Commit bdea5d4a authored by Julien Osman's avatar Julien Osman
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DOC: Add a section about the DEM in supported sensors

parent f805e79e
Pipeline #9035 canceled with stages
in 18 minutes and 22 seconds
......@@ -17,24 +17,3 @@ The ``otb::DEMHandler`` class is a singleton, a reference to the singleton objec
* No SRTM and no geoid available: 0
Several DEM tiles can be provided at the same time, using the ``OpenDEMDirectory`` method. All raster from the input directory will be opened by GDAL. Internally, a mosaic of all DEM tiles is then created as a virtual dataset (vrt).
All raster that can be opened by gdal can be used as a geoid. In previous OTB versions (using Ossim) it was common to use the egm96.grd file as geoid, this file cannot be opened by GDAL. However it is still possible to use it by using the following egm96.grd.hdr file::
ENVI
samples = 1441
lines = 721
bands = 1
header offset = 24
file type = ENVI Standard
data type = 4
interleave = bsq
sensor type = Unknown
byte order = 1
wavelength units = Unknown
map info = {Geographic Lat/Lon, 1, 1,-0.125, 90.125, 0.25, 0.25,WGS-84}
coordinate system string = {GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]}
band names = {
Band 1}
With this file attached, GDAL will be able to read the egm96.grd file as a ENVI dataset
\ No newline at end of file
......@@ -91,7 +91,7 @@ second subdataset.
Vector data
-------------
-----------
OTB can read all vector format supported by ORG. But the writing
process is a little tricky. OTB implements two ways of dealing with
......@@ -115,3 +115,40 @@ we plan on fixing this. For now, formats fully supported
- GeoPackage (.gpkg)
Digital Elevation Modele
------------------------
OTB also relies on GDAL to access DEM data. Therefore, any raster
format supported by GDAL can be used as DEM. Several DEM tiles can be
provided at the same time by providing a directory. All raster from
the input directory will be opened by GDAL.
It is the same for the geoid.
A note on the egm96.grd file
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In previous OTB versions (using Ossim) it was common to use the
egm96.grd file as geoid. This file cannot be opened by GDAL. However
it is still possible to use it by using the following egm96.grd.hdr
file::
ENVI
samples = 1441
lines = 721
bands = 1
header offset = 24
file type = ENVI Standard
data type = 4
interleave = bsq
sensor type = Unknown
byte order = 1
wavelength units = Unknown
map info = {Geographic Lat/Lon, 1, 1,-0.125, 90.125, 0.25, 0.25,WGS-84}
coordinate system string = {GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]}
band names = {
Band 1}
With this file attached, GDAL will be able to read the egm96.grd file
as a ENVI dataset.
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