Re: [otb-users] Simple geometry tools in OTB?

[Guillaume Pasero]

Hi, On 03/21/2017 09:18 AM, Agustin Lobo wrote: I guess the second. Examples: http://geog.uoregon.edu/amarcus/geog418/Labs/Lab06_rectification.htm The polynomial can be fit and applied using gdal_translate to incorporate the GCPs and then gdalwarp r near order 2 to apply the transformation but the way of introducing the GCPs is kind of inconvenient. This problem is more about sensor model fitting. You have an image in sensor geometry and you try to ortho-rectify it on ground based on a set of GCPs. The OTB already has an application to assess a RPC sensor model based on GCPs. The polynomial model is a particular case of rational model, maybe setting the denominator coefficients to [1,0,0,...,0] will do the trick. Guillaume Yes, I agree. But can this be done in practice? Also, is there a tool in OTB to actually fit such a rational polynomial with prescribed denominators? No, at the moment there is no way to estimate a polynomial transform based on GCPs. If the transform is already computed, it can be fed into a *.geom file to act as a RPC model with denominator coefficients set like proposed. Anyway, please consider also my suggestion of including the method described in Pala, V., and X. Pons. 1995. “Incorporation of Relief in Polynomial-Based Geometric Correction.” Photogrametrics Engineering & Remote Sensing 61: 935–44. https://www.researchgate.net/publication/244485309_Incorporation_of_relief_polynomial-based_geometric_corrections The sensor models in OTB (RPC based or physical) should already take into account elevation. The inverse localization function is modeled like :     (row,col) = F_inv(x,y,z) -- Guillaume PASERO Responsable technique Business Unit ESPACE & GeoInformation - Département Payload Data & 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 - guillaume.pas...@c-s.fr -- -- 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 otb-users@googlegroups.com To unsubscribe from this group, send email to otb-users+unsubscr...@googlegroups.com 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 otb-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.