Aerial photography of intertidal zone (a.k.a. "Aerial Photography - WRAPS (2002)" – EW metadata sheet is DOCS#791783)

The intertidal zone around the Waikato Region's coastline was flown and aerially photographed in 2001-2002. These aerial photographs are used to map habitats and identify areas of high biodiversity. Further details are given below: Colour digital orthophotography covering the Waikato region. The aerial photography was flown between October 2001 (most of the region flown in 2001/02 summer) and October 2002 (Coromandel, Taupo). The digital orthophotography is referenced to the New Zealand Transverse Mercator projection with the NZGD2000 datum. The digital orthophotos are designed to be used at a maximum scale of 1:5000. Members of the Consortium, to be known as Waikato Aerial Photography Syndicate (WRAPS) 2001, are as listed: Department of Conservation (Waikato Conservancy), Franklin District Council, Hauraki District Council, Matamata Piako District Council, Otorohanga District Council, South Waikato District Council, Thames Coromandel District Council, University of Waikato, Waikato District Council, Waikato Regional Council, Waipa District Council, Waitomo District Council. Purpose: Describe/map habitats and identify areas of high biodiversity.

The complete dataset contains 3251 digital orthophoto tiles covering the entire Waikato Region. There are 224 tiles covering all estuaries on the Waikato Region's coastline, including: Otahu Estuary Whangamata Harbour Wharekawa Harbour Tairua Harbour Purangi Estuary Whitianga Harbour Whangapoua Harbour Kennedy Bay Waikawau Bay and Estuary Port Charles Stony Bay Waiaro Estuary Colville Bay Coromandel Harbour Te Kouma Harbour Manaia Harbour Waikato River Mouth and Estuary Raglan Harbour Aotea Harbour Kawhia Harbour Marakopa River Mouth Awakino River Mouth Mokau River Mouth The photos were taken within one hour of low tide. More detail is available in EW DOCS# 791783 on the complete WRAPS dataset.

Waikato Regional Council land boundary with coverage of estuaries and overlap into inshore coastal waters.

Otahu Estuary 2765501E 6437360N Whangamata Harbour 2765491E 6441114N Wharekawa Harbour 2766551E 6450452N Tairua Harbour 2764392E 6462023N Purangi Estuary 2756573E 6481062N Whitianga Harbour 2752048E 6481187N Whangapoua Harbour 2744941E 6493029N Kennedy Bay 2738762E 6500761N Waikawau Bay and Estuary 2735785E 6508963N Port Charles 2732301E 6508963N Stony Bay 2727569E 6518164N Waiaro Estuary 2727042E 6509426N Colville Bay 2730897E 6505782N Coromandel Harbour 2733500E 6487752N Te Kouma Harbour 2729498E 6482874N Manaia Harbour 2730098E 6481082N Waikato River Mouth and Estuary 2661655E 6424395N Raglan Harbour 2677891E 6424395N Aotea Harbour 2672815E 6356838N Kawhia Harbour 2673090E 6345057N Marakopa River Mouth 2660467E 6321181N Awakino River Mouth 2651226E 6281174N Mokau River Mouth 2650931E 6276461N

The aerial photography was flown between October 2001 (most of the region flown in 2001/02 summer) and October 2002 (Coromandel, Taupo).

The 24 bit colour aerial photography was flown at 20,000 feet with zero cloud cover and a sun angle of >= 40 degrees. A LH Systems RC 30 camera with 152 mm focal length was used. These specifications produced a contact print scale of 1:40,000. The aerial photographs were scanned at 12.5 µm (0.5 metre resolution) then resampled to 1.0 metre final resolution. Each image was corrected for lens distortion, image tilt and terrain distortion by using a high order photogrammetric orthophoto process. Each digital orthophotograph covers an area of 2,400 m EW and 3,600 m NS. The digital orthophotographs are feather mosaiced to allow the generation of an image mosaic. The digital orthophotographs were supplied to Environment Waikato as georeferenced TIFF files. The raw tiffs were converted to jpeg format by Environment Waikato for improved performance in Geomedia. Each digital orthophoto tile has seven internal overviews. The WRAPS digital orthophoto tile naming convention (BD33_0102.tif) is based on the NZTM naming convention, that is nztmsheetnumber_rownumbercolumnnumber.extension. Frequency of collection: This dataset is a snapshot in time between October 2001 and October 2002. It complements the WRAPS 1992 dataset (DOC # 615123). Environment Waikato and/or WRAPS may update the dataset in the future.

Data quality: There have been four types of checks on the digital orthophotography supplied so far. 1) Settings Check: confirmed that the digital orthophotography was supplied with the agreed settings (contrast, colour etc). 2) Quality Standards Check: a random sample of 20 digital orthophotographs was checked against the quality standards as stated in Section E, Appendix 2 of the Professional Services Contract (consistent radiometry, foreign artefacts/scratches etc). The sample conformed to the standards. 3) Accuracy Check: the Contract states that horizontal accuracy of the digital orthophotography is to be +/- 3.0 metres at 90% confidence. Terralink have provided samples of the differences between their GPS control points and the same points on the digital orthophotography. These samples meet the specification. 4) Independent Accuracy Check: 18 sample points were chosen that could be resolved to +/- 1.0 metre (+/- 1 pixel) on the digital orthophotography. The points were spatially distributed over 1300 km2 between 10 and 80 metres above sea level and were located in both urban and rural areas of varying land cover classes. These points were positioned with a differential GPS. All sample points were within 3.0 metres of their GPS 'real world' location (0.02 m to 2.53 m) with an average difference of 0.72 metres. Attribute accuracy: N/A Completeness: The digital orthophotography is complete for the Waikato Region.

Digital orthophotography is held by Environment Waikato in both soft and hard copy formats (when printed). Digital Format: The digital orthophotography is supplied as 24 bit colour georeferenced TIFF image files. Each image has an internal tile size of 2400 columns x 3600 rows of pixels. The digital orthophotography is also available in two compressed formats, MrSID (10 times compression) and JPEG (approximately 10 times compression). The JPEG images contain 7 internal overviews and are designed to be viewed in Intergraph's Geomedia software.

Locate areas that need further protection and/or management. The digital orthophotography is designed to either provide a backdrop or be used for analyses in any spatial viewing system. It provides a photographic record of the geographic area at the time the aerial photography was obtained. It also acts as a 'moment in time' record of the land cover and land use. The digital orthophotography can have GIS vector data overlays, be draped over a DTM in 3-D software and can be exported to other windows applications such as Word and PowerPoint.

Terralink's guiding principle with regard to the WRAPS imagery states; "The WRAPS images are to be managed and made available by WRAPS members in such a way that no-one is able to download, copy and sell images to any third party that Terralink could otherwise have reasonably be expected to have an opportunity to sell the images to." In essence, Terralink agrees to WRAPS members using the images for the purposes of doing their normal business, including electronic documents and on the Internet, with the proviso that; the original images at source resolution are to be limited to one square kilometer in digital format (this does not apply to digital transactions between WRAPS members as they already have the source data) areas larger than one square kilometer may be used in digital format as long as the resolution of the image is downgraded to a resolution of 300 DPI. WRAPS members are to check with Terralink if there is any uncertainty for specific releases of image data. A set of 1:40,000 contact prints (30% overlap) are held at Environment Waikato on behalf of WRAPS members. A DTM with a planar accuracy of +/- 3.0 metres and a vertical accuracy of +/- 6.0 metres at 90% confidence is available for purchase from Terralink International Limited. Environment Waikato has not purchased the DTM. Sensitivity/Confidentiality: The digital orthophotography, aerial photography and digital terrain model (DTM) are owned and copyrighted by Terralink International Limited. Environment Waikato is licensed to use this imagery (the digital orthophotography and contact prints and DTM if purchased) for the purposes of doing business. The copyright statement "Imagery sourced from Terralink International Limited" must be used with the WRAPS 2002 imagery. WRAPS images published on the world wide web or included in any electronic documents that are sent external to Environment Waikato are considered "digital" data and are subject to "supply of digital data to third parties" restrictions. Images showing an area greater than 1 km2 cannot be published on the internet or an extranet (but can be used on an intranet), nor can they be included in any electronic format that is available external to Environment Waikato. More detail is available in EW DOCS# 791783 on the copyright agreement for the complete WRAPS dataset.

This dataset is a snapshot in time between October 2001 and October 2002. It complements the WRAPS 1992 dataset (DOC # 615123). Environment Waikato and/or WRAPS may update the dataset in the future.