In order to obtain the DEM terrain elevation is usually calculated by photogrammetry method, which is based on
establishing the correspondence between stereo images. However it is difficult to find the salient correspondence features
in textureless or difficult texture regions such us mountain, snow or desert area. To solve the problem we use the shape
from shading (SFS) to extract the surface elevation of the textureless area from one image. SFS is a very ill-posed and
underconstrainted problem. The primary overwhelming assumption SFS is he Lambertian-based image irradiance
equation with constant albedo for each ground point. Due to the physics of imaging process, satellite images do not
exhibit constant albedo properties and the distribution of the surface albedo is not uniform. To address the problems
above, we develop a shape recovery algorithm for the areas of weak texture or difficult texture. Given coarse DEM in
weak texture area and optical image of higher spatial resolution we estimated the albedo for each ground points using
relief image calculated from coarse DEM. With the known sun zenith and azimuth angles the image irradiance map is
formulated as a general static Hamilton-Jacobi equation and is solved using a fast sweeping numerical method with
several ground truth elevation points as boundary conditions. Landsat 7 ETM+ band 4 image and SRTM 90m global
DEM data as reference surface elevation map are used to evaluate the algorithm proposed. Experiments indicate the
effectiveness of the proposed method for surface elevation estimation for textureless area.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.