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HYPACK softwareApril 27, 2005
Article by Jerry Knisley
Engineering and Water Resources recently purchased the HYPACK software to conduct hydrographic surveys in the Stuart Florida area. The planned use of the software is to assist in developing the marine products that they can offer.
Training was conducted this week in Stuart, Florida. The equipment used includes an RTK GPS from Ashtec and a sonar from SonarLite. The initial day was spent trying to get the RTK GPS to get a good solution. This took quite a while and on subsequent days we discovered that to get RTK to work, we initialized the base station and let it run until it lost all of its satellites. Then restarting the base station seemed to work. This happened three days in a row. It could be that we were missing a step somewhere and this little work around fixed the problem.
Once we did get the RTK to work we found that the Geoid model was already installed in the RTK units so, by placing a Geoid model in HYPACK® Geodetic Parameters our tide was off by roughly -100 feet. We took the Geoid model out of HYPACK®, then the tide was off by 15 feet. We entered the antenna height decreased the error to 4.02 meters. It turned out that the height of the RTK Base station was entered in Feet and should have been in Meters. When this was changed in the Base Station the tide was right on.
On the first day, a test survey was conducted in a minor canal area and taken through to editing and contour generation using TIN Model.
The image (below) is of the channel on an aerial photo.
(There was a "Beware of alligators" sign at the boat landing. I have to talk to Pat. Maybe we need an employee training class in alligator wrestling!)
Day two was spent surveying and editing the Frasier Creek area where a dredge contract was recently conducted. The RTK was calibrated to provide soundings in relation to Mean Sea Level. This survey took most of the morning but produced excellent contours of the area. The last day we mapped a sailboat anchorage at Peck Lake.
The second day's survey at Frasier Creek.
Peck Lake sailboat anchorage
Engineering and Water Resources recently purchased the HYPACK software to conduct hydrographic surveys in the Stuart Florida area. The planned use of the software is to assist in developing the marine products that they can offer.
Training was conducted this week in Stuart, Florida. The equipment used includes an RTK GPS from Ashtec and a sonar from SonarLite. The initial day was spent trying to get the RTK GPS to get a good solution. This took quite a while and on subsequent days we discovered that to get RTK to work, we initialized the base station and let it run until it lost all of its satellites. Then restarting the base station seemed to work. This happened three days in a row. It could be that we were missing a step somewhere and this little work around fixed the problem.
Once we did get the RTK to work we found that the Geoid model was already installed in the RTK units so, by placing a Geoid model in HYPACK® Geodetic Parameters our tide was off by roughly -100 feet. We took the Geoid model out of HYPACK®, then the tide was off by 15 feet. We entered the antenna height decreased the error to 4.02 meters. It turned out that the height of the RTK Base station was entered in Feet and should have been in Meters. When this was changed in the Base Station the tide was right on.
On the first day, a test survey was conducted in a minor canal area and taken through to editing and contour generation using TIN Model.
The image (below) is of the channel on an aerial photo.
(There was a "Beware of alligators" sign at the boat landing. I have to talk to Pat. Maybe we need an employee training class in alligator wrestling!)
Day two was spent surveying and editing the Frasier Creek area where a dredge contract was recently conducted. The RTK was calibrated to provide soundings in relation to Mean Sea Level. This survey took most of the morning but produced excellent contours of the area. The last day we mapped a sailboat anchorage at Peck Lake.
The second day's survey at Frasier Creek.
Peck Lake sailboat anchorage
