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 - free GeoCommunity - free Tele Atlas North America - pay Road network database Digital Globe -pay High resolution imagery

Federal Data Sources (public data) Geospatial One-Stop Nationwide public data U.S. Geological Survey Biological, geologic, water, DEM, topographic, land cover, cultural base maps U.S. Census Bureau Census boundaries

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 catalog GIS 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 activities Access to data and information Watershed community data accessible from web site

Data Sources for California Seafloor Mapping Lab CSUMB 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 CCJDC Central 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 Data GPS 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