[IGSREPORT-11253] Wk 1266 EMR Analysis Report

Pierre Tetreault pierre at geod.nrcan.gc.ca
Thu Apr 22 13:19:57 PDT 2004


******************************************************************************
IGS Electronic Report   22 Apr 13:20:02 PDT 2004      Message Number 11253
******************************************************************************

Author: NRCan/GSDivision

********************************************************************************
EMR ANALYSIS REPORT GPS-WEEK 1266    Dates: 04apr11  to  04apr17                
********************************************************************************

NRCan (Natural Resources Canada, formerly Energy, Mines and Resources (EMR))
615 Booth Street, Ottawa, Canada K1A 0E9
e-mail: pierre at geod.nrcan.gc.ca, huot at geod.nrcan.gc.ca
tel:    (613)992-2218 (Pierre Tetreault)
	(613)996-4914 (Caroline Huot)
fax:    (613)995-3215

PRODUCTS GENERATED:
The following products are generated and uploaded into CDDIS @ NASA/GSFC
   EMR12660-6.SP3     GPS ephem. files for days 0-6, week #1266 in sp3 format 
   EMR12667.ERP       pole x,y and DUT1 solutions for week #1266
   EMR12667.SNX       station and EOP weekly combined solution in SINEX format
   EMR12667.SUM       name of this text summary file

REMARKS on EMR products:
1. ALGO receiver clock used as reference time. In the sp3 EPH file sat. clock
   correction value of 999999.999999 microseconds indicates that the direct clock 
   comparison with the reference clock is not available (e.g. ALGO not observing
   a satellite). 
   ALGO clock error & drift were about 2910.3 ns (53106) & 25.6 ns/day w.r.t.
   GPS time
 
2.      Date  |  PRN  | Action |     Period     |      Reason
     +--------+-------+--------+----------------+----------------------------+
      04apr13    06       EM    00:00 to 23:45   Ref Nanu 2004048
     +--------+-------+--------+----------------+----------------------------+
     (R)  Satellite was removed from EMR SP3 file.
     (E)  Satellite was excluded prior to processing data.
     (M)  Satellite in maneuver.

SOLUTION CHARACTERISTICS
1. Solution identifier:  Submission 040422
2. Software used      :  GIPSY/OASIS II (UNIX )
3. Definition of Terrestrial frame:
   origin and orientation         :  Nominally IGb00
   reference epoch                :  current date
   GM                             :  398600.4415 km^3/s^2
   gravity model                  :  GEMT3( 8,8) +C21+S21
   ocean loading                  :  Pagiatakis, global_model
4. Solution characteristics:
      undifferenced phase and smoothed pseudorange data for satellite
      elevation > 15 degrees at 5 min. normal point interval; single 
      day (24h) arc with 6 IC and 3 rad. parameters per satellite
5. See IGS Mail#3708 (January 23, 2002), IGS Mail#928 (April 05, 1995) 
   and IGS Report#1488 (January 16, 1995) for more details regarding NRCan
   processing strategy.


CARRIER PHASE / PSEUDO RANGE STATISTICS

Note: F indicates a constrained fiducial site
      E indicates an eclipsing satellite

                             Carrier Phase Statistics
                                 rms (cm) /  # obs  

            04apr11   04apr12   04apr13   04apr14   04apr15   04apr16   04apr17 
          ---------------------------------------------------------------------
ALGO       .40/2415  .41/2429  .41/2346  .44/2425  .41/2424  .45/2421  .49/2406 
ASC1       .64/2791  .60/2101  .76/2576  .63/2728  .64/2692  .00/   0  .00/   0 
AUCK       .50/2248  .46/2166  .42/2121  .42/2253  .43/2257  .45/2259  .41/2255 
BAHR       .58/2583  .57/2503  .56/2494  .52/2579  .64/2577  .51/2562  .57/2473 
CAS1       .44/2652  .45/2462  .45/2222  .46/2566  .43/2532  .45/2441  .55/2503 
CHPI       .51/2496  .63/2422  .51/2317  .50/2306  .55/2487  .58/2233  .53/2400 
COCO       .00/   0  .73/2654  .77/2369  .62/2650  .56/2559  .55/2655  .54/2640 
CRO1       .48/1481  .65/2123  .64/1914  .61/2158  .57/2010  .53/2152  .60/2021 
DAV1       .41/2610  .41/2525  .43/2560  .42/2734  .39/2570  .45/2468  .47/2625 
DRAO       .50/2533  .50/2546  .51/2361  .57/2538  .53/2535  .49/2536  .50/2537 
FAIR       .54/2719  .54/2729  .52/2589  .53/2784  .53/2753  .53/2402  .53/2730 
GOL2       .47/2486  .42/2468  .43/2255  .53/2472  .48/2461  .48/2383  .48/2401 
GOUG       .00/   0  .00/   0  .67/1265  .00/   0  .00/   0  .00/   0  .60/1816 
GUAM       .00/   0  .90/2332  .73/2248  .73/2438  .69/2420  .71/2637  .62/2633 
HRAO       .45/2223  .45/2133  .44/1999  .42/2220  .46/2243  .48/2175  .45/2142 
IISC       .00/   0  .64/2498  .66/2498  .73/2597  .81/2326  .66/2290  .67/1148 
ISPA       .59/2388  .51/2086  .57/2206  .64/2445  .60/2462  .57/2443  .56/2444 
JAB1       .00/   0  .65/2612  .63/2154  .67/2493  .64/2193  .71/2321  .67/2160 
LAE1       .75/2283  .00/   0  .00/   0  .00/   0  .00/   0  .00/   0  .00/   0 
LHAS       .52/2285  .49/2275  .53/2327  .50/1262  .54/1999  .54/2358  .48/2332 
MANA       .70/2021  .68/2403  .67/1594  .80/2252  .65/2539  .62/2552  .64/2539 
MAS1       .43/2401  .46/2430  .50/2342  .65/2437  .52/2424  .43/2412  .44/2405 
MATE       .49/2417  .55/2424  .57/2334  .51/2433  .50/2403  .55/2415  .51/2426 
MAUI       .51/2213  .51/2375  .46/2026  .56/2567  .51/2303  .53/2565  .42/2303 
MCM4       .37/2449  .36/2110  .36/2295  .38/2554  .38/2414  .35/2232  .35/2272 
NKLG       .72/2188  .00/   0  .00/   0  .00/   0  .00/   0  .00/   0  .00/   0 
NRC1       .38/2427  .40/2447  .40/2141  .48/2425  .40/2436  .41/2432  .49/2420 
NRIL       .45/1478  .39/ 918  .43/2389  .43/2671  .46/2811  .46/2561  .45/2847 
PERT       .55/2448  .70/2332  .59/2388  .52/2471  .50/2462  .53/2392  .64/2384 
PETP       .61/1636  .64/2313  .65/2222  .62/2215  .61/2409  .63/2418  .62/2318 
PIMO       .77/2029  .64/1942  .59/1633  .68/1786  .67/1702  .69/2017  .66/2094 
POL2       .48/2392  .45/2378  .48/2422  .47/2518  .48/2514  .49/2508  .50/2468 
REUN       .00/   0  .00/   0  .00/   0  .64/2115  .59/1958  .68/1860  .00/   0 
RIOG       .50/2453  .41/2519  .42/2395  .42/2540  .43/2535  .43/2266  .37/1133 
SANT       .60/2518  .00/   0  .00/   0  .00/   0  .00/   0  .66/2259  .58/2512 
SEY1       .47/ 940  .52/ 736  .43/ 234  .00/   0  .00/   0  .00/   0  .00/   0 
STJO       .42/2491  .41/2438  .42/2251  .48/2349  .60/2439  .61/2506  .50/2425 
THTI       .84/2211  .00/   0  .00/   0  .00/   0  .00/   0  .00/   0  .00/   0 
THU3       .44/2914  .44/2962  .44/2789  .45/2951  .45/2942  .43/2925  .48/2952 
TID2       .57/2407  .54/2405  .51/2261  .50/2325  .53/2398  .70/2158  .60/2432 
TROM       .42/2663  .49/2824  .44/2776  .49/2864  .50/2791  .50/2730  .51/2805 
ULAB       .47/2176  .46/2092  .00/   0  .00/   0  .00/   0  .51/1955  .47/2100 
USNO       .51/2431  .56/2301  .71/1916  .67/2440  .54/2443  .53/2437  .53/2429 
USUD       .52/2230  .52/2433  .52/2165  .51/2408  .53/2404  .54/2417  .54/2422 
VESL       .00/   0  .00/   0  .00/   0  .46/2920  .47/2621  .00/   0  .00/   0 
VILL       .49/2454  .50/2464  .47/2384  .48/2467  .49/2470  .54/2475  .48/2472 
YELL       .47/2493  .45/2577  .46/2458  .45/2637  .44/2617  .45/2362  .45/2528 

PRN01      .52/3052  .51/3165  .53/3299  .53/3419  .50/3358  .54/3409  .52/3228 
PRN03 E    .54/3022  .55/2972  .55/3068  .55/3272  .60/3276  .65/3036  .53/2877 
PRN04      .54/3134  .54/3369  .51/3347  .56/3556  .53/3456  .52/3417  .53/3469 
PRN05      .50/3528  .50/3294  .53/3355  .50/3497  .49/3511  .53/3439  .52/3492 
PRN06      .56/3289  .51/3060  .00/   0  .56/3241  .50/3182  .52/3230  .54/3318 
PRN07 E    .49/3330  .57/3505  .55/3519  .50/3493  .49/3563  .58/3534  .58/3449 
PRN08      .52/3309  .54/3380  .52/3413  .52/3529  .50/3452  .52/3456  .51/3465 
PRN09      .50/3644  .51/3466  .54/3609  .55/3759  .51/3704  .52/3662  .52/3584 
PRN10      .53/3279  .50/3285  .54/3277  .52/3532  .48/3427  .49/3243  .52/3219 
PRN11      .56/3245  .55/3382  .56/3486  .57/3602  .57/3583  .53/3398  .54/3442 
PRN13      .53/3101  .57/3430  .58/3328  .56/3513  .52/3421  .55/3433  .54/3326 
PRN14      .52/3530  .54/3533  .53/3508  .56/3537  .57/3728  .54/3674  .50/3595 
PRN15      .57/3585  .55/3495  .49/3318  .54/3554  .53/3583  .54/3591  .50/3419 
PRN16      .57/3003  .58/3270  .54/3296  .53/3295  .56/3399  .54/3331  .53/3187 
PRN17      .51/3317  .54/3302  .49/3026  .52/3428  .51/3361  .51/3224  .51/3352 
PRN18 E    .52/3812  .49/3132  .53/3654  .55/3686  .55/3807  .53/3674  .51/3628 
PRN19      .62/2509  .61/3128  .60/3247  .61/3349  .62/3319  .61/3235  .57/3069 
PRN20      .53/3293  .56/3339  .55/3469  .54/3497  .50/3389  .56/3586  .54/3429 
PRN21      .51/3436  .51/3206  .51/3177  .53/3372  .55/3452  .53/3378  .52/3411 
PRN22 E    .57/3408  .59/3287  .58/3150  .66/3613  .62/3640  .60/3558  .58/3433 
PRN24      .52/3249  .53/3301  .57/3300  .53/3484  .51/3372  .53/3292  .51/3319 
PRN25      .53/3232  .53/3356  .54/3327  .54/3388  .51/3474  .50/3349  .51/3361 
PRN26      .50/3481  .49/3294  .53/3394  .53/3637  .53/3560  .49/3384  .52/3380 
PRN27      .50/3167  .53/3377  .54/3426  .53/3528  .51/3515  .52/3430  .49/3314 
PRN28      .52/3500  .53/3509  .50/3324  .54/3608  .52/3446  .51/3372  .54/3468 
PRN29      .51/3432  .57/3268  .55/2558  .52/3603  .52/3503  .50/3367  .51/3391 
PRN30      .52/3458  .52/3377  .54/3220  .54/3458  .53/3553  .52/3407  .52/3431 
PRN31 E    .59/3328  .61/3405  .52/2141  .59/3543  .58/3501  .63/3481  .58/3296 


                             Pseudo Range Statistics
                                rms (cm) /  # obs

            04apr11   04apr12   04apr13   04apr14   04apr15   04apr16   04apr17 
          ---------------------------------------------------------------------
ALGO        43/2415   46/2429   39/2346   46/2425   53/2424   52/2421   41/2406 
ASC1         0/   0   64/2101    0/   0   69/2728    0/   0    0/   0    0/   0 
AUCK        50/2248   48/2166   49/2121   48/2253   51/2257   49/2259   49/2255 
BAHR        42/2583   42/2503   42/2494   41/2579   41/2577    0/   0    0/   0 
CAS1        28/2652   28/2462   29/2222   31/2566   29/2532   28/2441   28/2503 
CHPI        49/2496   48/2424   47/2317   47/2306   51/2488   50/2233   50/2400 
COCO         0/   0   30/2657   29/2372   27/2650   30/2559   30/2655   29/2640 
CRO1        47/1481   43/2123   42/1914   43/2160   45/2010   42/2152   45/2027 
DAV1        31/2610   31/2525   30/2560   38/2734   32/2570   32/2468   33/2625 
DRAO        35/2532   35/2545   31/2361   33/2538   35/2534   34/2536   34/2537 
FAIR        33/2719   29/2729   33/2589   40/2784   34/2753   35/2402   41/2730 
GOL2        45/2486   48/2468   44/2249   47/2462   46/2446   45/2372   45/2399 
GUAM         0/   0   56/2335   53/2249   49/2438   57/2421   55/2638   60/2633 
HRAO        18/2223   18/2133   18/1999   18/2220   18/2243   18/2176   18/2144 
IISC         0/   0   65/2498   64/2498   64/2597   63/2329   68/2290   64/1148 
ISPA        28/2388   28/2086   29/2206   28/2445   28/2462   28/2445   27/2444 
JAB1         0/   0   57/2613   58/2154   60/2493   55/2193   57/2321   58/2160 
LAE1        71/2284    0/   0    0/   0    0/   0    0/   0    0/   0    0/   0 
LHAS        34/2285   36/2275   36/2327   35/1262   35/1999   34/2358   34/2332 
MANA         0/   0   73/2401   66/1593   72/2251    0/   0    0/   0    0/   0 
MAS1        27/2401   25/1563   27/2342   26/2437   25/2424   26/2412   26/2405 
MATE        43/2417   45/2424   43/2334   44/2433   43/2403   45/2415   45/2426 
MAUI        39/2213   40/2375   38/2026   40/2567   39/2303   39/2565   38/2303 
NRC1        34/2427   35/2447   34/2141   35/2425   33/2436   35/2432   34/2420 
NRIL        21/1478   21/ 918   21/2389   22/2671   21/2811   22/2561   22/2847 
PERT        41/2448   44/2332   45/2388   41/2471   41/2462   42/2392   41/2384 
PETP        51/1636   49/2313   51/2222   52/2215   51/2409   52/2418   52/2318 
PIMO        26/2032   24/1942   23/1633   25/1786   24/1702   25/2017   25/2094 
POL2        33/2392   34/2378   34/2422   34/2518   35/2514   35/2508   33/2468 
RIOG        36/2453   36/2519   35/2395   34/2540   35/2535   36/2268   35/1133 
SANT        30/2518    0/   0    0/   0    0/   0    0/   0    0/   0    0/   0 
SEY1        44/ 940   47/ 736   46/ 234    0/   0    0/   0    0/   0    0/   0 
STJO        34/2491   34/2438   34/2251   33/2349   33/2439   33/2506   34/2425 
THTI        69/2214    0/   0    0/   0    0/   0    0/   0    0/   0    0/   0 
THU3        45/2914   47/2962   45/2789   46/2951   47/2942   46/2925   46/2952 
TID2        72/2396   71/2405   68/2261   69/2326   71/2369   67/2129   64/2431 
TROM        47/2663   57/2824   43/2776   42/2864   39/2792   44/2730   44/2805 
ULAB        60/2176   59/2093    0/   0    0/   0    0/   0   63/1954   62/2100 
USNO        49/2431   49/2300   49/1917   49/2441   51/2443   52/2437   50/2428 
USUD        35/2230   33/2433   33/2165   34/2408   32/2404   33/2417   33/2422 
VESL         0/   0    0/   0    0/   0   57/2920   42/2620    0/   0    0/   0 
VILL        24/2454   24/2464   26/2384   26/2467   26/2470   26/2475   25/2472 
YELL        38/2493   36/2577   36/2458   38/2637   38/2617   36/2362   38/2528 

PRN01       43/2724   47/2998   43/3045   45/3197   42/3086   44/2986   45/2822 
PRN03 E     37/2710   44/2885   37/2858   42/3091   39/2918   40/2647   41/2529 
PRN04       43/2805   44/3230   42/3122   43/3315   40/3117   42/2981   42/3031 
PRN05       39/3085   41/3237   37/3139   43/3402   39/3233   40/3077   41/3125 
PRN06       42/2983   44/2984    0/   0   40/3110   39/2844   43/2768   40/2804 
PRN07 E     39/3075   43/3415   42/3316   43/3337   41/3228   42/3117   40/3022 
PRN08       42/3028   42/3255   38/3186   40/3374   40/3185   42/3065   41/3057 
PRN09       38/3312   42/3382   38/3333   43/3619   37/3303   39/3247   41/3188 
PRN10       45/2920   48/3138   42/3018   45/3280   45/3028   43/2796   45/2777 
PRN11       41/2927   44/3291   43/3309   46/3467   44/3291   43/3105   42/3137 
PRN13       46/2789   49/3248   45/3085   46/3290   46/3091   46/2996   45/2946 
PRN14       40/3155   42/3463   42/3307   43/3408   39/3346   40/3220   40/3143 
PRN15       43/3317   44/3442   37/3141   43/3438   41/3274   42/3155   45/2991 
PRN16       43/2702   46/3148   42/3072   44/3103   43/3077   43/2886   44/2774 
PRN17       40/2813   45/3169   42/2760   44/3247   40/2968   41/2765   39/2824 
PRN18 E     41/3343   45/3056   39/3391   43/3564   40/3384   41/3232   41/3148 
PRN19       57/2346   53/3035   51/3026   57/3190   53/3002   48/2920   49/2772 
PRN20       45/2960   43/3225   43/3275   44/3319   41/3109   43/3209   42/3076 
PRN21       40/3045   45/3096   40/2902   43/3266   40/3060   42/2916   41/2913 
PRN22 E     39/3026   42/3245   40/2963   43/3498   38/3238   39/3148   39/3015 
PRN24       41/2950   44/3149   39/3042   41/3243   40/2988   40/2822   39/2851 
PRN25       36/2980   41/3267   41/3112   43/3220   39/3128   40/3002   39/2904 
PRN26       42/3085   43/3168   42/3142   40/3436   39/3193   39/2968   37/2988 
PRN27       45/2870   45/3248   38/3191   42/3365   44/3204   44/3029   39/2921 
PRN28       45/3159   45/3378   45/3098   46/3472   42/3116   45/3023   43/3058 
PRN29       39/3048   42/3148   38/2340   42/3407   39/3134   40/2949   40/2975 
PRN30       40/3009   44/3309   39/2978   44/3282   41/3156   41/2915   40/2998 
PRN31 E     46/3053   45/3307   41/1947   45/3377   43/3191   43/3146   40/2955 


                         Station Clock Offsets Solution for 0h UT
                               (microsecond / sigma in ns)

       04apr11   04apr12   04apr13   04apr14   04apr15   04apr16   04apr17  sig 
       ------------------------------------------------------------------------
ALGO       REF       REF       REF       REF       REF       REF       REF   --
ASC1       ---    !!ms!!       ---   32.0616*      ---       ---       ---   .3
AUCK   -2.9899*  -3.0105*  -3.0484*  -3.0776*  -3.1109*  -3.1343*  -3.1389*  .2
BAHR   93.4493   93.4188   93.3820   93.3499   93.3179       ---       ---   .2
CAS1   -2.9153   -2.9249   -2.9573*  -2.9937   -3.0106   -3.0409   -3.0772   .3
CHPI   -2.9763   -3.0085   -3.0365   -3.0562   -3.0719   -3.1011   -3.1181   .3
COCO       ---   -2.9382   -2.9800   -2.9964   -3.0121   -3.0513   -3.0681   .2
CRO1   -2.9550   -2.9827   -3.0215   -3.0637   -3.0679   -3.0971   -3.1232   .3
DAV1   -2.9222   -2.9341   -2.9664   -3.0030   -3.0006   -3.0489   -3.0682   .2
DRAO   27.7663   27.7073   27.6458   27.5871   27.5261   27.4655   27.4043   .2
FAIR  938.9049  938.8797  938.8538  938.8259  938.8000  938.7770  938.7493   .2
GOL2   -2.2352   -2.2657   -2.2959   -2.3264   -5.3379   -5.3670   -3.9787   .5
GUAM       ---   -3.0348   -3.0581   -3.0713   -3.1058   -3.1307   -3.1586   .3
HRAO  983.5206  983.4138  983.3072  983.2009  983.0948  982.9890  982.8821   .3
IISC       ---   -2.9848   -3.0228   -3.0443   -3.0777   -3.0996   -3.1333   .2
ISPA   -3.0212   -3.0325   -3.0477   -3.0880   -3.1084   -3.1484   -3.1900   .2
JAB1       ---   -3.0393   -3.0434   -3.0626   -3.0868   -3.1319   -3.1454   .2
LAE1   -3.0095*      ---       ---       ---       ---       ---       ---   .4
LHAS   -2.9033   -2.9413   -2.9758   -2.9891   -3.0113*  -3.0462   -3.0621   .4
MANA       ---  371.5801  459.7820   10.2996       ---       ---       ---   .2
MAS1  144.7369  144.6312  143.9115  143.8025  143.6708  143.5517  143.4295   .2
MATE   76.7673   76.6587   76.5490   76.4403   76.3290   76.2182  265.2258   .3
MAUI   -3.0455*  -3.0561*  -3.0938*  -3.1150*  -3.1505*  -3.1827*  -3.1978*  .2
NRC1   -2.8953   -2.9206   -2.9466   -2.9716   -2.9972   -3.0221   -3.0478   .2
NRIL   -2.9823   -3.0041   -3.0316   -3.0673   -3.0939   -3.1194   -3.1325   .3
PERT  978.0597  977.8065  977.5359  977.2675  976.9937  976.7155  976.4456   .2
PETP   -2.9915*  -3.0062*  -3.0320*  -3.0571*  -3.0794*  -3.1171*  -3.1288*  .2
PIMO   -3.0135   -3.0374   -3.0730*  -3.0856   -3.1123   -3.1418   -3.1671   .6
POL2   -2.9601   -2.9845   -3.0148   -3.0425   -3.0711   -3.0918   -3.1155   .2
RIOG   -2.9882*  -3.0074   -3.0374   -3.0609   -3.0920   -3.1075       ---   .2
SANT  951.0081       ---       ---       ---       ---       ---       ---   .2
SEY1   19.1233   23.1108       ---       ---       ---       ---       ---   .5
STJO   -2.1755   -2.1889   -2.2030   -2.2160    -.0443    -.0569    -.0719   .2
THTI  623.1000       ---       ---       ---       ---       ---       ---   .2
THU3   -2.9820   -3.0136   -3.0268   -3.0443   -3.0850   -3.1012   -3.1277   .2
TID2   -2.2330   -2.2669   -2.3019   -2.3354   -2.3692   -2.4030   -2.4367   .3
TROM   -2.9108   -2.9434   -2.9821   -3.0014   -3.0342   -3.0601   -3.0770   .2
ULAB   -2.9376   -2.9223       ---       ---       ---   -3.0379   -3.0799*  .5
USNO   -2.2573   -2.2834   -2.3103   -2.3360   -2.3626   -2.3881   -2.4149   .2
USUD   -2.9800   -3.0107   -3.0204   -3.0444   -3.0699   -3.0948   -3.1126   .3
VESL       ---       ---       ---  786.0811  944.1641       ---       ---   .2
VILL  817.3203  816.7836  816.2343  815.7024  815.1480  814.5937  814.1121   .2
YELL   -2.8033   -2.8245   -2.8472   -2.8675   -2.8887   -2.9093   -2.9305   .3
  
  
Notes: * indicates epoch other than 0h UT
       Sig are sigmas, in ns, averaged over 7 days
       !!ms!! indicates offsets greater than 1 millisecond
 
global: ALGO ASC1 AUCK BAHR CAS1 CHPI COCO CRO1 DAV1 DRAO FAIR GOL2 GOUG GUAM
global: HRAO IISC ISPA JAB1 LAE1 LHAS MANA MAS1 MATE MAUI MCM4 NKLG NRC1 NRIL
global: PERT PETP PIMO POL2 REUN RIOG SANT SEY1 STJO THTI THU3 TID2 TROM ULAB
global: USNO USUD VESL VILL YELL
--

Geodetic Survey of Canada
Ottawa, Ontario, Canada
Internet: pierre at geod.nrcan.gc.ca






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