Re: [OSSIM] OSSIM Elevation

[Mike T. <mik...@gm...>]

Hi Dave,

Thanks for the quick reply!!!

Changing to raster_directory worked! I had previously tried
"general_raster_directory" as I had somehow thought that was the correct
value.

Mike

On Tue, Dec 6, 2022 at 4:12 PM David Burken <db...@gm...> wrote:

> Hi Mike,
>
> elevation_manager.elevation_source0.type: srtm_directory
>
> Would look for dot.hgt files(raw raster). If you want to use tiffs change
> it to "image_directory". Also don't forget to setup the geoid in your
> preferences.
> geoid_egm_96_grid:  /usr/local/ossim/share/ossim/geoids/egm96.grd
>
> $ ossim-info --height 39.5 -105.5
> elevation.info.cell:  /data1/elevation/srtm/1arc/N39W106.hgt
> elevation.info.geoid_name:  geoid1996
> elevation.info.geoid_offset:  -13.8020000457764
> elevation.info.gpt:  (39.5,-105.5,0,WGE)
> elevation.info.height_above_ellipsoid:  2769.19799995422
> elevation.info.height_above_msl:  2783
>
> Hope that helps.
>
> Take care,
> Dave
>
>
> On Tue, Dec 6, 2022 at 6:04 PM Mike Thompson <mik...@gm...> wrote:
>
>> I recently built and installed OSSIM but am having trouble using
>> elevation data.
>> OS: Ubuntu 22.04.1 LTS
>> ossim-info --version
>> 1.9.0
>>
>> Snip from my ossim_preferences.txt file:
>> elevation_manager.elevation_source0.connection_string:
>> $(OSSIM_DATA)/elevation/srtm/1arc_tif_from_USGS
>> //elevation_manager.elevation_source0.connection_string:
>> /home/mike/elevation/srtm/1arc_dt2_from_USGS
>> //elevation_manager.elevation_source0.connection_string:
>> /home/mike/elevation/srtm/1arc_ras_from_tif
>> //elevation_manager.elevation_source0.connection_string:
>> /home/mike/elevation/srtm/1arc_bil_from_USGS
>> //elevation_manager.elevation_source0.filename:
>> /home/mike/elevation/srtm/1arc_bil_from_USGS
>> elevation_manager.elevation_source0.enabled: true
>> elevation_manager.elevation_source0.type: srtm_directory
>> elevation_manager.elevation_source0.min_open_cells: 25
>> elevation_manager.elevation_source0.max_open_cells: 50
>> elevation_manager.elevation_source0.memory_map_cells: false
>> elevation_manager.elevation_source0.geoid.type: geoid1996
>>
>> (the lines which are commented out are other things I have tried)
>>
>> I downloaded 1 arc second SRTM data from USGS, I tried all available
>> formats: .bil, .tif, and .dt2.  I also tried converting the .tif to a .ras.
>> Specifically, I downloaded n39_w106_1arc_v2.*
>>
>> ossim-info --check-config reports:
>> elevation sources loaded:
>> elevation_source[0].connetion_string:
>> /home/mike/elevation/srtm/1arc_tif_from_USGS
>>
>> This is encouraging, but
>> $ ossim-info --height 39.5 -105.5
>> reports:
>> elevation.info.cell:  not_found
>>
>> I loaded the data from USGS into QGIS to confirm my assumption that 39.5
>> -105.5 is within the specified file.
>>
>> I have also tried renaming the SRTM files from the USGS to:
>> n39w106.*
>> which I understand is the convention for SRTM.
>>
>> Any help would be appreciated.
>>
>> Thanks,
>>
>> Mike
>>
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>