latrobe_1974jun01_air_vis_25cm_mga55

dataset: latrobe_1974jun01_air_vis_25cm_mga55.ecw
Abstract This project represents a timeslice series of historical aerial photography datasets around Warrnambool-Mepunga, Kingston, Latrobe Valley and Mallacoota 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). 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. To achieve the purpose, a time series of repeated aerial photography was planned with epoch intervals of approximately 10 years (and a minumum 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.
 
Citation proposal Citation proposal

latrobe_1974jun01_air_vis_25cm_mga55

Department of Transport and Planning
 

Description

Title
latrobe_1974jun01_air_vis_25cm_mga55 
Alternate title
latrobe_1974jun01_air_vis_25cm_mga55.ecw 
Resource Type
Dataset  
Supplemental Information
ANZVI0008107956 For non government state agencies the original photography can be accessed via the Landata website, https://www.landata.vic.gov.au/tpc_from_landataonline.aspx 
Status
complete  
 
 

Temporal

 
 

Spatial

Spatial representation type
Grid  
Horizontal Accuracy
1m  
Code
MGA 1994 Zone 55 
 

 

Maintenance

Maintenance and update frequency
complete  
 
 

Format

Title
ECW, TIFF 
 
 

Contacts

  Point of contact

Cited responsible party  

No information provided.
 
 

Keywords

Topic category
  • Elevation
  • Imagery base maps earth cover
 
 

Resource Constraints

Use limitation
State Government Use Only 
Classification
Restricted  
 
 

Lineage

Statement
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 Deliverables 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.Step 
Description
Orthorectified frames from scanned film numbers 2893, 2899, 2897, 2898, 2907. Reference flight charts are 8121N25, 8121S20, 8221N13, 8221S09. Lens used is UAg298. 
 
 

Metadata Constraints

Use limitation
State Government Use Only 
Classification
Unclassified  
 
 

Quality

Attribute Quality
Positional Accuracy
Comments
±1m RMSE (68%) 
Conceptual Consistency
Missing Data
Excess Data
 
 

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  Associated resources

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