Opened 14 years ago

Closed 14 years ago

#347 closed bug (fixed)

DEM generation script fails on long lines

Reported by: benj Owned by: iopa
Priority: alpha 4 high Milestone:
Component: PML utilities Keywords:
Cc: benj Other processors:


The script used to generate DEMs for UK flightlines ( currently only takes into account the start and end position of the aircraft on each line (because it reads these from the header files). This means that on long lines where there is an entire BNG tile between the start and the end it may not include DEM data for the whole flightline.

Possible solutions:

  1. (Preferred): Read SBET file in (using, unless you've got a pressing reason to do it another way), track position of aircraft and do maths on swath width to work out which BNG tile the aircraft is over (ensuring it's in the UK as well).
  2. (Possibly easier): Adapt existing script to be more intelligent about what tiles might be in the middle. May be easier but might be complicated by corner case and/or case where rolls over tile edge (9->0).

Change History (2)

comment:1 Changed 14 years ago by iopa

Choosing solution 1, I have created a script to replace, in essence,, which is the source that used to be told which tiles to load. I have tested my script with a copy of, by replacing with the new script and a whole, continuous DEM file is successfully generated in the same manner as before (covering the the whole of the london flight lines, which were used as test samples).

What remains before it is released is for it to be documented and commented (more of an early morning job).

comment:2 Changed 14 years ago by iopa

  • Resolution set to fixed
  • Status changed from new to closed
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