Guillaume Pasero <[email protected]> wrote:
>
> Hi Jordi,
>
> gdal is saying that :
> - your image has no coordinate system, which is okay for an image in
> sensor geomtry
I understand.
> - the GCPs in your image are defined in the EPSG:4326 coordinate
> system, which means that the ground coordinated of your GCPs are
> expressed in plain lon/lat .
>
OK.
> OTB needs a sensor model to reproject your image. Check with
> "otbcli_ReadImageInfo -keywordlist 1" if there is a RPC model
> detected.
I dont't think there is an RPC model:
-----------
Image OSSIM keywordlist (optional):
Ossim Keyword list:
Output parameters value:
indexx: 0
indexy: 0
sizex: 25397
sizey: 20713
spacingx: 1
spacingy: 1
originx: 0.5
originy: 0.5
estimatedgroundspacingx: 900.0325928
estimatedgroundspacingy: 328.9576721
numberbands: 1
sensor:
id:
time:
ullat: 0
ullon: 0
urlat: 0
urlon: 0
lrlat: 0
lrlon: 0
lllat: 0
lllon: 0
town:
country:
rgb.r: 0
rgb.g: 1
rgb.b: 2
projectionref:
keyword: Ossim Keyword list:
--------------
> Otherwise, you could try to estimate an RPC model from the GCPs
> (application GenerateRPCSensorModel).
>
I have >250 GCPs in the image, so that should do it.
What is the format of the tie points file for this application?
Thank you.
Jordi
> Regards,
> Guillaume
>
> On 03/13/2015 03:06 PM, Jordi Inglada wrote:
>
> Hi all,
>
> I have been trying to reproject Sentinel-1 imagery with OTB and I am having
> difficulties.
>
> I am using IW-GRD (non-complex) images which are in geotiff format and
> contain GCPs. It's been a long time since I worked with image projections, so
> I may be misunderstanding things.
>
> First of all, OTB tells me that:
>
> Estimated ground spacing (in meters): [900.033,328.958]
>
> which is definitely wrong. Having a look at the meta-data (with both
> ReadImageInfo and gdalinfo) I get coherent results in terms of GCPs,
> projections and sizes, but there are things which seem suspicious like the
> fact that there is no coordinate system defined and that there are 2 EPSG
> codes (gdalinfo):
>
> ----------------
> Size is 25397, 20713
> Coordinate System is `'
> GCP Projection =
> GEOGCS["WGS 84",
> DATUM["WGS_1984",
> SPHEROID["unnamed",6378137,298.257223560493,
> AUTHORITY["EPSG","4326"]],
> AUTHORITY["EPSG","6326"]],
> PRIMEM["Greenwich",0],
> UNIT["degree",0.0174532925199433],
> AUTHORITY["EPSG","4326"]]
> GCP[ 0]: Id=1, Info=
> (0,0) -> (3.35838036356165,44.0387571612464,573.503620014526)
>
> etc.
> -----------------
>
>
>
> and ReadImageInformation says the same but gives me funny origin and spacing:
>
> -----------------
> Origin : [0.5,0.5]
> Spacing : [1,1]
> Estimated ground spacing (in meters): [900.033,328.958]
> -----------------
>
> For geometry and EPSG-codes experts, do you think that there are problems
> with the meta-data?
>
> I could maybe fix the problem with gdal_edit?
>
> Has anyone already worked with Sentinel-1 geometry corrections using
> gdal/ossim/OTB?
>
> Thank you.
>
> Jordi
>
> --
>
> * Guillaume PASERO
> Ingénieur d'études et développement
> Business Unit E-SPACE & Geo Information - Département
> APPLICATIONS
>
> CS Systèmes d'Information
> Parc de la Grande Plaine - 5, Rue Brindejonc des Moulinais -
> BP 15872
> 31506 Toulouse Cedex 05 - FRANCE
> +33 561 17 64 21 - [email protected]
> *
>
> --
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