Apparatus for mapping, comprising: a probe configured to: generate an initial set of measured values of a physiological parameter, which were measured at respective locations in a body organ, and generate a three-dimensional map of the organ comprising an array of spatial map elements; and a processor, configured to: form a correspondence between the respective locations at which the measured values were measured and a sub-group of the map elements, and in response to the correspondence, associate respective element values of the physiological parameter with map elements other than the sub-group; the apparatus being characterized by the processor being configured to: adjust the respective element values assuming geodesic transfer of the physiological parameter between contiguous map elements, and display a map of the organ showing the adjusted element values. a probe configured to: generate an initial set of measured values of a physiological parameter, which were measured at respective locations in a body organ, and generate a three-dimensional map of the organ comprising an array of spatial map elements; and a processor, configured to: form a correspondence between the respective locations at which the measured values were measured and a sub-group of the map elements, and in response to the correspondence, associate respective element values of the physiological parameter with map elements other than the sub-group; the apparatus being characterized by the processor being configured to: adjust the respective element values assuming geodesic transfer of the physiological parameter between contiguous map elements, and display a map of the organ showing the adjusted element values. generate an initial set of measured values of a physiological parameter, which were measured at respective locations in a body organ, and generate a three-dimensional map of the organ comprising an array of spatial map elements; and a processor, configured to: form a correspondence between the respective locations at which the measured values were measured and a sub-group of the map elements, and in response to the correspondence, associate respective element values of the physiological parameter with map elements other than the sub-group; the apparatus being characterized by the processor being configured to: adjust the respective element values assuming geodesic transfer of the physiological parameter between contiguous map elements, and display a map of the organ showing the adjusted element values. form a correspondence between the respective locations at which the measured values were measured and a sub-group of the map elements, and in response to the correspondence, associate respective element values of the physiological parameter with map elements other than the sub-group; the apparatus being characterized by the processor being configured to: adjust the respective element values assuming geodesic transfer of the physiological parameter between contiguous map elements, and display a map of the organ showing the adjusted element values. adjust the respective element values assuming geodesic transfer of the physiological parameter between contiguous map elements, and display a map of the organ showing the adjusted element values.