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Bathymetry - Discovery Marine - Lower Waikato
| File ID: |
14205764-632E-458D-966A-281A8739C1FF |
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| Hierarchy Level: |
dataset |
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| Abstract: |
Bathymetry survey of the Lower Waikato River (delta and estuary area) by Discovery Marine Ltd in June 2013. |
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| Statement: |
This area was surveyed between 10-28 June 2013 and encompassed all waters with the Port Waikato River entrance, upstream to vicinity of The Elbow landing. All main channels, waterways and
streams were surveyed throughout the delta region. |
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| Keywords: |
Bathymetry,Depth,Elevation,Estuaries,River,Survey |
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| Topic Category: |
elevation:height above or below sea level |
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| Resource Reference Date: |
28/06/2013 |
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| Metadata URL: |
https://data.waikatoregion.govt.nz:8443/ords/f?p=140:12:0::NO::P12_METADATA_ID:3088 |
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Responsible Parties
| Role: |
owner |
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| Position: |
Team Leader Spatial Information and Data Management |
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| Organisation: |
Waikato Regional Council |
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| Delivery Point: |
160 Ward Street |
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| City: |
Hamilton Central |
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| Postal Code: |
3204 |
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| Country: |
New Zealand |
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| Phone: |
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| Fax: |
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| Email: |
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| Role: |
resourceProvider |
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| Position: |
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| Organisation: |
Discovery Marine Limited |
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| Delivery Point: |
42B Tawa Street |
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| City: |
Mount Maunganui |
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| Postal Code: |
3116 |
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| Country: |
New Zealand |
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| Phone: |
0800 365 787 |
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| Fax: |
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| Email: |
info@dmlsurveys.co.nz |
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Metadata
| Language: |
English |
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| Character Set: |
utf8 |
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| Standard: |
ANZLIC |
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| Standard Version: |
1.1 |
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Metadata Constraints
| Access Constraints: |
copyright |
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| Use Constraints: |
copyright |
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Download Links
Supporting Information Links
General Notes:
2013 Bathymetry ASCII xyz
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| File Identifier: |
546BE7C2-3201-42B3-A101-258A0A1C4BE4 |
Parent Identifier: |
14205764-632E-458D-966A-281A8739C1FF |
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| Hierarchy Level: |
feature |
Hierarchy Level Name: | feature of Bathymetry - Discovery Marine - Lower Waikato |
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| Abstract: |
"As supplied" ASCII xyz file with the extension .pts. |
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| Statement: |
Raw survey data was reduced for tide and thinned to 1m spacing by the suppliers. |
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| Other Information: |
A mixture of weather conditions were experienced throughout the survey period. The downstream region at Port Waikato could only be surveyed in light wind conditions due to issues with surface chop. Within the delta region, boat sounding could be undertaken in most weather conditions being relatively sheltered. Sounding was predominately undertaken over high water periods due to generally shallow depths throughout the lower reaches.
DMLs 5.3m Stabicraft inshore survey vessel was the primary survey vessel used for the survey. The boat is fitted with a full digital survey system with all data logged using Trimble HydroPro acquisition software. A large Jet Ski, converted for surveying operations was also used which improved the speed of data collection. The Jet Ski was fitted with a similar set of survey equipment to the survey boat and could access very shallow areas not suitable for the boat.
A Trimble R6 RTK GPS system was used for vessel positioning with a horizontal accuracy of better than +/-0.1m. On each day of boat sounding, the RTK Base Station was erected over known survey marks, being existing LINZ survey marks or newly established marks by DML.
A Tritech PA500 digital sounder operating on 500 kHz frequency was used on both survey platforms. This is a high frequency narrow beam width sounder with a rated accuracy of +/-1cm. The echo sounders were calibrated prior to the survey.
Soundings were reduced for tide using RTK GPS derived measurements. A tide gauge was also installed at the Port Waikato Wharf as a further check on tide levels. Tidal curves were derived from the RTK measurements and referred to Auckland Vertical Datum (AVD) for the data collection stage, since the measurements are derived from a local survey network in terms of AVD. However, final data has been converted to Moturiki Vertical Datum (MVD) using a known conversion factor promulgated by LINZ. For the survey region, a value of -0.1m has been used to convert from AVD to MVD.
A supplied 2D bathymetry image illustrates the sounding coverage and line direction/spacing. Throughout the main body of water in vicinity of Port Waikato, lines of sounding were generally run perpendicular to seabed contours at between 50-100m line spacing. Within the delta region amongst the islands, sounding line density was increased to 25-50m spacing. In addition to conventional line sets, some channels and streams were surveyed using a zigzag pattern when practical to do so. Every attempt was made to echo sound all waterways, including the smaller streams and tributaries, however there were some minor streams that could not be accessed by either survey vessel due to extremely thick weed.
Raw survey data was reduced for tide and then exported into Terramodel processing software for database checks and management. Surfer8 Terrain modelling software to generate the accompanying 2D Image. A preliminary depth dataset (ASCII XYZ) of cleaned data thinned to 1m spacing has been compiled. If required by the Client, gridding of the data can be undertaken for modelling requirements.
Based on comparison of overlapping soundings, the accuracy of depths for this survey is assessed as +/-0.20m or better.
Noting the limitations with shallow depths and access to weed laden waterways, it is believed that excellent coverage has been achieved throughout the designated survey area.
The Bathymetry Data has been commissioned by Waikato Regional Council. Copyright in this data, and associated products derived from this data is vested wholly with Waikato Regional Council. Waikato Regional Council has full and unconditional rights to use, copy, disclose, distribute and market this data and associated products. WRC, at its discretion, may charge for access to or extraction of this data at a Technical Officer rate of $140 per hour plus GST. Bathymetry Data is available under the Creative Commons Attribution 4.0 International license (CC BY 4.0). |
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| Keywords: |
Bathymetry,Depth,Elevation,Estuaries,River,Survey |
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| Topic Category: |
elevation:height above or below sea level |
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| Resource Reference Date: |
28/06/2013 |
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Metadata Constraints
| Access Constraints: |
copyright |
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| Use Constraints: |
copyright |
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Maintenance Information
| Maintenance frequency: |
notPlanned |
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| Last Load Date: |
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Spatial Representation Information
| Recommended Scale: |
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| Reference System: |
EPSG2193 |
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| Spatial Representation Type: |
grid |
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| Vector | Grid | Geographic Bounding Box |
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| GeometricObjectType : |
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| geometricObjectCount : |
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| topologyLevel : |
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| Number of Dimensions : |
3 |
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| Cell Geometry : |
point |
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| Transformation Param Available : |
N |
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| westBoundLongitude : |
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| eastBoundLongitude : |
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| southBoundLatitude : |
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| northBoundLatitude : |
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Responsible Parties
| Role: |
owner |
| Position: |
GIS and Data Management Team Leader |
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| Organisation: |
Waikato Regional Council |
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| Delivery Point: |
160 Ward Street |
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| City: |
Hamilton Central |
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| Postal Code: |
3204 |
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| Country: |
New Zealand |
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| Phone: |
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| Fax: |
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| Email: |
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Data Constraints
| Data Access Constraints : |
copyright |
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| Data Use Constraints: |
copyright |
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| Data Distribution: |
Unrestricted |
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| Licence Type : |
CC BY 4.0 |
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| Licence: |
https://creativecommons.org/licenses/by/4.0 |
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| Licence Expiry: |
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| Licence Conditions: |
WRC paid for, and owns, the data. Contract RIG 439 (DM#2486995) states "services intellectual property will be owned by Council". |
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| Copyright : |
This work is licensed under a Creative Commons Attribution 4.0 International License © Waikato Regional Council & Discovery Marine Ltd. Bathymetry - Lower Waikato 2013. Licensed under CC BY 4.0. |
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| Data Disclaimers : |
The standard Waikato Regional Council Disclaimer applies to this data “While Waikato Regional Council has exercised all reasonable skill and care in controlling the contents of this information, Waikato Regional Council accepts no liability in contract, tort or otherwise howsoever, for any loss, damage, injury or expense (whether direct, indirect or consequential) arising out of the provision of this information or its use by you.” |
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| Data Use Limits : |
Data was collected for hydrodynamic modelling, not for navigational purposes. |
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Download Links
Supporting Information Links
General Notes:
WRC# 3119139 - Lower Waikato River estuary DML bathymetry survey report July 2013
Attribute Information
| Name | Description | Notes | Restricted | Primary Key |
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| ID |
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N |
N |
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