Spatial Information Library

common statewide GIS data

roads, administrative boundaries, counties, imagery, topographic maps

data accessible from web site

Data Sources for California

CA Watershed Portal

Watershed activitiesAccess to data and information Watershed community

data accessible from web site

Data Sources for California

Seafloor Mapping LabCSUMB

Nearshore Marine Data

Acoustic Remote Sensing Multibeam Bathymetry Backscatter, Side Scan Sonar Geologic and Substrate Interpretation

data accessible from web site

Data Sources for California

CCJDCCentral Coast Joint Data Committee

Association of Monterey Bay Area Government

Regional GIS data sharing group (San Mateo, Santa Cruz, San Benito, Monterey)

Local resource of GIS activities and data

Creating New Data

Field DataGPS positions Survey (distance, direction, elevation) primarily for defining parcel boundaries

Text Files – x,y coordinates (weather stations, earthquake epicenter)

Digitizing - create new vector features

Scanning - convert paper maps to raster of vector file