tag:blogger.com,1999:blog-6659609247816106447.post1056693245033323211..comments2024-03-28T03:44:54.891+01:00Comments on GeoGarage blog: USS Guardian probe report evades key issues, raises more questionsgeogaragehttp://www.blogger.com/profile/15131510609947462613noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-6659609247816106447.post-85996007185429660702013-08-15T15:58:43.983+02:002013-08-15T15:58:43.983+02:00GMA News : USS Guardian relied on 'inaccurate&...<a href="http://www.gmanetwork.com/news/story/322016/scitech/technology/uss-guardian-relied-on-inaccurate-digital-maps-of-tubbataha-intel-agency" rel="nofollow">GMA News : USS Guardian relied on 'inaccurate' digital maps of Tubbataha - intel agency</a>Peiohttps://www.blogger.com/profile/15656222889479394661noreply@blogger.comtag:blogger.com,1999:blog-6659609247816106447.post-37508583260407194572013-08-15T15:45:36.977+02:002013-08-15T15:45:36.977+02:00Interaksyon : Tubbataha was off by 8 miles on USS ...<a href="http://www.interaksyon.com/article/68643/what-caused-the-grounding-of-uss-guardian-on-tubbataha-reef" rel="nofollow">Interaksyon : Tubbataha was off by 8 miles on USS Guardian's digital charts, says US mapping agency</a>Peiohttps://www.blogger.com/profile/15656222889479394661noreply@blogger.comtag:blogger.com,1999:blog-6659609247816106447.post-41766753911929918002013-08-06T12:44:18.801+02:002013-08-06T12:44:18.801+02:00Nextgov : How a misplaced reef on a digital chart ...<a href="http://www.nextgov.com/defense/2013/08/how-misplaced-reef-digital-chart-destroyed-navy-minesweeper/68126/" rel="nofollow">Nextgov : How a misplaced reef on a digital chart destroyed a Navy minesweeper</a>Peiohttps://www.blogger.com/profile/15656222889479394661noreply@blogger.comtag:blogger.com,1999:blog-6659609247816106447.post-83419004862544660692013-08-03T17:58:37.895+02:002013-08-03T17:58:37.895+02:00National Geospatial-Intelligence Agency re: Januar...<a href="http://www.governmentattic.org/8docs/NGAbauticalChtsReview_2013.pdf" rel="nofollow">National Geospatial-Intelligence Agency re: January 2013 review of Coastal Digital Nautical Charts, 2013</a><br />"<br />RE the USS Guardian, what did NGA's initial review entail?<br />What are we learning?<br />What is the fallout from the findings thus far?<br />If there is indeed erroneous data, how is that going to be fixed?<br /><br />Our review quickly determined that the primary issue in the misplacement of the Tubbataha Reef on the Coastal Digital Nautical Chart was related to LANDSAT-based commercial imagery.<br />Therefore, from January 17 through the morning of January 22, we examined and validated the accuracy of every situation in the Digital Nautical Chart where that type of data was used.<br />In total, NGA reviewed DNC charts that cover more than 116 million square nautical miles of ocean.<br />In that review, we identified only one issue of magnitude similar to the misplacement of the Tubbataha Reef.<br />This error, which appeared on both the paper chart and the Digital Nautical Chart, rotated the placement of the southern coast of Chile toward the sea; at its widest, the discrepancy was 7,000 meters.<br />In accordance with our standard procedures, NGA warned mariners to "navigate with caution"<br />in this area when the error was discovered on January 20.<br />A total of 25 chart areas - less than one percent of the total DNC holdings -- included inaccuracies that required additional scrutiny.<br />Only two of those - the Tubbataha Reef and the Chilean coast - were cause for concern.<br />The Tubbataha Reef chart correction has been completed and the patch is available for download now.<br />The correction to the Chilean charts is being worked with the highest priority.<br />The remaining issues do not pose risks to navigation and will be corrected via normal update cycles.<br />Ultimately, we found that the error related to the Tubbataha Reef was caused by a combination of factors.<br />Prior to 2008, the charts in use included a number of "phantom islands" - the charts indicated islands that did not exist.<br />In response to customer requests to address that problem, NGA used LANDSATderived<br />imagery to update the charts.<br />One of these images included incorrect information about the location of the section of ocean that includes the Tubbataha Reef.<br />As a result, the reef was incorrectly placed in the DNC.<br />That was the first factor.<br />The second was simply human error.<br />In 2011, NGA obtained survey data that corrected this positioning.<br />Due to a failure to follow established procedure, this correction was made in one portion of the DNC,<br />but not in another.<br />A single source of data is never ideal, and we use multiple sources to validate information wherever possible. As mentioned earlier, we continuously receive new and better information, from a number of sources.<br />As more information is available from more parts of the world, we will have fewer regions where only one source of information exists.<br />That will decrease the risk of errors like this one.<br />In addition, we are going to further review our production processes - including everything from procedures to training -- to determine whether they could be improved.<br />We are assembling a team of experts from across the maritime community to assist.<br /><br />First, it's important to note that NGA's safety of navigation products meet the International Hydrographic Organization {IHO) and the International Maritime Organization standards.<br />In addition,our production processes meet several external standards for process and quality control, including IS09001 Quality Management System.<br />Bottom line is that based on a careful review, we can now confirm that the error in the placement of the Tubbataha Reef in the Digital Nautical Chart was an exception, not a systemic problem.<br />And while no navigational aid is flawless, NGA is confident that the Digital Nautical Chart is safe for use in navigation.<br />"Peiohttps://www.blogger.com/profile/15656222889479394661noreply@blogger.comtag:blogger.com,1999:blog-6659609247816106447.post-47606199480786835472013-07-27T16:48:17.980+02:002013-07-27T16:48:17.980+02:00Breaking Defense : Untold Tale Behind USS Guardian...<a href="http://breakingdefense.com/2013/07/26/untold-tale-behind-uss-guardian-reef-grounding-flawed-nga-map-data/" rel="nofollow">Breaking Defense : Untold Tale Behind USS Guardian Reef Grounding: NGA’s Map Was Wrong By 8 Miles</a>Peiohttps://www.blogger.com/profile/15656222889479394661noreply@blogger.com