Revision 4df82d84
Added by Jim Regetz over 13 years ago
- ID 4df82d84fdd60d4693464a0bc512f7ceb00b55b4
| terrain/aspect/aspect-assessment.R | ||
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# R code to plot latitudinal profiles of mean aspect, along with both |
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# RMSE and correlation coefficients comparing fused layers with both the |
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# raw ASTER and with the Canada DEM |
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# |
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# Jim Regetz |
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# NCEAS |
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# Created on 08-Jun-2011 |
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library(raster) |
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datadir <- "/home/regetz/media/temp/terrain/aspect" |
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# load aspect rasters |
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s.aster <- raster(file.path(datadir, "aster_300straddle_a.tif")) |
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s.srtm <- raster(file.path(datadir, "srtm_150below_a.tif")) |
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s.uncor <- raster(file.path(datadir, "fused_300straddle_a.tif")) |
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s.eramp <- raster(file.path(datadir, "fused_300straddle_rampexp_a.tif")) |
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s.bg <- raster(file.path(datadir, "fused_300straddle_blendgau_a.tif")) |
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s.can <- raster(file.path(datadir, "cdem_300straddle_a.tif")) |
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# extract raster latitudes for later |
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lats300 <- yFromRow(s.aster, 1:nrow(s.aster)) |
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lats150 <- yFromRow(s.srtm, 1:nrow(s.srtm)) |
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# initialize output pdf device driver |
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pdf("aspect-assessment.pdf", height=8, width=11.5)
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# |
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# plot latitudinal profiles of mean aspect |
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# |
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par(mfrow=c(2,2), omi=c(1,1,1,1)) |
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ylim <- c(160, 180) |
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plot(lats300, rowMeans(as.matrix(s.uncor), na.rm=TRUE), type="l", |
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xlab="Latitude", ylab="Mean aspect", ylim=ylim) |
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text(min(lats300), min(ylim)+0.5, pos=4, font=3, labels="uncorrected") |
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abline(v=60, col="red", lty=2) |
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mtext(expression(paste("Latitudinal profiles of mean aspect (",
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136*degree, "W to ", 96*degree, "W)")), adj=0, line=2, font=2) |
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plot(lats300, rowMeans(as.matrix(s.can), na.rm=TRUE), type="l", |
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xlab="Latitude", ylab="Mean aspect", ylim=ylim) |
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text(min(lats300), min(ylim)+0.5, pos=4, font=3, labels="Canada DEM") |
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abline(v=60, col="red", lty=2) |
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plot(lats300, rowMeans(as.matrix(s.eramp), na.rm=TRUE), type="l", |
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xlab="Latitude", ylab="Mean aspect", ylim=ylim) |
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text(min(lats300), min(ylim)+0.5, pos=4, font=3, labels="exponential ramp") |
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abline(v=60, col="red", lty=2) |
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plot(lats300, rowMeans(as.matrix(s.bg), na.rm=TRUE), type="l", |
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xlab="Latitude", ylab="Mean aspect", ylim=ylim) |
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text(min(lats300), min(ylim)+0.5, pos=4, font=3, labels="gaussian blend") |
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abline(v=60, col="red", lty=2) |
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# |
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# plot latitudinal profiles of RMSE |
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# |
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# simple helper function to calculate row-wise RMSEs |
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rmse <- function(r1, r2, na.rm=TRUE) {
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sqrt(rowMeans(as.matrix((r1 - r2)^2), na.rm=na.rm)) |
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} |
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par(mfrow=c(2,3), omi=c(1,1,1,1)) |
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ylim <- c(0, 170) |
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# ...with respect to ASTER |
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plot(lats300, rmse(s.uncor, s.aster), type="l", xlab="Latitude", |
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ylab="RMSE", ylim=ylim) |
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lines(lats150, rmse(crop(s.uncor, extent(s.srtm)), s.srtm), col="blue") |
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legend("topright", legend=c("ASTER", "SRTM"), col=c("black", "blue"),
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lty=c(1, 1), bty="n") |
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text(min(lats300), max(ylim)-5, pos=4, font=3, labels="uncorrected") |
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abline(v=60, col="red", lty=2) |
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mtext(expression(paste( |
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"Aspect discrepancies with respect to separate ASTER/SRTM components (",
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136*degree, "W to ", 96*degree, "W)")), adj=0, line=2, font=2) |
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plot(lats300, rmse(s.eramp, s.aster), type="l", xlab="Latitude", |
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ylab="RMSE", ylim=ylim) |
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lines(lats150, rmse(crop(s.eramp, extent(s.srtm)), s.srtm), col="blue") |
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legend("topright", legend=c("ASTER", "SRTM"), col=c("black", "blue"),
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lty=c(1, 1), bty="n") |
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text(min(lats300), max(ylim)-5, pos=4, font=3, labels="exponential ramp") |
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abline(v=60, col="red", lty=2) |
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plot(lats300, rmse(s.bg, s.aster), type="l", xlab="Latitude", |
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ylab="RMSE", ylim=ylim) |
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lines(lats150, rmse(crop(s.bg, extent(s.srtm)), s.srtm), col="blue") |
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legend("topright", legend=c("ASTER", "SRTM"), col=c("black", "blue"),
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lty=c(1, 1), bty="n") |
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text(min(lats300), max(ylim)-5, pos=4, font=3, labels="gaussian blend") |
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abline(v=60, col="red", lty=2) |
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# ...with respect to CDEM |
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plot(lats300, rmse(s.uncor, s.can), type="l", xlab="Latitude", |
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ylab="RMSE", ylim=ylim) |
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text(min(lats300), max(ylim)-5, pos=4, font=3, labels="uncorrected") |
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abline(v=60, col="red", lty=2) |
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mtext(expression(paste( |
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"Aspect discrepancies with respect to Canada DEM (",
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136*degree, "W to ", 96*degree, "W)")), adj=0, line=2, font=2) |
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plot(lats300, rmse(s.eramp, s.can), type="l", xlab="Latitude", |
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ylab="RMSE", ylim=ylim) |
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text(min(lats300), max(ylim)-5, pos=4, font=3, labels="exponential ramp") |
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abline(v=60, col="red", lty=2) |
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plot(lats300, rmse(s.bg, s.can), type="l", xlab="Latitude", |
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ylab="RMSE", ylim=ylim) |
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text(min(lats300), max(ylim)-5, pos=4, font=3, labels="gaussian blend") |
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abline(v=60, col="red", lty=2) |
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# |
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# plot latitudinal profiles of correlation coefficients |
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# |
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# simple helper function to calculate row-wise correlation coefficients |
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corByLat <- function(r1, r2, rows) {
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if (missing(rows)) {
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rows <- 1:nrow(r1) |
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} |
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m1 <- as.matrix(r1) |
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m2 <- as.matrix(r2) |
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sapply(rows, function(row) cor(m1[row,], m2[row,], |
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use="pairwise.complete.obs")) |
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} |
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par(mfrow=c(2,3), omi=c(1,1,1,1)) |
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ylim <- c(0, 1) |
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# ...with respect to ASTER |
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plot(lats300, corByLat(s.uncor, s.aster), type="l", xlab="Latitude", |
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ylab="Correlation", ylim=ylim) |
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lines(lats150, corByLat(crop(s.uncor, extent(s.srtm)), s.srtm), col="blue") |
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legend("bottomright", legend=c("ASTER", "SRTM"), col=c("black", "blue"),
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lty=c(1, 1), bty="n") |
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text(min(lats300), min(ylim), pos=4, font=3, labels="uncorrected") |
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abline(v=60, col="red", lty=2) |
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mtext(expression(paste( |
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"Aspect correlations with respect to separate ASTER/SRTM components (",
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136*degree, "W to ", 96*degree, "W)")), adj=0, line=2, font=2) |
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plot(lats300, corByLat(s.eramp, s.aster), type="l", xlab="Latitude", |
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ylab="Correlation", ylim=ylim) |
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lines(lats150, corByLat(crop(s.eramp, extent(s.srtm)), s.srtm), col="blue") |
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legend("bottomright", legend=c("ASTER", "SRTM"), col=c("black", "blue"),
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lty=c(1, 1), bty="n") |
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text(min(lats300), min(ylim), pos=4, font=3, labels="exponential ramp") |
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abline(v=60, col="red", lty=2) |
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plot(lats300, corByLat(s.bg, s.aster), type="l", xlab="Latitude", |
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ylab="Correlation", ylim=ylim) |
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lines(lats150, corByLat(crop(s.bg, extent(s.srtm)), s.srtm), col="blue") |
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legend("bottomright", legend=c("ASTER", "SRTM"), col=c("black", "blue"),
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lty=c(1, 1), bty="n") |
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text(min(lats300), min(ylim), pos=4, font=3, labels="gaussian blend") |
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abline(v=60, col="red", lty=2) |
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# ...with respect to CDEM |
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plot(lats300, corByLat(s.uncor, s.can), type="l", xlab="Latitude", |
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ylab="Correlation", ylim=ylim) |
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text(min(lats300), min(ylim), pos=4, font=3, labels="uncorrected") |
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abline(v=60, col="red", lty=2) |
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mtext(expression(paste( |
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"Aspect correlations with respect to Canada DEM (",
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136*degree, "W to ", 96*degree, "W)")), adj=0, line=2, font=2) |
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plot(lats300, corByLat(s.eramp, s.can), type="l", xlab="Latitude", |
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ylab="Correlation", ylim=ylim) |
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text(min(lats300), min(ylim), pos=4, font=3, labels="exponential ramp") |
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abline(v=60, col="red", lty=2) |
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plot(lats300, corByLat(s.bg, s.can), type="l", xlab="Latitude", |
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ylab="Correlation", ylim=ylim) |
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text(min(lats300), min(ylim), pos=4, font=3, labels="gaussian blend") |
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abline(v=60, col="red", lty=2) |
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# close pdf device driver |
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dev.off() |
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Also available in: Unified diff
added code to profile aspect near 60N boundary (just like slope code)