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##############################################################################################
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#
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# CreateImageDiffPlots
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#
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# R script generates collection plots that explore elevation discontinuities
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# border between ASTER and STRM data in mosaic images under development for Iplant.
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# Plots overwritten to single graphics device for first version.
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# Panel Plots to be added to next version.
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#
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# To run:
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#
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# 1) start R,
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#
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#
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# Input file: Csv table containing elevations for randomly-selected point pairs from
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# ASTER/CGIAR mosaic and CDEM images. Table is generated by the script: 'makeImagePairTable.r'
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# Author: Rick Reeves, NCEAS
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# May 1, 2011
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##############################################################################################
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#CreateImageDiffPlots <- function()
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#{
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# Read input table that was sorted OFFLINE in Excel on the first column (ColumnID)
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pointTable <-read.csv("tableForMark4000_5_8_SortColID.csv")
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#
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# Table created by randomly sampling from two superimposed
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# image:
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# 1) DOM mosaic image comprised of ASTER and SRTM components.
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# 2) 'Baseline' Canadian DEM (CDEM) image.
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#
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# The input table contains three rows for each randomly-selected
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# pixel pair from both images. Each row contains two pixel pairs,
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# the first pair drawn from the image mosaic, the second pair
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# drawn from the CDEM image:
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# First pair: North pixel, South pixel (ASTER/SRTM mosaic)
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# Second pair: North pixel, South pixel (CDEM)
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#
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# The first row of each 'triplet' contains pixel pairs North of border,
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# The second row contains pixel pairs spanning border,
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# The third row contains pixel pairs South of border,
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#
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# This script generates a series of plots that display
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# differences between:
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# 1) The mosaic and CDEM images
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# 2) Image pixels on and away from the ASTER / SRTM boundary.
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#
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northRowIndexes = seq(from=1, to=(nrow(pointTable) - 3),by=3)
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borderRowIndexes = seq(from=2, to=(nrow(pointTable) - 1),by=3)
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southRowIndexes = seq(from=3, to=(nrow(pointTable)),by=3)
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#
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# calculate and append the difference between elevations
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# and CDEM
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# these lines create the inputs for differnce image plots for each of three
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# pixel pair subsets: North of border (All Aster), border (combo Aster/Srtm),
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# South of border (all Srtm)
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#
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# First, add the 'difference columns' to the entire table
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#
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pointTable <-cbind(pointTable,(pointTable$elevNorth - pointTable$elevSouth))
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pointTable <-cbind(pointTable,(pointTable$cdemNorth - pointTable$cdemSouth))
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pointTable <-cbind(pointTable,(pointTable$elevNorth - pointTable$cdemNorth))
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pointTable <-cbind(pointTable,(pointTable$elevSouth - pointTable$cdemSouth))
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#
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colnames(pointTable)[6] <- "diffMosaicNorthSouth"
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colnames(pointTable)[7] <- "diffCDEMNorthSouth"
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colnames(pointTable)[8] <- "diffNorthMosaicCDEM"
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colnames(pointTable)[9] <- "diffSouthMosaicCDEM"
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# Difference between Mosaic (ASTER or CGIAR or border)
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# and CDEM elevation as pertentage of the mosaic elevation
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pointTable <-cbind(pointTable,(pointTable$diffNorthMosaicCDEM/pointTable$elevNorth * 100))
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pointTable <-cbind(pointTable,(pointTable$diffSouthMosaicCDEM/pointTable$elevSouth * 100))
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colnames(pointTable)[10] <- "magDiffMosaicCDEMNorthPct"
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colnames(pointTable)[11] <- "magDiffMosaicCDEMSouthPct"
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# For the plots, subdivide the table into three segments:
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# rows north of border
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# rows crossing border
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# rows south of border
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northRowTbl = pointTable[northRowIndexes,]
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borderRowTbl = pointTable[borderRowIndexes,]
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southRowTbl = pointTable[southRowIndexes,]
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#
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# Create plots
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#
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# First, plot North/South pixel elevation for North/Border/South subsets 'distance East from Western edge'.
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#
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plot(northRowTbl$ColumnID,northRowTbl$elevNorth,main="North (ASTER) Mosaic North Pixel Elevation",col="red",pch=".")
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message("Hit key for next plot...")
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browser()
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plot(borderRowTbl$ColumnID,borderRowTbl$elevNorth,main="Border Mosaic North Elevation",col="darkgreen",pch=".")
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message("Hit key for next plot...")
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browser()
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plot(southRowTbl$ColumnID,southRowTbl$elevNorth,main="South (SRTM) Mosaic North Elevation",col="blue",pch=".")
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message("Hit key for next plot...")
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browser()
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plot(northRowTbl$ColumnID,northRowTbl$elevNorth,main="North (ASTER) CDEM North Pixel Elevation",col="red",pch=".")
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message("Hit key for next plot...")
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browser()
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plot(borderRowTbl$ColumnID,borderRowTbl$elevNorth,main="Border CDEM North Pixel Elevation",col="darkgreen",pch=".")
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message("Hit key for next plot...")
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browser()
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plot(southRowTbl$ColumnID,southRowTbl$elevNorth,main="South (SRTM) CDEM North Elevation",col="blue",pch=".")
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message("Hit key for next plot...")
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browser()
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plot(northRowTbl$ColumnID,northRowTbl$elevSouth,main="North (ASTER) Mosaic South Pixel Elevation",col="red",pch=".")
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message("Hit key for next plot...")
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browser()
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plot(borderRowTbl$ColumnID,borderRowTbl$elevSouth,main="Border Mosaic South Elevation",col="darkgreen",pch=".")
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message("Hit key for next plot...")
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browser()
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plot(southRowTbl$ColumnID,southRowTbl$elevSouth,main="South (SRTM) Mosaic South Elevation",col="blue",pch=".")
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message("Hit key for next plot...")
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browser()
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plot(northRowTbl$ColumnID,northRowTbl$elevSouth,main="North (ASTER) CDEM South Pixel Elevation",col="red",pch=".")
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message("Hit key for next plot...")
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browser()
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plot(borderRowTbl$ColumnID,borderRowTbl$elevSouth,main="Border CDEM South Pixel Elevation",col="darkgreen",pch=".")
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message("Hit key for next plot...")
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browser()
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plot(southRowTbl$ColumnID,southRowTbl$elevSouth,main="South (SRTM) CDEM South Elevation",col="blue",pch=".")
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message("Hit key for next plot...")
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browser()
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#
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# Next, (for now) difference between North and South pixels in pair, for various regions
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#
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plot(northRowTbl$ColumnID,northRowTbl$diffMosaicNorthSouth,main="North (ASTER) Mosaic North/South Diff",col="red",pch=".")
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message("Hit key for next plot...")
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browser()
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plot(borderRowTbl$ColumnID,borderRowTbl$diffMosaicNorthSouth,main="Border Mosaic North/South Diff",col="darkgreen",pch=".")
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message("Hit key for next plot...")
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browser()
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plot(southRowTbl$ColumnID,southRowTbl$diffMosaicNorthSouth,main="South (SRTM) Mosaic North/South Diff",col="darkgreen",pch=".")
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message("Hit key for next plot...")
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browser()
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#
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plot(northRowTbl$ColumnID,northRowTbl$diffCDEMNorthSouth,main="North (ASTER) CDEM North/South Diff",col="red",pch=".")
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message("Hit key for next plot...")
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browser()
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plot(borderRowTbl$ColumnID,borderRowTbl$diffCDEMNorthSouth,main="Border CDEM North/South Diff",col="darkgreen",pch=".")
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message("Hit key for next plot...")
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browser()
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plot(southRowTbl$ColumnID,southRowTbl$diffCDEMNorthSouth,main="South (SRTM) CDEM North/South Diff",col="blue",pch=".")
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message("Hit key for next plot...")
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browser()
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# Next: the Mosaic/CDEM difference divided by the (ASTER or SRTM) elevation
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plot(northRowTbl$ColumnID,northRowTbl$magDiffMosaicCDEMNorthPct,col="red",pch=".",main="Elev Diff as PerCent of Mosaic Elev (North)")
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message("Hit key for next plot...")
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browser()
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plot(borderRowTbl$ColumnID,borderRowTbl$magDiffMosaicCDEMNorthPct,col="darkgreen",pch=".",main="Elev Diff as PerCent of Mosaic Elev (Border)")
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message("Hit key for next plot...")
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browser()
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plot(southRowTbl$ColumnID,southRowTbl$magDiffMosaicCDEMSouthPct,col="blue",pch=".",main="Elev Diff as PerCent of Mosaic Elev (South)")
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message("Hit key for next plot...")
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browser()
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# Finally: Mosaic vs CDEM difference vs elevation (north or south)
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plot(northRowTbl$elevNorth,northRowTbl$diffCDEMNorthSouth,col="red",pch=".",main="ASTER Elev Diff vs Mosaic Elev (North Pixel)")
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# plot(northRowTbl$elevSouth,southRowTbl$diffCDEMNorthSouth,col="darkgreen",pch=".",main="ASTER Elev Diff vs Mosaic Elev (South Pixel)")
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message("Hit key for next plot...")
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browser()
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plot(borderRowTbl$elevNorth,borderRowTbl$diffCDEMNorthSouth,col="darkgreen",pch=".",main="Border Elev Diff vs Mosaic Elev (North Pixel)")
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# plot(borderRowTbl$elevSouth,borderRowTbl$diffCDEMNorthSouth,col="darkgreen",pch=".",main="Border Elev Diff vs Mosaic Elev (South Pixel)")
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message("Hit key for next plot...")
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browser()
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plot(southRowTbl$elevNorth,southRowTbl$diffCDEMNorthSouth,col="blue",pch=".",main="SRTM Elev Diff vs Mosaic Elev (North Pixel)")
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# plot(southRowTbl$elevSouth,southRowTbl$diffCDEMNorthSouth,col="darkgreen",pch=".",main="SRTM Elev Diff vs Mosaic Elev (South Pixel)")
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message("end of plots")
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#}
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