DroneMapper.com: Basic Geo-referenced Mosaic Construction w/ GDAL (projection)

dronemapper_buildgdalmosaic.sh

#!/bin/bash

###
### JP Stoermer
### DroneMapper.com
###

### Clean up
rm -rf ./*._tif
rm -rf ./mosaic.tif
rm -rf ./mosaic.vrt
rm -rf ./mosaic.png

ARG1=$1
WATERMARKS=$2

### Rename JPGW if needed
for FILE in ./*.JPGw ; do NEWFILE=`echo $FILE | sed 's/.JPGw$/.jpgw/'` ; mv $FILE $NEWFILE ; done

### Find UTM Zone from JPGW
UTMZONE=`cat ./*.jpgw | grep UTM | awk -F" " {'print $4'} | head -1`

### Build GeoTIF
for FILE in ./*.JPG ; do NEWFILE=`echo $FILE | sed 's/.JPG$/._tif/'` ; /usr/bin/gdalwarp -t_srs "+proj=utm +zone=$UTMZONE +datum=WGS84" -wo "SKIP_NOSOURCE=yes" -r bilinear -dstnodata 255 $FILE $NEWFILE; done

### Build VRT
/usr/bin/gdalbuildvrt -resolution $ARG1 ./mosaic.vrt ./*._tif

### Build Final Mosaic
/usr/bin/gdalwarp -t_srs "+proj=utm +zone=$UTMZONE +datum=WGS84" -wo "SKIP_NOSOURCE=yet" -dstnodata 255 -r bilinear ./mosaic.vrt ./mosaic.tif

### Scale and Convert to PNG
convert ./mosaic.tif -transparent white -scale 5% ./mosaic.png

if [ $WATERMARKS == "watermarks" ]
then
composite -gravity center -dissolve 25 /www/html/files/dm_watermark_small.png ./mosaic.png ./mosaic.png
composite -dissolve 25 -tile /www/html/files/dm_watermark.png ./mosaic.tif ./mosaic.tif
fi

rm -rf ./*._tif
rm -rf ./mosaic.vrt

I think "SKIP_NOSOURCE=yet" should be "SKIP_NOSOURCE=YES"