Esri GNSS Base Station "GISA" Current Status

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06-12-2020 11:43 AM

Esri GNSS Base Station "GISA" Current Status

Hello GISA Users and others,

 

Esri maintains and operates a permanent GNSS base station named GISA. The station is part of the National Geodetic Survey network of CORS stations. Access to GISA logged data files as well as its real-time data streams is free to the geospatial community. More information on the current status of GISA follows.

The current GISA real-time data streams are listed in the table below.

 

Format

URL

IP

Port

Mountpoint

RTCM Version 3.X

esricaster.esri.com

198.102.63.108

2101

gisar30

RTCM Version 2.4

esricaster.esri.com

198.102.63.108

2101

gisar23

 

 

Please be informed that the NAD83(2011) Epoch 2010.0 coordinates of the GISA base station have been updated as per National Geodetic Survey (NGS) transition to the International GNSS Service (IGS) IGb14 GNSS geodetic reference frame for certain CORS stations (click here for more information). The changes are as follows:

 

New Coordinates (MYCS2) in ITRF2014 epoch 2010.00 and NAD 83(2011,MA11,PA11) epoch 2010.00

GISA NEW coordinates:

Antenna Reference Point(ARP): ESRI GISA CORS ARP (PID = DN5820)

ITRF2014 POSITION (EPOCH 2010.0)                                           

 Computed in Jun 2019 using data through gpswk 1933.                        

     X =  -2419200.985 m     latitude    =  34 04 09.48735 N                 

     Y =  -4703565.705 m     longitude   = 117 13 05.78150 W                

     Z =   3553009.343 m     ellipsoid height =  343.469   m                                                                           

 ITRF2014 VELOCITY                                                           

 Computed in Jun 2019 using data through gpswk 1933.                        

     VX =  -0.0237 m/yr      northward =   0.0098 m/yr                      

     VY =   0.0213 m/yr      eastward  =  -0.0308 m/yr                      

     VZ =   0.0063 m/yr      upward    =  -0.0032 m/yr                      

                                                                                                                                                         

 NAD_83 (2011) POSITION (EPOCH 2010.0)                                      

 Transformed from IGS14 (epoch 2010.0) position in Jun 2019.                

     X =  -2419200.222 m     latitude    =  34 04 09.47436 N                

     Y =  -4703567.027 m     longitude   = 117 13 05.73149 W                

     Z =   3553009.418 m     ellipsoid height =  344.196   m                

                                                                             

 NAD_83 (2011) VELOCITY                                                      

 Transformed from IGS14 velocity in Jun 2019.                               

     VX =  -0.0085 m/yr      northward =   0.0210 m/yr                      

     VY =   0.0216 m/yr      eastward  =  -0.0174 m/yr                      

     VZ =   0.0150 m/yr      upward    =  -0.0043 m/yr                      

 

Old Coordinates (MYCS1) in IGS08 epoch 2005.00 and NAD 83(2011,MA11,PA11) epoch 2010.00 (No longer supported by NGS as of September 1, 2019):

GISA old coordinates:

Antenna Reference Point(ARP): ESRI GISA CORS ARP (PID = DN5820)                 

IGS08 POSITION (EPOCH 2005.0)                                              

 Computed in Feb 2012 using 50 days of data.                                

     X =  2419200.865 m     latitude    =  34 04 09.48617 N                

     Y =  4703565.793 m     longitude   = 117 13 05.77578 W                

     Z =   3553009.314 m     ellipsoid height =  343.472   m                

                                                                             

 IGS08 VELOCITY                                                              

 Predicted with HTDP_3.1.2 Feb 2012.                                        

     VX =  0.0237 m/yr      northward =   0.0096 m/yr                      

     VY =   0.0182 m/yr      eastward  =  0.0294 m/yr                       

     VZ =   0.0080 m/yr      upward    =   0.0001 m/yr                      

                                                                                                                                                       

 NAD_83 (2011) POSITION (EPOCH 2010.0)                                      

 Transformed from IGS08 (epoch 2005.0) position in Feb 2012.                

     X =  2419200.223 m     latitude    =  34 04 09.47463 N                

     Y =  4703567.025 m     longitude   = 117 13 05.73153 W                

     Z =   3553009.427 m     ellipsoid height =  344.200   m                

                                                                             

 NAD_83 (2011) VELOCITY                                                      

 Transformed from IGS08 velocity in Feb 2012.                               

     VX =  0.0084 m/yr      northward =   0.0209 m/yr                      

     VY =   0.0186 m/yr      eastward  =  0.0160 m/yr                       

     VZ =   0.0167 m/yr      upward    =  0.0012 m/yr  

 

ITRF2014 coordinates and velocities and NAD83(2011) velocities are shown for reference. These changes amout to NAD83(2011) Epoch 2010.0 coordinate differences at the GISA ARP of:

 

E = 0.0018 m

N = -0.0082 m

U = -0.0039 m

 

Values are given in meters as “New GISA coordinates minus Old GISA coordinates” in the local-geodetic ENU coordinate system.

 

More information about GISA including accessing stored hourly native or Rinex Version 2.11 data files can be found here.

For more information contact kevin_kelly@esri.com.

Thank you for your interest in GISA.

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