1. A computer-implemented method of determining a texture for rendering in conjunction with a three-dimensional model of a geographic area, the method comprising: accessing, by one or more computing devices, a polygon mesh modeling a geographic area; identifying, by the one or more computing devices, a plurality of source images depicting the geographic area corresponding to the polygon mesh; aligning, by the one or more computing devices, the plurality of source images to reduce projection misalignments between source images when projected to the polygon mesh; and determining, by the one or more computing devices, a texel value for a texture associated with a point on the surface of the polygon mesh based at least in part on a weighted average, the weighted average determined at least in part from a plurality of pixels in the plurality of source images corresponding to the point on the surface of the polygon mesh; wherein the method comprises identifying an outlier pixel in the plurality of pixels corresponding to the point on the surface of the polygon mesh; and excluding the outlier pixel from inclusion in the weighted average in determining the texel value for the point on the surface of the polygon mesh to allow for removal of transient objects from the three-dimensional model.