Resources for GIS and Spatial AnalysisResources for GIS and Spatial Analysis

Mike Goodchild

OutlineOutline

Data sources Software sources

GeolibrariesGeolibraries

One-stop shops– National Geospatial Data Clearinghouse

• http://nsdi.usgs.gov/

– Geospatial One-Stop• http://www.geodata.gov/

Integration with GIS– OGC web server specifications– Geography Network

Implications for finding dataImplications for finding data

Heuristics for the SAP Geographic information is most likely to

be found on a server located within its footprint– convergence of d and s– but at what level in the hierarchy?

• jurisdiction that most closely matches the footprint

• max ||JF|| / (||J|| ||F||)1/2

Transitioning map librariesTransitioning map libraries

From central services to unique services– from general collections to special collections– from UCSB's Map and Imagery Laboratory to the

Alexandria Digital Library There will always be more than one service

– no amazon.com of geographic information• www.alexandria.ucsb.edu• www.geographynetwork.com• www.fgdc.gov

Unique services must declare themselves– through collection-level metadata (CLM)– formalizing and publishing d

CLM of the Alexandria Digital Library

Knowing where to lookKnowing where to look

Approaches to CLM– by data type

• ortho.mit.edu

– by area of the globe• Arctic Data Directory

– the one stop shop• www.fgdc.gov

– a new generation of search engines• identifying footprints

Finding software toolsFinding software tools

GIS core functions ESRI ArcGIS MapInfo Idrisi GRASS Manifold

GIS extensionsGIS extensions

ESRI scripts– Avenue (ArcView 3.x)– AML (ArcInfo <8)– VBA (ArcInfo 8,9)– Python, JScript (ArcInfo 9)– ArcToolbox, ArcScript

Component-ware– COM-compliant software

• ArcGIS and Excel• ArcGIS and Idrisi

Example (areal interpolation)Example (areal interpolation)

‘Pass Excel the U column vector (source values) While Not pFeat Is Nothing       pRow = Call GetRow(pFeat.Value(0)) ‘GetRow is user-defined function       pCol = "A"       zValue = pFeat.Value(zValueIndex)       Sheets("Sheet2").Select 'Store vector on Sheet 2 in Column A       Range(pCol & pRow).Select       Selection.R1C1 = zValue       Set pFeat = pCursor.NextFeature   Wend

M.J. Ungerer and M.F. Goodchild (2002) Integrating spatial data analysis and GIS: a new implementation using the Component Object Model (COM). International Journal of Geographical Information Science 16(1): 41–54.

1 target zone4 source zones

AB

C

D

10% of A

15% of B

5% of C

50% of D

PopTARGET = 0.10 PopA + 0.15 PopB + 0.05 PopC + 0.50 PopD

CSISS tool searchCSISS tool search

http://www.csiss.org General Google search