foxtrot_xray Posted January 17, 2012 Share Posted January 17, 2012 I was reading a document ("Manual of Geodetic Leveling"), and came across the following: 44. Since paragraph 41 now requires that benchmarks be established at 1-mile-intervals, except when transportation difficulties are unusually great, it shall be considered good practice, when operating along route where bench-mark trucks cannot be driven, and in the absence of rock outcrops, large well-imbedded boulders, or existing structures, to place bench marks at alternate mile intervals in trees. When bench marks are places in trees, there should be two marks established from one to three setups apart. Both marks should be in the main line of levels rather than on spurs. The marks should be set in trees by boring a hole in the tree to a depth equal to the solid portion of the shank of the disk and of a diameter slightly less than that of the shank, and then driving the tablet in the hole till the disk is flush with a previously smoothed surface. (Emphasis added by me.) Now, I've seen pictures of bearing trees and other items in trees - but I have never heard or seen images of a *disk* in a tree. This is news to me. Has anyone ever seen this? Quote Link to comment
+LSUFan Posted January 17, 2012 Share Posted January 17, 2012 I was reading a document ("Manual of Geodetic Leveling"), and came across the following: 44. Since paragraph 41 now requires that benchmarks be established at 1-mile-intervals, except when transportation difficulties are unusually great, it shall be considered good practice, when operating along route where bench-mark trucks cannot be driven, and in the absence of rock outcrops, large well-imbedded boulders, or existing structures, to place bench marks at alternate mile intervals in trees. When bench marks are places in trees, there should be two marks established from one to three setups apart. Both marks should be in the main line of levels rather than on spurs. The marks should be set in trees by boring a hole in the tree to a depth equal to the solid portion of the shank of the disk and of a diameter slightly less than that of the shank, and then driving the tablet in the hole till the disk is flush with a previously smoothed surface. (Emphasis added by me.) Now, I've seen pictures of bearing trees and other items in trees - but I have never heard or seen images of a *disk* in a tree. This is news to me. Has anyone ever seen this? WOW! never seen this, but there are lot's of things I have never seen. I'd hate to be a sawmill worker and have a tree come in with a disk in it unbeknownst. Quote Link to comment
+DukeOfURL01 Posted January 17, 2012 Share Posted January 17, 2012 I was reading a document ("Manual of Geodetic Leveling"), and came across the following: 44. Since paragraph 41 now requires that benchmarks be established at 1-mile-intervals, except when transportation difficulties are unusually great, it shall be considered good practice, when operating along route where bench-mark trucks cannot be driven, and in the absence of rock outcrops, large well-imbedded boulders, or existing structures, to place bench marks at alternate mile intervals in trees. When bench marks are places in trees, there should be two marks established from one to three setups apart. Both marks should be in the main line of levels rather than on spurs. The marks should be set in trees by boring a hole in the tree to a depth equal to the solid portion of the shank of the disk and of a diameter slightly less than that of the shank, and then driving the tablet in the hole till the disk is flush with a previously smoothed surface. (Emphasis added by me.) Now, I've seen pictures of bearing trees and other items in trees - but I have never heard or seen images of a *disk* in a tree. This is news to me. Has anyone ever seen this? WOW! never seen this, but there are lot's of things I have never seen. I'd hate to be a sawmill worker and have a tree come in with a disk in it unbeknownst. Fortunately they thought of that a while ago, logs that come into a sawmill go through a quick metal detector before getting cut up, to find oddities like nails and staples. Quote Link to comment
southpawaz Posted January 17, 2012 Share Posted January 17, 2012 There is at least one USGS level run around here where the crew set some marks on stumps of sawed off branches, and a few of the marks were later incorporated into a C&GS level run. One example is CZ0600: "SET IN THE TOP OF A SAWED OFF LIMB OF A PALO VERDE TREE, ABOUT 1 FOOT ABOVE THE GROUND, REF. MARK 2184.0 STAMPED ON A METAL TAG FASTENED TO THE TREE." We didn't find this one, but we did find another from this USGS run that did not get a PID. Quote Link to comment
Z15 Posted January 18, 2012 Share Posted January 18, 2012 (edited) fyi........here is a few that were set here, there are a few more RL1340_U.S. NATIONAL GRID SPATIAL ADDRESS: 16TBS947810(NAD 83) RL1340_MARKER: DB = BENCH MARK DISK RL1340_SETTING: 30 = SET IN A LIGHT STRUCTURE RL1340_SP_SET: MAPLE TREE RL1340_STAMPING: Z 135 1948 RL1340_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY RL1340 RL1340 HISTORY - Date Condition Report By RL1340 HISTORY - 1948 MONUMENTED CGS RL1340 HISTORY - 1955 MARK NOT FOUND USGS RL1340 HISTORY - 20040803 MARK NOT FOUND USPSQD RL1340 RL1340 STATION DESCRIPTION RL1340 RL1340'DESCRIBED BY COAST AND GEODETIC SURVEY 1948 RL1340'10.7 MI SW FROM SILVER CITY. RL1340'ABOUT 2.6 MILES WEST ALONG STATE HIGHWAY 107 FROM ITS JUNCTION RL1340'WITH STATE HIGHWAY 64 IN SILVER CITY, THENCE 4.5 MILES SOUTH ALONG RL1340'THE NONESUCH MINE ROAD, THENCE 3.2 MILES WEST ALONG AN OLD ROAD RL1340'TO THE END OF TRUCK TRAVEL AT A STREAM CROSSING, THENCE CONTINUING RL1340'WEST 0.4 MILE ALONG A TRACTOR TRAIL LEADING TO THE WHITE PINE RL1340'EXTENSION MINE, AT THE JUNCTION OF THE TRACTOR TRAIL WITH THE OLD RL1340'ROAD LEADING FROM NONESUCH MINE TO WHITE PINE EXTENSION MINE, 0.85 RL1340'MILE EAST OF THE CROSSING OF LITTLE IRON RIVER, 48 FEET NORTH OF RL1340'THE CENTER LINE OF THE OLD TRAIL, 10 FEET EAST-SOUTHEAST OF THE RL1340'CENTER LINE OF THE TRACTOR TRAIL, 83.04 FEET NORTH-NORTHEAST AND RL1340'ACROSS THE JUNCTION FROM THE HEAD OF A SPIKE IN THE CENTER OF THE RL1340'TRIANGULAR BLAZE ON THE NORTH SIDE OF A 37-INCH SPRUCE TREE, RL1340'23.17 FEET SOUTHEAST AND ACROSS THE TRAIL FROM THE HEAD OF A SPIKE RL1340'IN THE CENTER OF A TRIANGULAR BLAZE ON THE EAST SIDE OF A 10-INCH RL1340'MAPLE TREE, ABOUT 3 FEET ABOVE THE LEVEL OF THE GROUND AND THE RL1340'TRAIL NORTH AND SET VERTICALLY IN THE WEST FACE OF AN 11-INCH MAPLE RL1340'TREE. NOTE-- PROBABLY DESTROYED BY CONSTRUCTION OF NEW ROAD IN RL1340'AREA. RL1338_U.S. NATIONAL GRID SPATIAL ADDRESS: 16TBS940805(NAD 83) RL1338_MARKER: DB = BENCH MARK DISK RL1338_SETTING: 30 = SET IN A LIGHT STRUCTURE RL1338_SP_SET: BIRCH TREE RL1338_STAMPING: X 135 1948 RL1338_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY RL1338 RL1338 HISTORY - Date Condition Report By RL1338 HISTORY - 1948 MONUMENTED CGS RL1338 HISTORY - 1955 MARK NOT FOUND USGS RL1338 HISTORY - 20040803 MARK NOT FOUND USPSQD RL1339_U.S. NATIONAL GRID SPATIAL ADDRESS: 16TBS946810(NAD 83) RL1339_MARKER: DB = BENCH MARK DISK RL1339_SETTING: 30 = SET IN A LIGHT STRUCTURE RL1339_SP_SET: HEMLOCK TREE RL1339_STAMPING: Y 135 1948 RL1339_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY Edited January 18, 2012 by Z15 Quote Link to comment
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