Changes to the National Geodetic Survey Datasheets (Datasheet95 Program)
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Changes to the National Geodetic Survey Datasheets (datasheet95 program) Version 8.12.5.13 updated on 07/01/2021 There are 4 changes to datasheets in this version: #1: Whenever a user retrieves datasheets with any of the retrieval options (http://www.ngs.noaa.gov/cgi-bin/ds_desig.prl, http://www.ngs.noaa.gov/cgi-bin/ds_pid.prl, http://www.ngs.noaa.gov/cgi-bin/ds_county.prl, http://www.ngs.noaa.gov/cgi-bin/ds_radius.prl, http://www.ngs.noaa.gov/cgi-bin/ds_mm.prl, http://www.ngs.noaa.gov/cgi-bin/ds_quads.prl, http://www.ngs.noaa.gov/cgi-bin/ds_proj.prl, http://www.ngs.noaa.gov/cgi-bin/ds_dates.prl, and http://www.ngs.noaa.gov/cgi-bin/ds_cors.prl), control points that are not publishable will be listed in a report that is appended to the datasheet output after the last datasheet. #2: Whenever a user retrieved datasheets with any of the retrieval options listed in #1, the resulting mark listing sometimes would display duplicates if CORS were in the listing. This was due to a sort order issue. An example of the original issue is shown below. Steps: 1. Go to https://www.ngs.noaa.gov/cgi-bin/ds_mm.prl 2. Enter a MIN_LAT of N380412, MAX_LAT of N382432, MIN_LON of W1041236, MAX_LON of W1042715, leave all other field on their default settings, and then press the [Submit] button. 3. On the next page, scroll down the page until you see CORS with PIDs: AJ6947, DG6994, AJ6949, DJ6995. You will see that they are duplicated as shown below. Datasheet Changes Page : 1 This sort issue has been corrected. Enacting the same steps as above will now display these CORS without duplicates, as shown below. Please note that in the above picture, that PID AJ6947 represents the inactive L1 Phase Center for the ARP with PID AJ6946, and PID DG6994 represents the active L1 Phase Center for the ARP with PID AJ6946. Similarly, PID AJ6949 represents the inactive L1 Phase Center for the ARP with PID AJ6948, and PID DG6995 represents the active L1 Phase Datasheet Changes Page : 2 Center for the ARP with PID AJ6948. All four of these L1 Phase Centers (active and inactive) will never produce a datasheet as L1 Phase Centers are non-publishable. However, they will appear in the reason code report, which is displayed after the last datasheet whenever one uses any of the datasheet retrieval pages. The reason code report for the above datasheet retrieval by area (MIN/MAX LAT/LON) is shown below with the L1 Phase Centers highlighted in green. ----------------------------------------------------------------------------- - This listing contains control for which complete digital - - data sheets where not provided. The complete data sheets were - - not provided for the reason listed below. The reason below is - - associated with a horizontal control Nonpub code shown under - - the heading 'H' and/or a vertical control Nonpub code shown under - - the heading 'v' - - - - The format of the records are as follows: - - Pid = Station Permanent Identifier) - - Name = Station Designation - - Lat = Approx. Latitude (Degrees, Minutes, truncated Seconds) - - Lon = Approx. Longitude (Degrees, Minutes, truncated Seconds) - - O = Horizontal Order - - o = Vertical Order - - H = Horizontal Nonpub Code - - v = Vertical Nonpub Code - - - - H Nonpub HORIZONTAL CONTROL NONPUB REASON - - -------- -------------------------------- - - B Station is a RBN antenna - - C Not a publishable datum within the state - - D No descriptive text available - - I No NAD83 coordinates available, only IGS08 coordinates - - L CORS L1 Phase Center is not publishable - - N No geodetic control - - O Outside NGS publication area - - P Purpose of position is not for network control - - R Restricted position - - T Station is a temporary point/bench mark - - V Station is a VOR antenna - - W Weakly determined position - - X Surface mark reported destroyed - - Y Surface and underground mark reported destroyed - - - v Nonpub VERTICAL CONTROL NONPUB REASON - - -------- ------------------------------ - - C Not a publishable datum within the state - - D No descriptive text available - - F Bench mark not yet adjusted - - N No geodetic control - - L CORS L1 Phase Center is not publishable - - O Outside NGS publication area - - R Restricted elevation - - S Mark is in a subsidence area - - T Station is a temporary point/bench mark - - X Surface mark reported destroyed - - Y Surface and underground mark reported destroyed - - Z Presumed destroyed - - - - - - NOTE - Stations found in this listing may still have a valid - - datasheet produced by use of other publishable values. - - For example, an ADJUSTED height may be non-publishable - - but a good GPS height might be found on the datasheet. - - - - If a mark/control point is in a subsidence area, you can request - - to see suspect heights in the SUPERSEDED SURVEY CONTROL section - - of its datasheet by checking the 'Include suspect heights in - - subsidence area' checkbox on the datasheet retrieval pages. - Datasheet Changes Page : 3 - - ----------------------------------------------------------------------------- Pid Name Lat Lon Elev O o Hv ------ ----------------------------- ---------- ----------- --------- - - -- >CM8556 BUTLER BUTTE AZ MK 38 07 14. /104 17 55. DD >CM8557 BUTLER BUTTE RM 1 38 07 16. /104 17 55. DD >CM8558 BUTLER BUTTE RM 2 38 07 15. /104 17 55. DD >AJ6947 PUEBLO 1 CORS L1 PHASE CENTER 38 17 12. /104 20 43. LL >DG6994 PUEBLO 1 CORS L1 PHASE CENTER 38 17 12. /104 20 43. LL >AJ6949 PUEBLO 2 CORS L1 PHASE CENTER 38 17 13. /104 20 43. LL >DG6995 PUEBLO 2 CORS L1 PHASE CENTER 38 17 13. /104 20 43. LL >DJ3038 PUEBLO 5 CORS L1 PHASE CENTER 38 17 12. /104 20 43. LL >DJ3040 PUEBLO 6 CORS L1 PHASE CENTER 38 17 13. /104 20 43. LL >DF9377 PUEBLO CBL 2 0 38 16 26. /104 26 42. NN >AJ6034 PUEBLO CBL 2 1250 38 16 25. /104 26 27. NN >DF9376 PUEBLO CBL 2 150 38 16 25. /104 26 27. NN >AJ6033 PUEBLO CBL 2 430 38 16 25. /104 26 27. NN >BO8133 TBM 11 38 16 27. /104 26 50. TT >BO8134 TBM 12 38 16 22. /104 25 56. TT >BO8135 TBM 13 38 16 17. /104 25 01. TT >BO8136 TBM 14 38 16 13. /104 24 08. TT >BO8137 TBM 15 38 15 59. /104 22 05. TT >BO8138 TBM 16 38 15 36. /104 20 11. TT >BO8139 TBM 17 38 15 33. /104 19 54. TT >BO8140 TBM 18 38 15 16. /104 17 51. TT >BO8141 TBM 19 38 15 12. /104 17 19. TT >BO8142 TBM 20 38 15 04. /104 16 23. TT >BO8143 TBM 21 38 14 47. /104 14 38. TT >BO8144 TBM 22 38 14 11. /104 13 14. TT >BO8145 TBM 23 38 13 44. /104 12 39. TT #3: TU0920, a control point on Maui, HI, will now display the following text on its datasheet. TU0920.The orthometric height was determined by differential leveling TU0920.and adjusted by the National Geodetic Survey in July 2020 TU0920.holding the tidal station 161 5680 C TIDAL to the 1983/2001 TU0920.tidal station epoch value 1.461 meters. #4: NGS has updated several links on datasheets that are listed below. from: AJ6946.Additional information on MYCS2 is available at AJ6946.https://geodesy.noaa.gov/CORS/coords.shtml ... AJ6946.Click photographs - Photos may exist for this station. to: AJ6946.Additional information on MYCS2 is available at AJ6946.https://geodesy.noaa.gov/CORS/news/mycs2/mycs2.shtml ... AJ6946.Click photographs - Photos may exist for this station. from: AJ6946' ftp://cors.ngs.noaa.gov/cors/README.txt Datasheet Changes Page : 4 AJ6946' ftp://cors.ngs.noaa.gov/cors/coord/coord_14 AJ6946' ftp://cors.ngs.noaa.gov/cors/station_log AJ6946' https://geodesy.noaa.gov/CORS to: AJ6946' https://geodesy.noaa.gov/corsdata/coord/coord_14 AJ6946' https://geodesy.noaa.gov/corsdata/station_log AJ6946' https://geodesy.noaa.gov/CORS Version 8.12.5.12 updated on 03/03/2021 The Observation and Analysis Division (OAD) in NGS has updated the Southeast Texas suspect area to a subsidence area. This means that out of approximately 7500 control points in this subsidence area, only 28 are considered to have valid heights. New leveling and/or GNSS data are required in order to densify the network. Below is a list of the 28 specific control points with valid heights. PID EPOCH AF9521 None AJ8805 None AW0590 None AW0591 None AW0623 None AW0695 None AW1082 None AW1703 None AW5578 None AW5707 None AW7078 None AX2549 None AX2552 None AX2553 None BK1739 None BK1753 None BK1778 None BK2441 None BL0169 None BL0195 None BL0243 None BL0356 None BL0358 None Datasheet Changes Page : 5 BL0389 None BL2014 None BL2015 None BL2340 None DE5999 None Below is a list of all of the existing subsidence/suspect areas in US states/territories. In the table below, the Southeast Texas suspect area is now considered to be an area of subsidence versus a suspect area (changes highlighted in green and red). Dynamic Regions/Subsidence & Suspect Areas State Latitude Range Longitude Range Area Type LA latitude ≤ N303432 longitude ≥ W0912738 Subsidence LA latitude ≤ N304850 W0903401 ≤ longitude ≤ W0912738 Subsidence LA latitude ≤ N310002 longitude ≤ W0903401 Subsidence MS latitude ≤ N320608 W0882650 ≤ longitude ≤ W0910952 Subsidence AL latitude ≤ N312344 longitude ≥ W0880000 Subsidence FL N301743 ≤ latitude ≤ longitude ≥ W0870744 Subsidence N303716 TX N282900 ≤ latitude ≤ W0934000 ≤ longitude ≤ W0961500 Subsidence N303000 (was Suspect) Any control point residing in the Southeast Texas subsidence area, N282900 ≤ latitude ≤ N303000 and W0934000 ≤ longitude ≤ W0961500, that is not one of the 28 control points with a valid height will display “NOT PUB” on the “ORTHO HEIGHT –“ line of their datasheet, as shown below for PID AW1029. AW1029* NAVD 88 ORTHO HEIGHT - **(meters) **(feet) NOT PUB Datasheet Changes Page : 6 In order to designation that a control point is in the Southeast Texas subsidence area, the following message is displayed beneath the “ORTHO HEIGHT –“ line: <PID> **This station is in an area of suspected vertical motion (see below).