Asian Surveying & Mapping
Breaking News
Israeli indoor UAS system submitted to US Special Ops Command for evaluation
Israel's Robotican, based in Omer, has successfully delivered its...
Chinese mapping tech firm Luokung makes $32.8 mln direct share offering
Chinese mapping technology company Luokung Technology Corp said on...
Luokung Announces eMapgo Signs Cooperation Agreement with Microsoft for Launch of Autonomous Driving Services
BEIJING - Luokung Technology Corp. (NASDAQ: LKCO) ("Luokung" or the...
SLA launches OneMap3D; signs MOUs with PropNex, Ninja Van and Kabam to further the use of OneMap
SINGAPORE (EDGEPROP) - Singapore Land Authority (SLA) has launched...
Agrowing and Senseacre Labs partner for enhancing aerial remote sensing from NDVI to Deep Learning AI Precision Agriculture” solutions in India
MADHAPUR, INDIA AND RISHON LEZION, ISRAEL Senseacre Labs, selected...
Singapore Geospatial Festival 2021
Virtual line-up of geospatial interest and capabilities, knowledge-seeding by...
ISRO Invites Applications from Students for Two-week Free Online Course on Remote Sensing and GIS Technology
ISRO, through its centre the Indian Institute of Remote...
Rajnath Singh unveils South Asia’s largest Genomics research centre in Hyderabad
Hyderabad: Nucleome on Thursday unveiled South Asia’s largest and most...
New satellite system could improve Australia’s water quality management
An analysis carried out by the University of New...
China launches twin satellites capable of creating 3D maps in space
China has been busy in 2021 as it ramps...

July 21st, 2011
Secret WWII Underground Bunkers and Tunnels Mapped with ProMark 100 GNSS Receiver

 
Parkes main tool is historic aerial photography, coupled with hours of research in the National Australian Archives and the National Library of Australia. To that he adds geophysical surveys of the infrastructure.  Parkes is undertaking the geophysical surveying and mapping using an Ashtech ProMark™ 100 GNSS receiver and a Willy Bayot PPM Mk 3 magnetometer. 
 
Parkes runs the two units in parallel later processing both data sets. Parkes says, “it is absolutely critical that the GNSS receiver and magnetometer keep in synchronization during data collecting runs including under the frequently encountered tree canopies.” To improve accuracy, he avoids using RTK as “that would involve have another electronic device operating and emitting more noise in the signal spectrum.”  
 
The dual constellation, GPS and GLONASS, reception of the ProMark 100 is essential to the success of Parkes’ work. After more than a hundred data collection passes with the magnetometer and ProMark 100 through groves of trees, at no time did the PDOP rise to more than three and at all times there were more than eight satellites available. The ProMark 100 data is post-processed to improve accuracy. Parkes notes that ironically many of the most interesting finds have been collected under heavy tree canopy. Without the quality of the geographic positions enabled by the ProMark100 under tree canopy, Parkes reports that much of his work would have been impossible to achieve. 
 
In fact, when Parkes first began the project he used a single-constellation GPS system and post processed the results against the local International GNSS Service (IGS) reference station. The GPS only system worked very well until a grove of trees would interfere with the sky. Now with the ProMark 100 GNSS receiver, Parkes surveys using GPS L1 and GLONASS in continuous kinematic mode at a one second collection rate. He then post processes the data against another ProMark 100 used as a local reference station. To date, Parkes has mapped an underground railway, artillery observation posts, several shelters, fuel terminals and other yet to be identified pieces of the vast infrastructure. 
www.ashtech.com