Guillaume Pasero <[email protected]> wrote: > > The format for tie points file is a 'csv type' ASCII file. > The fields order is : "col row lon lat" (by the way, documentation has > a wrong order) > Separator is a tabulation. > Lines starting with '#' are ignored. >
Thank you for the details. The following question is: once I have the RPC model, how do I tell the ortho-rectification application to use it? Jordi > Regards, > Guillaume > > On 03/16/2015 04:23 PM, Jordi Inglada wrote: > > 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] > * > > -- > > > -- > > * 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] > * > > -- -- -- Check the OTB FAQ at http://www.orfeo-toolbox.org/FAQ.html You received this message because you are subscribed to the Google Groups "otb-users" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/otb-users?hl=en --- You received this message because you are subscribed to the Google Groups "otb-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
