The .bld file id n. kind of object n.of records 00006 "building" 00005 2701.1400003289.780000 2702.2500003260.020000 Horiz.coordinates of the polygon vertexes 2735.1200003261.150000 (the last one is a duplicate of the first one) 2734.3100003290.930000 2701.1400003289.780000 00007 "building" 00007 3 2752.4000003292.380000 2752.9300003277.880000 2797.1700003278.730000 ⊙ 2797.6200003263.370000 2811.3500003263.780000 2811.0300003293.620000 1 2 2752.4000003292.380000 1Z17 The .bld file 00006 "building" 00005 2701.140000 3289.780000 2702.250000 3260.020000 2735.120000 3261.150000 2734.310000 3290.930000 2701.140000 3289.780000 00007 "building" 00007 2752.400000 3292.380000 2752.930000 3277.880000 2797.170000 3278.730000 2797.620000 3263.370000 2811.350000 3263.780000 2811.030000 3293.620000 2752.400000 3292.380000 id n. kind of object n. of records Horiz. coordinates of the polygon vertexes (the last one is a duplicate of the first one) 1 2 4 3