emre <[email protected]> wrote: > > Hi there, > I am searching for a function to access exact DEM grid locations that are > closest to a given location. For > example, lets say I am using SRTM data (which is not certain. I need to use > different resolution DEM files) and I > need to find the height of four DEM locations that are closest to a given > point. > > The problem is, I cant get the resolution (x or y sampling distance) of the > dem from demhandler. If I could, it > would be possible to compute these four locations. My question is, is it > possible to get the resolution of the dem > from demhandler or do you know a way to compute these four grid locations > directly. >
Using the DEM as an image (see http://www.orfeo-toolbox.org/doxygen-current/classotb_1_1DEMToImageGenerator.html), you can use the conversions from PhysicalPoint to Index provided by the otb::Image class: template<typename TCoordRep , typename TIndexRep > void TransformContinuousIndexToPhysicalPoint (const ContinuousIndex< TIndexRep, VImageDimension > &index, Point< TCoordRep, VImageDimension > &point) const template<typename TCoordRep > void TransformIndexToPhysicalPoint (const IndexType &index, Point< TCoordRep, VImageDimension > &point) const template<typename TCoordRep > void TransformLocalVectorToPhysicalVector (const FixedArray< TCoordRep, VImageDimension > &inputGradient, FixedArray< TCoordRep, VImageDimension > &outputGradient) const template<typename TCoordRep , typename TIndexRep > bool TransformPhysicalPointToContinuousIndex (const Point< TCoordRep, VImageDimension > &point, ContinuousIndex< TIndexRep, VImageDimension > &index) const Get the continuous index from a physical point. More... template<typename TCoordRep > bool TransformPhysicalPointToIndex (const Point< TCoordRep, VImageDimension > &point, IndexType &index) const Jordi > All the best > Emre > > -- > -- > 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-/[email protected] > To unsubscribe from this group, send email to > otb-users+unsubscribe-/[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 otb-users+unsubscribe-/ > [email protected]. > For more options, visit https://groups.google.com/d/optout. -- -- 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.
