This　paper　proposes　a　close-range　digital　photogrammetric　system　based　on　edge　detection　for　structural　deformation　measurement.　Different　from　traditional　photogrammetric　applications　using　discrete　points,　continuous　edges　in　digital　images　are　used　here　as　the　controlling　feature　in　this　new　system.　This　makes　it　possible　to　acquire　spatially　intensive　information.　The　system　uses　several　digital　images　of　the　structure,　taken　from　a　number　of　different　stations　before　and　after　the　deformation　is　induced.　Then,　an　image-matching　algorithm　based　on　the　coplanarity　condition　developed　here　is　applied　to　establish　spatial　relationships　of　the　interested　edges,　identified　by　using　a　new　high-precision　method.　These　relationships　are　subsequently　employed　to　acquire　full-field　deformation　measurement　of　the　structure.　A　series　of　experiments　was　conducted　in　the　laboratory　to　investigate　the　capability　of　the　new　photogrammetric　system.　Results　show　that　the　system　is　highly　accurate　and　suitable　for　structural　deformation　measurement.　It　offers　noncontact,　full-field,　and　spatially　intensive　measurement,　in　contrast　with　conventional　contact　and　point-measurement.　DOI:　10.1061/(ASCE)EM.1943-7889.0000251.　(C)　2011　American　Society　of　Civil　Engineers.