Resources for GIS and Spatial Analysis Mike Goodchild

Outline n Data sources n Software sources

Geolibraries n One-stop shops –National Geospatial Data Clearinghouse –Geospatial One-Stop n Integration with GIS –OGC web server specifications –Geography Network

Implications for finding data n Heuristics for the SAP n 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 ||J  F|| / (||J|| ||F||) 1/2

Transitioning map libraries n From central services to unique services –from general collections to special collections –from UCSB's Map and Imagery Laboratory to the Alexandria Digital Library n There will always be more than one service –no amazon.com of geographic information n Unique services must declare themselves –through collection-level metadata (CLM) –formalizing and publishing d

CLM of the Alexandria Digital Library

Knowing where to look n Approaches to CLM –by data type ortho.mit.edu –by area of the globe Arctic Data Directory –the one stop shop –a new generation of search engines identifying footprints

Finding software tools n GIS core functions n ESRI ArcGIS n MapInfo n Idrisi n GRASS n Manifold

GIS extensions n ESRI scripts –Avenue (ArcView 3.x) –AML (ArcInfo <8) –VBA (ArcInfo 8,9) –Python, JScript (ArcInfo 9) –ArcToolbox, ArcScript n Component-ware –COM-compliant software ArcGIS and Excel ArcGIS and Idrisi

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 zone 4 source zones A B C D 10% of A 15% of B 5% of C 50% of D Pop TARGET = 0.10 Pop A Pop B Pop C Pop D

CSISS tool search n n General Google search