port-phillip-coastline_1940jan01_air_bw_50cm_mga55
dataset:
port-phillip-coastline_1940jan01_air_bw_50cm_mga55
Abstract - adjust the year of representation. This project represents a timeslice series of historical aerial photography datasets around the Port Phillip Bay Coast from the 1930's to the 1990's. This dataset represents the 1940's timeslice.
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Citation proposal Citation proposal
port-phillip-coastline_1940jan01_air_bw_50cm_mga55 Department of Transport and Planning - https://metashare.maps.vic.gov.au/geonetwork/srv/eng/catalog.search#/metadata/5916e451-9723-5777-815d-e8b30a1cdef4 |
- Description
- Temporal
- Spatial
- Maintenance
- Format
- Contacts
- Keywords
- Resource Constraints
- Lineage
- Metadata Constraints
- Quality
- Acquisition Info
- Raster Data Details
- Raster Type Details
- Point Cloud Data Details
- Contour Data Details
- Survey Details
Simple
Description
- Title
- port-phillip-coastline_1940jan01_air_bw_50cm_mga55
- Alternate title
- port-phillip-coastline_1940jan01_air_bw_50cm_mga55
- Purpose
- This project represents a timeslice series of historical aerial photography datasets around the Port Phillip Bay Coast from the 1930's to the 1990's. The purpose of creating the ortho photo mosaics was to detect and measure changes (long term, progressive or cyclic) along the Port Phillip Bay shoreline. The type of shoreline change the photography aimed to identify included sandy beach-dune, scarped 'soft-rock', muddy mangrove shores and asset removal/construction. A secondary purpose of the photography was to map the change of vegetation along the seaward side of the bay. To achieve the purpose, a time series of repeated aerial photography was planned with epoch intervals of approximately 10 years (and a minimum of five years separation). The seven epochs planned for were 1930's,1940's,1950's,1960's,1970's, 1980's and 1990's. For any given epoch where the study area was not covered completely by a historic photography project (series of air-photos taken on the same date or within a few days of each other) then the next most recent photography project was identified, processed and used for comparison. The aim was to keep each epoch as close as possible. This data is only available for Whole of Victorian Government use.
- Supplemental Information
- ANZVI0008107734
Temporal
Spatial
- Code
- MGA Zone 55 GDA94
Maintenance
- Maintenance and update frequency
Format
- Title
- ECW,TIFF
Contacts
Point of contact
Department of Transport and Planning
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Coordinated Imagery Program
PO Box 500
East Melbourne
Victoria
3002
Australia
Point of contact
Cited responsible party
No information provided.
Keywords
- Topic category
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- Imagery base maps earth cover
- DELWP Categories
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- Imagery & Base Maps
Resource Constraints
- Use limitation
- Unknown
- Classification
- unknown
Lineage
- Statement
- The following steps were undertaken to produce the ortho-photo mosaic datasets. Step 1 DEM production – placing contours over supplied DEM to check for distortions and correct where necessary. Primary aim to provide accurate orthophoto images, not a precision elevation data set. Step 2 Control selection from modern photography to ensure points able to be seen on selected historical images Step 3 Aerial triangulation - Automatic point measurement and bundle adjustment using Metashape Step 4 Rectification - Produce Orthophotos using Leica XPro RectifierTM Step 5 Colour balance imagery Step 6 Match joins – Produce Orthophoto using either Leica LPS and ERDAS ImagineTM / ER MapperTM Step 7 Deliverable’s Create outputs as per specifications The source photography and selection of frames was made for each mosaic based on similarity of scale, capture dates, best image clarity available and epoch representation. The source frame photography (in digital format) was previously scanned from analog film negatives scanned at 12um or 15um or, scanned from photography prints at 800dpi. The production order of the ortho-photo mosaics was generally from the most recent to oldest imagery (i.e 1990’s working back to the 1930’s). Modern imagery (within 10 years of 2018) of high accuracy and high detail was used as control as well as image control and verification points with the previously produced image epoch.
Metadata Constraints
- Use limitation
- State Government use only.
- Classification
- Limited Distribution
Quality
Attribute Quality
Positional Accuracy
- Comments
- ±2.5m RMSE (68%)
Conceptual Consistency
Missing Data
Excess Data
Acquisition Info
- Platform Type
- Aerial
- Assembly
- Mosaic
- Tile Size
- 1 km
Raster Data Details
- Raster Type
- Aerial Photo
- X Pixel Resolution (cm)
- 50cm
- Y Pixel Resolution (cm)
- 50cm
- Seamlessness
- Partial
- Number of Bands
- 3
- Band List
- 1,2,3
- Resampling Kernel
- Unknown
- Rectification Type
- Orthorectified
- Platform Name
- Fixed Wing Aircraft
Point Cloud Data Details
Contour Data Details
Survey Details
Aerial Survey Details
- Run Orientation
- Not Entered
- Flying Height Unit
- Not Entered
Overviews
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5916e451-9723-5777-815d-e8b30a1cdef4
Access to the portal Access to the portal
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Associated resources
Not available