2009 Ohio River Basin Landcover Comparison
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2009 Ohio River Basin Landcover Comparison

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Presentation given at 2009 Ohio Floodplain Managers Conference and Poster displayed at Hanover College Rivers Institute Conference

Presentation given at 2009 Ohio Floodplain Managers Conference and Poster displayed at Hanover College Rivers Institute Conference

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    2009 Ohio River Basin Landcover Comparison 2009 Ohio River Basin Landcover Comparison Presentation Transcript

    • Huntington DistrictLand Cover Comparison Using GIS …...and lots of SQLJoe Trimboli, MS, CFMCommunity PlannerHuntington District17 August 2009US Army Corps of EngineersBUILDING STRONG®
    • Huntington District Land Cover ComparisonNeed for Comparison  Ohio River Basin Comprehensive Report Study (ORBCRS)  www.orboutreach.com
    • Huntington District
    • Huntington District Land Cover Comparison GoalsIdentifies land use changes in the Ohio River BasinIncorporate map set into MapRecon portion of study  Create access table that links to HUC8 watershed for map creation  Create map for each land cover classification
    • Huntington District DataSources  National Land Cover Datasets of 1992 and 2001  Downloaded from USGS  Used seamless server  Template Selection  Best meta data available  USGS Watershed Layer (CORPSMAP)  CorpsMap is the USACE nationwide enterprise GIS implementation  Data source for many federal agencies
    • Huntington District Data Preparation Created mosaic raster layer using ArcMap 9.2 for each data set, 1992 and 2001 (6 template areas) Created raster of HUC8 watersheds Insured all raster’s had same projection  Matched land cover projection  Converted HUC8 data to match land cover data Insured all rasters had same cell size  Defined HUC8 raster layer to match land cover cell size
    • Huntington District HUC8 raster file reprojected and with matching cell size to land cover layers
    • Huntington District Process Verification Used various processes Evaluated data numerous times Different tools Different ways  Model Creation  Spatial Analyst Tools > Combine
    • Huntington District Model creation proved to be awkward and time consuming based on existing knowledge
    • Huntington District Found Combine tool while researching process
    • Huntington District Combine Creates new raster layer Combines multiple layers  Intersecting raster cell values Creates Discrete properties table NOT Floating Point
    • Huntington District Adds columns in attribute table that correspond to each raster layer
    • Huntington District Data Check: Identify point on map Open Attributes Table Scroll to matching pixel value Verify layers and column names
    • Huntington District Export all attribute tables to Microsoft Access
    • Huntington District Microsoft Access (SQL) Format of Personnel Geospatial Database Manipulates tables Ability to create and manipulate data  Non-spatial Tables  Creation custom queries
    • Huntington DistrictTables
    • Huntington District Land Cover Comparison GoalsIdentifies land use changes in the Ohio River BasinIncorporate map set into MapRecon portion of study  Create access table that links to HUC8 watershed for map creation  Create map for each land cover classification
    • Huntington DistrictComparable Study
    • Huntington DistrictUSGS Data Research
    • Huntington DistrictNLCD 1992-2001 Anderson Level I Cross-walk Table
    • Huntington DistrictCrosswalk Table Creation
    • Huntington DistrictOriginal Class Values from Raster Layer
    • Huntington District Cross walk tablesCreate tables from original raster layer table and corresponding USGS modified Anderson Level I table information. Created new Description.
    • Huntington DistrictUnique Anderson Class Table
    • Huntington DistrictUnique Anderson Class Table - Update
    • Huntington DistrictUnique Anderson Class Table - Update
    • Huntington District Class Table ImportanceThere must be the same number of classes in each comparison year for a DIRECT comparison  Not an issue at the larger Ohio River Basin level  Not an issue at smaller area comparisons  Issue at the HUC8 scale of comparison
    • Huntington DistrictMake Table Query
    • Huntington District HUCAnderson with Combine1Each HUC8 watershed with total Each Cell with HUC8 value code, and cell count and new class original class codes of 1992 and 2001 codes land cover
    • Huntington District Reclass Query DesignAll like values are linked between tables
    • Huntington DistrictReclass Query Results 1992
    • Huntington DistrictReclass Query Results 2001
    • Huntington DistrictTime to Merge Tables
    • Huntington DistrictInitial Merge Results
    • Huntington DistrictInitial Merge Results How do you calculate change percentage and map it?
    • Huntington DistrictSQL Formulas
    • Huntington District SQL Formulas1992 & 2001IIf(IsNull([1992reclass!COUNT]),0,[1992reclass!COUNT])ChangeRatio:IIf([1992]=0,([2001]/HUCAnderson!Total),[2001]/[1992])Percentage:IIf([2001]>[1992],[changeratio]*100,[changeratio]*-100)
    • Huntington DistrictResults
    • Huntington DistrictAlmost There…
    • Huntington DistrictSingle Class Queries
    • Huntington DistrictSingle Class Queries
    • Huntington DistrictFinal Goal
    • Huntington DistrictFinal Goal
    • Huntington District
    • Huntington District
    • Huntington District
    • Huntington District
    • Huntington District
    • Huntington District
    • Huntington DistrictAccuracy Concerns – 1992 Original
    • Huntington DistrictAccuracy Concerns - 2001
    • Huntington DistrictAccuracy Concerns – 1992 modified
    • Huntington District Resulting HypothesisThe land cover change from different sources is outside the 9% standard distribution curve of the percent change (location quotients) of the watersheds. The 90% represents the difference of equipment and seasonal variation.
    • Huntington District Land Cover Comparison1992 and 2001 land cover data was downloaded from the USGS National Map Seamless Server and reclassified based on the USGS Anderson Level I cross walk table. Both layers were then combined using ESRI ArcView and the supporting tables exported to Microsoft Access. The tables were then manipulated to extract the location quotients (LQ) for each class and joined based on HUC8 values. A HUC8 class table was created that insured a direct comparison of 7 classes.
    • Huntington District PosterA poster was from ESRI ArcMap with charts created in Microsoft Excel. Two large panels represent the Anderson Level I classified land cover for the project area. Small 7 map panels, one for each land classification,were mapped based on the standard deviation (StdDev) of the location quotients calculated in Microsoft Access. The StdDev values of the LQ’s within the 95% range were then mapped hollow. The charts reflect the raw LQ values crossing at the value of one.
    • Huntington District
    • Huntington DistrictQuestions ?
    • Huntington District Internet AtlasOhio River Comprehensive Reconnaissance Study (ORBCRS)  http://www.tinyurl.com/orbmaps  http://www.lrh.usace.army.mil/silver_jackets/ORB/thu mb.html  http://www.lrh.usace.army.mil/silver_jackets/ORB/200 9HanoverLandCoverPoster2009.pdf