== Frequently Asked Questions == === Hyperspectral Data and Deliveries === * [wiki:FAQ/hyperatcor I have no ground truth reflectance data - how can I convert my radiance to reflectance?] * [wiki:FAQ/hyperxmltags What do the tags in the line and project information XML files mean?] * [wiki:FAQ/converttofloat How do I convert the data type of BIL files to floats?] * [wiki:FAQ/level3unzipping Why are the level 3 files so large when they are unzipped?] * [wiki:FAQ/bandwidth What are the bandwidths/band centres of my data?] * [wiki:FAQ/units My data values are much larger than I was expecting. What units are the data in?] ==== APL ==== * [wiki:FAQ/aplaz What is the difference between APLCorr and Azgcorr?] * [wiki:FAQ/aplmask What do the values in my mask file represent?] * [wiki:FAQ/aplmissingscans Why does my mapped image have black bars across track?] * [wiki:FAQ/apldemformat What format should my DEM be in when using aplcorr?] * [wiki:FAQ/aplunrecognisedopt I get the error "unrecognised options on command line:", what does this mean?] * [wiki:FAQ/aplostn02gridshift Where can I get the grid shift file needed for apltran for describing the Ordnance Survey National Grid projection?] * [wiki:FAQ/aplunknownmapprojection I get the error "Unknown map projection: You will have to fill in the projection name and datum in the map info in the .hdr file yourself." when defining a projection using Proj4, what should I do?] === LiDAR Data === * [wiki:FAQ/lidarasciiformat What is the file format for my ASCII LiDAR data files?] * [wiki:FAQ/las2ascii How do I convert between LAS and ASCII file formats?] * [wiki:FAQ/lidartools Do NERC-ARF supply software to process the LiDAR data?] * [wiki:FAQ/dsmdtm Do NERC-ARF generate a DTM/DSM from LiDAR data?] === Digital Camera Data === * [wiki:FAQ/rcdorthorectification How can I orthorectify RCD imagery?] * [wiki:FAQ/eventfileformat What is the content of the delivered event file?] === Data Access === * [wiki:FAQ/downloadftp How do I download delivered NERC-ARF data via FTP?] * [wiki:FAQ/dataaccess How do I access the NERC-ARF data archive? ] * [wiki:FAQ/acknowledge How do I acknowledge NERC-ARF data in presentations/publications?] === Datums and Projections === * [wiki:FAQ/ostn02 If I load my NERC-ARF data with a GPS dataset in a GIS, they don't match. Why not?] Otherwise known as, why is British National Grid projection not where it should be, and what is OSTN02? * [wiki:FAQ/projections What is the difference between an ellipsoid, a geoid, a datum and a projection?] === Older data === ==== Azgcorr ==== '''PLEASE NOTE THAT AZGCORR IS NO LONGER BEING SUPPORTED AFTER 10 MAY 2015''' * [wiki:FAQ/azgcorrbend When I geocorrect data, Azgcorr stops and complains that the flightline has a turn in it - how can I process my data?] * [wiki:FAQ/processingspeed Is there any way to speed up geocorrecting my data or to reduce the file size of the geocorrected files?] * [wiki:FAQ/lev3blank Why are my geocorrected files much bigger than my level 1 files?] * [wiki:FAQ/lev3upsidedown Why are my geocorrected files upside down? Do I need to manually rotate images to make north "up"?] * [wiki:FAQ/lev3colourpixels Why do my geocorrected Eagle/Hawk files have unexpectedly red/green/blue/yellow pixels?] * [wiki:FAQ/azgcorrExpired My azgcorr has expired, where can I get a new one?] * [wiki:FAQ/azgcorrDEM What is the azgcorr ASCII DEM format?] * [wiki:FAQ/demtoosmall Why does azgcorr say "DEM does not enclose the image" and then stop, and how do I fix it?] * [wiki:FAQ/hdfsizelimit My image data is in a .bil file not an HDF, how do I geocorrect it with azgcorr?]