[gdal-dev] ICORDS error creating NITF with BLOCKA

[Jacklin Matthew D]

Hi,

 

I am trying to create a NITF file using the BLOCKA extension but the
ICORDS field in the resulting file appears to be incorrect.

 

The following is an example attempt - the lat/lon positions are in
decimal format and the ICORDS field is set to be "D" (decimal). However
after processing the resulting NITF file has an ICORDS field of "G"
(geographic) and as the IGEOLO fields are in decimal format the NITF
file is invalid. 

 

 

 

REM format is lat: "+dd.dddddd" and lon: +ddd.dddddd"

set ul_lat=+51.236900

set ul_lon=-002.053840

 

set lr_lat=+51.233300

set lr_lon=-002.042380

 

set a=-co "BLOCKA_BLOCK_COUNT=1"

set b=-co "BLOCKA_BLOCK_INSTANCE_01=01"

set c=-co "BLOCKA_N_GRAY_01=00000"

set d=-co "BLOCKA_L_LINES_01=01000"

set e=-co "BLOCKA_LAYOVER_ANGLE_01=   "

set f=-co "BLOCKA_SHADOW_ANGLE_01=   "

REM set g=-co "BLOCKA_BLANKS_01=16 chars"

set h=-co "BLOCKA_FRLC_LOC_01=%lr_lat%%ul_lon%"

set i=-co "BLOCKA_LRLC_LOC_01=%lr_lat%%lr_lon%"

set j=-co "BLOCKA_LRFC_LOC_01=%ul_lat%%lr_lon%"

set k=-co "BLOCKA_FRFC_LOC_01=%ul_lat%%ul_lon%"

 

gdal_translate -of NITF -a_srs WGS84 -a_ullr ul_lon ul_lat lr_lon lr_lat
a% %b% %c% %d% %e% %f% %h% %i% %j% %k% -co "ICORDS=D" input.png
output.ntf

 

 

 

I have also noticed if the BLOCKA_L_LINES fields is less than the actual
number of lines in the input file, it appears the ICORDS field will be
set to "G" and the IGEOLO fields will be converted to geographic
format?!

 

Any ideas or help appreciated.

 

 

Thanks.

 

  Matt Jacklin.


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