Thursday, 17 December 2009

Technical and Sales Training for Carlson Software Products

Training was conducted at our Puchong office by Mr Michael Manning on 14-16/12/2009. Michael is currently the Director of Carlson Software Australia and the Sales Representative for Australia, New Zealand and Pacific countries.


JPSurveys is appointed as a reseller of the Carlson range of products in Malaysia and its surrounding region since early July 2009. Products currently available include:-
  • SurveCE: a powerful data collector software running on handheld/mobile devices for GPS/GNSS receivers and total station
  • Carlson Survey, Carlson Civil, Carlson Hydrology, Carlson GIS .. : a range of versatile desktop and high productivity software and tools for the most demanding tasks. They come with build-in IntelliCAD and hence are priced very competitively.
  • Carlson Mini, Carlson Surveyor: Tough, Durable and Easy to Use Field computer/Data logger/Controller
Wide range of versatile, powerful software tools and solution from Carlson:



Sample screenshots of the Carlson SurvCE software running on field/mobile devices:







Contact us for more information.



Thursday, 10 December 2009

Interview with Steve Ault (Part 4 of 4: Advice for GNSS users and SF3050 users)

This is the last segment of a 4-part series of interview questions posted to Mr Steve Ault, the Technical Support Manager of Navcom Technology, Inc., who conducted training for our sales and field personnel in early November 2009.
---
PointsandPixels: What is your advice to users, p especially in their early stages of adapting GNSS technology?

Steve: In terms of learning, maintaining and troubleshooting their GNSS equipment, users should keep in touch with their Navcom dealers (or regional channel partners like Jurukur Perunding) to keep abreast of new features and process improvement techniques throughout the life of the product. They should also be familiar with the Sapphire Technical Reference Manual which contains input and output message structures of the SF-3050. All Navcom manuals are available as downloads on the NTI website.

Sometimes troubleshooting tips and common interfaces are documented in the Navcom Troubleshooting Guide. For example, there is a section which describes the logging of data to external flashdrives using Carlson SurvCE.



"A properly maintained SF-3050 will provide many years (or decades) of service"
The physics of GNSS signalling is important. If it is necessary to use cables other than those provided by Navcom, users should also read the Product User Guide to avoid making integration mistakes. As always, Navcom and its dealers are available to answer integration enquiries and provide appropriate guidance.

As for any piece of expensive electronic equipment, the user should take care of accessories in particular the antennae. Positioning performance is based on antenna phase center and damage, if any, to the antenna would cause internal elements to move and thereby affecting its intended performance. A properly maintained SF-3050 will provide many years (or decades) of service.

---
PointsandPixels: Any other parting remarks?

Steve: I look forward to many more years of service to the Malaysian market. We welcome feedback from end users (and channel partners) regarding our product performance, innovative ideas and methods of which you (the end users) have put Navcom equipment to work.


Related posts /resources:

1. Interview with Steve Ault Part 1/4: His experience with GNSS/RF, history and future trend of the industry
2. Interview with Steve Ault Part 2/4: Navcom Technology Inc and SF-3050
3. Interview with Steve Ault Part 3/4: Starfire
4. StarFire data sheet in pdf format
5. Navcom SF3050 multi frequency GNSS receiver data sheet in pdf format. 

Contact us for more information.

Tuesday, 8 December 2009

Interview with Steve Ault (Part 3 of 4: Starfire)


This is the third segment of a 4-part series of interview questions posted to Mr Steve Ault, the Technical Support Manager of Navcom Technology, Inc., who conducted training for our sales and field personnel in early November 2009.


PointsandPixels:s: What is StarFire?

Steve: In a traditional RTK system, corrections generated and applied are 'land-based'. In other words, correction measurements are based on singular ground antennae. While providing highly accurate correction data for very localised areas, the impact from spatial de-correlation makes systems such as StarFire very attractive.

StarFire is a 'space-based' correction format. This means that corrections are generated for actual satellite orbit position and satellite clock for all GPS (and, in the near future, all GLONASS) satellites. This is not the same for an RTK solution (as RTK base corrects pseudo-range measurements from the satellites under track).


There are two major elements as to how the StarFire process is accomplished.The First is how corrections are created and the second is how these corrections are applied by the navigation processor.Considering that a single satellite is tracked by multiple reference stations on the earth surface, each point sees exactly the same satellite signal but with the normal satellite position, satellite clock, pseurorange, ionospheric and other errors as a traditional base reference station. Each reference station provides its satellite measurement data and position to a central processing computer. The computer takes the data from all reference stations that 'see' the same satellites and computes corrections for the satellite orbit and clock. These can be calculated since the ionospheric differences and other range measurement errors can be filtered.

The second component is the navigation software or algorithms to properly apply the StarFire correction message. Since the processing computer generates a single global correction for each and every satellite, the receiver needs to 'understand' this unique message and how to properly employ it (some of which includes filtering techniques to achieve the final attainable accuracy levels of less than 10cm!).

PointsandPixels: What is the current performance of StarFire?

Steve: StarFire performance can be expressed in several way. These include convergence, accuracy, sustainability, QuickStart and RTK-Extend.

Convergence: This is the time it takes to achieve the published specifications. In our previous product lines(i.e. the Legacy code), this typically required between 30 to 45 minutes of uninterrupted operating time. While for the SF-3050(i.e. Sapphire code), the same specification exists with a noticeable improvement (~20minutes) as tabulated below.

Accuracy: It is determined by the number of satellites being tracked and used in the navigation algorithm. Their relative geometry and the length of time that StarFire corrections have been continuously applied to the navigation solution (as depicted above). The accuracy specifications of less than 10cm (horizontal) is a 24-hour 1-sigma calculation. StarFire typically produces results in the 6-8cm range quite reliably.

Sustainability: This is achieved via continuous GPS signal tracking (in much the same way as RTK performance requires continuous signal tracking). Once the receiver drops out of navigation (e.g., the receiver traverses under a bridge), the convergence period begins all over again because the receiver will have different satellite phase signal characteristics once the signals are re-acquired.

QuickStart: This is a method of attaining the less than 10cm accuracy without going through the full convergence period (as described above). The receiver can be within the performance specifications in less than 5 minutes if the QuickStart function is initiated from a precisely known point. Information on this can be found in the StarUtil-3000 User Guide on our website.

RTK-Extend: This is a unique Navcom patented technique that combines RTK and StarFire technologies to extend the 'footprint' in areas where RTK telemetry tracking proves difficult. When a user is performing an RTK survey, the receiver also tracks the StarFire satellites. If the RTK correction link is interrupted, the receiver can coast on the StarFire correction signal for up to 15 minutes from a Navcom proprietary correction and up to 7 minutes on CMR(+) or RTCM correction from a Navcom base.

Related posts/other resources:

1. Interview with Steve Ault Part 1/4: His experience with GNSS/RF, history and future trend of the industry
2. Interview with Steve Ault Part 2/4: Navcom Technology Inc and SF-3050
3. StarFire data sheet in pdf format.

Contact us for more information.









Thursday, 3 December 2009

Interview with Steve Ault (Part 2 of 4: Navcom & SF-3050)



This is the second segment of a 4-part series of interview questions posted to Mr Steve Ault, the Technical Support Manager of Navcom Technology, Inc., who conducted training for our sales and field personnel in early November 2009.

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PointsandPixels: Who is Navcom Technology, Inc.?



Steve: The founders of Navcom Technology, Inc., (NTI) were pioneers in the GPS industry. Most of them worked for Magnavox GPS research and development for more than a decade before joining NTI. In fact, some of them even worked on the old Transit satellite system and Omega rover navigation system primarily used in commercial marine and military applications.


Some members of our research and development team have spent more than half a century in the fields of surveying, navigation, and geodesy instrumentation. Their experience is propagated to a much younger and culturally diversed group of engineers coming from different countries around the world.


---
PointsandPixels: What is your connection with John Deere, Inc.?




Steve: NTI is a wholely-owned subsidiary of John Deere, Inc. (JDI). While one can read about the successful relationship cultivated and merged by the founders of JDI, the depth of knowledge and experience within this industry seems nearly as old as JDI itself. Just like John Deere, the Navcom brand holds high performance standards and expectations, builds reliable and durable products and works closely with its dealers and channel partners to ensure that customer issues are addressed appropriately.


---
PointsandPixels: The latest offering by Navcom are the SF-3050 GPS/GNSS Receivers. What is so special about these machines?



Steve: The SF-3050 has incorporated many innovations of previous generations of GPS technology. To name a few, ethernet and USB high speed data ports, bluetooth interoperability, increased internal memory and new GUI design have helped to fulfill the needs of present day applications.




...like John Deere, the Navcom brand holds high performance standards and expectations, builds reliable and durable products and works closely with its dealers and channel partners...

ASCII command interface is easy to understand and this makes configuration of receivers very flexible. The StarUtil-3000 GUI program provides a tool for parsing binary data to ASCII format (which allows further analysis to be carried out in spreadsheets).


The scalable software features makes the SF-3050 a very economical product to systems integrators as well. Customers can start off with low-cost receivers and, as time for integration and testing comes, upgrade to higher levels of capability to help control integration costs. This is a benefit not inherently obvious in this product.


Tools for integrating third-party applications (such as Carlson SurvCE and Grade) were co-developed leading into its production. Also included in the SF-3050 toolbox is the Rinex conversion utility which allows users to user SF-3050 data in most currently available post-processing programs.
---


Related posts/links...
1. Interview with Steve Ault. Part 1/4: His experience with GNSS/RF, history and future trend of the industry
2. SF3050 data sheet/brochure in pdf file.



Contact us for more information.












Monday, 30 November 2009

Interview with Steve Ault. Part 1/4: His experience with GNSS/RF, history and future trend of the industry

This is the first segment of a 4-part series of interview questions posted to Mr Steve Ault, the Technical Support Manager of Navcom Technology Inc. who conducted training for our sales and field personnel in early November 2009.

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PointsandPixels: We understand that you have many years of experience in the field of Global Positioning System (GPS) / Global Navigation Satellite System (GNSS) and Radio Frequency (RF) and have been to many places implementing positioning and related solutions. Tell us something about yourself. How did you get involve in this industry?

Steve: My career started with 6 years of service in the US Air Force as a radio technician in the early 80’s. I troubleshot and repaired a wide variety of voice and data radio equipment operating in the VLF to SHF frequency bands.

In 1990, I hired on with Magnavox at about the time when they were introducing the world’s first 6-channel L1 only parallel GPS receivers. During my time with Magnavox, I worked as a Field Engineer and did some work on dual-frequency systems and early DGPS techniques, but my department focus was on commercial and marine applications so that exposure was limited. I left after 3 years to work as a Systems Engineer for a satellite communications company.


In 1995, I hired-on with Leica as a Field Engineer, where my dual frequency experience broadened. In early 1998, I installed, tested and trained personnel on 5 Beacon DGPS systems for the Chinese Maritime Safety Administration, just as I had for other foreign government agencies over the previous year.I then worked as an Applications Engineer for a cell phone infrastructure company in 1998. My role allowed me to work with network RF design engineers from Verizon, AT&T, Vodafone, Sprint and other international cellular companies to help properly design their networks with multicarrier power amplifiers, antenna arrays, and other RF equipment which we manufactured. They interfaced with Nokia, Motorola, Lucent, and Erickson base stations.


Eventually, I joined NavCom in 2006 and I have been managing the Product Support group for the past two and a half years. In that time, I have overhauled the entire product line user documentation, created on-line troubleshooting and analysis tools, expanded the training offerings, and closed development gaps with channel partners. I have been fortunate in that my professional travels have taken me to 4 continents, including 25 countries and 48 US states (incidentally, I was stationed in Italy for about 3 years during my military service). I'd like to think that the diversity in the cultures I have experienced and the broad background of technical fields in which I have worked have made me uniquely qualified to service NavCom’s international customer base.

---
PointsandPixles:How far do you think the GNSS and related technology has progressed since the day you joined the industry?

Steve: When I first entered the arena in 1990, most receivers were single or dual channel sequencing ones. Sequencing receivers are virtually unheard of today. They operated with one channel hopping or sequencing through 4 to 8 satellites for navigation. The second channel was used for house-keeping, collecting almanac, ephemeris and searching for new satellites as they ascended over the horizon.


Due to this technique, there was no ability to track satellite phase and kinematic GPS was not possible. Even with the introduction of parallel receivers in the late 90's, obtaining sub-metre accuracies was a big goal. The focus was on improving code development and the thought of doing real time field work with radio modems was in its infancy stages of development.
...we can anticipate that improvements in rover accuracy and convergence times from space based augmentation systems will continue to improve significantly...

By 1993, and with Selective Availability (SA) turned on, developing DGPS systems that could attain a few metres of accuracy and a broadcast system (which became the Beacon DGPS system) was the focus. In the mid to late ‘90’s, much of the work focused on multipath mitigation, due in part to the vast improvements over the years in code navigation techniques. The technology had advanced to the point where improvements on the centimeter level were crucial. With this came the dedicated dGPS co-development efforts of radio modems and early attempts to provide regional DGPS augmentation systems (WAAS) by government agencies (FAA).

With the advent of choke ring antennae and antenna ground planes, and with the deactivation of SA, the last decade 'turned back' to software development with an emphasis on phase measurement improvements and privatization of satellite DGPS augmentation systems such as StarFire.

---
PointsandPixels: How much further do you think this can go?


Steve: Going forward, we can anticipate that improvements in rover accuracy and convergence times from space based augmentation systems will continue to improve significantly. Traditional RTK accuracy performance currently meets the market need, but could see range expansion if supporting radio modem technology for longer RF path loss. RTK networks typically end at suburban boundaries and today’s market necessitates having alternative telemetry systems to reach beyond these boundaries.


Supporting technologies (like NavCom’s RTK-Extend) will continue to emerge. This will extend the reach of RTK-like technology to new limits and, possibly, open up new application areas. Such capabilities will improve the user productive time and ease the work-flow processes, particularly as new GNSS technologies are adapted into the next natural market segment (namely, Machine Control).
---


Friday, 9 October 2009

Watch Our Presentation on YOUTUBE!



As mentioned in my earlier post on my presentation titled "Satellite Imagery & Elevation Data for Malaysian Road Engineers" to the Road Engineering Association of Malaysia (REAM) at their Library Talk on 8 August 2009, the whole presentation was video-taped and is now available on YouTube!

Please click the following links for the 10-part series:

http://www.youtube.com/watch?v=m_3op7f0Uho - Part 10

For further information, please contact us.

Thursday, 8 October 2009

Navcom GPS/GNSS & StarFire Technical Training

Conducted from 29th September to 1st October, this long awaited exposure fulfilled part of the stringent requirement of Navcom Technology Inc. for their authorized dealers to be equipped with in-depth technical knowledge of the products and solutions that are being offered for the region market.

This particular round of briefing was subsequently scheduled to coincide with both the official release of the latest SF3050 multi frequency GNSS receiver and the arrival of the first two units at our Puchong office  in Malaysia.

The trainer, Mr Steve Ault, happened to be Navcom's Product Support Manager. Backed with decades of knowledge and experience in GNSS and RF technologies, Steve was more than qualified to provide intense yet personal hands-on training for about a dozen of our sales/technical support staff and field surveyors. With the newly acquired knowledge and dedication, we shall now work towards providing excellent customer support to purchasers of the Navcom range of GPS/GNSS products such as the SF3050 and Starfire SBAS service.

About the SF3050 and Starfire: Besides various standard positioning modes (such as cm-accurate RTK and high precision static survey), these receivers with built-in Starfire global high accuracy real-time differential GNSS service can also determine in real real-time at decimetre level accuracy  X/Y and Z positioning of points at any location and time around the world without having a need for a base station. Obviously, this capability will be a great help in many survey and mapping works. By removing base station and post-processing work, it  can only means greater productivity gains, smoother work flow, increased freedom, convenience and work satisfaction for your field and project teams. It has also opened up avenues of new applications, some of which had not been thought of previously especially in the local market context.
Contact us for a presentation or demonstration.

Friday, 2 October 2009

Hong Kong Institute of Surveyors Study Tour

Our office was honoured with a technical visit by the Young Surveyors Group of the Hong Kong Institute of Surveyors on 2nd October, 2009. This group of about thirty young professionals was led by the YSG Vice Chairman, Mr Jeffrey C. H. Wong.
The visitors (consisting of quantity surveyors, property consultants and valuation surveyors, building surveyors and general practice land surveyors) were briefed on selected topics of interest, namely, local West Malaysian licensed land surveying practices, the array of products & services currently being offered by our company, and advances that are being applied in our line of geomatics work. Their visit ended with a tour around our office complex.

Thursday, 3 September 2009

ISO 9001:2008 Certifications for Branches

Management of the JPSurveys Group of Companies congratulates its branches (located in Pulau Pinang, Ayer Keroh and Alor Setar, respectively) for achieving ISO certifications:-
and

Credit goes to the following Branch Managers, their QDCCs and staff:-
Sr Geh Thuan Hooi (Kedah);
Sr Mahadi bin Suboh (Melaka); and
Sr Raja Ahmad Kahar bin Raja Ariff (Penang).

Tuesday, 25 August 2009

ISO 9001:2008 Certification


We are happy to announce that Jurukur Perunding Services Sdn Bhd and Jurukur Perunding World Service Sdn Bhd are now jointly recertified by Sirim QAS International Sdn Bhd based upon the revised version of the Quality Management System Standards. The multi-site certification awarded to our Selangor-based headquarters and selected regional branches in Peninsular Malaysia is a unique achievement for a Malaysian land surveying company.
The demonstration of conformity to the requirements of ISO 9001:2008 is evidence of continual improvement in our provision of land cum hydrographic surveys and services relating to aerial mapping, Geographical Information Systems, remote sensing and geomatics to new and existing customers (or clients).
Credit shall be given to the various divisional General Managers, their QDCCs and staff. The management of the JPSurveys group of companies also appreciates the effort of the Quality Management Unit (QMU) regarding its certification endeavour since late 2002. The QMU comprises the Quality Management Representative (Sr Mr J.Chong Teck Lee), the Quality Document Control Coordinator (Miss Estellita Crispin) and a pool of qualified internal quality auditors from the various divisions and branches. Last, but not least, we would also like to thank our ISO Advisor (Dr Loo Koi Sang) for his contribution and support.

Sunday, 9 August 2009

Satellite Imagery & Elevation Data for Malaysian Road Engineers

Our road engineers have always been an early adopter of new mapping products in the route selection and preliminary design stage of their highway construction process. On August 8, 2009, I was honoured in being invited by the Road Engineering Association Malaysia (REAM) to deliver a talk during their "Library Talk" session.

A 60-minute presentation on the above caption and interaction with the engineers was definitely a satisfying experience, even though it is somewhat uncommon thing for me to do on a Saturday morning. The entire proceeding was video-taped and I was told it will be uploaded to YouTube soon. I will link it to this blog for your viewing pleasure as and when it becomes available.

A summary of the talk is as follows:

From the line maps produced by analogue photogrammetric means in the early '80s to the fully digital line maps produced by analytical plotters in the late '80s, road engineers have followed closely the technology highway to ensure that the highways they planned and designed in Malaysia are done in an efficient manner.

Digital aerial orthophoto maps of the '90s were the first examples of digital images known to the road engineering fraternity. In 2000, the 1m high-resolution satellite IKONOS image became available. Over the years, it establishes itself as the "mainstream" data for route selection and preliminary design of proposed highways in Malaysia. There is no looking back after that.

With the introduction of new Geoeye1 0.5m resolution and RMSE 3m satellite images, road engineers can now reap the benefits of detail and accuracy that space technology has to offer. For the moment, the leap in accuracy from 25m (of IKONOS) to 3m (of Geoeye1) has definitely quench the current thirst for accurate planning data.

In contrast with the progress made in image resolution and geometric accuracy of satellite-based images, little has changed in the availability of uniform and complete elevation data in Malaysia. The only "nationwide" elevation data available in this country was the contour lines derived from 1:50,000 scaled topo sheets produced by the national mapping agency since the '80s. The NEXTMap Malaysia IFSAR elevation data set is now ready to be "the data of choice" over the next few years.

The combination of Geoeye1 satellite image and IFSAR elevation data (mixing better detail with accuracy) now caters for most preliminary planning and design requirements of road projects. Who knows what technology can bring over the coming years. 3D terrain visualization is the logical next step in the merging of the two different sets of data for us (imagine having the whole project site in 3D in front of you, giving a better understanding and presentation of the ground condition in the comfort of an office environment is something you road engineers had wanted all this while, right?). Road design and development is getting more easy and affordable, all thanks to the much improved availability of image and elevation data.

Written by: Kong Hin Yew

Wednesday, 5 August 2009

Pansharpening of Orthorectified Radar Image

The launching of the NEXTMap Malaysia products has generated a lot of interest in the country. This is understandable. Having a nationwide coverage of high-resolution elevation data has put Malaysia into the forefront as only a handful of countries in the world have such a "privilege". The potential of this set of elevation data is undeniably high. However, many overlook the usefulness of the accompanied image file called the Orthorectified Radar Image (ORI).

ORI at 1.25m over Tawau, Sabah.

ORI, as the name implies, is an accurate image which is orthorectified! Having an accuracy of RMSE 2m, it can be used in many applications. 2D and 3D feature extraction is one application that may interest many. Another area of interest will be in the use of ORI as a reference data to geometrically correct other images of lesser accuracy, thus avoiding the need to collect Ground Control Points (GCP) in the field.


Zoom-in of 1.25m ORI

Unfortunately, as with all other radar images, ORI shares the same disadvantage in being difficult to be interpreted. This has somehow discourages users from utilizing it to its full potential. In order to enhance its usefulness, we can actually "colourize" the ORI. By applying a technique called Pan-sharpening, a black and white ORI can be processed to "become" a color image.

Pan-sharpening is an image processing technique where a high-resolution panchromatic (Black and White image, in this case, the ORI) is "combined" with a low-resolution multispectral image (for example, SPOT 10m XS), to produce a multispectral high-resolution image. Some other common terms used for this process are resolution merge and image fusion.


SPOT 10m XS over Tawau, Sabah


SPOT 10m MS , zoom in

To further study the result of such image processing technique, a test case was conducted using a 1.25m resolution sample ORI over Tawau as the high-resolution panchromatic image. Several options were debated e.g. the low-resolution multispectral images. The final decision was made based on the principle that the multispectral image must be of reasonably low-cost, so that it will not introduce to much additional costs thus making the whole operation commercially not viable. SPOT 10m XS image was eventually used.

Commercial software ERDAS Imagine 9.1 was used, and the resolution merge with the multiplicative option was utilized. The result was quite impressive. Since this research was carried out mainly to make the ORI more visually appealing, not much effort was put to maintain the accuracy of the spectral value.


Pan-sharpened ORI, 1.25m




Pan-sharpened ORI, 1.25m - zoom in


With the Pan-sharpened ORI showing more promising potential in distinguishing features such as empty land versus grassland, roads versus traffic islands and median of roads, it has definitely improve the interpretation. Such a product not only provides an option to extract features, but also as a complementary product to be used in patching up cloudy areas of optical data given its cloud-free nature. This particular property of IFSAR ORI will definitely serve the market appropriately as cloud coverage is a constant "hindrance" to optical system operators working in this region.



Cloudy Scene - Quickbird Image 0.6m





Quickbird Image Patched with Pan-sharpened ORI - Cloud-free Image


Researched and written by: Kong Hin Yew

For further information, please contact us.

Friday, 31 July 2009

Official Release of Navcom's SF3050 GNSS Receiver


NavCom Technology, Inc., a leading pioneer in GPS technology and wholly-owned subsidiary of Deere & Company (NYSE:DE), officially announced on Friday 31/07/2009 the release of the SF-3050 multi-frequency GNSS receiver and its new Sapphire GNSS OEM board - two new products that offer integrated StarFire™/RTK GNSS capabilities.

As an authorized dealer of Navcom, we are pleased to announce the availability of SF3050 for immediate order. Terms and condition on shipping apply.

The SF3050 GNSS receiver is a unique, all in-a-box and fully upgradeable system. Users may initially purchase the receiver with only essential configuration to match their immediate requirement. The receiver can later be upgraded e.g. from a moderate accuracy single-frequency receiver to a a high accuracy multi-frequency receiver (or anything in between) with just software bundle upload, hence saving the need and expense of purchasing new receivers.

What's more, with the integration of StarFire global correction signal, the system can prove decimetre-level position accuracy, without a base station, anywhere in the world, any time. With the embedded RTK extend technology, the SF3050 will provide a robust cm-accuracy RTK solution at your work sites, boosting your field productivity and reducing frustration and stress due to radio signal outages.

Contact us for more informtion.




Wednesday, 24 June 2009

Comparison of SRTM data and IFSAR/NextMap Malaysia data



We did a comparison between the free 90m posting SRTM DEM data and the new 5m posting DSM data of IFSAR/NEXTmap Malaysia. The test data covers an area of 5km x 5km over a forested and rural area of Sabah. Both are surface data (i.e. DSM) .

The result is shown above in color shaded relief map as the subtraction (the diffrences in height/elevation in meters) between the two surfaces.

The relative accuracy of the two surfaces is about 24m at 95% confidence level. The relative vertical height diffrences between the two surfaces at some locations are as high as -56m and +54m. (i.e. extreme differences of over 100m).

We think the result provides useful guide to users who want to use 3 arc second SRTM DEM data for their terrain analysis and related works.

Acknowlegement: IFSAR data set contributed by Intermap Technology Inc



Thursday, 18 June 2009

Roadshow 2009

A successful event!


"Jurukur Perunding Launches 3 New Products" was successfully held on the 17 June 2009 at the Holiday Villa Subang, Selangor, Malaysia.





The response was overwhelming, with more than 120 participants turned up to witness the speakers' delivery of their interesting topics. Additional chairs had to be added to accommodate some last-minute participants.





Mr Sunny Lee, the Executive Director of JPSurveys briefed the audience on the technological path that the company has been taking to acquire the know how in the field of satellite imagery and remote sensing in the past, and he also set us the direction of the future. He said "we know the product is good when we see it", and the three products showcased during this event will definitely be our commitment.





Mr Max Chua of GEOEYE left an in-depth impression of GEOEYE, its products and services, the high resolution GEOEYE1 images as well as a glimpse of the next generation satellite being manufactured in US.



Mr Jan Schoderer of Intermap Technology is one person hard to be missed out on the day. He not only detailed the technical specifications of the IFSAR NextMap Malaysia product suite, but also touched on many sucessful applications in other parts of the world using IFSAT DTM, DSM and ORI.







During the tea break, participants were seen busy talking with the JPSurvey staffs manning the exhibition area, trying to look at some of the "Real Sample" of the GEOEYE1 0.5m resolution image over Port Klang, Malaysia. Many also gathered around the stall promoting the GOGOPAL PND, providing unchallenged navigation maps over the East and West Malaysia and Singapore. That was also the best time catching up with friends and associates, establishing new business contacts or merely to relax over a cup of coffee and light refreshment.



Mr Philip Morris of Navcom Technology apologized in his video for not being able to be present. However his material was deliberated by Mr Wong Yew Soon, GM of Mapping Division of JPSurveys in great details.





Mr Terence Tan's presentation had interestingly pointed out some issues faced by the oil palm estate and how high resolution imageries and other GIS techniques helped in tackling that.





Many satellite image users in the region would definitely know Mr Foo Weng Kee of SPOTASIA Singapore. He presented 89 slides covering a wide spectrum, inclusive of the operations of the ground station, insight of the distribution network of data and services, challenges faced, and new development in the earth observations vehicles.




It was not easy to be the last speaker of the day, especially so when the lunch is around the corner. JPSurveys Senior Project Manager, Mr Kong Hin Yew lived up to the challenge by giving a list down of the value-added services offered by JPSurveys to bridge the gap between what the data providers can produce and what the end users actually want. Special emphasis was given on two areas, namely the Orthorectification of images and the Pansharpening of Orthorectified Radar Image using SPOT 10m image.




A meeting would not be complete without someone leaving with a smiling face. Our Director Tn Haji Nordin B Sabran delivered a short but sweet thank-you note and gave away some lucky draw prizes. 2 USB Bluetooth Adaptors, 5 licenses of Global Mapper software and 1 GOGOPAL M38 PND were given out to some lucky winners. These were just tokens of appreciation to all those participants, many of whom are our loyal customers.





The crowd adjourned for lunch at the Chinese Restaurant. Delicious Dim Sum were served, and more small talks were observed between old friends and newly met. The whole event draw to a close at about 2 pm.

For more photographs of the event, click HERE!