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.
 
Citation proposal Citation proposal

port-phillip-coastline_1940jan01_air_bw_50cm_mga55

Department of Transport and Planning - 
 

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

  Point of contact

Cited responsible party  

No information provided.
 
 

Keywords

Topic category
  • Imagery base maps earth cover
DELWP Categories
  • 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

  Provided by

  Share on social sites

         

  Views Views

Read here the full details and access to the data. Read here the full details and access to the data.

  Associated resources

Not available