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
 

Details

Contacts

Cited responsible party  

No information provided.

  Point of contact

 

Identifiers and Keywords

Topic category
  • Elevation
  • Imagery base maps earth cover
 

Resource Constraints

Use limitation
State Government Use Only 
Classification
Restricted  
 

Other Dataset Details

Status
complete  
Format
ECW, TIFF 
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 
Maintenance and update frequency
complete  
 

Spatial

Spatial representation type
Grid  
Reference system identifier
MGA 1994 Zone 55

 

Resolution

Horizontal Accuracy
1m  
Vertical Accuracy
1m  
Row Resolution
25cm  
Column Resolution
25cm  
 

Quality

Positional Accuracy
±1m RMSE (68%) 
 

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 
 

Acquisition Date

Begin date
1974-06-01 
End date
1974-06-01 
 

Acquisition Data (Common)

Status
complete  
Assembly
Mosaic  
Tile Size
1 km  

gco:Real

No information provided.
 

Raster Details

Number of Bands
3 
Platform Name
Fixed Wing Aircraft  
Seamlessness
Partial  
Rectification Type
Orthorectified  
Rectification Notes
Orthorectified frames from scanned film numbers 2893, 2899, 2897, 2898, 2907. Reference flight charts are 8121N25, 8121S20, 8221N13, 8221S09. Lens used is UAg298. 
 

Aerial Photo Details

Photo Type
Analog  
Film Number
2893, 2899, 2897, 2898, 2907 
 

Aerial Survey Details

Runs
10 
Run Orientation
E-W  
Side Overlap
40 
Forward Overlap
60 
Flying Height Unit
agl feet  
Flight Height
7800 
 

About the Metadata Record

Metadata identifier
urn:uuid / 7fe896a5-cb6a-45bd-b55e-ba95f24e4588

  Processor

Contact  

No information provided.
Resource Type
Dataset  
Date info ( Creation )
2023-09-12T10:10:20
Date info ( Revision )
2023-09-12T10:24:44
Standard Name
ISO 19115-3:2018 
Profile Name
DELWP Profile 
Profile Version
Version 1 
Profile Date
2019-05-24  
 

Metadata Constraints

Use limitation
State Government Use Only 
Classification
Unclassified  
 
 

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  Associated resources

Not available